3
The Mathematics of Liquid Crystals
http://sms.cam.ac.uk/collection/1383776
Liquid crystals have a multitude of applications, notably those in flat panel display technology, which has fundamentally impacted modern life. From a theoretical point of view, liquid crystals offer a unique opportunity for the study of partial order, as complex liquid crystal phases represent the most wellorganised known states of soft matter.
Read more at: http://www.newton.ac.uk/programmes/MLC/
1440
2013
Mon, 15 Jul 2013 13:51:04 +0100
Thu, 10 Jan 2013 17:26:48 +0000
en
smssupport@ucs.cam.ac.uk
The Mathematics of Liquid Crystals
http://sms.cam.ac.uk/collection/1383776
http://rss.sms.cam.ac.uk/itunesimage/1394301.jpg
http://video.search.yahoo.com/mrss
The Mathematics of Liquid Crystals
Liquid crystals have a multitude of applications, notably those in flat panel display technology, which has fundamentally impacted modern life. From a theoretical point of view, liquid crystals offer a unique opportunity for the study of partial order, as complex liquid crystal phases represent the most wellorganised known states of soft matter.
Read more at: http://www.newton.ac.uk/programmes/MLC/
The Mathematics of Liquid Crystals
Liquid crystals have a multitude of applications, notably those in flat panel display technology, which has fundamentally impacted modern life. From a theoretical point of view, liquid crystals offer a unique opportunity for the study of partial order, as complex liquid crystal phases represent the most wellorganised known states of soft matter.
Read more at: http://www.newton.ac.uk/programmes/MLC/
Cambridge University
Steve Greenham
http://sms.cam.ac.uk/collection/1383776
The Mathematics of Liquid Crystals
20130110T17:26:48+00:00
INIMS
101092
no

Active liquid crystals and the origins of cellular locomotion
ucs_sms_1383776_1442261
http://sms.cam.ac.uk/media/1442261
Active liquid crystals and the origins of cellular locomotion
Cates, M (University of Edinburgh)
Monday 18 March 2013, 14:0014:50
Tue, 19 Mar 2013 11:17:26 +0000
Isaac Newton Institute
Cates, M
86ba915ca91f8d6380f56ef834a9b889
5c855217c36643d4b972ea08367936f5
d98c75f9ea1132686a7e5cacbab408ff
fd2d11f196959e65f8ef8b9c7f8c18e6
Cates, M (University of Edinburgh)
Monday 18 March 2013, 14:0014:50
Cates, M (University of Edinburgh)
Monday 18 March 2013, 14:0014:50
Cambridge University
3048
http://sms.cam.ac.uk/media/1442261
Active liquid crystals and the origins of cellular locomotion
Cates, M (University of Edinburgh)
Monday 18 March 2013, 14:0014:50
I will report theory and simulations of the continuum equations for a droplet of active polar liquid crystal. These equations offers a simple representation of a "cell extract", such a droplet of actomyosin solution, in which myosin motors moving on actin filaments create internal stresses as a result of biological activity. (This system can in turn be viewed as a strippeddown representation of the cytoskeleton which causes locomotion of eukarotic cells.) Actomyosin is an active liquid crystal whose polarity describes the mean sense of alignment of actin fibres. In the absence of polymerization and depolymerization processes (`treadmilling') which arise respectively at the plus and minus ends of the filaments, the active dynamics should be unchanged when polarity is reversed. Our results suggest that, contrary to most literature opinion, locomotion can arise in the absence of treadmilling, by spontaneous symmetry breaking (SSB) of polarity inversion symmetry.
20130319T11:17:49+00:00
3048
1442261
true
16x9
false
no

Active Nematics
ucs_sms_1383776_1507568
http://sms.cam.ac.uk/media/1507568
Active Nematics
Yeomans, J (University of Oxford)
Tuesday 25 June 2013, 14:0014:45
Fri, 28 Jun 2013 15:34:42 +0100
Isaac Newton Institute
Yeomans, J
25934dc29932e23373c2884c12ccb9bf
9123f6944e9eebc49055d474eff6d05f
86083c8e7347fc2277da38e3a1736e23
613523f5af1c11d647e3f24a905394d5
Yeomans, J (University of Oxford)
Tuesday 25 June 2013, 14:0014:45
Yeomans, J (University of Oxford)
Tuesday 25 June 2013, 14:0014:45
Cambridge University
2680
http://sms.cam.ac.uk/media/1507568
Active Nematics
Yeomans, J (University of Oxford)
Tuesday 25 June 2013, 14:0014:45
Active systems, such as the cytoskeleton and bacterial suspensions, provide their own energy and hence operate out of thermodynamic equilibrium. Continuum models describing active systems are closely related to those describing liquid crystal hydrodynamics, together with an additional ‘active’ stress term. We discuss how the behaviour of the active continuum models depends on model parameters, such as the strength of the activity and the liquid crystal tumbling parameter, and we compare our results to recent experiments on cytoskeletal gels.
20130628T17:53:41+01:00
2680
1507568
true
16x9
false
no

An interview with Jerry Ericksen
ucs_sms_1383776_1486552
http://sms.cam.ac.uk/media/1486552
An interview with Jerry Ericksen
Professor Jerry Ericksen interviewed by John Ball as part of the Isaac Newton Institute research programme on the Mathematics of Liquid Crystals
Tue, 28 May 2013 09:38:19 +0100
Jerry Ericksen
John Ball
Steve Greenham
Isaac Newton Institute
Isaac Newton Institute
c79578688cf4448d0a216d712e830b44
a083833253ccea15862ebd361437a757
d7cbad18f3d9da3ad2328de79e609b6f
1615e0312afb5418fdaa0e60ba2cdced
Professor Jerry Ericksen interviewed by John Ball as part of the Isaac Newton...
Professor Jerry Ericksen interviewed by John Ball as part of the Isaac Newton Institute research programme on the Mathematics of Liquid Crystals
Cambridge University
3014
http://sms.cam.ac.uk/media/1486552
An interview with Jerry Ericksen
Professor Jerry Ericksen interviewed by John Ball as part of the Isaac Newton Institute research programme on the Mathematics of Liquid Crystals
20130528T09:38:55+01:00
3014
1486552
true
16x9
false
no

An inverse problem arising from polarimetric measurements of nematic liquid crystals
ucs_sms_1383776_1469389
http://sms.cam.ac.uk/media/1469389
An inverse problem arising from polarimetric measurements of nematic liquid crystals
Capdeboscq, Y (University of Oxford)
Wednesday 10 April 2013, 09:0010:00
Fri, 26 Apr 2013 11:18:01 +0100
Isaac Newton Institute
Capdeboscq, Y
463562100934c165b13d14161b942489
910120147756c31c10d776dcabd00a90
04038e73f87c21f600fcb3de10d05a39
0473ffd8fe86ec732386ae5cb9e9d727
Capdeboscq, Y (University of Oxford)
Wednesday 10 April 2013, 09:0010:00
Capdeboscq, Y (University of Oxford)
Wednesday 10 April 2013, 09:0010:00
Cambridge University
3205
http://sms.cam.ac.uk/media/1469389
An inverse problem arising from polarimetric measurements of nematic liquid crystals
Capdeboscq, Y (University of Oxford)
Wednesday 10 April 2013, 09:0010:00
This work is motivated by a polarimetric experiment (performed in HP Labs) were a thin slab of nematic liquid crystal was placed on a cylindrical mount, and illuminated by a focused polarized laser beam. As the slab is rotated and the polarimetric measurement data (the socalled Stokes parameters) varies with the angle of incidence. The object of this work was to determine what information on the dielectric permittivity of the liquid crystal could be retrieved from this data.
20130426T11:18:28+01:00
3205
1469389
true
4x3
false
no

An Overview of the OseenFrank elastic model and some symmetry aspects of the Straley MeanField model for Biaxial Nematic liquid crystals
ucs_sms_1383776_1384249
http://sms.cam.ac.uk/media/1384249
An Overview of the OseenFrank elastic model and some symmetry aspects of the Straley MeanField model for Biaxial Nematic liquid crystals
Gartland Jr., EC (Kent State University)
Tuesday 08 January 2013, 09:0009:40
Fri, 11 Jan 2013 13:14:56 +0000
Isaac Newton Institute
Gartland Jr., EC
3efb1f55ead6e8f7124776d81ae8ae25
25df9662b63eae6768d970e2cbd57165
87c2d1ecc4a06c3f54bf9c586d79b5a0
0f35d6efbd1a06d97e5ecc4b964849e4
99dda066672262ae12f5169723358e7b
Gartland Jr., EC (Kent State University)
Tuesday 08 January 2013, 09:0009:40
Gartland Jr., EC (Kent State University)
Tuesday 08 January 2013, 09:0009:40
Cambridge University
2617
http://sms.cam.ac.uk/media/1384249
An Overview of the OseenFrank elastic model and some symmetry aspects of the Straley MeanField model for Biaxial Nematic liquid crystals
Gartland Jr., EC (Kent State University)
Tuesday 08 January 2013, 09:0009:40
In this (mostly) expository talk, we will present a brief overview of two independent topics: (1) the OseenFrank model for the spatially varying orientational properties of confined uniaxial nematic liquid crystals and (2) the meanfield model of Straley for the bulk phase behavior of biaxial nematic liquid crystals. The OseenFrank elastic model is a phenomenological variational model for equilibrium orientational properties characterized by a unitlength vector field. It is a macroscopic continuum model that has been very successful in modeling liquid crystals at the typical scales of experiments and devices. We will discuss the development of the model, its range of applicability, its relation to other models, and its strengths and weaknesses. The meanfield model of Straley was put forward almost 40 years ago as an attempt to describe the bulk phases and transitions for molecules of an architecture that would promote the development of spontaneous biaxial order. The model has received an intensive reexamination in recent years. Some of the symmetry properties of the model arise in unconventional ways, such as through degeneracies in the representations of the states of the system. We will discuss the symmetries of this model and the multiple symmetrybreaking bifurcations encountered in the numerical exploration of its equilibrium phases.
20130111T13:15:17+00:00
2617
1384249
true
16x9
false
no

Analysis and stability of bentcore liquid crystal fibers
ucs_sms_1383776_1430181
http://sms.cam.ac.uk/media/1430181
Analysis and stability of bentcore liquid crystal fibers
Bauman, P (Purdue University)
Tuesday 26 February 2013, 14:0015:00
Mon, 04 Mar 2013 12:06:52 +0000
Isaac Newton Institute
Bauman, P
16b9ad851a1f826e5655e7b4b658dacc
d5b62bda48f6d38ec1bd9af40028f9b3
77a49a4a65d911b4f70b29856b914837
90a4a72c7211e86ceba4b97a2d93d3e6
Bauman, P (Purdue University)
Tuesday 26 February 2013, 14:0015:00
Bauman, P (Purdue University)
Tuesday 26 February 2013, 14:0015:00
Cambridge University
3900
http://sms.cam.ac.uk/media/1430181
Analysis and stability of bentcore liquid crystal fibers
Bauman, P (Purdue University)
Tuesday 26 February 2013, 14:0015:00
20130304T12:07:18+00:00
3900
1430181
true
4x3
false
no

Analysis of chevron patterns using gamma convergence
ucs_sms_1383776_1406655
http://sms.cam.ac.uk/media/1406655
Analysis of chevron patterns using gamma convergence
Phillips, D (Purdue University)
Tuesday 29 January 2013, 14:0015:00
Fri, 08 Feb 2013 14:11:39 +0000
Isaac Newton Institute
Phillips, D
83288ca8cf64f0eecebebc68a58865f9
ca9d6ee58812c5724461b4e8667af918
782f65307096c2762754ff265dd7a732
5ebf834d3f9f3f1fd3d2557fa838388c
Phillips, D (Purdue University)
Tuesday 29 January 2013, 14:0015:00
Phillips, D (Purdue University)
Tuesday 29 January 2013, 14:0015:00
Cambridge University
4080
http://sms.cam.ac.uk/media/1406655
Analysis of chevron patterns using gamma convergence
Phillips, D (Purdue University)
Tuesday 29 January 2013, 14:0015:00
20130208T14:12:06+00:00
4080
1406655
true
16x9
false
no

Analysis of defects in minimizers for a planar Frank energy
ucs_sms_1383776_1469702
http://sms.cam.ac.uk/media/1469702
Analysis of defects in minimizers for a planar Frank energy
Phillips, D (Purdue University)
Friday 12 April 2013, 11:3012:30
Fri, 26 Apr 2013 12:59:49 +0100
Isaac Newton Institute
Phillips, D
29abb608cbd712d659804eacdf47ccdf
9cb880a364be7ccb7ff804427efc6f40
d28067286ba619c0fcd15e63dacba851
84ec9d6ae98b8ac8e64040e4ca69ec35
Phillips, D (Purdue University)
Friday 12 April 2013, 11:3012:30
Phillips, D (Purdue University)
Friday 12 April 2013, 11:3012:30
Cambridge University
3316
http://sms.cam.ac.uk/media/1469702
Analysis of defects in minimizers for a planar Frank energy
Phillips, D (Purdue University)
Friday 12 April 2013, 11:3012:30
Smectic C* liquid crystal films are modeled with a relaxed Frank energy,
∫Ω(ks(divu)2+kb(curlu)2+12ϵ2(1−u2)2)dx.
Here ks and kb represent the two dimensional splay and bend moduli for the film respectively with ks,kb>0, Ω is a planar domain, and u is an R2valued vector field with fixed boundary data having degree d>0. We study the limiting pattern for a sequence of minimizers {uϵ} as ϵ→0. We prove that the pattern contains d, degree one defects and that it has a either a radial or circular asymptotic form near each defect depending on the relative values of ks and kb. We further characterize a renormalized energy for the problem and show that it is minimized by the limit. This is joint work with Sean ColbertKelly.
20130426T13:00:13+01:00
3316
1469702
true
4x3
false
no

Analysis of DisclinationLine Defects in Liquid Crystals
ucs_sms_1383776_1466890
http://sms.cam.ac.uk/media/1466890
Analysis of DisclinationLine Defects in Liquid Crystals
Bauman, P (Purdue University)
Monday 08 April 2013, 11:3012:30
Tue, 23 Apr 2013 09:21:57 +0100
Isaac Newton Institute
Bauman, P
cae094451d93f09f0943e4947937442c
ede27a07edf1859ce5ea1e35e3396f61
fc8749079427549597ffea9d63115d27
547cac45c9c93c6e1c6d7fd42c0b0d4d
Bauman, P (Purdue University)
Monday 08 April 2013, 11:3012:30
Bauman, P (Purdue University)
Monday 08 April 2013, 11:3012:30
Cambridge University
3600
http://sms.cam.ac.uk/media/1466890
Analysis of DisclinationLine Defects in Liquid Crystals
Bauman, P (Purdue University)
Monday 08 April 2013, 11:3012:30
20130423T09:22:21+01:00
3600
1466890
true
4x3
false
no

Anisotropic elasticity and relaxation in nematic liquid crystals
ucs_sms_1383776_1469437
http://sms.cam.ac.uk/media/1469437
Anisotropic elasticity and relaxation in nematic liquid crystals
Biscari, P (Politecnico di Milano)
Wednesday 10 April 2013, 11:3012:30
Fri, 26 Apr 2013 11:55:38 +0100
Isaac Newton Institute
Biscari, P
5ecc662d64e901feeb3e19253a38840c
23aa8d778a5e0d0005e1250911ce7986
6598f09627f81effcc8fb98ab974e0ea
Biscari, P (Politecnico di Milano)
Wednesday 10 April 2013, 11:3012:30
Biscari, P (Politecnico di Milano)
Wednesday 10 April 2013, 11:3012:30
Cambridge University
4500
http://sms.cam.ac.uk/media/1469437
Anisotropic elasticity and relaxation in nematic liquid crystals
Biscari, P (Politecnico di Milano)
Wednesday 10 April 2013, 11:3012:30
As early as 1972, Mullen and coworkers showed experimentally that the director alignment of a nematic liquid crystal induces an anisotropic, frequency dependent sound speed in nematic liquid crystals. Similarly, Selinger and coworkers have studied a liquid crystal cell where the nematic molecules can be realigned by an ultrasonic wave, leading to a change in the optical transmission through the cell. The existing theoretical models for this acoustooptic effect propose a free energy that depends on the density gradient thus describing the nematic liquid crystal as a compressible second grade fluid. In this talk we will show that that the angular dependence of the sound speed can be easily reproduced by introducing a simple anisotropic term in the stress tensor, thus providing a simpler firstgrade model for the acoustooptic effect. The simplest term is nonhyperelastic, but we show that it can be interpreted as the quasiincompressible approximation of an elastic term which couples the director orientation with the strain. More interestingly, the frequency dependence of the anisotropic sound speed can be recovered by assuming an irreversible relaxation of the reference configuration with respect to which the strain is measured.
20130426T11:56:00+01:00
4500
1469437
true
4x3
false
no

Atomistic molecular dynamics simulations of cyanobiphenyls: A test bench for liquid crystal theories
ucs_sms_1383776_1443907
http://sms.cam.ac.uk/media/1443907
Atomistic molecular dynamics simulations of cyanobiphenyls: A test bench for liquid crystal theories
Muccioli, L (Università di Bologna)
Wednesday 20 March 2013, 14:5015:40
Thu, 21 Mar 2013 16:43:34 +0000
Isaac Newton Institute
Muccioli, L
349b4a4fc35a87c416092e6cbb087a49
836e5cb275b3cd57dc72759560b18e7e
f61b33968cb3b46e028d08c4060d5a2d
8535c9f4ec57b0514c0e69a35079ef5e
Muccioli, L (Università di Bologna)
Wednesday 20 March 2013, 14:5015:40
Muccioli, L (Università di Bologna)
Wednesday 20 March 2013, 14:5015:40
Cambridge University
2760
http://sms.cam.ac.uk/media/1443907
Atomistic molecular dynamics simulations of cyanobiphenyls: A test bench for liquid crystal theories
Muccioli, L (Università di Bologna)
Wednesday 20 March 2013, 14:5015:40
The recent increase in computer speed has determined unprecedented possibilities of modelling physical and chemical processes “in silico”. This is most true for liquid crystals, as the large system sizes and long time scales necessary for reliable predictions of their selfassembly are now becoming affordable, and where atomistic molecular dynamics simulations have proved that an accurate but classical description of intermolecular forces is adequate for obtaining a quantitative agreement with experiments for nematics and discotics. In this context, in Bologna we developed a force field for nalkyl cyanobiphenyls (nCBs)able to reproduce their experimental phase transition temperatures within a few degrees. The choice of nCBs as prototypical liquid crystal systems opens the way to an informative cross comparison between experiments, simulations, and theory. In fact, the abundance of experimental studies provides a rich database of almost any possible physical property, which serves as a stringent test for simulation predictions, and is able to reveal weaknesses and strengths of the microscopic model. Once the model has been validated, simulations can be considered superior to theoretical predictions, because they rely on a much lower number of assumptions. It becomes then possible to “revisit” and validate existing and maybe even very successful theories, not only on the basis of their predictions (comparison with the experiment) but also on their physical foundations (comparison with simulation s). This presentation will cover all the stages of this “virtuous” exercise, including: the derivation of the force field; II) the calculation of macroscopic observables III) the comparison with mean field descriptions for the nematic and smectic phases; IV) new attempts of addressing continuum theories for liquid crystal alignment. To conclude, a personal perspective of where theory could help the simulation and of future applications will be given.
20130321T16:43:56+00:00
2760
1443907
true
16x9
false
no

Avenues to Active Shape Control in Nematic Solid Sheets
ucs_sms_1383776_1508851
http://sms.cam.ac.uk/media/1508851
Avenues to Active Shape Control in Nematic Solid Sheets
Modes, CD (Rockefeller University)
Wednesday 26 June 2013, 11:0011:45
Mon, 01 Jul 2013 08:57:20 +0100
Isaac Newton Institute
Modes, CD
990b8b396846efcfc5da70859908881f
fc3e242d44368f9cc8df6787989fb231
f180acd3875778449d316bb69bec08d0
1560cb45080a56d15380581ed7938506
Modes, CD (Rockefeller University)
Wednesday 26 June 2013, 11:0011:45
Modes, CD (Rockefeller University)
Wednesday 26 June 2013, 11:0011:45
Cambridge University
2629
http://sms.cam.ac.uk/media/1508851
Avenues to Active Shape Control in Nematic Solid Sheets
Modes, CD (Rockefeller University)
Wednesday 26 June 2013, 11:0011:45
Much recent progress has been made in the study of nematic solids, both glassy and elastomeric in connection with these materials' remarkable coupling of the nematic texture and liquid crystalline properties to bulk elasticity and deformations. This talk will present a survey of the mechanisms and machineries that have been recently developed to allow for active control of many aspects of the shape of a thin sheet or shell of nematic solid: extrinsic bending, the blueprinting of intrinsic curvature and shape, switchable pores, and more. These examples, in addition to providing a rich tool box for potential device design, will also elucidate the connection between the topology of the nematic director field and the geometry of elastic deformations in this model system.
20130701T13:22:43+01:00
2629
1508851
true
16x9
false
no

Biaxial Nematics: Symmetry and Hierarchical Domain Structure
ucs_sms_1383776_1442333
http://sms.cam.ac.uk/media/1442333
Biaxial Nematics: Symmetry and Hierarchical Domain Structure
Vanakaras, A (University of Patras)
Monday 18 March 2013, 14:5015:40
Tue, 19 Mar 2013 11:50:42 +0000
Isaac Newton Institute
Vanakaras, A
54d0a5b5d18ce634cdbd737fd6227bdc
ab25a590a8b9daa438b20084fc660c68
11f66417acfc3a2ee2c5f034355289a3
bbac30e9657437902638a5ca8d197027
Vanakaras, A (University of Patras)
Monday 18 March 2013, 14:5015:40
Vanakaras, A (University of Patras)
Monday 18 March 2013, 14:5015:40
Cambridge University
2927
http://sms.cam.ac.uk/media/1442333
Biaxial Nematics: Symmetry and Hierarchical Domain Structure
Vanakaras, A (University of Patras)
Monday 18 March 2013, 14:5015:40
We present theoretical and computer simulation studies on the structure of nematic liquid crystals formed by bentcore mesogens (BCM) and by boardlike colloids (BLC). The presence of local orientational and/or positional ordering is a key feature for the interpretation of the biaxial nematic ordering observed in these systems.
In the first part we present the full phase diagram, calculated from MC molecular simulations, of sterically interacting BLC, for a range of experimentally accessible molecular dimensions/anisometries of colloids of this shape. New classes of phase transition sequences such as nematicnematic and, for the first time, a direct transition from a discotic and a biaxial nematic to an orthogonal smecticA phase have been identified. We demonstrate rigorously the formation of supramolecular entities and explain the observed phase transitions in terms of the "shape anisotropy" of these entropy driven supramolecular assemblies.
In the second part the structure of nematic liquid crystals formed by bentcore mesogens is studied in the context of MC simulations of a simple molecular model that captures the symmetry, shape, and flexibility of achiral BCMs. Our results indicate the formation of (i) clusters exhibiting local smectic order, orthogonal or tilted, with strong inlayer polar correlations and antiferroelectric juxtaposition of successive layers and (ii) large homochiral domains through the helical arrangement of the tilted smectic clusters, while the orthogonal clusters produce achiral (untwisted) nematic states.
The results of our work offers a deeper understanding of the nematicnematic transitions and, ultimately, of the nematic phase and can serve as a comprehensive guide to experiment, towards the design of anisotropic liquids with the desired functionality, as well as to theory for testing and improving analytical molecular models using simple intermolecular potentials.
20130319T11:51:02+00:00
2927
1442333
true
16x9
false
no

Boundaryroughness effects in nematic liquid crystals
ucs_sms_1383776_1487183
http://sms.cam.ac.uk/media/1487183
Boundaryroughness effects in nematic liquid crystals
Foldes, R (Minneapolis)
Tuesday 21 May 2013, 16:0016:20
Fri, 24 May 2013 12:46:06 +0100
Isaac Newton Institute
Foldes, R
ead318951be7e448b4ae88c999075e33
f800b0657009dad59d8eda32e46a66f4
3a9efa3e7b1a84951d28cc697770d79f
a353f4b94069ca6ba6e4c94e32044dd3
Foldes, R (Minneapolis)
Tuesday 21 May 2013, 16:0016:20
Foldes, R (Minneapolis)
Tuesday 21 May 2013, 16:0016:20
Cambridge University
951
http://sms.cam.ac.uk/media/1487183
Boundaryroughness effects in nematic liquid crystals
Foldes, R (Minneapolis)
Tuesday 21 May 2013, 16:0016:20
Paolo Biscari and Stefano Turzi considered a plate with an undulatory pattern. They replace the corrugation with sinusoidal boundary conditions, and use formal asymptotics for the analysis. I would like to use the method of gamma convergence to determine the effective energy and its minimizers for this problem.
20130524T12:46:32+01:00
951
1487183
true
16x9
false
no

Brickbybrick Stabilizing the Biaxial Nematic Phase
ucs_sms_1383776_1442379
http://sms.cam.ac.uk/media/1442379
Brickbybrick Stabilizing the Biaxial Nematic Phase
Belli, S (Utrecht University)
Monday 18 March 2013, 16:0016:50
Tue, 19 Mar 2013 12:13:41 +0000
Isaac Newton Institute
Belli, S
f02c300f42424434be55da995103f709
82bf977a6f915979e2673f6374b5ef68
dc905464e089f86a1c1b603fa0cba910
a933b4027888488558cc9d78bef6f0d9
Belli, S (Utrecht University)
Monday 18 March 2013, 16:0016:50
Belli, S (Utrecht University)
Monday 18 March 2013, 16:0016:50
Cambridge University
2576
http://sms.cam.ac.uk/media/1442379
Brickbybrick Stabilizing the Biaxial Nematic Phase
Belli, S (Utrecht University)
Monday 18 March 2013, 16:0016:50
A fascinating way to improve the presentday liquid crystal technology consists of imagining to use new liquid crystal phases with "exotic" properties, like the biaxial nematic phase. However, as an essential step in this direction one has to establish the conditions under which such a phase is thermodynamically stable. Inspired by a recent experiment on a colloidal suspension of mineral goethite particles [1], we use a mean field theory to investigate the phase behavior of boardlike particles. By modelling these “nanoscopic bricks” as cuboids with a hardbody interaction, we analyze the conditions of stability of the longsearched biaxialnematic phase. We show that under specific conditions sizepolydispersity, a common property in most colloids, can increase appreciably the stability of this liquid crystal phase [2]. Moreover, we deduce that this effect can be interpreted in terms of an effective attraction, and therefore that a similar stability could be induced by a nonadsorbing depletant, like a polymeric solution [3]. [1] E. van den Pol et al., Phys. Rev. Lett. 103, 055901 (2009) [2] S. Belli, A. Patti, M. Dijkstra and R. van Roij, Phys. Rev. Lett. 107, 148303 (2011) [3] S. Belli, M. Dijkstra and R. van Roij, J. Phys.: Condens. Matter 24, 284128 (2012)
20130319T12:14:02+00:00
2576
1442379
true
16x9
false
no

Chiral nematic minimisation problems, function spaces and competing theories
ucs_sms_1383776_1487038
http://sms.cam.ac.uk/media/1487038
Chiral nematic minimisation problems, function spaces and competing theories
Bedford, S (Oxford)
Tuesday 21 May 2013, 11:5012:10
Fri, 24 May 2013 10:46:55 +0100
Isaac Newton Institute
Bedford, S
39d7627a3a7c33d524e3386bc8668045
f3a4b14e1960e8776a0007fdb47f0ca2
9a686434fcbcc40dbc75c66d639a5ec2
a681b632773347959e41fe2a0e68ddcf
Bedford, S (Oxford)
Tuesday 21 May 2013, 11:5012:10
Bedford, S (Oxford)
Tuesday 21 May 2013, 11:5012:10
Cambridge University
1284
http://sms.cam.ac.uk/media/1487038
Chiral nematic minimisation problems, function spaces and competing theories
Bedford, S (Oxford)
Tuesday 21 May 2013, 11:5012:10
Generally chiral nematic liquid crystals have been seen as an aside to nematics, and have been studied less as a result. However they can exhibit many and varied patterns in the form of cholesteric fingers or filaments. If these behaviours were understood and controllable it could prove to be a valuable advance in industry devices. The notion of cholesteric frustration appears to be what drives the existence of the complicated minima, as a result boundary conditions, cell geometry and surface energies are all extremely important in the creation of a tractable problem, but so too is the function space in which we choose to minimise. More generally it might be possible, in some cases, to see different theories (OseenFrank, Ericksen, QTensor) as merely minimisations in different function spaces.
20130524T10:47:22+01:00
1284
1487038
true
16x9
false
no

Chiral symmetry breaking in confined nematics
ucs_sms_1383776_1508802
http://sms.cam.ac.uk/media/1508802
Chiral symmetry breaking in confined nematics
Vitelli, V (Universiteit Leiden)
Wednesday 26 June 2013, 09:0009:45
Mon, 01 Jul 2013 08:53:38 +0100
Isaac Newton Institute
Vitelli, V
98472b2f8b2a3d3b89a5a4373cd7c795
3e879fdb2b6dbd5f77b208c5d62609d0
03753531c399a5d6a16e422459056d93
c584c501259bcdc2a3de9a271685c261
Vitelli, V (Universiteit Leiden)
Wednesday 26 June 2013, 09:0009:45
Vitelli, V (Universiteit Leiden)
Wednesday 26 June 2013, 09:0009:45
Cambridge University
2717
http://sms.cam.ac.uk/media/1508802
Chiral symmetry breaking in confined nematics
Vitelli, V (Universiteit Leiden)
Wednesday 26 June 2013, 09:0009:45
We analyze the complex nematic textures and defect structures that result from the competition between topological constraints and the elasticity of nematic liquid crystals confined in droplets with handles stabilized against surfacetensiondriven instabilities using a yieldstress material as outer fluid. We uncover a surprisingly persistent twisted configuration of the nematic director inside the droplets when tangential anchoring is established at their boundaries, which we explain after considering the influence of saddlesplay on the elastic free energy. For toroidal droplets, we find that the saddlesplay energy screens the twisting energy resulting in a spontaneous breaking of mirror symmetry; the chiral twisted state persists for aspect ratios as large as ~20. For droplets with additional handles, two additional 1 surface defects per handle are generated in regions with local saddle geometry.
20130701T13:18:59+01:00
2717
1508802
true
16x9
false
no

Coarsegrained modelling and computer simulations of liquid crystals
ucs_sms_1383776_1459913
http://sms.cam.ac.uk/media/1459913
Coarsegrained modelling and computer simulations of liquid crystals
Berardi, R (Università di Bologna)
Monday 18 March 2013, 11:5012:40
Fri, 12 Apr 2013 16:38:15 +0100
Isaac Newton Institute
Berardi, R
08a48c523afed0f91319fc583b9a8484
06ec2d357cd7382d5c5e39455fb4492b
532f414d9e01e0ed72cf96cb916f3880
a7cd3cb09988c945cf0803fb09291524
Berardi, R (Università di Bologna)
Monday 18 March 2013, 11:5012:40
Berardi, R (Università di Bologna)
Monday 18 March 2013, 11:5012:40
Cambridge University
2700
http://sms.cam.ac.uk/media/1459913
Coarsegrained modelling and computer simulations of liquid crystals
Berardi, R (Università di Bologna)
Monday 18 March 2013, 11:5012:40
Coarsegrained models for liquid crystals are typically based on pair potentials where an entire mesogenic molecule is represented by one (or a few) anisotropic geometrical object (e.g. a spherocylinder, or an ellipsoid) with either purely repulsive or attractiverepulsive interactions. Computer simulations relying on these simple offlattice models are able to reproduce the experimental phase sequences and order parameters of thermotropic mesogens and are useful for studying the relationship between specific molecular properties (e.g. shape or interaction anisotropies) and macroscopic liquid crystalline behaviour.
We will review the principal coarsegrained level models currently used in computer simulations of liquid crystals and discuss their advantages and shortcomings using the results for selected cases.
20130412T16:38:39+01:00
2700
1459913
true
16x9
false
no

Coarsening and Qtensors for nematics (a mathematician's perspective)
ucs_sms_1383776_1442623
http://sms.cam.ac.uk/media/1442623
Coarsening and Qtensors for nematics (a mathematician's perspective)
Zarnescu, A
Wednesday 13 March 2013, 14:0015:00
Tue, 19 Mar 2013 16:06:48 +0000
Isaac Newton Institute
Zarnescu, A
2b9693ad82465566836b27df5381fa82
f7d5a023e4ba8aa90b89d5689f132030
a7223858c9119f982f155187bd735daa
7686400f14ed32b67451a1f954f9f26d
Zarnescu, A
Wednesday 13 March 2013, 14:0015:00
Zarnescu, A
Wednesday 13 March 2013, 14:0015:00
Cambridge University
3098
http://sms.cam.ac.uk/media/1442623
Coarsening and Qtensors for nematics (a mathematician's perspective)
Zarnescu, A
Wednesday 13 March 2013, 14:0015:00
20130319T16:07:10+00:00
3098
1442623
true
4x3
false
no

Colloidal Doping of Cholesterics and Blue Phases
ucs_sms_1383776_1510902
http://sms.cam.ac.uk/media/1510902
Colloidal Doping of Cholesterics and Blue Phases
Cates, M (University of Edinburgh)
Tuesday 25 June 2013, 09:4510:30
Wed, 03 Jul 2013 09:07:42 +0100
Isaac Newton Institute
Cates, M
b70899d5944ac8dc53976b7f20844046
3686c8a62b3134586aaa24f7a5ed2bee
b2827772314493f7f70e677a2835d310
5f51767a7436fea0f697730ac89072ef
Cates, M (University of Edinburgh)
Tuesday 25 June 2013, 09:4510:30
Cates, M (University of Edinburgh)
Tuesday 25 June 2013, 09:4510:30
Cambridge University
2842
http://sms.cam.ac.uk/media/1510902
Colloidal Doping of Cholesterics and Blue Phases
Cates, M (University of Edinburgh)
Tuesday 25 June 2013, 09:4510:30
At the interface between a cholesteric phase and an isotropic fluid, an array of defects arises. This creates for embedded colloidal particles a free energy landscape that depends on the ratio of colloid size to cholesteric pitch and on the strength of anchoring at the colloidcholesteric interface. I shall outline recent experiments and simulations that probe this landscape. A somewhat similar situation arises when colloids are added to blue phases, for which the defect array is not interfacial but permeates the bulk phase. Preliminary simulations suggest a variety of structures, many metastable, with interesting transitions inducible by external fields and/or flow.
20130704T10:35:29+01:00
2842
1510902
true
16x9
false
no

Conclusions from Liquid Crystal Defects and their Geometry, Active and Solid Liquid Crystals, and Related Systems Workshop
ucs_sms_1383776_1519217
http://sms.cam.ac.uk/media/1519217
Conclusions from Liquid Crystal Defects and their Geometry, Active and Solid Liquid Crystals, and Related Systems Workshop
Ball, J
Friday 28 June 2013, 11:3011:45
Mon, 15 Jul 2013 13:26:29 +0100
Isaac Newton Institute
Ball, J
830de1299458614d289b789e844b406b
4b9cdbfd7198524435fc66f95ec0877b
8a9988a26501180bfe862a80b6365c83
843ff284c9f7fa8fa06bb5b3f8accaf7
Ball, J
Friday 28 June 2013, 11:3011:45
Ball, J
Friday 28 June 2013, 11:3011:45
Cambridge University
1535
http://sms.cam.ac.uk/media/1519217
Conclusions from Liquid Crystal Defects and their Geometry, Active and Solid Liquid Crystals, and Related Systems Workshop
Ball, J
Friday 28 June 2013, 11:3011:45
20130715T13:51:04+01:00
1535
1519217
true
16x9
false
no

Curvature potentials for defects on nematic shells
ucs_sms_1383776_1508874
http://sms.cam.ac.uk/media/1508874
Curvature potentials for defects on nematic shells
Virga, E (Università degli Studi di Pavia)
Wednesday 26 June 2013, 11:4512:30
Mon, 01 Jul 2013 08:59:51 +0100
Isaac Newton Institute
Virga, E
4fc406ff1994858d3f87a68cea8963fd
5e26c82fb9ad471650f21d51755855d7
54330755b2a0d2b5a668681e83acc55c
59ee3647f197c54526e331adeba7d939
Virga, E (Università degli Studi di Pavia)
Wednesday 26 June 2013, 11:4512:30
Virga, E (Università degli Studi di Pavia)
Wednesday 26 June 2013, 11:4512:30
Cambridge University
3089
http://sms.cam.ac.uk/media/1508874
Curvature potentials for defects on nematic shells
Virga, E (Università degli Studi di Pavia)
Wednesday 26 June 2013, 11:4512:30
Nematic shells are thin films of nematic liquid crystal deposited on rigid colloidal particles, which can be manufactured in different shapes and guises. The twodimensional order tensor that describes the local organization of liquid crystal molecules, which tend to lie parallel to the colloids' surface, vanishes whenever no orientation is prevailing on average. The points where this takes place are called defect, as they lack order. The lectuer will review recent work concerned with the interaction between defects and the underlying surface. In particular, arguments will be offered that identify appropiate geometric potentials, depending on the shell's curvatures, which either promote or hamper defects, attract or repel them.
20130701T13:24:23+01:00
3089
1508874
true
16x9
false
no

Decoupling the EricksenLeslie equations
ucs_sms_1383776_1430595
http://sms.cam.ac.uk/media/1430595
Decoupling the EricksenLeslie equations
Mottram, N (University of Strathclyde)
Thursday 28 February 2013, 11:0012:00
Mon, 04 Mar 2013 16:32:52 +0000
Isaac Newton Institute
Mottram, N
723c4767ceaf93205c504ab1cfdb9661
78a5106543bba2cd5f396ec5115c57b2
b5fb5229039005bdc9cfd7aa0e124c0f
b736f5b713fd5aef8d08a43fced8e940
Mottram, N (University of Strathclyde)
Thursday 28 February 2013, 11:0012:00
Mottram, N (University of Strathclyde)
Thursday 28 February 2013, 11:0012:00
Cambridge University
2722
http://sms.cam.ac.uk/media/1430595
Decoupling the EricksenLeslie equations
Mottram, N (University of Strathclyde)
Thursday 28 February 2013, 11:0012:00
20130304T16:33:16+00:00
2722
1430595
true
16x9
false
no

Defects in nematic polymer hydrodynamics: survey of our work over the past 10 years
ucs_sms_1383776_1387505
http://sms.cam.ac.uk/media/1387505
Defects in nematic polymer hydrodynamics: survey of our work over the past 10 years
Forest, G (University of North Carolina )
Wednesday 09 January 2013, 11:5012:30
Tue, 15 Jan 2013 16:17:21 +0000
Isaac Newton Institute
Forest, G
8d1b8a2414df34eadd13dff588149134
09ae17ef06022de1f0c0c5031b0ee1d5
44482bc09eac730420191205e43cefbf
ab9f4d9f4e02c9dda68c04466e797afa
816bcdbeb3680ed72e21c9bf6b1ed694
Forest, G (University of North Carolina )
Wednesday 09 January 2013,...
Forest, G (University of North Carolina )
Wednesday 09 January 2013, 11:5012:30
Cambridge University
2600
http://sms.cam.ac.uk/media/1387505
Defects in nematic polymer hydrodynamics: survey of our work over the past 10 years
Forest, G (University of North Carolina )
Wednesday 09 January 2013, 11:5012:30
20130115T16:17:49+00:00
2600
1387505
true
16x9
false
no

Density Functional Theory for HardBody Models of Liquid Crystals
ucs_sms_1383776_1442227
http://sms.cam.ac.uk/media/1442227
Density Functional Theory for HardBody Models of Liquid Crystals
Evans, B (University of Bristol)
Monday 18 March 2013, 11:0011:50
Tue, 19 Mar 2013 10:51:47 +0000
Isaac Newton Institute
Evans, B
5f4fff77600fd05292c2a77179fed00f
3415de384b275a1c012155ea9a151e46
0beea1c9b391fb303f12100acb4197ad
876413e42b989dd343fbb04b120bd55d
Evans, B (University of Bristol)
Monday 18 March 2013, 11:0011:50
Evans, B (University of Bristol)
Monday 18 March 2013, 11:0011:50
Cambridge University
3333
http://sms.cam.ac.uk/media/1442227
Density Functional Theory for HardBody Models of Liquid Crystals
Evans, B (University of Bristol)
Monday 18 March 2013, 11:0011:50
Hardbody models for lyotropic liquid crystalline phases date back to Onsager (1949) who showed that a fluid of hard rods can exhibit a transition from an isotropic to a nematic phase that is driven purely by entropy. Onsager’s treatment is based on a secondvirial description of the free energy that is accurate in the (Onsager) limit of very long thin rods (spherocylinders). For shorter spherocylinders and for smectic and crystalline phases, as well as for treating inhomogeneous fluids, e.g. situations arising at interfaces between phases and in anchoring and wetting at substrates, it is necessary to develop theories in which the ensemble averaged onebody particle density depends on both the orientation and the position of the particles. Density Functional Theory (DFT), developed first for simple fluids with spherical particles, is one such theory and it has emerged as powerful means of tackling phase transitions and the structure and thermodynamics of inhomogeneous fl uids. This lecture will provide an overview of the basics of DFT before focusing on the successful geometrybased Fundamental Measure Theory (FMT) approach introduced originally by Rosenfeld (1989) for hardsphere mixtures. FMT for spheres has as its starting point the incorporation of the exact second virial contribution into the free energy functional. Attempts to extend the ideas of FMT to hard bodies of arbitrary shape were made by Rosenfeld (1994, 1995). These failed to yield a stable nematic phase for spherocylinders, partly because they did not include the correct Onsager limit. In recent years there has been renewed effort to develop improved FMT that go towards capturing this limit. I shall describe progress for a variety of model colloidal liquid crystalline fluids including hard spherocylinders, mixtures of hard spheres and rods, and hard thin platelets. If time permits I shall mention some recent applications of Dynamical DFT to nonequilibrium properties.
20130319T10:52:07+00:00
3333
1442227
true
16x9
false
no

Derivation of the Balance Laws for Liquid Crystals using Statistical Mechanics
ucs_sms_1383776_1469450
http://sms.cam.ac.uk/media/1469450
Derivation of the Balance Laws for Liquid Crystals using Statistical Mechanics
Seguin, B (McGill University)
Thursday 11 April 2013, 09:0010:00
Fri, 26 Apr 2013 11:58:06 +0100
Isaac Newton Institute
Seguin, B
571b60b4bdd37bf3a167e3a6da215a9f
3fcbb178442d3060ee5ca95602023e57
021f4a119957d246303ddc7ed2204a0d
4b8a4eddcd0ae0c847d4f54fb3206ff7
Seguin, B (McGill University)
Thursday 11 April 2013, 09:0010:00
Seguin, B (McGill University)
Thursday 11 April 2013, 09:0010:00
Cambridge University
3410
http://sms.cam.ac.uk/media/1469450
Derivation of the Balance Laws for Liquid Crystals using Statistical Mechanics
Seguin, B (McGill University)
Thursday 11 April 2013, 09:0010:00
I will outline how one can derive the continuumlevel balances for liquid crystals using statistical mechanics. I will start by considering a discrete system of rigid rods, which motivates an appropriate state space. A probability function is then introduced that satisfies the Liouville equation. This equation serves as the starting point for the derivation of all of the continuumlevel balances. The terms appearing in the derived balances, some being nonstandard, are interpreted as expected values.
20130426T11:58:28+01:00
3410
1469450
true
4x3
false
no

Design of liquid crystal superstructures: geometry, topology, flow, and mesophase
ucs_sms_1383776_1444287
http://sms.cam.ac.uk/media/1444287
Design of liquid crystal superstructures: geometry, topology, flow, and mesophase
Ravnik, M (University of Oxford/Ljubljana)
Thursday 21 March 2013, 09:0009:50
Fri, 22 Mar 2013 10:42:55 +0000
Isaac Newton Institute
Ravnik, M
a3f7af1902b66778322c941b06275481
21fbd5cd84cb541ee8278d03c77b771f
91fcfa9adf372a60e4ee16a84f83698a
2ff0b9c9f29c866b65822a439f281589
Ravnik, M (University of Oxford/Ljubljana)
Thursday 21 March 2013, 09:0009:50
Ravnik, M (University of Oxford/Ljubljana)
Thursday 21 March 2013, 09:0009:50
Cambridge University
3079
http://sms.cam.ac.uk/media/1444287
Design of liquid crystal superstructures: geometry, topology, flow, and mesophase
Ravnik, M (University of Oxford/Ljubljana)
Thursday 21 March 2013, 09:0009:50
Structuring of liquid crystalline fluids allows for various exciting material mechanisms such as selfassembly [1], memory effects [2], entanglement [3], nonlinear electrophoresis [4], nonlinear rotary dynamics [5], and nanoscopic surface shape changing [6]. Here, we present strategies for creating colloidal and bulk liquid crystal superstructures, in 2D and 3D, using nematic, twisted nematic, and cholesteric blue phases. Our work is based on the numerical minimization of the phenomenological Landaude Gennes free energy and solving hybrid Lattice Boltzmann algorithm for BerisEdwards nematodynamics model, with full link to experiments. We show that 3D colloidal crystals can be assembled from elastic dipoles of spherical beads in nematic liquid crystals or via inherently inhomogeneous order profiles in cholesteric blue phases [7]. By using colloidal platelets, we show that crystalline [8] and quasicrystalline symmetry can be imprinted into the structures. Topological defects are manipulated into structures of knots and links using various colloidal arrays [9]. Finally, passive and active material flow is used to produce distinct backflow generated complex nematic profiles in microfluidic channels.
[1] P. Poulin, H. Stark, T. C. Lubensky, D. A. Weitz, Science 275, 1770 (1997). [2] T. Araki, M. Buscaglia, T. Bellini, and H. Tanaka, Nature Materials 10, 303 (2011). [3] M. Ravnik, et al, Phys. Rev. Lett. 99, 247801 (2007). [4] O. D. Lavrentovich, I. Lazo and O. P. Pishnyak, Nature 467, 947 (2010). [5] J. S. Lintuvuori, K. Stratford, M. E. Cates, D. Marenduzzo, Phys. Rev. Lett. 107, 267802 (2012). [6] D. Vanzo, M. Ricci, R. Berardi and C. Zannoni, Soft Matter 8, 11790 (2012). [7] M. Ravnik, G. P. Alexander, J. M. Yeomans, and S. Zumer, Proc. Natl. Acad. Sci. USA 108, 5188 (2011). [8] J. Dontabhaktuni, M. Ravnik and S. Zumer, Soft Matter 8, 1657 (2012). [9] U. Tkalec, M. Ravnik, S. Copar, S. Zumer and I. Musevic, Science 333, 62 (2011).
20130322T10:43:16+00:00
3079
1444287
true
16x9
false
no

Designing a crawling cell using soft materials
ucs_sms_1383776_1489026
http://sms.cam.ac.uk/media/1489026
Designing a crawling cell using soft materials
Tjhung, E (Edinburgh)
Wednesday 22 May 2013, 11:1011:30
Tue, 28 May 2013 09:20:54 +0100
Isaac Newton Institute
Tjhung, E
98d84108aee33114bee2808b1121a8bf
9af7b138d17a108bb42d8f68ee2e2afd
17629f66620cc974c2605e96aece5974
6ad2eb1dbe7285011842446aa7838c77
Tjhung, E (Edinburgh)
Wednesday 22 May 2013, 11:1011:30
Tjhung, E (Edinburgh)
Wednesday 22 May 2013, 11:1011:30
Cambridge University
1345
http://sms.cam.ac.uk/media/1489026
Designing a crawling cell using soft materials
Tjhung, E (Edinburgh)
Wednesday 22 May 2013, 11:1011:30
Eukaryotic cells have been observed to be able to move in various media. One obvious example is provided by the keratocyte cells which are able to crawl on a 2D substrate (such as glass slides). In this talk, we aim to build a minimal hydrodynamic model of a crawling cell using ideas from soft matter physics such as binary liquid and liquid crystals. The simplest model of a cell is probably just a droplet sitting on a surface. However, a passive droplet will not be able to move on its own. To make it moves, we have to add some nonequilibrium physics into it. This is provided by actin polymerisation and actinmyosin contraction inside the cell cytoskeleton. These two active processes can then be coarsegrained into a set of hydrodynamic equations which are similar to that of active liquid crystals.
20130528T09:21:27+01:00
1345
1489026
true
16x9
false
no

Different flavours of the meanfield theory
ucs_sms_1383776_1443681
http://sms.cam.ac.uk/media/1443681
Different flavours of the meanfield theory
Virga, E (Università degli Studi di Pavia)
Wednesday 20 March 2013, 11:5012:40
Thu, 21 Mar 2013 12:56:04 +0000
Isaac Newton Institute
Virga, E
6db00e81957b3de19c1fa6e5cc0d7f4e
4672cffd2cfe9a86acf27bec3f465de6
394f7a7e5d68579e46b74d8399077b71
c89b8ddff80f90afc57195373426c609
Virga, E (Università degli Studi di Pavia)
Wednesday 20 March 2013, 11:5012:40
Virga, E (Università degli Studi di Pavia)
Wednesday 20 March 2013, 11:5012:40
Cambridge University
3489
http://sms.cam.ac.uk/media/1443681
Different flavours of the meanfield theory
Virga, E (Università degli Studi di Pavia)
Wednesday 20 March 2013, 11:5012:40
Since the proposal for a remarkably simple theory of ferromagnetism made by Weiss in 1906, under the assumption that each molecule suffered an effective magnetic field (le champ intérieur, in Weiss' words) mimicking the average action of all other molecules, the notion of mean field has grown and acquired a life of its own. The most striking application to liquid crystal science of the meanfield formalism is perhaps the MaierSaupe theory for the nematic phase. Many other models and approximations are comprised under the general heading of meanfield theory, though often one may hardly find any trace of an average, collective field there, its place being taken instead by a generalized order field. Some theories in this ample catalogue are variational, while others are not. All feature a key selfconsistency condition, which may involve a probability distribution density as well as an order field. The lecture will attempt to justify the key selfconsistency equation in a rigorous way for the different flavours that theory has taken.
20130321T12:56:25+00:00
3489
1443681
true
16x9
false
no

Directed assembly in liquid crystals. Nanoparticles and nanodroplets
ucs_sms_1383776_1444389
http://sms.cam.ac.uk/media/1444389
Directed assembly in liquid crystals. Nanoparticles and nanodroplets
de Pablo, J (University of WisconsinMadison)
Thursday 21 March 2013, 11:5012:40
Fri, 22 Mar 2013 13:04:33 +0000
Isaac Newton Institute
de Pablo, J
118421a1daa37aa1b854e3468981d543
6a49d049ac27f553fcb63963191eb3f4
74b76bf8f5fad9f4245e18da4719c8a9
4ee9e4bbae2c9fd2d5fa21c8f8bc4e8d
de Pablo, J (University of WisconsinMadison)
Thursday 21 March 2013,...
de Pablo, J (University of WisconsinMadison)
Thursday 21 March 2013, 11:5012:40
Cambridge University
3119
http://sms.cam.ac.uk/media/1444389
Directed assembly in liquid crystals. Nanoparticles and nanodroplets
de Pablo, J (University of WisconsinMadison)
Thursday 21 March 2013, 11:5012:40
Liquid crystals are remarkably sensitive to interfacial interactions. Small perturbations at a liquid crystal interface can in fact be amplified over relative long distances, thereby providing the basis for a wide range of applications. Our recent research efforts have focused on the reverse phenomenon; that is, we have sought to manipulate the interfacial assembly of nanoparticles or the organization of surface active molecules by controlling the structure of a liquid crystal. This presentation will consist of a review of the basic principles that are responsible for liquid crystalmediated interactions, followed by demonstrations of those principles in the context of two types of systems. In the first, a liquid crystal is used to direct the assembly of nanoparticles; through a combination of molecular and continuum models, it is found that minute changes in interfacial energy and particle size lead to liquidcrystal induced attractions that can span multiple orders of magni tude. Theoretical predictions are confirmed by experimental observations, which also suggest that LCmediated assembly provides an effective means for fabrication of plasmonic devices. In the second application, the structure of a liquid crystal is controlled by confinement. It is shown that when confined to submicron droplets, the morphology of the liquid crystal depends on a delicate balance between bulk and interfacial contributions to the free energy; that balance can be easily perturbed by adsorption of analytes at the interface, thereby providing the basis for development of chemical or biological sensors. Theoretical predictions also indicate that the threedimensional order of a liquid crystal can be projected onto a twodimensional interface, and give rise to novel nanostructures that are not found in simple isotropic fluids.
20130322T13:04:56+00:00
3119
1444389
true
16x9
false
no

Disclinations & Biaxiality in Light
ucs_sms_1383776_1458717
http://sms.cam.ac.uk/media/1458717
Disclinations & Biaxiality in Light
Dennis, M (University of Bristol)
Tuesday 02 April 2013, 14:0015:00
Thu, 11 Apr 2013 11:22:03 +0100
Isaac Newton Institute
Dennis, M
d05f6c61ab0a6aca53571f6af0ed349c
ce76cbb05e75bbed2604aef1eb147af5
3f0a3fd7298416898b7a87cdd2d066b6
15f8a5b8024985f4f7c2c0f49682b57c
Dennis, M (University of Bristol)
Tuesday 02 April 2013, 14:0015:00
Dennis, M (University of Bristol)
Tuesday 02 April 2013, 14:0015:00
Cambridge University
5340
http://sms.cam.ac.uk/media/1458717
Disclinations & Biaxiality in Light
Dennis, M (University of Bristol)
Tuesday 02 April 2013, 14:0015:00
20130411T11:22:25+01:00
5340
1458717
true
4x3
false
no

Domain wall motion in magnetic nanowires: an asymptotic approach
ucs_sms_1383776_1487164
http://sms.cam.ac.uk/media/1487164
Domain wall motion in magnetic nanowires: an asymptotic approach
Lund, R (Bristol)
Tuesday 21 May 2013, 14:1014:30
Fri, 24 May 2013 12:03:54 +0100
Isaac Newton Institute
Lund, R
ca3d0f30fc1bbee4b1b61e9f9bde7c04
9921e6568741cea6a9dc7242e7751a29
38d83901a086c4df9fb578019b5fe6a9
fc6cc849cc66c66f02dfead359200920
Lund, R (Bristol)
Tuesday 21 May 2013, 14:1014:30
Lund, R (Bristol)
Tuesday 21 May 2013, 14:1014:30
Cambridge University
1419
http://sms.cam.ac.uk/media/1487164
Domain wall motion in magnetic nanowires: an asymptotic approach
Lund, R (Bristol)
Tuesday 21 May 2013, 14:1014:30
We develop a systematic asymptotic description of domain wall motion in a magnetic nanowire. The LandauLifshitzGilbert equation is linearized about a static solution and the magnetization dynamics investigated via a perturbation expansion. We compute leading order behaviour, propagation velocities, and first order corrections of both travelling waves and oscillatory solutions, and find bifurcation points between these two types of solutions.
20130524T12:04:20+01:00
1419
1487164
true
16x9
false
no

Effect of flow on nematic fluctuations in a slab
ucs_sms_1383776_1486001
http://sms.cam.ac.uk/media/1486001
Effect of flow on nematic fluctuations in a slab
Copic, M (Univerza v Ljubljani)
Tuesday 14 May 2013, 14:0015:00
Wed, 22 May 2013 16:24:40 +0100
Isaac Newton Institute
Copic, M
d26432a21ab7be747c646f218c6ba0e6
dfade37529e746ab756658cbe26b2e66
025ec6234b151e5a559e0c957afbc159
0130e285a8d28e473ecb26a29783c85b
Copic, M (Univerza v Ljubljani)
Tuesday 14 May 2013, 14:0015:00
Copic, M (Univerza v Ljubljani)
Tuesday 14 May 2013, 14:0015:00
Cambridge University
2566
http://sms.cam.ac.uk/media/1486001
Effect of flow on nematic fluctuations in a slab
Copic, M (Univerza v Ljubljani)
Tuesday 14 May 2013, 14:0015:00
20130522T16:25:04+01:00
2566
1486001
true
16x9
false
no

Eigenframe discontinuities, commutators and nematic defects
ucs_sms_1383776_1467558
http://sms.cam.ac.uk/media/1467558
Eigenframe discontinuities, commutators and nematic defects
Zarnescu, AD (University of Sussex)
Tuesday 09 April 2013, 14:0015:00
Wed, 24 Apr 2013 09:54:48 +0100
Isaac Newton Institute
Zarnescu, AD
5ca0ed4c80dc8d6034e1a642cb6642e9
c8471a693dd7a0b9e7e83cf11b79e4b2
dd15d65ff30304e7b0266f64e6a5f17c
f484e926a08eb69882c83c4fc13fa109
Zarnescu, AD (University of Sussex)
Tuesday 09 April 2013, 14:0015:00
Zarnescu, AD (University of Sussex)
Tuesday 09 April 2013, 14:0015:00
Cambridge University
3660
http://sms.cam.ac.uk/media/1467558
Eigenframe discontinuities, commutators and nematic defects
Zarnescu, AD (University of Sussex)
Tuesday 09 April 2013, 14:0015:00
In the framework of De Gennes' Qtensor theory of nematics one can interpret defects as eigenframe discontinuities. A significant analytical difficulty related to understanding these discontinuities is due to the rather complicated relation between the multiparameter dependent matrices and their parametrized eigenvectors. We present necessary and sufficient criteria for determining eigenframe discontinuities (criteria expressed in terms of suitable commutators) as well as some consequences. This is joint work with Jonathan Robbins and Valeriy Slastikov.
20130424T09:55:09+01:00
3660
1467558
true
4x3
false
no

Eigenvalue Constraints and Regularity of Qtensor NavierStokes Dynamics
ucs_sms_1383776_1466921
http://sms.cam.ac.uk/media/1466921
Eigenvalue Constraints and Regularity of Qtensor NavierStokes Dynamics
Wilkinson, M (University of Oxford)
Monday 08 April 2013, 15:3016:00
Tue, 23 Apr 2013 09:26:01 +0100
Isaac Newton Institute
Sarah Middle
578145deaf416a1c3f4649cb1c56c9bb
9fc0a345b93ae38764cda8c64fc060b0
8863a09398ad34f280dfe554c7af278f
51615df818543a4a5ded2efce47d9291
Wilkinson, M (University of Oxford)
Monday 08 April 2013, 15:3016:00
Wilkinson, M (University of Oxford)
Monday 08 April 2013, 15:3016:00
Cambridge University
1580
http://sms.cam.ac.uk/media/1466921
Eigenvalue Constraints and Regularity of Qtensor NavierStokes Dynamics
Wilkinson, M (University of Oxford)
Monday 08 April 2013, 15:3016:00
20130423T09:26:22+01:00
1580
1466921
true
4x3
false
no

Elementary statistical models for nematic transitions in liquidcrystalline systems
ucs_sms_1383776_1458857
http://sms.cam.ac.uk/media/1458857
Elementary statistical models for nematic transitions in liquidcrystalline systems
Liarte, D (Universidade de São Paulo)
Thursday 04 April 2013, 14:0015:00
Thu, 11 Apr 2013 12:55:35 +0100
Isaac Newton Institute
Liarte, D
a886a0239eb2fefd27fcd6de996c007d
bf1ecbcc3fec3844c5d58e0e034f3d3f
47a825f78b7a1e866863c2ded7225aa2
68c4ebf24bfbc368d935d4296efcc756
Liarte, D (Universidade de São Paulo)
Thursday 04 April 2013, 14:0015:00
Liarte, D (Universidade de São Paulo)
Thursday 04 April 2013, 14:0015:00
Cambridge University
2850
http://sms.cam.ac.uk/media/1458857
Elementary statistical models for nematic transitions in liquidcrystalline systems
Liarte, D (Universidade de São Paulo)
Thursday 04 April 2013, 14:0015:00
20130411T12:55:59+01:00
2850
1458857
true
4x3
false
no

EndotoxinInduced Ordering Transitions in Liquid Crystalline Droplets
ucs_sms_1383776_1499037
http://sms.cam.ac.uk/media/1499037
EndotoxinInduced Ordering Transitions in Liquid Crystalline Droplets
Abbott, N (University of WisconsinMadison )
Thursday 13 June 2013, 16:0017:30
Fri, 14 Jun 2013 14:04:12 +0100
Isaac Newton Institute
Abbott, N
0e044ba945cc912adaea5738bc7fe6c7
250a161afa55c339ea967b6e27fc9fd2
7e0c5079a95b7219f97900e0cab7682d
cb241d822f3ecae077ff51e1d3c953d4
Abbott, N (University of WisconsinMadison )
Thursday 13 June 2013, 16:0017:30
Abbott, N (University of WisconsinMadison )
Thursday 13 June 2013, 16:0017:30
Cambridge University
4380
http://sms.cam.ac.uk/media/1499037
EndotoxinInduced Ordering Transitions in Liquid Crystalline Droplets
Abbott, N (University of WisconsinMadison )
Thursday 13 June 2013, 16:0017:30
This is a remote lecture, from Wisconsin.
20130614T14:04:39+01:00
4380
1499037
true
4x3
false
no

Energies and Shear Moduli in Nematic Elastomers
ucs_sms_1383776_1489775
http://sms.cam.ac.uk/media/1489775
Energies and Shear Moduli in Nematic Elastomers
DeSimone, A (SISSA)
Thursday 23 May 2013, 11:0012:00
Wed, 29 May 2013 09:49:28 +0100
Isaac Newton Institute
DeSimone, A
e948cc50a00564e68f003c43dbd0fd59
66981789b586da482e31fdd6727c63c3
135a22bf0cb6d720446877ce55863acf
64bff97fc50b225731d4e2d2d021b0f0
DeSimone, A (SISSA)
Thursday 23 May 2013, 11:0012:00
DeSimone, A (SISSA)
Thursday 23 May 2013, 11:0012:00
Cambridge University
3840
http://sms.cam.ac.uk/media/1489775
Energies and Shear Moduli in Nematic Elastomers
DeSimone, A (SISSA)
Thursday 23 May 2013, 11:0012:00
20130529T09:49:54+01:00
3840
1489775
true
16x9
false
no

Equivariant normal forms via the Moser trick
ucs_sms_1383776_1481383
http://sms.cam.ac.uk/media/1481383
Equivariant normal forms via the Moser trick
Robbins, J (University of Bristol)
Thursday 25 April 2013, 11:0012:00
Tue, 14 May 2013 13:50:15 +0100
Isaac Newton Institute
Robbins, J
8a206a7b26d1e673359c0ad42490ee26
ca870d47d92db6ede3176e6fc1f6aeb8
98fd431b09a07e572cd70f3ca1e8b556
2873cc9cd2d97c9a482cb1f997cafb4a
Robbins, J (University of Bristol)
Thursday 25 April 2013, 11:0012:00
Robbins, J (University of Bristol)
Thursday 25 April 2013, 11:0012:00
Cambridge University
2777
http://sms.cam.ac.uk/media/1481383
Equivariant normal forms via the Moser trick
Robbins, J (University of Bristol)
Thursday 25 April 2013, 11:0012:00
As is well known, phase transitions in Landau theory are described by bifurcations of critical points of the free energy. Phase transitions can be most easily analysed for certain normal forms, which contain a small number of essential terms. One would like to know when a given free energy can be brought into a normal form, locally at least, by a nearidentity change of variables. If the free energy possesses some symmetries, then one would like this change of variables to preserve these symmetries.
Using as an example a free energy for biaxial nematic liquid crystals, I will discuss an approach to normal form transformations using Moser's trick. The Moser trick reduces the nonlinear problem to a linear one through the determination of the generator of a oneparameter family of transformations linking the identity to the required transformation.
20130514T13:50:38+01:00
2777
1481383
true
4x3
false
no

Existence and uniqueness of the radial hedgehog in Landaude Gennes model
ucs_sms_1383776_1499019
http://sms.cam.ac.uk/media/1499019
Existence and uniqueness of the radial hedgehog in Landaude Gennes model
Nguyen, L (Princeton University)
Tuesday 11 June 2013, 14:0015:00
Fri, 14 Jun 2013 13:46:43 +0100
Isaac Newton Institute
Nguyen, L
58350f3bb2da728933801614971d8080
52198dcc924473fe8d0eaf2a3927003a
e01b213925b2acd099b5a822568a916c
854d0c964864ca4d12f99f033511d5c2
Nguyen, L (Princeton University)
Tuesday 11 June 2013, 14:0015:00
Nguyen, L (Princeton University)
Tuesday 11 June 2013, 14:0015:00
Cambridge University
2891
http://sms.cam.ac.uk/media/1499019
Existence and uniqueness of the radial hedgehog in Landaude Gennes model
Nguyen, L (Princeton University)
Tuesday 11 June 2013, 14:0015:00
In the satellite meeting in Oxford in April, V. Slastikov reported on our joint work with R. Ignat and A. Zarnescu on the stability/instability of the radial hedgehog in the context of Landaude Gennes theory. In this talk we discuss the existence and uniqueness of such solution. A comparison principle for (singular) nonlinear and radially symmetric elliptic equations will also be presented.
20130614T13:47:10+01:00
2891
1499019
true
16x9
false
no

Exotic defect structures in a strongly confined chiral liquid crystal
ucs_sms_1383776_1510831
http://sms.cam.ac.uk/media/1510831
Exotic defect structures in a strongly confined chiral liquid crystal
Fukuda, J (AIST)
Monday 24 June 2013, 12:0012:45
Wed, 03 Jul 2013 08:58:50 +0100
Isaac Newton Institute
Fukuda, J
90f7014bd797262d05ba0104d738e485
a4a2976d6f9d96f03cb03e3874cbffe5
dfe258b4b8bad3ef1d3f8e5272e9a7bd
38b8e7962c2f7e5d833d68c93053e1c8
Fukuda, J (AIST)
Monday 24 June 2013, 12:0012:45
Fukuda, J (AIST)
Monday 24 June 2013, 12:0012:45
Cambridge University
2450
http://sms.cam.ac.uk/media/1510831
Exotic defect structures in a strongly confined chiral liquid crystal
Fukuda, J (AIST)
Monday 24 June 2013, 12:0012:45
We present our numerical results on the structures of a chiral nematic liquid crystal when it is confined in a thin planar cell with strong anchoring on its surfaces. We are interested in the cases where the liquid crystal exhibit a cholesteric blue phase under no confinement, and the cell thickness is of the order of or smaller than the cholesteric pitch. We show various stable exotic defect structures depending on temperature, cell thickness, and the type of anchoring. They include a hexagonal lattice of Skyrmion excitations, and a regular array of ring defects. These exotic defect structures can be regarded as a result of frustrations between bulk blue phase ordering and surface anchoring that does not allow it.
20130703T17:25:52+01:00
2450
1510831
true
16x9
false
no

Facets of Order in Liquid Crystalline Vesicles
ucs_sms_1383776_1476852
http://sms.cam.ac.uk/media/1476852
Facets of Order in Liquid Crystalline Vesicles
Bowick, M (Syracuse University)
Tuesday 30 April 2013, 14:0015:00
Wed, 08 May 2013 15:04:19 +0100
Steve Greenham
Isaac Newton Institute
Bowick, M
c94165daa19283aa50dbab0e19742604
1c001a8db597356f38ee758a870a9de7
532b8ef110423562a06b53a8d6acd052
58f1c6213fd336fdef596aab55568d3a
Bowick, M (Syracuse University)
Tuesday 30 April 2013, 14:0015:00
Bowick, M (Syracuse University)
Tuesday 30 April 2013, 14:0015:00
Cambridge University
3780
http://sms.cam.ac.uk/media/1476852
Facets of Order in Liquid Crystalline Vesicles
Bowick, M (Syracuse University)
Tuesday 30 April 2013, 14:0015:00
The shape of liquidcrystalline vesicles, molecularly thin membrane sacs enclosing a finite volume, is determined by the competition between liquidcrystalline deformations on a surface to be determined and the bending energy of the surface in the ambient bulk. We analyze this problem in two limits: stiff (high bending rigidity compared to Frank modulus) and floppy (low bending energy compared to Frank modulus). The solution in the floppy limit is quite remarkable: it is the surface of a regular tetrahedron with topological defects at the vertices. Thus floppy liquid crystalline vesicles, which have no translational order, are sharp faceted structures more commonly found in hard crystalline materials.
20130508T15:04:44+01:00
3780
1476852
true
16x9
false
no

Ferronematic and ferroelectric liquid crystal colloids
ucs_sms_1383776_1481319
http://sms.cam.ac.uk/media/1481319
Ferronematic and ferroelectric liquid crystal colloids
Sluckin, T (University of Southampton)
Tuesday 23 April 2013, 15:0016:00
Tue, 14 May 2013 12:45:57 +0100
Isaac Newton Institute
Sluckin, T
9e3bee7a7883d3f7534b73ca6f789aae
ef01fd53811de98079490c99ed7f0aa4
add2a25fb23be94af35d15dab86991d1
4cb57184df8c9aa936e26c757429e42f
Sluckin, T (University of Southampton)
Tuesday 23 April 2013, 15:0016:00
Sluckin, T (University of Southampton)
Tuesday 23 April 2013, 15:0016:00
Cambridge University
4440
http://sms.cam.ac.uk/media/1481319
Ferronematic and ferroelectric liquid crystal colloids
Sluckin, T (University of Southampton)
Tuesday 23 April 2013, 15:0016:00
20130514T12:46:28+01:00
4440
1481319
true
4x3
false
no

Field instabilities of Smectic A liquid crystals in 2D and 3D
ucs_sms_1383776_1466938
http://sms.cam.ac.uk/media/1466938
Field instabilities of Smectic A liquid crystals in 2D and 3D
Joo, S (Old Dominion University)
Monday 08 April 2013, 16:0016:30
Tue, 23 Apr 2013 09:28:15 +0100
Isaac Newton Institute
Joo, S
acf6efd3f1ab327ac403e44d025fed41
30100c38d73fb63f86c3e7146701d08f
3bae3ee0035bf0214e3dc370bbe1c7b6
5104f1413b684cf84a3466b000abe41b
Joo, S (Old Dominion University)
Monday 08 April 2013, 16:0016:30
Joo, S (Old Dominion University)
Monday 08 April 2013, 16:0016:30
Cambridge University
2005
http://sms.cam.ac.uk/media/1466938
Field instabilities of Smectic A liquid crystals in 2D and 3D
Joo, S (Old Dominion University)
Monday 08 April 2013, 16:0016:30
20130423T09:28:36+01:00
2005
1466938
true
4x3
false
no

Flashing Flexodomains and Electroconvection Rolls in a Nematic Liquid Crystal
ucs_sms_1383776_1517023
http://sms.cam.ac.uk/media/1517023
Flashing Flexodomains and Electroconvection Rolls in a Nematic Liquid Crystal
Salamon, P (Wigner Research Centre for Physics)
Friday 05 July 2013, 12:1512:30
Thu, 11 Jul 2013 13:14:29 +0100
Isaac Newton Institute
Salamon, P
69885b63660ebd9962435844367fbe63
05014373a522bf21cdd42a934e1f1428
711fb0e0967cf365e4d117fdad53bc5d
4d70f2f710a64fc73bdcd88fd0816a5e
Salamon, P (Wigner Research Centre for Physics)
Friday 05 July 2013,...
Salamon, P (Wigner Research Centre for Physics)
Friday 05 July 2013, 12:1512:30
Cambridge University
905
http://sms.cam.ac.uk/media/1517023
Flashing Flexodomains and Electroconvection Rolls in a Nematic Liquid Crystal
Salamon, P (Wigner Research Centre for Physics)
Friday 05 July 2013, 12:1512:30
20130711T13:14:58+01:00
905
1517023
true
16x9
false
no

Fluctuations and nonlinear elasticity of nematic elastomers
ucs_sms_1383776_1509177
http://sms.cam.ac.uk/media/1509177
Fluctuations and nonlinear elasticity of nematic elastomers
Xing, X (Shanghai Jiao Tong University)
Thursday 27 June 2013, 11:0011:45
Mon, 01 Jul 2013 12:56:03 +0100
Isaac Newton Institute
Xing, X
9ca249f9d4ef77ec08d0e725469efd84
77423bcd484ac9a8c655272481dd0e10
645940c8dbcba6f6f43d1ebdc1c23150
fe8b34e43a4c02bb49c2dba5b74f4426
Xing, X (Shanghai Jiao Tong University)
Thursday 27 June 2013, 11:0011:45
Xing, X (Shanghai Jiao Tong University)
Thursday 27 June 2013, 11:0011:45
Cambridge University
2728
http://sms.cam.ac.uk/media/1509177
Fluctuations and nonlinear elasticity of nematic elastomers
Xing, X (Shanghai Jiao Tong University)
Thursday 27 June 2013, 11:0011:45
In this talk, I will first discuss how to describe elastic deformations in systems with partial translational orders and orientational orders. I will then discuss how to incorporate the effects of thermal and quenched fluctuations into elasticity theory. Finally I will address the anomalous elasticity of ideal nematic elastomers in presence of thermal as well as quenched fluctuations.
20130701T17:55:43+01:00
2728
1509177
true
16x9
false
no

Fluids with attitude
ucs_sms_1383776_1383777
http://sms.cam.ac.uk/media/1383777
Fluids with attitude
Sluckin, T (University of Southampton)
Monday 07 January 2013, 10:0011:00
Thu, 10 Jan 2013 17:48:50 +0000
Isaac Newton Institute
Sluckin, T
b7a8e9c15726ca07d7558ace510e171d
f012c1699d46b15860180b45eb12be37
ed39a8eb8b6ef9cac1c2cac96e2b871b
69323c064448291dbaa4e55c08f393d8
5c6d45a50a085db3c288768368985590
Sluckin, T (University of Southampton)
Monday 07 January 2013, 10:0011:00
Sluckin, T (University of Southampton)
Monday 07 January 2013, 10:0011:00
Cambridge University
3784
http://sms.cam.ac.uk/media/1383777
Fluids with attitude
Sluckin, T (University of Southampton)
Monday 07 January 2013, 10:0011:00
This talk includes: an account of the early development of liquid crystal science (c18881940), a history of key mathematical ideas, a discussion of devices in liquid crystals, and finally a personal view of future perspectives.
Friedrich Reinitzer (1888, Prague) found that cholesteryl benzoate exhibited two fluid phases, one of which was cloudy. Otto Lehmann (Karlsruhe) studied similar compounds, which seemed both liquid and crystal, hence the term “liquid crystal”. In France Georges Friedel (1922) realised that liquid crystals were instead orientationally ordered fluids, inventing the terms “nematic”, “smectic” and “cholesteric”. The first (“swarm”) theory was due to Emil Bose (Danzig, 1908). More successful was the distinguished Swedish theoretical physicist Carl Wilhelm Oseen, who constructed a hydrostatic theory of liquid crystals (192244). Oseen’s theory explained Frederiks’s results from the USSR on threshold fields, but his Ph.D. student Adolf Anzelius was not able to build a consistent dynamical theory.
The first statistical mechanical theory was a mean field picture based on CurieWeiss magnetism, due to François Grandjean (France, 1917). His work was ignored. The later 1958 MaierSaupe theory is essentially identical. The liquid crystal order parameter is due to the Russian physicist Victor Tsvetkov in 1941.
Liquid crystal devices emerged in the USA in the 1960s. The TN cell was patented in 1970. There remains dispute over its discovery. Device development was accompanied by enormous theoretical and mathematical activity. The current hydrodynamic theory due to Ericksen and Leslie in 1966, and the Landau theory due to de Gennes in 1970, have been immensely influential. The importance of lcd’s has focussed mathematical interest in liquid crystals in recent years, but in the future these ideas may be even more important in understanding processes in living cells.
20130110T17:49:12+00:00
3784
1383777
true
16x9
false
no

Foundations and derivations of the popular molecular theories of nematics including MaierSaupe, Onsager and Density functional ones
ucs_sms_1383776_1458678
http://sms.cam.ac.uk/media/1458678
Foundations and derivations of the popular molecular theories of nematics including MaierSaupe, Onsager and Density functional ones
Osipov, M (University of Strathclyde)
Thursday 28 March 2013, 11:0012:00
Thu, 11 Apr 2013 10:22:34 +0100
Isaac Newton Institute
Osipov, M
bcc6adaabd806e17089c88a372c3de84
9fddefbc6dc319691ff469775b7f6881
1a3b7280c669fafc7508a7b15b67834f
72485206ea3923743b25475b503478a8
Osipov, M (University of Strathclyde)
Thursday 28 March 2013, 11:0012:00
Osipov, M (University of Strathclyde)
Thursday 28 March 2013, 11:0012:00
Cambridge University
4560
http://sms.cam.ac.uk/media/1458678
Foundations and derivations of the popular molecular theories of nematics including MaierSaupe, Onsager and Density functional ones
Osipov, M (University of Strathclyde)
Thursday 28 March 2013, 11:0012:00
20130411T10:22:55+01:00
4560
1458678
true
4x3
false
no

Free energy according to Poincare' and Landau
ucs_sms_1383776_1388370
http://sms.cam.ac.uk/media/1388370
Free energy according to Poincare' and Landau
Gaeta, G (Universita' di Milano)
Friday 11 January 2013, 10:2011:00
Wed, 16 Jan 2013 13:38:47 +0000
Isaac Newton Institute
Gaeta, G
d807335a8f3041bf30df19b87331a5a7
bb66d4ed717e5ab1af1feac5a61391b7
70cc49b574f61d1a77ca03bfeacc6e68
490ac03c589e154f5a9d0d973bd28c66
030d51c378ce9fb9f8669eb6585dbf79
Gaeta, G (Universita' di Milano)
Friday 11 January 2013, 10:2011:00
Gaeta, G (Universita' di Milano)
Friday 11 January 2013, 10:2011:00
Cambridge University
2272
http://sms.cam.ac.uk/media/1388370
Free energy according to Poincare' and Landau
Gaeta, G (Universita' di Milano)
Friday 11 January 2013, 10:2011:00
In the Landau theory of phase transitions one considers an effective potential U whose symmetry group G and degree d depend on the system under consideration; generally speaking, U is the most general Ginvariant polynomial of degree d. When such a U turns out to be too complicate for a direct analysis, it is essential to be able to drop unessential terms, i.e., to apply a simplifying criterion. Criteria based on singularity theory exist and have a rigorous foundation, but are often very difficult to apply in practice. Here we consider a simplifying criterion and rigorously justify it on the basis of classical LiePoincare theory; this builds on (and justifies) a proposal by Gufan.
20130116T13:39:06+00:00
2272
1388370
true
16x9
false
no

From molecular symmetry to order parameters
ucs_sms_1383776_1388291
http://sms.cam.ac.uk/media/1388291
From molecular symmetry to order parameters
Zhang, P (Peking University)
Friday 11 January 2013, 09:0009:40
Wed, 16 Jan 2013 12:46:35 +0000
Isaac Newton Institute
Zhang, P
53095d481a99589ba5a04b0069c56eec
1f1269d64d57913dfffa3d74a134cb33
086c37a1526a2696b11cba75bc34e26c
e6bbdc09d67b84e7410de92a06f8e149
217b5ff42884852bdca51ca0e0ff47c6
Zhang, P (Peking University)
Friday 11 January 2013, 09:0009:40
Zhang, P (Peking University)
Friday 11 January 2013, 09:0009:40
Cambridge University
2636
http://sms.cam.ac.uk/media/1388291
From molecular symmetry to order parameters
Zhang, P (Peking University)
Friday 11 January 2013, 09:0009:40
We propose a systematic molecular modeling of liquid crystals, the models can be used to depict isotropic, nematic, smectic, columnar, cholesterics and blue phases. The tensor model can be reduced from molecular model using closure and Taylor expansion, the vector model can be reduced from tensor or molecular model using axial symmetry assumption. Using Newton mechanic and virial expansion, we build a generic molecular model to describe phase behaviors of rigid molecules of arbitrary shape. The system is characterized by a pairwise kernel function. The kernel function can be simplified by the molecular symmetry. Onsager potential is a leading order for rodlike molecular using hard core potential, and MaierSaupe potential is a good second approximation using Lennard Jones potential. The new models including simplified kernel functions are proposed for bentcore molecules and other shape molecules. We also clarify the criteria of choosing order parameters, both from theoretical aspects and from results of experiments and simulations. According to these criteria, we explain why the eigenvalue of second moment is chosen to describe spatially homogeneous phases of rodlike molecules, and predict the choice of order parameters for bentcore molecules and other molecules of different symmetries. The rigorous analysis for choosing the order parameter will be given for MaierSaupe model of rodlike molecular.
20130116T12:46:55+00:00
2636
1388291
true
16x9
false
no

Function spaces and liquid crystals
ucs_sms_1383776_1387392
http://sms.cam.ac.uk/media/1387392
Function spaces and liquid crystals
Ball, J (University of Oxford)
Wednesday 09 January 2013, 09:0010:00
Tue, 15 Jan 2013 13:24:06 +0000
Isaac Newton Institute
Ball, J
92b164bfce1e3c81ebd13cd3b5893bdd
d805f308063f6680f46fe202b5e4bee0
c22ffa3cf0788e4e8336a266eaea2db0
2238e28bafeecb49177dfd8b4db47c8d
3574ed7a83795896f5f7f587587ca6b2
Ball, J (University of Oxford)
Wednesday 09 January 2013, 09:0010:00
Ball, J (University of Oxford)
Wednesday 09 January 2013, 09:0010:00
Cambridge University
3594
http://sms.cam.ac.uk/media/1387392
Function spaces and liquid crystals
Ball, J (University of Oxford)
Wednesday 09 January 2013, 09:0010:00
Function spaces are an essential part of mathematical models of nature, specifying allowed singularities in solutions. The talk will discuss the definition and roles of function spaces appropriate for liquid crystals, how they influence the description of defects, and their interaction with boundary conditions and topology.
20130116T15:54:10+00:00
3594
1387392
true
16x9
false
no

Geometric theories of conservative liquid crystal dynamics
ucs_sms_1383776_1387920
http://sms.cam.ac.uk/media/1387920
Geometric theories of conservative liquid crystal dynamics
Ratiu, T (EPFL  Ecole Polytechnique Fédérale de Lausanne)
Wednesday 09 January 2013, 16:0017:00
Wed, 16 Jan 2013 09:24:55 +0000
Isaac Newton Institute
Ratiu, T
989e226ee7a40f1d2c05ef1a179186a2
ef2b51278177ae392dd96b3789f39893
1de262bda8d767c1b0c45aaa015e8a92
6a1d4afad56743385c1ee2b0cef374cd
a0b232f3b26ac1ee13b5728acdfdb124
Ratiu, T (EPFL  Ecole Polytechnique Fédérale de Lausanne)
Wednesday 09...
Ratiu, T (EPFL  Ecole Polytechnique Fédérale de Lausanne)
Wednesday 09 January 2013, 16:0017:00
Cambridge University
3720
http://sms.cam.ac.uk/media/1387920
Geometric theories of conservative liquid crystal dynamics
Ratiu, T (EPFL  Ecole Polytechnique Fédérale de Lausanne)
Wednesday 09 January 2013, 16:0017:00
20130116T09:25:15+00:00
3720
1387920
true
16x9
false
no

Glassy dynamics, spinodal fluctuations, and nucleation in suspensions of colloidal hard rods and plates
ucs_sms_1383776_1443261
http://sms.cam.ac.uk/media/1443261
Glassy dynamics, spinodal fluctuations, and nucleation in suspensions of colloidal hard rods and plates
Dijkstra, M (Universiteit Utrecht)
Wednesday 20 March 2013, 09:0009:50
Wed, 20 Mar 2013 17:08:40 +0000
Isaac Newton Institute
Dijkstra, M
5d740a7313ecdd36aaf563a18f57e2d0
fc38625333ff6d8f5f5e4f250b56cd1b
87c7cb848f5193f2d5a15d4150f92431
065f8526cb515a502b9d42a969508df3
Dijkstra, M (Universiteit Utrecht)
Wednesday 20 March 2013, 09:0009:50
Dijkstra, M (Universiteit Utrecht)
Wednesday 20 March 2013, 09:0009:50
Cambridge University
2365
http://sms.cam.ac.uk/media/1443261
Glassy dynamics, spinodal fluctuations, and nucleation in suspensions of colloidal hard rods and plates
Dijkstra, M (Universiteit Utrecht)
Wednesday 20 March 2013, 09:0009:50
Using computer simulations we study nucleation in a colloidal supension of hard rods. We study the kinetic pathways for the isotropictonematic transition in a fluid of long hard rods, and find spinodal decomposition as well as nucleation and growth depending on the supersaturation [1]. In supersaturated isotropic fluid states of short hard rods, we observe nucleation of multilayered crystalline clusters. At sufficiently high supersaturations, we find that the nucleation is hampered by glassy dynamics. For intermediat rods, we find that the formation of the (stable) smectic phase out of a supersaturated isotropic state is strongly suppressed by an isotropicnematic spinodal instability that causes huge spinodallike orientation fluctuations with nematic clusters diverging in size [2]. In suspensions of colloidal platelets, we find that the cubatic phase is metastable, and that perpendicularly oriented particle stacks in the isotropic fluid phase inhibits the formation of the columnar phase [3].
[1] A. Cuetos and M. Dijkstra, Physical Review Letters 98, 095701 (2007). [2] R. Ni, S. Belli, R. van Roij, and M. Dijkstra, Physical Review Letters 105, 088302 (2010). [3] M. Marechal, A. Patti, M. Dennison, and M. Dijkstra, Physical Review Letters 108, 206101 (2012).
20130320T17:09:03+00:00
2365
1443261
true
16x9
false
no

Hard and soft elasticity of polydomain liquid crystal elastomers
ucs_sms_1383776_1509085
http://sms.cam.ac.uk/media/1509085
Hard and soft elasticity of polydomain liquid crystal elastomers
Biggins, J (University of Cambridge)
Thursday 27 June 2013, 09:0009:45
Mon, 01 Jul 2013 12:06:13 +0100
Isaac Newton Institute
Biggins, J
7e389f92b6062e022d4824e644696c17
ef2b81cdbf16d06d8431653c06e257d0
f21d3f3121adccf53f83262c432b5c3b
a914864007d779e01fbd40b6d4519f51
Biggins, J (University of Cambridge)
Thursday 27 June 2013, 09:0009:45
Biggins, J (University of Cambridge)
Thursday 27 June 2013, 09:0009:45
Cambridge University
2749
http://sms.cam.ac.uk/media/1509085
Hard and soft elasticity of polydomain liquid crystal elastomers
Biggins, J (University of Cambridge)
Thursday 27 June 2013, 09:0009:45
Liquid crystal elastomers are solids that resist deformation with an elastic modulus appropriate for rubber. However, some special large deformations that induce the liquidcrystal order to rotate though the elastomer can be imposed at almost zero stress. These deformations are said to be soft. Soft elasticity is now well understood in monodomain liquid crystal elastomers (in which the liquid crystal order points in the same direction throughout the sample) but such samples are rather difficult to prepare, especially in anything but a thin film. If a liquid crystal polymer is simply crosslinked to make an elastomer, the results will be a polydomain. We model each domain of a polydomain as a small monodomain and ask whether such polydomains exhibit global soft elasticity. We show that the fabrication history of the sample is critical. Elstomers crosslinked in an isotropic state then cooled to a nematic state whilst a solid have global soft modes while those cooled to a nematic state then crosslinked do not. The addition of smectic phases allows more complicated fabrication histories with a variety of soft and hard behaviour. Finally, I will consider whether any of these polydomains can be used to build actuators.
20130701T15:37:54+01:00
2749
1509085
true
16x9
false
no

Hard core effects in mean field theories
ucs_sms_1383776_1387357
http://sms.cam.ac.uk/media/1387357
Hard core effects in mean field theories
Sonnet, AM (University of Strathclyde)
Tuesday 08 January 2013, 17:3018:30
Tue, 15 Jan 2013 12:41:26 +0000
Isaac Newton Institute
Sonnet, AM
41b54a6f76069588cc4f742a31590679
55d5508cf3e8661157c39df073b51f92
6a649dc3e5a5d2122791ad172cc2f5d2
8cd9d157c8d51399ee493649cd8c93f6
ce0d0e540b52110b1c0e3b5af0299d79
Sonnet, AM (University of Strathclyde)
Tuesday 08 January 2013, 17:3018:30
Sonnet, AM (University of Strathclyde)
Tuesday 08 January 2013, 17:3018:30
Cambridge University
2702
http://sms.cam.ac.uk/media/1387357
Hard core effects in mean field theories
Sonnet, AM (University of Strathclyde)
Tuesday 08 January 2013, 17:3018:30
Classically, there have been two different ways to obtain mean field theories for liquid crystals. One is based on short range repulsive forces and the other on long range electrostatic forces. In the former approach, it is the anisotropic shape of the molecules that leads to the anisotropic interaction, and in the latter it is the anisotropy of the molecular charge distribution. In real molecules, both causes of anisotropy will be present and can be expected to contribute to the effective interaction. It is thus desirable to assess the combined effect of anisotropic long range attraction and short range repulsion.
Starting from a long range intermolecular interaction energy, a mean field pair potential can be obtained by averaging over all possible relative positions of two molecules in a fixed relative orientation. The effects of hard core repulsion can be taken into account by an appropriate choice of the domain of integration for the averaging. This involves determining an excluded region, the region that one molecule cannot penetrate due to the hard core repulsion exerted by the other.
20130116T15:54:34+00:00
2702
1387357
true
16x9
false
no

Hierarchical active matter: from extensible bundles to active gels, streaming liquid crystals and motile emulsions
ucs_sms_1383776_1507605
http://sms.cam.ac.uk/media/1507605
Hierarchical active matter: from extensible bundles to active gels, streaming liquid crystals and motile emulsions
Dogic, Z (Brandeis University)
Tuesday 25 June 2013, 14:4515:30
Fri, 28 Jun 2013 16:06:29 +0100
Isaac Newton Institute
Dogic, Z
e68c2f405bd744293ff285db81353f5d
c1ad15c6f15cea379279299669b7b586
b349bf52a75bf4ae29bb143d44014991
4ca72716505365deadb0a46eddfc2eb8
Dogic, Z (Brandeis University)
Tuesday 25 June 2013, 14:4515:30
Dogic, Z (Brandeis University)
Tuesday 25 June 2013, 14:4515:30
Cambridge University
2669
http://sms.cam.ac.uk/media/1507605
Hierarchical active matter: from extensible bundles to active gels, streaming liquid crystals and motile emulsions
Dogic, Z (Brandeis University)
Tuesday 25 June 2013, 14:4515:30
The emerging field of active matter promises an entirely new category of materials, with highly sought after properties such as autonomous motility and internally generated flows. In this vein, I will describe recent experiments that have focused on reconstituting dynamical structures from purified biochemical components. In particular I will describe recent advances that include: (1) assembly of a minimal model of synthetic cilia capable of generating periodic beating patterns, and conditions under which they exhibit metachronal traveling waves, (2) study of 2D active nematic liquid crystals whose streaming flows are determined by internal fractures and selfhealing as well as spontaneous unbinding and recombination of oppositely charged disclination defects, (3) reconstitution of active gels characterized by highly tunable and controllable spontaneous internal flows, and (4) assembly of active emulsions in which aqueous droplets spontaneously crawl when in contact with a hard wall.
20130628T17:56:07+01:00
2669
1507605
true
16x9
false
no

Hydrodynamic description of thin nematic films
ucs_sms_1383776_1487010
http://sms.cam.ac.uk/media/1487010
Hydrodynamic description of thin nematic films
Lin, TS (Loughborough)
Tuesday 21 May 2013, 11:3011:50
Fri, 24 May 2013 10:20:05 +0100
Isaac Newton Institute
Lin, TS
0993fd740b4d0721918149d9f2a9535a
0b70c6de4bb3e597b18568a9c8ef215e
803bf3383dcaf23aec49e252a7017adf
038e269a7741ec4346adb81264067be8
Lin, TS (Loughborough)
Tuesday 21 May 2013, 11:3011:50
Lin, TS (Loughborough)
Tuesday 21 May 2013, 11:3011:50
Cambridge University
1077
http://sms.cam.ac.uk/media/1487010
Hydrodynamic description of thin nematic films
Lin, TS (Loughborough)
Tuesday 21 May 2013, 11:3011:50
We discuss the longwave hydrodynamic model for a thin film of nematic liquid crystal. Firstly, we clarify how the elastic energy enters the evolution equation for the film thickness. We show that the longwave model derived through an asymptotic expansion of the full nematohydrodynamic equations with consistent boundary conditions agrees with the model one obtains by employing a thermodynamically motivated gradient dynamics formulation based on an underlying free energy functional. As a result, we find that in the case of strong anchoring the elastic distortion energy is always stabilising. Secondly, based on a gradient dynamics approach, we propose a film thickness evolution equation that describes a free surface thin film of nematic liquid crystals on a solid substrate under weak anchoring conditions at the free surface. We show that in the intermediate film thickness range anchoring and bulk energies compete what may result in a linear instability of the free surfa ce of the film.
20130524T10:20:29+01:00
1077
1487010
true
16x9
false
no

Hyperbolic geometry in liquid crystalline interfaces
ucs_sms_1383776_1508817
http://sms.cam.ac.uk/media/1508817
Hyperbolic geometry in liquid crystalline interfaces
Giomi, L (SISSA)
Wednesday 26 June 2013, 09:4510:30
Mon, 01 Jul 2013 08:55:16 +0100
Isaac Newton Institute
Giomi, L
42eaf3629446daac754ab99ad06d2326
f0d02d395f97178d6a8cb39592994363
ae405b2907c6154dd9609e720de3be47
3f049ae56a612208864f7620a9410528
Giomi, L (SISSA)
Wednesday 26 June 2013, 09:4510:30
Giomi, L (SISSA)
Wednesday 26 June 2013, 09:4510:30
Cambridge University
2649
http://sms.cam.ac.uk/media/1508817
Hyperbolic geometry in liquid crystalline interfaces
Giomi, L (SISSA)
Wednesday 26 June 2013, 09:4510:30
Fluid interfaces, such as soap films, liquid droplets, or lipid membranes, are known to give rise to several special geometries, whose complexity and beauty continue to fascinate us, as observers of the natural world, and challenge us as scientists. Here I show that a special class of surfaces of constant negative Gaussian curvature can be obtained in fluid interfaces equipped with an orientational ordered phase. These arise in various soft and biological materials, such as nematic liquid crystals, cytoskeletal assemblies, or hexatic colloidal suspensions. The purely hyperbolic morphology originates from the competition between surface tension, that reduces the area of the interface at the expense of increasing its Gaussian curvature, and the orientational elasticity of the ordered phase, that in turn suffers for the distortion induced by the underlying curvature.
20130701T13:20:59+01:00
2649
1508817
true
16x9
false
no

Informal workshop on groups, orbits and bifurcation
ucs_sms_1383776_1411181
http://sms.cam.ac.uk/media/1411181
Informal workshop on groups, orbits and bifurcation
Dawes, J
Thursday 14 February 2013, 11:0012:00
Fri, 15 Feb 2013 14:17:09 +0000
Isaac Newton Institute
Dawes, J
08da2bdbd093c4ee2a0bd1a573f7d822
5fd1dd64444736c6e8fb7a6d8d994934
d614942b03d984b38a985fedae4c8545
88650ed1a5e4d80ab1c10b8886249a5e
Dawes, J
Thursday 14 February 2013, 11:0012:00
Dawes, J
Thursday 14 February 2013, 11:0012:00
Cambridge University
5760
http://sms.cam.ac.uk/media/1411181
Informal workshop on groups, orbits and bifurcation
Dawes, J
Thursday 14 February 2013, 11:0012:00
20130215T14:17:34+00:00
5760
1411181
true
16x9
false
no

Informal workshop on groups, orbits and bifurcation I
ucs_sms_1383776_1406688
http://sms.cam.ac.uk/media/1406688
Informal workshop on groups, orbits and bifurcation I
Dawes, J (University of Bath)
Tuesday 29 January 2013, 16:0017:00
Fri, 08 Feb 2013 15:28:43 +0000
Isaac Newton Institute
Dawes, J
4b91a079c071b4b35dbedecc1bbd7585
980ec4b85412f2ff130d99cd120e3e61
5056fd3d5761533dc56cd52581ae7a83
434c0300b05075b46e9b2ea4ad9b5665
Dawes, J (University of Bath)
Tuesday 29 January 2013, 16:0017:00
Dawes, J (University of Bath)
Tuesday 29 January 2013, 16:0017:00
Cambridge University
3452
http://sms.cam.ac.uk/media/1406688
Informal workshop on groups, orbits and bifurcation I
Dawes, J (University of Bath)
Tuesday 29 January 2013, 16:0017:00
20130208T15:29:03+00:00
3452
1406688
true
16x9
false
no

Informal workshop on groups, orbits and bifurcation II
ucs_sms_1383776_1406704
http://sms.cam.ac.uk/media/1406704
Informal workshop on groups, orbits and bifurcation II
Dawes, J (University of Bath)
Friday 01 February 2013, 11:0012:00
Fri, 08 Feb 2013 15:53:01 +0000
Isaac Newton Institute
Dawes, J
e9d62720f1a44a01e0f0455d1ec4858a
e127311a01e89a27f6eb4d7a6d5794c6
b2321ebcf02e0b83f642d25e9709f1a9
0995047031362dcf098623b66d7fe6bb
Dawes, J (University of Bath)
Friday 01 February 2013, 11:0012:00
Dawes, J (University of Bath)
Friday 01 February 2013, 11:0012:00
Cambridge University
4560
http://sms.cam.ac.uk/media/1406704
Informal workshop on groups, orbits and bifurcation II
Dawes, J (University of Bath)
Friday 01 February 2013, 11:0012:00
20130208T15:53:23+00:00
4560
1406704
true
16x9
false
no

Informal workshop on Groups, Orbits and Bifurcation III
ucs_sms_1383776_1408160
http://sms.cam.ac.uk/media/1408160
Informal workshop on Groups, Orbits and Bifurcation III
Lauterbach, R (Universität Hamburg)
Thursday 07 February 2013, 16:0017:00
Mon, 11 Feb 2013 15:47:09 +0000
Isaac Newton Institute
Lauterbach, R
3932ca51642ce810e3c98a03d114c6c2
724ca6519e0f641d21233d34cc587e3a
3e04c89accae04faad6cc3b9aa5bd978
f88930e878ab66c0c8dab6b5892039f8
Lauterbach, R (Universität Hamburg)
Thursday 07 February 2013, 16:0017:00
Lauterbach, R (Universität Hamburg)
Thursday 07 February 2013, 16:0017:00
Cambridge University
5100
http://sms.cam.ac.uk/media/1408160
Informal workshop on Groups, Orbits and Bifurcation III
Lauterbach, R (Universität Hamburg)
Thursday 07 February 2013, 16:0017:00
20130211T15:47:43+00:00
5100
1408160
true
4x3
false
no

Interfacial motion in flexo and orderelectric switching between nematic filled states
ucs_sms_1383776_1487129
http://sms.cam.ac.uk/media/1487129
Interfacial motion in flexo and orderelectric switching between nematic filled states
Blow, M (Lisbon)
Tuesday 21 May 2013, 13:3013:50
Fri, 24 May 2013 11:52:25 +0100
Isaac Newton Institute
Blow, M
d13ba309e4a873f9f32853ebebe2090f
ce671f0973bfeb501a6d113f0dff61e1
f06b8a6608a5954714363ec946d63872
2b1827778051125b4079a3d2244e63b5
Blow, M (Lisbon)
Tuesday 21 May 2013, 13:3013:50
Blow, M (Lisbon)
Tuesday 21 May 2013, 13:3013:50
Cambridge University
962
http://sms.cam.ac.uk/media/1487129
Interfacial motion in flexo and orderelectric switching between nematic filled states
Blow, M (Lisbon)
Tuesday 21 May 2013, 13:3013:50
We consider a nematic liquid crystal, in coexistence with its isotropic phase, in contact with a substrate patterned with rectangular grooves. In such a system, the nematic phase may fill the grooves without the occurrence of complete wetting. There may exist multiple (meta)stable filled states, each characterised by the type of distortion (bend or splay) in each corner of the groove and by the shape of the nematicisotropic interface, and additionally the plateaux that separate the grooves may be either dry or wet with a thin layer of nematic. Using numerical simulations, we analyse the dynamical response of the system to an externallyapplied electric field, with the aim of identifying switching transitions between these filled states. We find that orderelectric coupling between the fluid and the field provides a means of switching between states where the plateaux between grooves are dry and states where they are wet by a nematic layer, without affecting the configu ration of the nematic within the groove. We find that flexoelectric coupling may change the nematic texture in the groove, provided that the flexoelectric coupling differentiates between the types of distortion at the corners of the substrate. We identify intermediate stages of the transitions, and the role played by the motion of the nematicisotropic interface. We determine quantitatively the field magnitudes and orientations required to effect each type of transition.
20130524T11:52:51+01:00
962
1487129
true
16x9
false
no

Invariant theory: a useful tool for equivariant dynamics and the mathematics of liquid crystals
ucs_sms_1383776_1388330
http://sms.cam.ac.uk/media/1388330
Invariant theory: a useful tool for equivariant dynamics and the mathematics of liquid crystals
Lauterbach, R (Universität Hamburg)
Friday 11 January 2013, 09:4010:20
Wed, 16 Jan 2013 13:12:17 +0000
Isaac Newton Institute
Lauterbach, R
b2b13c6faaf90144f3bbb537995b8535
c9057b1996c1553085df2a4d8325c776
5fd5d1980649d5c16e130c991225078d
de86e3c54cb73ba755bc4735a7571fcf
fe7fd0f1beb6fa235a9b5a8b9f76e001
Lauterbach, R (Universität Hamburg)
Friday 11 January 2013, 09:4010:20
Lauterbach, R (Universität Hamburg)
Friday 11 January 2013, 09:4010:20
Cambridge University
2749
http://sms.cam.ac.uk/media/1388330
Invariant theory: a useful tool for equivariant dynamics and the mathematics of liquid crystals
Lauterbach, R (Universität Hamburg)
Friday 11 January 2013, 09:4010:20
In this talk we will present some classical and modern results from invariant theory and and apply them to problems in equivariant dynamics and bifurcation and also to some problems in the theory of liquid crystals. We hope to identify and explain some problems where similar ideas are useful.
20130116T13:12:37+00:00
2749
1388330
true
16x9
false
no

Iridescent Films from Cellulose Nanocrystals
ucs_sms_1383776_1516965
http://sms.cam.ac.uk/media/1516965
Iridescent Films from Cellulose Nanocrystals
Dumanli, A.G (University of Cambridge)
Friday 05 July 2013, 11:3011:45
Thu, 11 Jul 2013 12:44:53 +0100
Isaac Newton Institute
Dumanli, A.G
4fb7f419666118e9a1cfb2cd5ecd9504
2b32d5442cfcee39c5314b6fe6e89f97
3d463189af492a5091431892204e043c
98f623ed35e8bedcc01792a9de4bf936
Dumanli, A.G (University of Cambridge)
Friday 05 July 2013, 11:3011:45
Dumanli, A.G (University of Cambridge)
Friday 05 July 2013, 11:3011:45
Cambridge University
944
http://sms.cam.ac.uk/media/1516965
Iridescent Films from Cellulose Nanocrystals
Dumanli, A.G (University of Cambridge)
Friday 05 July 2013, 11:3011:45
20130711T12:45:18+01:00
944
1516965
true
16x9
false
no

Isotropicpolar phase transition in an amphiphilic fluid
ucs_sms_1383776_1444331
http://sms.cam.ac.uk/media/1444331
Isotropicpolar phase transition in an amphiphilic fluid
Schoen, M (Technische Universität Berlin)
Thursday 21 March 2013, 09:5010:40
Fri, 22 Mar 2013 11:06:01 +0000
Isaac Newton Institute
Schoen, M
61dd9915724d61111c5500204faf5c80
f1c425aceeaab4a8c1d3fb89837e9ca6
8fe3d226376ab4b889e835bc1e7e9397
26547c969c9c6bebaf303f6918c20a3b
Schoen, M (Technische Universität Berlin)
Thursday 21 March 2013, 09:5010:40
Schoen, M (Technische Universität Berlin)
Thursday 21 March 2013, 09:5010:40
Cambridge University
3093
http://sms.cam.ac.uk/media/1444331
Isotropicpolar phase transition in an amphiphilic fluid
Schoen, M (Technische Universität Berlin)
Thursday 21 March 2013, 09:5010:40
We present Monte Carlo simulations of the isotropicpolar (IP) phase transition in an amphiphilic fluid carried out in the isothermalisobaric ensemble. Our model consists of LennardJones spheres where the attractive part of the potential is modified by an orientationdependent function. This function gives rise to an angle dependence of the intermolecular attractions corresponding to that characteristic of point dipoles. Our data show a substantial systemsize dependence of the dipolar order parameter. We analyze the systemsize dependence in terms of the orderparameter distribution and a cumulant involving its first and second moments. The order parameter, its distribution, and susceptibility observe the scaling behavior characteristic of the classical 3DHeisenberg universality class. Because of this scaling behavior and because all cumulants have a common intersection irrespective of system size we conclude that the IP phase transition is continuous. Considering pre ssures 1.3≤ P≤3.0 we demonstrate that a line of continuous phase transition exists which is analogous to the Curie line in systems exhibiting a ferroelectric transition. Our results are can be explained semiquantitatively by a simple meanfield theory adapted from the theory of IP phase transitions in fluids in which molecules carry an electromagnetic point dipole.
20130322T11:06:22+00:00
3093
1444331
true
16x9
false
no

Kinetics of LightInduced Patterning in Liquid Crystal Elastomers
ucs_sms_1383776_1517797
http://sms.cam.ac.uk/media/1517797
Kinetics of LightInduced Patterning in Liquid Crystal Elastomers
Copic, M (University of Ljubljana)
Friday 28 June 2013, 14:4515:30
Fri, 12 Jul 2013 16:09:48 +0100
Isaac Newton Institute
Copic, M
3f480febf2db7196b7fe542ff3bdee61
a3dcd195bd66d2bdd783e9106510b091
6d18a3f55fed21f16c32ad7730e57527
e12d4248d09afc0319541d17d103dd2e
Copic, M (University of Ljubljana)
Friday 28 June 2013, 14:4515:30
Copic, M (University of Ljubljana)
Friday 28 June 2013, 14:4515:30
Cambridge University
2516
http://sms.cam.ac.uk/media/1517797
Kinetics of LightInduced Patterning in Liquid Crystal Elastomers
Copic, M (University of Ljubljana)
Friday 28 June 2013, 14:4515:30
Liquid crystal elastomers doped with molecules that change conformation on absorption of a photon show very large changes photoelastic response. This can be investigated by recording a holographic grating in the material with the use of two crossed UV laser beams. Angular dependence of the diffraction efficiency in the vicinity of the Bragg peak can be analyzed using a numerical model that takes into account the propagation of writing beams and rate equations for the local concentration of the absorbing trans conformer, and spatial distribution of the trans and cis conformers can be obtained. Stress dependence on the irradiation time can be analyzed in a similar way. Strongly nonlinear relationship between the concentration of the cis isomers of the azomesogens and the refractive index modification of the material, which is characteristic for the phase transition region, results in nonmonotonous time dependence of the diffraction efficiency of a probe beam. From this effect the sensitivity of the nematic transition temperature on the molar fraction of the cis isomers is determined. The relation between the cis isomer molar fraction and nematic order also provides a possibility for recording hidden holograms, which can be made visible by cooling the sample from the paranematic to the nematic phase.
20130715T09:08:29+01:00
2516
1517797
true
16x9
false
no

Landau Theory for ''Mendeleev's'' Tables of Polar Smectic Structures
ucs_sms_1383776_1464729
http://sms.cam.ac.uk/media/1464729
Landau Theory for ''Mendeleev's'' Tables of Polar Smectic Structures
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 16 April 2013, 15:0016:00
Fri, 19 Apr 2013 09:52:18 +0100
Isaac Newton Institute
Kats, E
b191b41d85cdd72e84abf013c6540d28
41081d6574cdce0d8f24c45fe6cb9d5e
fe11cd1102807b54033f35e70f6d2392
725baffa84e15f38b7bc328d8b9255a1
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 16 April 2013,...
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 16 April 2013, 15:0016:00
Cambridge University
3494
http://sms.cam.ac.uk/media/1464729
Landau Theory for ''Mendeleev's'' Tables of Polar Smectic Structures
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 16 April 2013, 15:0016:00
Polar smectic liquid crystals exhibit a variety of phases with multilayer ordering. Recent progress in experimental technique and discovery of several ferrielectric and antiferroelectric phases has put forward a number of fundamental problems: whether the known set of structures is exhaustive or other polar smectic phases exist? Is there an interconnection between azimuthal ordering of molecules in smectic layers and other degrees of freedom such as polar orientation of molecules? We employed the discrete Landau model of phase transitions with twocomponent order parameter to calculate the structures and phase diagrams of polar smectic liquid crystals. Structures commensurate and incommensurate with layer spacing are formed due to frustrating nextnearest interlayer interaction. Sequences of phases on temperature and the dependence of the phase sequences on model parameters are studied. Influence of different interlayer interactions on the topology of the phase diagrams is analyzed. The calculated phase diagrams enable to describe formation of various polar phases and their temperature sequences, including the unusual reversed phase sequence and the polar phase with sixlayer periodicity. Our calculations also predict the existence of a reentrant phase sequence with two incommensurate phases. The results of our calculations demonstrate that discrete Landau model of phase transitions can be successfully used to describe the manifold of polar smectic structures observed in experiment.
Coauthors: P.V.Dolganov (Institute of Solid State Physics, Chernogolvka, Russia), V.M.Zhilin (nstitute of Solid State Physics, Chernogolvka, Russia), V.K.Dolganov (nstitute of Solid State Physics, Chernogolvka, Russia)
20130419T09:52:41+01:00
3494
1464729
true
16x9
false
no

Landau weak crystallization theory of main phase transition in membranes
ucs_sms_1383776_1489825
http://sms.cam.ac.uk/media/1489825
Landau weak crystallization theory of main phase transition in membranes
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 28 May 2013, 14:0015:00
Wed, 29 May 2013 10:31:09 +0100
Isaac Newton Institute
Kats, E
fc6e54b81246f2db2722a13edf9ea5b6
2044b8d8846be476503d5bfc97e6d2fd
f043d7480f95ef10dadc3d9e1ba40586
048c078d6c413cc78c3cf42619f1bf1a
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 28 May 2013,...
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 28 May 2013, 14:0015:00
Cambridge University
3135
http://sms.cam.ac.uk/media/1489825
Landau weak crystallization theory of main phase transition in membranes
Kats, E (Landau Institute for Theoretical Physics)
Tuesday 28 May 2013, 14:0015:00
We demonstrate that experimental data concerning the main phase transition in membranes can be rationalized in the framework of a theoretical scheme constructed in the spirit of the socalled weak crystallization theory. The scheme enables to explain a combination of seemingly contradictory features of the main phase transition: its first order nature and a well pronounced pretransitional critical behaviour of various physical quantities.
20130529T10:31:36+01:00
3135
1489825
true
16x9
false
no

LebwohlLasher models of liquid crystals: from quadrupolar to spontaneously induced chiral order
ucs_sms_1383776_1443891
http://sms.cam.ac.uk/media/1443891
LebwohlLasher models of liquid crystals: from quadrupolar to spontaneously induced chiral order
Longa, L (Uniwersytet Jagiellonski)
Wednesday 20 March 2013, 14:0014:50
Thu, 21 Mar 2013 16:17:36 +0000
Isaac Newton Institute
Longa, L
939e656285928e1af14d48208f6dc7eb
874dad538c15ebeec4881586e57965ae
7a3317a594f1da81001b5c9484f9e547
defb6ace7825acec23d033b405c27826
Longa, L (Uniwersytet Jagiellonski)
Wednesday 20 March 2013, 14:0014:50
Longa, L (Uniwersytet Jagiellonski)
Wednesday 20 March 2013, 14:0014:50
Cambridge University
3209
http://sms.cam.ac.uk/media/1443891
LebwohlLasher models of liquid crystals: from quadrupolar to spontaneously induced chiral order
Longa, L (Uniwersytet Jagiellonski)
Wednesday 20 March 2013, 14:0014:50
In 1972 P. A. Lebwohl and Q. Lasher (LL) (PRA 6, 426 (1972)) have carried out standard Monte Carlo simulations on the lattice version of the MaierSaupe (MS) model to test predictions of the MS meanfield calculations. Preserving uniaxial symmetry (D∞h)for nematics they assumed liquid crystalline molecules to occupy the sites of a three dimensional cubic lattice subjected to periodic boundary conditions. Pair interaction potential, limited to nearestneighbor molecules, was given by the second Legendre polynomial of the relative angle between the molecular long axes. The simulations showed that the LL lattice model undergoes a weak firstorder phase transition between isotropic and uniaxial nematic order, in qualitative agreement with MS predictions. Since the model has proved to correctly account for the essential symmetry of liquid crystalline orientational order a large amount of work has been and is currently devoted to generalizations of the LL model to more complex situations. They involve, without trying to be exhaustive, (a) investigation of the nematic ordering in confined geometries, subject to different surface anchoring fields, (b) effect of an external field on the isotropic  nematic phase transition(s), (c) simulations of electrooptical devices, (d) simulation of chiral liquid crystal phases, (e) orientational properties of elastomers and (f) physics of twodimensional systems.
In this talk, after a brief review of properties and generalizations of the LL model, I will concentrate on simple versions of this model that can be useful in investigating spontaneous formation of macroscopic chiral domains of opposite handednesses observed in bentcore, dimer and ferrocene mesogens. More specifically, I will discuss properties of the LL model with quadrupolar and octupolar pairinteractions. The model will be shown to generate longrange biaxial order along with ambidextrous twist deformations. A possibility of generating nonzero splay and bent configurations will also be discussed. The class of LL models is generic in the sense that only symmetry allowed terms are retained in the interaction potential. Hence, orientational structures identified not only characterize nematiclike states but can also coexist with a longrange positional order, characteristic of smectic, columnar or crystalline phases.
20130321T16:17:59+00:00
3209
1443891
true
16x9
false
no

Line defects in a variational model related to liquid crystals
ucs_sms_1383776_1464714
http://sms.cam.ac.uk/media/1464714
Line defects in a variational model related to liquid crystals
Ignat, R (Université ParisSud 11)
Tuesday 16 April 2013, 14:0015:00
Fri, 19 Apr 2013 09:35:55 +0100
Isaac Newton Institute
Ignat, R
2e013fece0dba4ad76e701b4240292cf
e6a77ddaeda4258822356f1671c10ab6
60eb83348426c42ef3098610daa8aa3e
417f97888ae88847604adf0ddcd23bdf
Ignat, R (Université ParisSud 11)
Tuesday 16 April 2013, 14:0015:00
Ignat, R (Université ParisSud 11)
Tuesday 16 April 2013, 14:0015:00
Cambridge University
3600
http://sms.cam.ac.uk/media/1464714
Line defects in a variational model related to liquid crystals
Ignat, R (Université ParisSud 11)
Tuesday 16 April 2013, 14:0015:00
We will analyze the asymptotic behavior of a twodimensional GinzburgLandau model for gradient fields. The main feature of the model consists in the nucleation of linedefects on which the energy concentrates. We develop the concept of entropies coming from scalar conservation laws in order to carry on the asymptotic analysis and to characterize the limit lineenergies. We will also discuss the structure of minimizing configurations.
20130419T09:36:19+01:00
3600
1464714
true
16x9
false
no

Liquid crystal defects, a critical overview
ucs_sms_1383776_1510799
http://sms.cam.ac.uk/media/1510799
Liquid crystal defects, a critical overview
Kleman, M (Institut de Physique du Globe de Paris)
Monday 24 June 2013, 09:4510:30
Wed, 03 Jul 2013 08:56:35 +0100
Isaac Newton Institute
Kleman, M
e37c3cfbeef03b8eddb8a393cdd427ab
b33fabfde5f79fbf3d7fa0538465621b
88aebd2ab936f6fe38f99600270a651f
3bb3f8d7673f2167ebd0fab11a8640c2
Kleman, M (Institut de Physique du Globe de Paris)
Monday 24 June 2013,...
Kleman, M (Institut de Physique du Globe de Paris)
Monday 24 June 2013, 09:4510:30
Cambridge University
3295
http://sms.cam.ac.uk/media/1510799
Liquid crystal defects, a critical overview
Kleman, M (Institut de Physique du Globe de Paris)
Monday 24 June 2013, 09:4510:30
Defects in liquid crystals present an extremely vast set of situations, depending on the nature of the order parameter, elasticity properties, boundary conditions. One distinguishes : defects characteristic of liquid crystalline media with one or two discrete repeat distances (smectic and columnar phases) which can be investigated by pure geometric methods ; defects characteristic of a director order parameter, which employ the Volterra process (for one dimensional defects) and topological methods, those latter providing scope for defects of various dimensionalities ; finally continuous defects whose consideration is essential for a description of defect physical properties. These topics will be confronted with an historical point of view and possible future developments.
20130703T17:20:04+01:00
3295
1510799
true
16x9
false
no

Liquid Crystal Director Models with Coupled Electric Fields
ucs_sms_1383776_1442448
http://sms.cam.ac.uk/media/1442448
Liquid Crystal Director Models with Coupled Electric Fields
Gartland Jr., EC (Kent State University)
Tuesday 19 March 2013, 09:0009:50
Tue, 19 Mar 2013 13:56:48 +0000
Isaac Newton Institute
Gartland Jr., EC
144ad955c1f63465acbd01eeb297a68a
0e333b74aa9891ec0ec61681d0d3548c
7cb9d432dc7363130f5c67bc8f5cc488
4b97c133c1ab2117315395fadb6f1c33
Gartland Jr., EC (Kent State University)
Tuesday 19 March 2013, 09:0009:50
Gartland Jr., EC (Kent State University)
Tuesday 19 March 2013, 09:0009:50
Cambridge University
3187
http://sms.cam.ac.uk/media/1442448
Liquid Crystal Director Models with Coupled Electric Fields
Gartland Jr., EC (Kent State University)
Tuesday 19 March 2013, 09:0009:50
Historically, many liquidcrystal devices and experiments have involved lowmolecularweight nematic liquid crystals, in supramicronsize confinements, with coupled electric fields. In such settings, equilibrium orientational properties can be modeled most effectively using the OseenFrank elastic theory coupled with the equations of electrostatics. In this (mostly) expository talk, we will discuss some of the issues that arise in the mathematical and numerical treatment of such classical models. These issues include the intrinsic minimax nature of such models, which arises from the negativedefinite way in which the electrostatic potential enters the free energy functional and which can also arise when Lagrange multipliers are used to enforce the pointwise unitvector constraints on the liquidcrystal director field, as well as the complications this indefiniteness adds to the assessment of local stability of equilibria. We will also discuss the anomalous behavior that can be exhibited at the thresholds of certain electricfieldinduced instabilities because of the nature of the coupling between the director field and the electric field. In addition, we will contrast the macroscopic OseenFrank model with the mesoscopic Landaude Gennes model in such contexts.
20130319T13:57:10+00:00
3187
1442448
true
16x9
false
no

Liquid Crystal Elastomers and Light
ucs_sms_1383776_1519015
http://sms.cam.ac.uk/media/1519015
Liquid Crystal Elastomers and Light
PalffyMuhoray, P (Kent State University)
Friday 28 June 2013, 16:0016:45
Mon, 15 Jul 2013 09:40:04 +0100
Isaac Newton Institute
PalffyMuhoray, P
d8a8dc7b25ba13559b08032c7705ef67
58e4449f4fb0b0d39325f901206fcf8c
cefee55d34d89856098ca4ee27005e7d
712be0f39d5f5fd74d0fd228609004f3
PalffyMuhoray, P (Kent State University)
Friday 28 June 2013, 16:0016:45
PalffyMuhoray, P (Kent State University)
Friday 28 June 2013, 16:0016:45
Cambridge University
2570
http://sms.cam.ac.uk/media/1519015
Liquid Crystal Elastomers and Light
PalffyMuhoray, P (Kent State University)
Friday 28 June 2013, 16:0016:45
Liquid crystal elastomers are solid liquid crystals; they combine elasticity with orientational order. Mechanical strain therefore changes liquid crystalline order and the optical properties of these materials. Conversely, light can change the orientational order, and give rise to mechanical forces and changes in shape. Lightmatter interactions in LCEs therefore involve a broad range of unusual phenomena, which raise a number of intriguing questions. I will present the results of some experiments probing such phenomena, and discuss the underlying physics.
20130715T11:21:30+01:00
2570
1519015
true
16x9
false
no

Liquid Crystal elastomers: microstructures and active shape control
ucs_sms_1383776_1508867
http://sms.cam.ac.uk/media/1508867
Liquid Crystal elastomers: microstructures and active shape control
DeSimone, A (SISSA)
Wednesday 26 June 2013, 14:0014:45
Mon, 01 Jul 2013 09:00:17 +0100
Isaac Newton Institute
DeSimone, A
6c3de8f2bf4a71d6ff15a570d53a3a44
abd196664749b674b70104b226867a5e
8a05fd12e58dc022269ab21876d7cff2
8da226058e4021bf62d2b7dbb25281b6
DeSimone, A (SISSA)
Wednesday 26 June 2013, 14:0014:45
DeSimone, A (SISSA)
Wednesday 26 June 2013, 14:0014:45
Cambridge University
2635
http://sms.cam.ac.uk/media/1508867
Liquid Crystal elastomers: microstructures and active shape control
DeSimone, A (SISSA)
Wednesday 26 June 2013, 14:0014:45
Liquid crystal elastomers are highly responsive materials thanks to their ability to switch between symmetryrelated states of spontaneous distortion. We will review methods to predict their macroscopic response to applied loads and fields using the technique of quasiconvexification. In addition, we will discuss the possibilities of inducing prescribed shape changes through imprinted patterns of director orientations and/or localized actuation.
20130701T13:25:49+01:00
2635
1508867
true
16x9
false
no

Liquid crystal foam
ucs_sms_1383776_1464762
http://sms.cam.ac.uk/media/1464762
Liquid crystal foam
Teixeira, P (ISEL and Universidade de Lisboa)
Wednesday 17 April 2013, 11:0012:00
Fri, 19 Apr 2013 10:09:19 +0100
Isaac Newton Institute
Teixeira, P
b638179942a80dcb47a85f2efbd1d116
bf7830538b9469ca614bf05ced26bf1a
f21af6a2356b8582de7e9384b14224ed
ec73d62b0eefe409a308035d0d743a3e
Teixeira, P (ISEL and Universidade de Lisboa)
Wednesday 17 April 2013,...
Teixeira, P (ISEL and Universidade de Lisboa)
Wednesday 17 April 2013, 11:0012:00
Cambridge University
3184
http://sms.cam.ac.uk/media/1464762
Liquid crystal foam
Teixeira, P (ISEL and Universidade de Lisboa)
Wednesday 17 April 2013, 11:0012:00
We investigate whether a liquid crystal foam, made by shearing an ionic mesogen, exhibits the same properties as an ordinary liquid foam. In particular, for a quiescent foam we find: (i) where three walls meet, they do so at approximately 120degree angles, for all times studied; (ii) Lewis’s law of linear relation between cell area and number of sides is approximately satisfied at late times; (iii) the morphological patterns coarsen in time, both T1 and T2 processes are observed and, at late times, evolution is consistent with von Neumann’s law; and (iv) relatively large numbers of 5sided cells survive up to fairly late times. Results (i) and (iii) suggest that surface tension may play a key role in determining the physics of this system, as it does in lowviscosity liquid foams. If our mesogen is subjected to controlled shear, there is a threshold shear rate below which no foam can form. Above this threshold, a steadystate foam pattern is obtained where the mean cell area generally decreases with increasing shear rate. Furthermore, the steadystate internal cell angles and distribution of cell number of sides deviate from their equilibrium (i.e. zeroshear) values.
20130419T10:09:41+01:00
3184
1464762
true
16x9
false
no

Liquid crystal phases of biological networks: models and analysis
ucs_sms_1383776_1469476
http://sms.cam.ac.uk/media/1469476
Liquid crystal phases of biological networks: models and analysis
Calderer, MC (University of Minnesota)
Thursday 11 April 2013, 11:3012:30
Fri, 26 Apr 2013 12:03:32 +0100
Isaac Newton Institute
Calderer, MC
32f6336476215dc7f4723bc9b5ffa257
086d56d71b441ed272e58caebb505626
6943edad0501dbeac77d19c2aebe13a9
4e000fc938217aab82c1225511b86659
Calderer, MC (University of Minnesota)
Thursday 11 April 2013, 11:3012:30
Calderer, MC (University of Minnesota)
Thursday 11 April 2013, 11:3012:30
Cambridge University
4380
http://sms.cam.ac.uk/media/1469476
Liquid crystal phases of biological networks: models and analysis
Calderer, MC (University of Minnesota)
Thursday 11 April 2013, 11:3012:30
Cytoskeletal networks consist of rigid, rodlike actin protein units jointed by flexible crosslinks, presenting coupled orientational and deformation effects analogous to liquid crystal elastomers. The alignment properties of the rigid rods influence the mechanical response of the network to applied stress and deformation, affecting functionality of the systems. Parameters that characterize these networks include the aspect ratio of the rods and the average length of the crosslinks, with a large span of parameter values found across invivo networks. For instance, cytoskeletal networks of red blood cells have very large linkers and small rod aspect ratio, whereas those of cells of the outer hair of the ear have large aspect ratio and short linkers favoring well aligned nematic, in order to achieve optimal sound propagation. We propose a class of free energy densities consisting of the sum of polyconvex functions of the anisotropic deformation tensor and the Landaude Gennes energy of lyotropic liquid crystals. The growth conditions of the latter, with respect to the rod density and the nematic order tensor at the limit of the minimum eigenvalue 1/3 are essential to recover the limiting deformation map from the minimizing sequences of the anisotropic deformation gradient. We consider a bulk free energy density encoding properties of the rod and the network based on the LopatinaSelinger construction for the MaierSaupe theory. We then analyze the phase transition behavior under uniform expansion, biaxial extension and shear deformation, showing that the nematicisotropic transition may be accompanied by a change of volume, which manifests itself in the nonconvexity of the stressstrain relation. We also account for the fact that invivo networks are found in the gel state. We conclude with some remarks on the roles of active elements in the model.
20130426T12:03:56+01:00
4380
1469476
true
4x3
false
no

Liquid crystals and general relativity
ucs_sms_1383776_1438283
http://sms.cam.ac.uk/media/1438283
Liquid crystals and general relativity
Gibbons, G (University of Cambridge)
Tuesday 05 March 2013, 14:0015:00
Wed, 13 Mar 2013 17:10:37 +0000
Isaac Newton Institute
Gibbons, G
be0e32695bb2d728959ea5ce3fee7169
e912157a03e8ffd3c39000975d22c33b
16f2b7e4be46fa6d061f307fd6bf1712
73a2c4f68185cf19a3b2ab1cbfa789a7
Gibbons, G (University of Cambridge)
Tuesday 05 March 2013, 14:0015:00
Gibbons, G (University of Cambridge)
Tuesday 05 March 2013, 14:0015:00
Cambridge University
3660
http://sms.cam.ac.uk/media/1438283
Liquid crystals and general relativity
Gibbons, G (University of Cambridge)
Tuesday 05 March 2013, 14:0015:00
20130313T17:10:57+00:00
3660
1438283
true
16x9
false
no

Liquid crystals and what they have taught us
ucs_sms_1383776_1387946
http://sms.cam.ac.uk/media/1387946
Liquid crystals and what they have taught us
Lubensky, T (University of Pennsylvania )
Thursday 10 January 2013, 10:0011:00
Wed, 16 Jan 2013 09:42:13 +0000
Isaac Newton Institute
Lubensky, T
f634cf938fe0cc24cb8ec3964753a2cf
ac597ea9eb2c400c10283b01079ca857
c6e10e71c8a4e9af2a1f05071c40f07e
4fa746974dc743a78ae84cfc4818ca08
cf9e01e97d18aeaff8dec0221a04cfe3
Lubensky, T (University of Pennsylvania )
Thursday 10 January 2013, 10:0011:00
Lubensky, T (University of Pennsylvania )
Thursday 10 January 2013, 10:0011:00
Cambridge University
3507
http://sms.cam.ac.uk/media/1387946
Liquid crystals and what they have taught us
Lubensky, T (University of Pennsylvania )
Thursday 10 January 2013, 10:0011:00
Broken symmetries and conservation laws lie at the very heart of our understanding of the physical world. They control the physical properties and phenomena ranging from the masses of elementary particles to the flow to the oceans. Liquid crystals provide an almost ideal laboratory for studying phenomena  lowenergy elasticity and hydrodynamics, topological defects, and critical fluctuations  associated with broken symmetries. This talk will review some of the important things we have learned from liquid crystals including how to describe broken rotational symmetries, what crystals really are and how to describe their elasticity and dynamics, and how fluctuations and spatial dimension affect the existence of order.
20130116T09:42:34+00:00
3507
1387946
true
16x9
false
no

Liquid crystals at patterned substrates
ucs_sms_1383776_1439367
http://sms.cam.ac.uk/media/1439367
Liquid crystals at patterned substrates
Cleaver, D (Sheffield Hallam University)
Thursday 07 March 2013, 11:0012:00
Thu, 14 Mar 2013 16:16:30 +0000
Isaac Newton Institute
Cleaver, D
a0ce1aedd2ef3b18cd5689ca2b1e5c59
7e1e07b6d54d54fb9b6680b3e3780076
dd4698a69c91cc87d9cc1a0c4f80fb7e
9fa1dd2cd6cd4eff6d1e9d267e809f30
Cleaver, D (Sheffield Hallam University)
Thursday 07 March 2013, 11:0012:00
Cleaver, D (Sheffield Hallam University)
Thursday 07 March 2013, 11:0012:00
Cambridge University
4500
http://sms.cam.ac.uk/media/1439367
Liquid crystals at patterned substrates
Cleaver, D (Sheffield Hallam University)
Thursday 07 March 2013, 11:0012:00
20130314T16:16:50+00:00
4500
1439367
true
16x9
false
no

Liquid crystals described within the phasefield crystal model
ucs_sms_1383776_1441402
http://sms.cam.ac.uk/media/1441402
Liquid crystals described within the phasefield crystal model
Löwen, H (Universität Düsseldorf)
Thursday 14 March 2013, 11:0012:00
Mon, 18 Mar 2013 09:04:32 +0000
Isaac Newton Institute
Löwen, H
391a202491404821bb45625587795f0c
3c32cf31b0cbc4e0dce72e906bd07ff7
d96809a9102ca7f7c02fed8c7187a52d
547282fce51f862f8e88c3b6de7e6701
Löwen, H (Universität Düsseldorf)
Thursday 14 March 2013, 11:0012:00
Löwen, H (Universität Düsseldorf)
Thursday 14 March 2013, 11:0012:00
Cambridge University
4140
http://sms.cam.ac.uk/media/1441402
Liquid crystals described within the phasefield crystal model
Löwen, H (Universität Düsseldorf)
Thursday 14 March 2013, 11:0012:00
20130318T09:04:54+00:00
4140
1441402
true
16x9
false
no

Liquid Crystals History
ucs_sms_1383776_1512817
http://sms.cam.ac.uk/media/1512817
Liquid Crystals History
Sluckin, T (University of Southampton)
Wednesday 26 June 2013, 16:4517:30
Fri, 05 Jul 2013 14:08:04 +0100
Isaac Newton Institute
Sluckin, T
ee8a0169cc64b3d3d4ae9c2d17807deb
8510196ee931257a3774d4bb3962918a
acb462476c1d52ffcc64a1b395b5dfdc
7e12c966b5f620824bd4388dbbb4fe22
Sluckin, T (University of Southampton)
Wednesday 26 June 2013, 16:4517:30
Sluckin, T (University of Southampton)
Wednesday 26 June 2013, 16:4517:30
Cambridge University
4200
http://sms.cam.ac.uk/media/1512817
Liquid Crystals History
Sluckin, T (University of Southampton)
Wednesday 26 June 2013, 16:4517:30
20130705T14:08:54+01:00
4200
1512817
true
16x9
false
no

Liquid crystals out of equilibrium: connecting molecular dynamics, kinetic and hydrodynamic equations
ucs_sms_1383776_1444582
http://sms.cam.ac.uk/media/1444582
Liquid crystals out of equilibrium: connecting molecular dynamics, kinetic and hydrodynamic equations
Fatkullin, I (University of Arizona)
Friday 22 March 2013, 09:5010:40
Fri, 22 Mar 2013 17:04:42 +0000
Isaac Newton Institute
Fatkullin, I
66f52b26e52f4687690b5ef520a18671
386c1650190151f53066ffd0aeef9f57
1d5893ac30c9564b3099a1d462a34435
2c806e634f1240ddc171b6cd85893a5e
Fatkullin, I (University of Arizona)
Friday 22 March 2013, 09:5010:40
Fatkullin, I (University of Arizona)
Friday 22 March 2013, 09:5010:40
Cambridge University
3025
http://sms.cam.ac.uk/media/1444582
Liquid crystals out of equilibrium: connecting molecular dynamics, kinetic and hydrodynamic equations
Fatkullin, I (University of Arizona)
Friday 22 March 2013, 09:5010:40
I will start from the microscopic Hamiltonian dynamics and use projectionoperator formalism to derive a generalized Langevin equation for liquid crystalline systems. Using Markovian approximation this equation then may be tuned into a bona fide stochastic differential equation which may be used for molecular dynamics simulations. Further on, using ideas of propagation of chaos, we can derive kinetic DoiSmoluchwski type equation, and finally, the hydrodynamic equations as equations for the moments.
20130322T17:05:03+00:00
3025
1444582
true
16x9
false
no

Liquid crystals, liquid crystal droplets and colloids: basic properties
ucs_sms_1383776_1384069
http://sms.cam.ac.uk/media/1384069
Liquid crystals, liquid crystal droplets and colloids: basic properties
Lavrentovich, OD (Kent State University)
Monday 07 January 2013, 11:3012:30
Fri, 11 Jan 2013 08:50:40 +0000
Isaac Newton Institute
Lavrentovich, OD
159027f61a25236fd1b96179a78b2f54
abb7949d4ec1bfc184327f604ef72d72
fdf177555e5ba35abae42a1321965c91
f97a8b86b81476b9878e15f77c608b55
b9f5e232ac9cb6e0d3347f236f6f0473
Lavrentovich, OD (Kent State University)
Monday 07 January 2013, 11:3012:30
Lavrentovich, OD (Kent State University)
Monday 07 January 2013, 11:3012:30
Cambridge University
3669
http://sms.cam.ac.uk/media/1384069
Liquid crystals, liquid crystal droplets and colloids: basic properties
Lavrentovich, OD (Kent State University)
Monday 07 January 2013, 11:3012:30
The review presents basic physical properties of liquid crystals: orientational and translational elasticity (OseenFrank formalism), surface anchoring, and topological defects. A special emphasis is on liquid crystals in form of drops and on liquid crystals containing small particles in the bulk. The liquid crystal colloids enable new physical effects, such as nonlinear electrophoresis. The work presented is based on research sponsored by the National Science Foundation, USA.
20130111T08:51:01+00:00
3669
1384069
true
16x9
false
no

Liquid dielectrophoresis and wrinkling on the surface of a fluid layer
ucs_sms_1383776_1486994
http://sms.cam.ac.uk/media/1486994
Liquid dielectrophoresis and wrinkling on the surface of a fluid layer
Corson, L (Strathclyde)
Tuesday 21 May 2013, 11:1011:30
Fri, 24 May 2013 10:06:38 +0100
Isaac Newton Institute
Corson, L
7f8ad6b6af04c65d68d41c04ebc14551
2bf0b61dbd0e2fcc1c6f35c15d46c9ed
8b8a39860a3343f97f0d6cbb19a3dc44
cac091eb914d92e99fb200e9603dc73b
Corson, L (Strathclyde)
Tuesday 21 May 2013, 11:1011:30
Corson, L (Strathclyde)
Tuesday 21 May 2013, 11:1011:30
Cambridge University
1335
http://sms.cam.ac.uk/media/1486994
Liquid dielectrophoresis and wrinkling on the surface of a fluid layer
Corson, L (Strathclyde)
Tuesday 21 May 2013, 11:1011:30
There is a growing technologydriven interest in using external forces to move or shape small quantities of liquids. One existing technique, electrowetting, involves the application of an electric field to a conducting liquid. A disadvantage of this technique is that the liquid must remain in contact with the electrodes. However, this is not the case in liquid dielectrophoresis, where a dielectric (i.e. nonconducting) liquid is used. A common aspect to both these techniques is that electrical surface stresses at liquidair or liquidliquid interfaces play an important role.
In this work we consider a layer of dielectric liquid of nondimensional depth h(x,t) wetting a horizontal electrode with a hydrodynamically passive dielectric fluid (e.g. air) above. A second electrode is located at a distance d>h above the lower substrate. When the applied voltage is increased past a critical value, an instability occurs on the free surface of the liquid. We investigate how the material and cell geometry parameters affect the critical applied voltage and the form of the instability. Using linear stability analysis, we find that there exists a critical spacing dc above which the fastest growing unstable mode has a nonzero wave number, so that undulations (``wrinkles'') form on the free surface. Below this critical spacing, the fastest growing unstable mode has a zero wave number, so that wrinkles do not form. In general, we also find that higher values of the inverse Bond number τ (proportional to the surface tension) lead to a stab ilisation of the zero wave number mode, i.e. higher values of d are required for wrinkling to occur. Furthermore, if the inverse Bond number is sufficiently low, a second critical spacing $\tilde{d}_c
20130524T10:07:05+01:00
1335
1486994
true
16x9
false
no

Localised pattern formation
ucs_sms_1383776_1388276
http://sms.cam.ac.uk/media/1388276
Localised pattern formation
Dawes, J (University of Bath)
Thursday 10 January 2013, 15:3016:30
Wed, 16 Jan 2013 12:30:13 +0000
Isaac Newton Institute
Dawes, J
2e8621340a0095e0d8bdc46f37c64207
7110c06af57765715436c01e2217ae8f
2abc1cb4538c14a05c03fa7752d3184f
9bab538e0526fdb46cab84482b672235
858830ea3e75b8aa6a11ec867ff9da35
Dawes, J (University of Bath)
Thursday 10 January 2013, 15:3016:30
Dawes, J (University of Bath)
Thursday 10 January 2013, 15:3016:30
Cambridge University
3600
http://sms.cam.ac.uk/media/1388276
Localised pattern formation
Dawes, J (University of Bath)
Thursday 10 January 2013, 15:3016:30
Patternforming (Turing) instabilities are observed sometimes to generate patches of periodic structure rather than domainfilling patterns. I will present physical examples and toy model PDEs, and outline the bifurcation theory that provides an explanation for this, at least in one spatial dimension.
20130116T12:30:34+00:00
3600
1388276
true
16x9
false
no

Mathematical problems of the Qtensor theory of nematics
ucs_sms_1383776_1439360
http://sms.cam.ac.uk/media/1439360
Mathematical problems of the Qtensor theory of nematics
Zarnescu, A (University of Sussex)
Tuesday 12 March 2013, 14:0015:00
Thu, 14 Mar 2013 16:16:05 +0000
Isaac Newton Institute
Zarnescu , A
5a06bdcfceeeee423e3d9139a9672216
d861b46b183d3f58370b41ca0bbdc7f7
949dcf97c3d16fc6a0b0bc55b23f2e29
e33690344e15ff1258cf46d262f85842
Zarnescu, A (University of Sussex)
Tuesday 12 March 2013, 14:0015:00
Zarnescu, A (University of Sussex)
Tuesday 12 March 2013, 14:0015:00
Cambridge University
4620
http://sms.cam.ac.uk/media/1439360
Mathematical problems of the Qtensor theory of nematics
Zarnescu, A (University of Sussex)
Tuesday 12 March 2013, 14:0015:00
20130314T16:16:26+00:00
4620
1439360
true
16x9
false
no

Mechanical response and microstructures in liquid crystal elastomers: small vs large strain theories
ucs_sms_1383776_1469673
http://sms.cam.ac.uk/media/1469673
Mechanical response and microstructures in liquid crystal elastomers: small vs large strain theories
De Simone, A (SISSA)
Friday 12 April 2013, 09:0010:00
Fri, 26 Apr 2013 12:54:51 +0100
University of Cambridge
Sarah Middle
4f266a2104f7b3b907c2fb81e89e1d90
3079c226b7f2c20c66df502a5d5bf9e1
79bf9a245ceb58e6ac321798c73ed3cc
ac58a65c4ff29e19d89a7c7ea6230a66
De Simone, A (SISSA)
Friday 12 April 2013, 09:0010:00
De Simone, A (SISSA)
Friday 12 April 2013, 09:0010:00
Cambridge University
3720
http://sms.cam.ac.uk/media/1469673
Mechanical response and microstructures in liquid crystal elastomers: small vs large strain theories
De Simone, A (SISSA)
Friday 12 April 2013, 09:0010:00
In this talk, we will present recent theoretical and numerical results for models of nematic elastomers within the small strain approach.
While strains exhibited by nematic elastomers are usually large, there are cases where this is not so, and the early modeling approaches were using this framework. In fact, the main reason for the developing small strain theories for nematic elastomers is the clear geometric structure of the resulting energy landscape.
We will exploit this structure to discuss material instabilities and stressstrain diagrams, and to suggest possible generalizations to more realistic models.
20130426T12:55:14+01:00
3720
1469673
true
4x3
false
no

Microphase separation driven transitions in macromolecular liquid crystals by computer simulations
ucs_sms_1383776_1443941
http://sms.cam.ac.uk/media/1443941
Microphase separation driven transitions in macromolecular liquid crystals by computer simulations
Ilnytskyi, J (National Academy of Sciences of Ukraine)
Wednesday 20 March 2013, 16:0016:50
Thu, 21 Mar 2013 17:11:31 +0000
Isaac Newton Institute
Ilnytskyi, J
51f4ffd916ca5b2a91f72491148bef39
69c515ad9f937283e00afb58723135e5
8b670300f80cfccdf273fa5eca3f6027
e2cd876932e1cb0da4852a9703ff2b18
Ilnytskyi, J (National Academy of Sciences of Ukraine)
Wednesday 20 March...
Ilnytskyi, J (National Academy of Sciences of Ukraine)
Wednesday 20 March 2013, 16:0016:50
Cambridge University
3229
http://sms.cam.ac.uk/media/1443941
Microphase separation driven transitions in macromolecular liquid crystals by computer simulations
Ilnytskyi, J (National Academy of Sciences of Ukraine)
Wednesday 20 March 2013, 16:0016:50
We present the results of some recent simulations of macromolecular liquid crystal systems that undergo orderdisorder transitions driven by a microphase separation. Molecular dynamics simulations are performed to study a liquid crystal elastomer of a sidechain architecture crosslinked in the SmA phase. Several effects have been observed: (i) the increase of the SmAI transition temperature as the result of crosslinking; (ii) memory effects in liquid crystallinity and shape when the elastomer is driven through the SmI transition; (iii) both cases of homogeneous director reorientation and stripe formation when the load is applied along the nematic director [1]. In another set of results we consider bulk selfassembly of liquid crystal dendrimers studied by means of coarsegrained molecular dynamics simulations. We discuss the details of the modelling and its application to polymermodified gold nanoparticles. The particular model dendrimer being studied demonstrates conforma tional bistability, with both rodlike and disclike conformations stable at lower temperatures. Each conformation can be induced by the external field of appropriate symmetry, promoting further selfassembly of macromolecules into a bulk monodomain SmA or a columnar phase, respectively [2]. The domains of both phases are found to coexist and influence the system properties in a broad temperature interval including transition to the macroscopically isotropic phase. We also discuss the effect of surface anchoring on the selfassembly of these macromolecules [3].
[1] J.M.Ilnytskyi, M.Saphiannikova, D.Neher, M.P.Allen, Soft Matter (2012), DOI: 10.1039/c2sm26499d [2] J.M.Ilnytskyi, J.S.Lintuvuori, M.R.Wilson, Condens. Matter Phys. 13, 33001 (2010). [3] J.M.Ilnytskyi, M.Schoen, M.R.Wilson, in preparation.
20130321T17:11:57+00:00
3229
1443941
true
16x9
false
no

Modeling Multicomponent Liquid Crystal Systems
ucs_sms_1383776_1444367
http://sms.cam.ac.uk/media/1444367
Modeling Multicomponent Liquid Crystal Systems
PalffyMuhoray, P (Kent State University)
Thursday 21 March 2013, 11:0011:50
Fri, 22 Mar 2013 12:04:35 +0000
Isaac Newton Institute
PalffyMuhoray, P
f81390363c0bb33dbc44d5670fd74b50
bff8ade48e241aa2e952e4fa8312937a
5b9ddd525b22e9cf63e94c09cd0ddcd6
6c8ece8f5a1d7ea8339e3dfbc64131a3
PalffyMuhoray, P (Kent State University)
Thursday 21 March 2013, 11:0011:50
PalffyMuhoray, P (Kent State University)
Thursday 21 March 2013, 11:0011:50
Cambridge University
2576
http://sms.cam.ac.uk/media/1444367
Modeling Multicomponent Liquid Crystal Systems
PalffyMuhoray, P (Kent State University)
Thursday 21 March 2013, 11:0011:50
Multicomponent thermotropic liquid crystal mixtures are widely used in the display industry to obtain desired material properties. Usually, the behavior of such mixtures differs little from that of pure materials. In other systems, such as lyotropic, chromonic, colloidal and elastomeric liquid crystals, the behavior can be dramatically different. Standard mean field theories assume a single component, and do not provide an adequate description for such systems. I will discuss strategies to incorporate both attractive and repulsive interactions of multicomponent systems into mean field models, and present some results.
20130322T12:04:56+00:00
2576
1444367
true
16x9
false
no

Modeling the Dynamics of Liquid Crystalline Systems
ucs_sms_1383776_1466905
http://sms.cam.ac.uk/media/1466905
Modeling the Dynamics of Liquid Crystalline Systems
PalffyMuhoray, P (Kent State University)
Monday 08 April 2013, 14:0015:00
Tue, 23 Apr 2013 09:24:04 +0100
Isaac Newton Institute
PalffyMuhoray, P
6e2c91525719cff1e8ae20a230f29cf2
dab604e8e367f09c3acf5b845a9ab150
0e8dfca0c3d5dba44c4de32b7339c86c
f1b61d9b9f9dbf378d62fe827ffa1d55
PalffyMuhoray, P (Kent State University)
Monday 08 April 2013, 14:0015:00
PalffyMuhoray, P (Kent State University)
Monday 08 April 2013, 14:0015:00
Cambridge University
3492
http://sms.cam.ac.uk/media/1466905
Modeling the Dynamics of Liquid Crystalline Systems
PalffyMuhoray, P (Kent State University)
Monday 08 April 2013, 14:0015:00
20130423T09:24:27+01:00
3492
1466905
true
4x3
false
no

Modelling a planar bistable device on different scales
ucs_sms_1383776_1442481
http://sms.cam.ac.uk/media/1442481
Modelling a planar bistable device on different scales
Majumdar, A (University of Bath)
Tuesday 19 March 2013, 09:5010:40
Tue, 19 Mar 2013 14:19:06 +0000
Isaac Newton Institute
Majumdar, A
3dc049a01636aaea60eb916997a21c58
06ffae90d50b4449f4ba56c6dd092041
e38da615345e904163a9198d06428907
d44774010a33e73ec5406fea99fa846e
Majumdar, A (University of Bath)
Tuesday 19 March 2013, 09:5010:40
Majumdar, A (University of Bath)
Tuesday 19 March 2013, 09:5010:40
Cambridge University
2851
http://sms.cam.ac.uk/media/1442481
Modelling a planar bistable device on different scales
Majumdar, A (University of Bath)
Tuesday 19 March 2013, 09:5010:40
This talk focuses on the development, analysis and numerical implementation of mathematical models for a planar bistable nematic device reported in a paper by Tsakonas, Davidson, Brown and Mottram. We model this device within a continuum Landaude Gennes framework and investigate the cases of strong and weak anchoring separately. In both cases, we find six distinct states and compute bifurcation diagrams as a function of the anchoring strength. We introduce the concept of an optimal boundary condition that prescribes the optimal interpolation between defects at the vertices. We develop a parallel latticebased Landaude Gennes interaction potential, by analogy with the LebwohlLasher latticebased model and study multistability within this discrete framework too by means of Monte Carlo methods. We also use the offlattice based Gay Berne model to study the structure of the stable states. The different numerical approaches are compared and we discuss their relative strengths a nd shortcomings. We conclude by a brief discussion on a multiscale modelling approach wherein we can couple a latticebased interaction potential to a conventional continuum model. This is joint work with Chong Luo and Radek Erban.
20130319T14:19:28+00:00
2851
1442481
true
16x9
false
no

Modelling actomyosin droplets, and their consequences for cell motility
ucs_sms_1383776_1507511
http://sms.cam.ac.uk/media/1507511
Modelling actomyosin droplets, and their consequences for cell motility
Marenduzzo, D (University of Edinburgh)
Tuesday 25 June 2013, 11:0011:45
Fri, 28 Jun 2013 14:18:11 +0100
Isaac Newton Institute
Marenduzzo, D
87f082cdabbe3b4d88709256b927f94a
8815d82524af82b0dc2a2adee0ddc4e9
907899889300f703d6f0d478a929c988
d163da558832880a7e242c386b2694fd
Marenduzzo, D (University of Edinburgh)
Tuesday 25 June 2013, 11:0011:45
Marenduzzo, D (University of Edinburgh)
Tuesday 25 June 2013, 11:0011:45
Cambridge University
2600
http://sms.cam.ac.uk/media/1507511
Modelling actomyosin droplets, and their consequences for cell motility
Marenduzzo, D (University of Edinburgh)
Tuesday 25 June 2013, 11:0011:45
We present a lattice Boltzmann study of the dynamics of an actomyosin droplet, described in terms of a continuum model which follows the time evolution of actomyosin density, actin polarisation and flow. This analysis offers a simple representation of a “cell extract”, which is a highly simplified system used in vitro to understand cell dynamics, and which essentially only comprises the actin cytoskeleton and an enclosing cell membrane. In the absence of polymerization and depolymerization processes (‘treadmilling’), the dynamics of our actomyosin droplet arises solely from the contractile motion of myosin motors; this should be unchanged when polarity is inverted. Our results suggest that motility can arise in the absence of treadmilling, by spontaneous symmetry breaking (SSB) of polarity inversion symmetry. This motility mode driven by myosin contractility alone may be relevant to cell motion in three dimensions, where frictional forces, which are crucial to convert actin polymerisatino into motion, are likely to be modest. We also show of active droplets crawling on a substrate, when both treadmilling and contractility are taken into account. Our droplets can adopt a number of morphologies and motility modes found experimentally in cells, such as lamellipodia, pseudopodia and oscillatory cell motion.
20130628T17:48:48+01:00
2600
1507511
true
16x9
false
no

Modelling bistable displays using Qtensor theory
ucs_sms_1383776_1406211
http://sms.cam.ac.uk/media/1406211
Modelling bistable displays using Qtensor theory
Mottram, N (University of Strathclyde)
Thursday 24 January 2013, 11:0012:00
Thu, 07 Feb 2013 17:24:58 +0000
108
108
Isaac Newton Institute
Mottram, N
93aae9d06c22230b4f6e9599f6f90651
f69cc621e65c739f181e0fac198c0823
8a0b587b3b6ea3fd545ee2e33b57b839
2d16277a40265fa611e47337dad4c243
Mottram, N (University of Strathclyde)
Thursday 24 January 2013, 11:0012:00
Mottram, N (University of Strathclyde)
Thursday 24 January 2013, 11:0012:00
Cambridge University
3840
http://sms.cam.ac.uk/media/1406211
Modelling bistable displays using Qtensor theory
Mottram, N (University of Strathclyde)
Thursday 24 January 2013, 11:0012:00
20130208T10:16:51+00:00
3840
1406211
true
16x9
false
no

Modelling Light Propagation Through RadialDirector Liquid Crystal Waveguides
ucs_sms_1383776_1516816
http://sms.cam.ac.uk/media/1516816
Modelling Light Propagation Through RadialDirector Liquid Crystal Waveguides
Cancula, M (University of Ljubljana )
Friday 05 July 2013, 11:1511:30
Thu, 11 Jul 2013 12:36:12 +0100
Isaac Newton Institute
Cancula, M
cc464a19459539e8d2c1b51bf3ec38ea
6602ef1a03ebf1cc18bcaf13b83d2842
d05a0ec8886eb2dc2d8c5e513bd4f53b
288bc019e6165d094575d3093f6e307d
Cancula, M (University of Ljubljana )
Friday 05 July 2013, 11:1511:30
Cancula, M (University of Ljubljana )
Friday 05 July 2013, 11:1511:30
Cambridge University
696
http://sms.cam.ac.uk/media/1516816
Modelling Light Propagation Through RadialDirector Liquid Crystal Waveguides
Cancula, M (University of Ljubljana )
Friday 05 July 2013, 11:1511:30
20130711T12:36:51+01:00
696
1516816
true
16x9
false
no

Modelling planar bistable devices: from Qtensor to director models
ucs_sms_1383776_1442495
http://sms.cam.ac.uk/media/1442495
Modelling planar bistable devices: from Qtensor to director models
Mottram, N (University of Strathclyde)
Tuesday 19 March 2013, 11:0011:50
Tue, 19 Mar 2013 14:47:10 +0000
Isaac Newton Institute
Mottram, N
aca0785fa27b365cf88953e95585d92f
8a10204cd72c1027e3fe594ce51ece99
e77959bb9c5412832b21e2608d60adb1
56197c48faaf385ed8c27f9b37c366fc
Mottram, N (University of Strathclyde)
Tuesday 19 March 2013, 11:0011:50
Mottram, N (University of Strathclyde)
Tuesday 19 March 2013, 11:0011:50
Cambridge University
3046
http://sms.cam.ac.uk/media/1442495
Modelling planar bistable devices: from Qtensor to director models
Mottram, N (University of Strathclyde)
Tuesday 19 March 2013, 11:0011:50
In this talk we continue the theme of bistable devices from the previous presentation. Here we compare the Qtensor model to a director based model, i.e. moving from a mesoscopic approach to a macroscopic approach, in a number of practical examples. We consider the polygonal confinement considered in the previous talk and extend to more general cases of bistability and multistability arising from the morphology of bounding substrates. Bifurcation diagrams of stable states, as parameters such as anchoring strength are varied, are computed. We review some of the advantages and disadvantages of the two modelling approaches and compare results to experimental measurements. Although a director based model is inherently restricted in its inability to model effects such as surface melting and disclination lines, we find that all stable states are in fact reproduced. Additionally we find that, rather surprisingly, the dynamics of switching in the bistable devices can be modelled accu rately using a director theory.
20130319T14:47:34+00:00
3046
1442495
true
16x9
false
no

Modelling Smectic Liquid Crystal Elastomers
ucs_sms_1383776_1509193
http://sms.cam.ac.uk/media/1509193
Modelling Smectic Liquid Crystal Elastomers
Adams, J (University of Surrey)
Thursday 27 June 2013, 11:4512:30
Mon, 01 Jul 2013 13:00:04 +0100
Isaac Newton Institute
Adams, J
870beecf626fe23de53e05c7ab117a61
0ec6930406cfe285068f0fd4ad667131
f31f0c8f7bb7a155b91ad9d3cbc01c88
f8292f409b43a367764c9062c4162219
Adams, J (University of Surrey)
Thursday 27 June 2013, 11:4512:30
Adams, J (University of Surrey)
Thursday 27 June 2013, 11:4512:30
Cambridge University
2564
http://sms.cam.ac.uk/media/1509193
Modelling Smectic Liquid Crystal Elastomers
Adams, J (University of Surrey)
Thursday 27 June 2013, 11:4512:30
Liquid crystal elastomers (LCEs) are rubbery materials that composed of liquid crystalline polymers (LCPs) crosslinked into a network. The rodlike mesogens incorporated into the LCPs are have random orientations in the high temperature isotropic phase, but can adopt the canonical liquid crystalline phases as the temperature is lowered. In this talk I will describe some modelling work of the layered smectic phase of LCEs.
Smectic liquid crystal elastomers have highly anisotropic mechanical behaviour. This arises in side chain smecticA systems because the smectic layers behave as if they are embedded in the rubber matrix [1] (the same cannot be said of main chain smectic systems). The macroscopic mechanical behaviour of these solids is sensitive to the buckling of the layers, so it is a multiscale problem. A coarse grained free energy that includes the finescale buckling of the layers has been developed [2], which enables continuum modelling of these systems. I will describe how this continuum model, when augmented with an additional energy term describing layer buckling and other effects such as finite chain extension, can be used to model deformation of smecticA elastomers in different experimentally accessible geometries.
Modelling smecticC elastomers, with their tilted director, present a bigger challenge to calculating their coarse grained energy. The constraint placed on the director by the layer normal results in some unusual properties of their soft modes such as negative Poisson ratio. I will describe the geometry of these deformation modes in smecticC elastomers [3].
[1] C. M. Spillmann et al, Phys. Rev. E 82, 031705, (2010). [2] J. Adams, S. Conti and A. DeSimone, Mathematical Models and methods in Applied Sciences, 18, 1 (2008). [3] A. W. Brown and J. M. Adams, Phys. Rev. E, 85, 011703 (2012) .
20130701T17:58:21+01:00
2564
1509193
true
16x9
false
no

Molecular and atomistic simulations of liquid crystals
ucs_sms_1383776_1445766
http://sms.cam.ac.uk/media/1445766
Molecular and atomistic simulations of liquid crystals
Zannoni, C (Università di Bologna)
Friday 22 March 2013, 11:0011:50
Mon, 25 Mar 2013 09:32:47 +0000
Isaac Newton Institute
Zannoni, C
6adccd0a613ac6095733ac6ecf69a786
e02783c9a9ff2f14be72b989f002f5c2
e2ded73f20d0b20e6b8e51dd6a23f115
b1cc76c24b708d1c23714ebacca36dda
Zannoni, C (Università di Bologna)
Friday 22 March 2013, 11:0011:50
Zannoni, C (Università di Bologna)
Friday 22 March 2013, 11:0011:50
Cambridge University
3005
http://sms.cam.ac.uk/media/1445766
Molecular and atomistic simulations of liquid crystals
Zannoni, C (Università di Bologna)
Friday 22 March 2013, 11:0011:50
Liquid crystals (LC) continue to offer a fascinating variety of fundamental physics problems related to molecular organizations in the bulk and their modifications close to interfaces [1]. Here we plan to show some recent results for the simulation of these organizations at molecular and atomistic resolution. At molecular resolution we employ GayBerne models and report results for the shape, internal order and chirality of freely suspended low molar mass nematic nanodroplets [2]. We also show that systems as complex as swollen LC elastomers and their deformation in response to the application of an electric field can be simulated [3]. At atomistic level molecular dynamics simulations [4] can now predict actual morphologies and properties in the bulk [4,5] from a specific molecular structure and they can also be useful to analyse NMR data [6,7]. Having validated simulations in the bulk, we also investigate LC close to selected interfaces like hydrogen terminated silicon [1] and crystalline and glassy silica with controlled roughness [8], trying to show how orientational anchoring can be introduced from the microscopic point of view probing the limits of continuum theory on the nanoscale [9].
1 A. Pizzirusso, R. Berardi, L. Muccioli, M. Ricci, C. Zannoni, Chemical Science,3,573(2012) 2 D. Vanzo, M.Ricci, R. Berardi, C.Zannoni, Soft Matter, 8, 11790(2012) 3 G. Skacej, C.Zannoni, PNAS,109,10193(2012) 4 G. Tiberio, L. Muccioli, R. Berardi, C. Zannoni, ChemPhysChem, 10, 125(2009) 5 M.F. Palermo, A. Pizzirusso, L. Muccioli, C. Zannoni, to be submitted (2013) 6 A.Pizzirusso, M.B. Di Cicco, G. Tiberio, L. Muccioli, R. Berardi, C. Zannoni, J.Phys.Chem.B 116,3760(2012) 7 A. C. J. Weber, A. Pizzirusso, L. Muccioli, C. Zannoni, W. L. Meerts, C. A. de Lange, E.E. Burnell, J. Chem. Phys. 136, 174506 (2012) 8 O. M. Roscioni, L. Muccioli, R. G. Della Valle, A. Pizzirusso, M. Ricci, C. Zannoni, to be submitted (2012) 9 M. Ruths, B. Zappone, Langmuir, 28, 8371 (2012).
20130325T09:33:21+00:00
3005
1445766
true
16x9
false
no

Molecular field theory for biaxial smectic A liquid crystals
ucs_sms_1383776_1487390
http://sms.cam.ac.uk/media/1487390
Molecular field theory for biaxial smectic A liquid crystals
To, T (Southampton)
Wednesday 22 May 2013, 10:0010:20
Fri, 24 May 2013 16:22:05 +0100
Isaac Newton Institute
To, T
0bae73b1a77b32c1e4518a2cb7105915
f8e22473fb83ca96ac70015d58c78c9a
16dabfcd324b6c16e27e6b776f86a6c3
1437de719988461c7906091457db095f
To, T (Southampton)
Wednesday 22 May 2013, 10:0010:20
To, T (Southampton)
Wednesday 22 May 2013, 10:0010:20
Cambridge University
929
http://sms.cam.ac.uk/media/1487390
Molecular field theory for biaxial smectic A liquid crystals
To, T (Southampton)
Wednesday 22 May 2013, 10:0010:20
Stable biaxial nematics (Nb) have been reported in a few experimental systems and the phases are often difficult to prove conclusively; however, stable biaxial smectic A phases (SmAb) have been found in a larger number of systems in which the evident is conclusive. To understand the stability difference between Nb and SmAb, we use a molecular field theory that combines Straley's theory [1] for biaxial nematics and McMillan's theory [2] for uniaxial smectic A phases. To simplify the calculation, we use alternatively the geometric mean [3] and the SonnetVirgaDurand [4] approximation to reduce the number of biaxiality parameters to one; in addition, we use the KventselLuckhurstZewdie [5] approximation to decouple the orientational and translational distribution functions. Thus our simple theory has one biaxiality parameter and one smecticity parameter; together with three order parameters. The resulting phase diagrams showed that, for a large region of the para meter space, the presence of the smectic A phases disallowed Nb to form. On the other hand, SmAb is always stable at ground state for positive smecticity parameter. Thus this may explain why SmAb has been found more abundant than Nb.
[1] J. P. Straley, Phys. Rev. A 10, 1881 (1974). [2] W. L. McMillan, Phys. Rev. A 4, 1238 (1971). [3] G. R. Luckhurst, C. Zannoni, P. L. Nordio, and U. Segre, Mol. Phys. 30, 1345 (1975). [4] A. Sonnet, E. G. Virga, and G. E. Durand, Phys. Rev. E 67, 061701 (2003). [5] G. F. Kventsel, G. R. Luckhurst, and H. B. Zewdie, Mol. Phys. 56, 589 (1985).
20130524T16:22:29+01:00
929
1487390
true
16x9
false
no

Molecular modeling of liquid crystal elastomers
ucs_sms_1383776_1444516
http://sms.cam.ac.uk/media/1444516
Molecular modeling of liquid crystal elastomers
Skacej, G (University of Ljubljana)
Thursday 21 March 2013, 14:0014:50
Fri, 22 Mar 2013 15:59:45 +0000
Isaac Newton Institute
Skacej, G
8bf833555754f210015a16ad97a79c63
cbc6a84eaef72ce901a5e8e629ef5a01
773f514477165e1f02d0950df425a046
c063bea3dec1de107e745705cd83d3ca
Skacej, G (University of Ljubljana)
Thursday 21 March 2013, 14:0014:50
Skacej, G (University of Ljubljana)
Thursday 21 March 2013, 14:0014:50
Cambridge University
3262
http://sms.cam.ac.uk/media/1444516
Molecular modeling of liquid crystal elastomers
Skacej, G (University of Ljubljana)
Thursday 21 March 2013, 14:0014:50
Liquid crystal elastomers (LCE) are functional materials consisting of weakly crosslinked polymer networks with embedded liquid crystalline (mesogenic) molecules. Consequently, LCE are characterized by a pronounced coupling between macroscopic strain and orientational mesogenic order. As the latter can be controlled by external stimuli such as temperature, electric field, or ultraviolet light, LCE have great potential for application as sensors and actuators.
Here largescale molecular simulations of swollen mainchain LCE will be presented. The simulated experiments include temperature scans, stressstrain runs, and the application of an external electric field. Our isostress Monte Carlo simulations are capable of reproducing isotropic, nematic and smectic phases, as well as a stressinduced isotropictonematic transition. Moreover, a transversal electric field is seen to induce nematic director rotation resulting in orientational stripe domains. The role of sample swelling has been explored as well.
The simulation output has also been used to connect to typical experimental observables, such as sample dimensions, specific heat, deuterium magnetic resonance spectra, and scattered Xray patterns.
20130322T16:00:05+00:00
3262
1444516
true
16x9
false
no

Molecular organizations in the bulk and close to surfaces
ucs_sms_1383776_1476959
http://sms.cam.ac.uk/media/1476959
Molecular organizations in the bulk and close to surfaces
Zannoni, C (Università di Bologna)
Tuesday 07 May 2013, 12:0013:00
Wed, 08 May 2013 16:23:06 +0100
Isaac Newton Institute
Zannoni, C
5c39f5cd25e47bcfffd8e7dba2e24992
55d8a3c990aa6767d6a7117c85c48096
0044e97286e8f3e5469266e52719a3d5
6d65cdf6feb6d1ae3a5bae58bc9f5841
Zannoni, C (Università di Bologna)
Tuesday 07 May 2013, 12:0013:00
Zannoni, C (Università di Bologna)
Tuesday 07 May 2013, 12:0013:00
Cambridge University
3960
http://sms.cam.ac.uk/media/1476959
Molecular organizations in the bulk and close to surfaces
Zannoni, C (Università di Bologna)
Tuesday 07 May 2013, 12:0013:00
20130508T16:23:28+01:00
3960
1476959
true
16x9
false
no

Molecular Origin of K13 Revisited
ucs_sms_1383776_1387283
http://sms.cam.ac.uk/media/1387283
Molecular Origin of K13 Revisited
Yokoyama, H (Kent State University)
Tuesday 08 January 2013, 15:3016:30
Tue, 15 Jan 2013 11:21:45 +0000
Isaac Newton Institute
Yokoyama, H
f8879f7ad4f17c88d08bc21890f1fa5d
4be279bbd4dc93788b73b0a08b527e23
ae481cce8335c02d9a67d7fa5de7ecf8
a0ef756f6b35748d77b0fda7dda6f4ae
fdd6639fee7e600a0378e4888a44625a
Yokoyama, H (Kent State University)
Tuesday 08 January 2013, 15:3016:30
Yokoyama, H (Kent State University)
Tuesday 08 January 2013, 15:3016:30
Cambridge University
3459
http://sms.cam.ac.uk/media/1387283
Molecular Origin of K13 Revisited
Yokoyama, H (Kent State University)
Tuesday 08 January 2013, 15:3016:30
Expanding a distortion free energy in terms of spatial gradients of density is a standard approach to construct an elastic theory of condensed matter. When applied to nematic liquid crystals, this socalled gradient expansion leads to the celebrated Frank theory that serves as the sound basis on which to analyze the response of nematic liquid crystals to electric fields and boundary constraints. The success of the theory has been thoroughly proven except the anomalous surface contribution associated with K13 (splaybend elasticity). The K13 term involves a gradient of the nematic director normal to the boundary, and hence the straightforward minimization of free energy under a given boundary condition becomes mathematically illposed, running into various unphysical behaviors.
More than a decade ago, I showed (at least I think I showed) that K13 is an artifact of gradient expansion as applied to a nonlocal interaction free energy by way of the density functional theory. When consistently done, the gradient expansion always results in K13=0 eliminating all the lingering problems that K13 has created.
The purpose of this talk is to revisit this issue. Close look at the K13 issue at the molecular level not only solves its own problem but also gives us a chance to shed new light on such fundamental structural characteristics of liquid crystals as chirality, flexoelectricity, and more.
20130115T11:22:06+00:00
3459
1387283
true
16x9
false
no

Monte Carlo simulations and Onsager density functional theory of hard particle liquid crystal models
ucs_sms_1383776_1408132
http://sms.cam.ac.uk/media/1408132
Monte Carlo simulations and Onsager density functional theory of hard particle liquid crystal models
Allen, M (University of Warwick)
Tuesday 05 February 2013, 14:0015:00
Mon, 11 Feb 2013 15:24:10 +0000
Isaac Newton Institute
Allen, M
fbc89f8c2711f1256ac2f9c58c593e01
5a54066e26109a8a719bf815310da194
ab7169fdd4a0a685b1ea62a41dbb05b9
e8deec7a3cb06b019f650a8ea73317ae
Allen, M (University of Warwick)
Tuesday 05 February 2013, 14:0015:00
Allen, M (University of Warwick)
Tuesday 05 February 2013, 14:0015:00
Cambridge University
4500
http://sms.cam.ac.uk/media/1408132
Monte Carlo simulations and Onsager density functional theory of hard particle liquid crystal models
Allen, M (University of Warwick)
Tuesday 05 February 2013, 14:0015:00
20130211T15:24:52+00:00
4500
1408132
true
4x3
false
no

Nematic braids: Effects of chirality and confinement
ucs_sms_1383776_1510886
http://sms.cam.ac.uk/media/1510886
Nematic braids: Effects of chirality and confinement
Zumer, S (University of Ljubljana)
Monday 24 June 2013, 14:4515:30
Wed, 03 Jul 2013 09:06:03 +0100
Isaac Newton Institute
Zumer, S
233301e5b0c4b6368125327ec2c27246
18f266e99f3b10ae5a72ead915344911
49730220e38100dafb536466ead0e8a9
e51741c50c6c8446e14fa14ab646cab0
Zumer, S (University of Ljubljana)
Monday 24 June 2013, 14:4515:30
Zumer, S (University of Ljubljana)
Monday 24 June 2013, 14:4515:30
Cambridge University
2940
http://sms.cam.ac.uk/media/1510886
Nematic braids: Effects of chirality and confinement
Zumer, S (University of Ljubljana)
Monday 24 June 2013, 14:4515:30
Nematic disclinations can form stable braids when they are stabilized by a confining geometry, chirality, or by interplay of both effects. These are stable or metastable topologically diverse defect structures in the nematic ordering field. Based on the synergy of our theoretical and numerical, approaches we are able to characterize geometries and properties of disclination loops forming braids by winding numbers, lengths, knot or link types, and selflinking numbers. We focus our attention to selected nematic braids of the lowest complexity: knotted 2D colloidal crystals, opal structures permeated by nematics, and knots in cholesteic drops. With this overview I would like to show how topology and geometry enables the assembling of complex soft materials. [1] S. ?opar and S. Žumer, Nematic Braids: Topological Invariants and Rewiring of Disclinations, Phys. Rev. Lett. 106, 177801 (2011). [2] S. ?opar, and S. Žumer, Quaternions and hybrid nematic disclinations, Proc. R. Soc. A 469, 1471 (2013). [3] U. Tkalec, M. Ravnik, S. ?opar, S. Žumer and I. Muševi?, Reconfigurable Knots and Links in Chiral Nematic Colloids, Science 333, 62 (2011). [4] S. ?opar, N. A. Clark, M. Ravnik and S. Žumer, Elementary building blocks of nematic disclination networks in densely packed 3D colloidal lattices, Soft Matter, DOI: 10.1039/C3SM50475A (2013).
20130703T17:29:43+01:00
2940
1510886
true
16x9
false
no

Nematics: how do they wet?
ucs_sms_1383776_1481227
http://sms.cam.ac.uk/media/1481227
Nematics: how do they wet?
Telo da Gama, M (Universidade de Lisboa)
Tuesday 23 April 2013, 14:0015:00
Tue, 14 May 2013 09:41:15 +0100
Isaac Newton Institute
Telo da Gama, M
8aab0057bc975b7b4f2c077e0283f195
ee3a3b2d51be89d7811fd1e3e0bcdb95
2918a5838c7a8a503f4e2a131cc62401
4465c14758b6f82b4809c89be8052014
Telo da Gama, M (Universidade de Lisboa)
Tuesday 23 April 2013, 14:0015:00
Telo da Gama, M (Universidade de Lisboa)
Tuesday 23 April 2013, 14:0015:00
Cambridge University
3840
http://sms.cam.ac.uk/media/1481227
Nematics: how do they wet?
Telo da Gama, M (Universidade de Lisboa)
Tuesday 23 April 2013, 14:0015:00
20130514T09:41:39+01:00
3840
1481227
true
4x3
false
no

New numerical scheme and simulations for undulations in smectic A liquid crystals
ucs_sms_1383776_1478549
http://sms.cam.ac.uk/media/1478549
New numerical scheme and simulations for undulations in smectic A liquid crystals
Joo, S (Old Dominion University)
Thursday 09 May 2013, 11:0012:00
Fri, 10 May 2013 14:11:05 +0100
Isaac Newton Institute
Joo, S
a3d071b245d8ead796bab39835c65d62
5b592ec0d60a336332b2930cd4cc9740
a0613e6f1fdd3044073d084279b27344
dcefda2bd45d0f2bda5d766385db7daa
Joo, S (Old Dominion University)
Thursday 09 May 2013, 11:0012:00
Joo, S (Old Dominion University)
Thursday 09 May 2013, 11:0012:00
Cambridge University
2663
http://sms.cam.ac.uk/media/1478549
New numerical scheme and simulations for undulations in smectic A liquid crystals
Joo, S (Old Dominion University)
Thursday 09 May 2013, 11:0012:00
20130510T14:11:29+01:00
2663
1478549
true
16x9
false
no

NMR Studies of DNA Aligned in DMPC/DHPC/CS Bicelle Mixtures
ucs_sms_1383776_1516565
http://sms.cam.ac.uk/media/1516565
NMR Studies of DNA Aligned in DMPC/DHPC/CS Bicelle Mixtures
Kozlyuk, N (University of California, Irvine)
Friday 05 July 2013, 10:1510:30
Thu, 11 Jul 2013 09:03:21 +0100
Isaac Newton Institute
Kozlyuk, N
6cdd4518525de8aa3e4502788ea96989
3b851f90a87c802c2a898d95dc2cae4e
231175f177124e6cd9fecd7dbca7a3d0
caaf7cf3fce6f4280874540b7f8eab17
Kozlyuk, N (University of California, Irvine)
Friday 05 July 2013, 10:1510:30
Kozlyuk, N (University of California, Irvine)
Friday 05 July 2013, 10:1510:30
Cambridge University
897
http://sms.cam.ac.uk/media/1516565
NMR Studies of DNA Aligned in DMPC/DHPC/CS Bicelle Mixtures
Kozlyuk, N (University of California, Irvine)
Friday 05 July 2013, 10:1510:30
20130711T09:03:46+01:00
897
1516565
true
16x9
false
no

Numerical Approximation of the Ericksen Leslie Equations
ucs_sms_1383776_1469463
http://sms.cam.ac.uk/media/1469463
Numerical Approximation of the Ericksen Leslie Equations
Walkington, N (Carnegie Mellon University)
Thursday 11 April 2013, 10:0011:00
Fri, 26 Apr 2013 12:00:21 +0100
Isaac Newton Institute
Walkington, N
8b06f3c5a00229802490758f6a9d3d8f
e5396f50287603749675bbf2e3266d77
2e6774bb1d39fd5c2ecf82f15451a8ef
3224ac0432a08187ba6651cdbc292aa1
Walkington, N (Carnegie Mellon University)
Thursday 11 April 2013, 10:0011:00
Walkington, N (Carnegie Mellon University)
Thursday 11 April 2013, 10:0011:00
Cambridge University
3039
http://sms.cam.ac.uk/media/1469463
Numerical Approximation of the Ericksen Leslie Equations
Walkington, N (Carnegie Mellon University)
Thursday 11 April 2013, 10:0011:00
The Ericksen Leslie equations model the motion of nematic liquid crytaline fluids. The equations comprise the linear and angular momentum equations with nonconvex constraints on the kinematic variables. These equations possess a Hamiltonian structure which reveals the subtle coupling of the two equations, and a delicate balance between inertia, transport, and dissipation. While a complete theory for the full nonlinear system is not yet available, many interesting subcases have been analyzed.
This talk will focus on the development and analysis of numerical schemes which inherit the Hamiltonian structure, and hence stability, of the continuous problem. In certain situations compactness properties of the discrete solutions can be established which guarantee convergence of schemes.
20130426T12:00:43+01:00
3039
1469463
true
4x3
false
no

On stability of radial hedgehog in Landau  de Gennes model
ucs_sms_1383776_1467493
http://sms.cam.ac.uk/media/1467493
On stability of radial hedgehog in Landau  de Gennes model
Slastikov, V (University of Bristol)
Tuesday 09 April 2013, 11:3012:30
Wed, 24 Apr 2013 09:25:58 +0100
Isaac Newton Institute
Slastikov, V
5f199a247bd9944c21035462cad058d1
9e9be6d0cba372f95dbcaa21ed859e93
c59d4aa820da5d117d7d4314d55b0d11
4dbbd2f84d77f8f34a1d3b3463adb117
Slastikov, V (University of Bristol)
Tuesday 09 April 2013, 11:3012:30
Slastikov, V (University of Bristol)
Tuesday 09 April 2013, 11:3012:30
Cambridge University
3780
http://sms.cam.ac.uk/media/1467493
On stability of radial hedgehog in Landau  de Gennes model
Slastikov, V (University of Bristol)
Tuesday 09 April 2013, 11:3012:30
We investigate stability of radially symmetric solutions in the context of Landau  de Gennes theory. It is well known that radial hedgehog is an unstable solution for low enough temperatures. We show that radial hedgehog is locally stable solution for temperatures close to isotropicnematic phase transition temperature.
20130424T09:26:20+01:00
3780
1467493
true
4x3
false
no

On the cubic instability in the Qtensor theory of nematics
ucs_sms_1383776_1387429
http://sms.cam.ac.uk/media/1387429
On the cubic instability in the Qtensor theory of nematics
Zarnescu, A (University of Sussex)
Wednesday 09 January 2013, 10:0010:40
Tue, 15 Jan 2013 13:46:37 +0000
Isaac Newton Institute
Zarnescu, A
818a19dae77a87b4e992fa59a9420a9d
13bffb0775ba277d1fa52894ae0e04b4
97e91aef33f942414dd7e3782612e15d
79acb8d21b3663685655a2c2fb80d52c
2857cf3a6c688a7fca84a611c3f059ec
Zarnescu, A (University of Sussex)
Wednesday 09 January 2013, 10:0010:40
Zarnescu, A (University of Sussex)
Wednesday 09 January 2013, 10:0010:40
Cambridge University
2431
http://sms.cam.ac.uk/media/1387429
On the cubic instability in the Qtensor theory of nematics
Zarnescu, A (University of Sussex)
Wednesday 09 January 2013, 10:0010:40
Symmetry considerations, as well as compatibility with the OseenFrank theory, require the presence of a cubic term (involving spatial derivatives) in the Qtensor energy functional used for describing variationally the nematics. However the presence of the cubic term makes the energy functional unbounded from below.
We propose a dynamical approach for addressing this issue, namely to consider the L^2 gradient flow generated by the energy functional and show that the energy is dynamically bounded, namely if one starts with a bounded, suitable, energy then the energy stays bounded in time. We discuss notions of suitability which are related to the preservation of a physical constraint on the eigenvalues of the Qtensors (without using the BallMajumdar singular potential).
This is joint work with G. Iyer and X. Xu (CarnegieMellon).
20130115T13:47:00+00:00
2431
1387429
true
16x9
false
no

On the MaierSaupe theory of Nematic liquid crystals
ucs_sms_1383776_1384397
http://sms.cam.ac.uk/media/1384397
On the MaierSaupe theory of Nematic liquid crystals
Zheng, X (Kent State University)
Tuesday 08 January 2013, 09:4010:20
Fri, 11 Jan 2013 16:53:10 +0000
Isaac Newton Institute
Zheng, X
9c096b84dbaf29393e3359c2851b37fd
dd892fb55da27efec4948cea19d40087
3c92e8fab9e5c34c4b91f061a18a59c5
b5c301b37ea333a95c51a5600b29c381
bb12368a1cbc57938eba00febc23a13d
Zheng, X (Kent State University)
Tuesday 08 January 2013, 09:4010:20
Zheng, X (Kent State University)
Tuesday 08 January 2013, 09:4010:20
Cambridge University
2055
http://sms.cam.ac.uk/media/1384397
On the MaierSaupe theory of Nematic liquid crystals
Zheng, X (Kent State University)
Tuesday 08 January 2013, 09:4010:20
MaierSaupe theory, the first successful theoretical model of thermotropic nematic liquid crystals (LCs), is a mean field description of a system of cylindrically symmetric particles interacting via London dispersion forces. The theory predicts a uniaxial nematic phase at low temperatures, and a first order phase transition to an isotropic fluid phase as the temperature is increased. In this talk, I will first give a brief introduction of the canonical MaierSaupe theory, then extend it to biaxial LC molecules, to inhomogeneous LCs, and to higher spatial dimensions, and discuss the relation between MaierSaupe and other main theories of LCs.
20130111T16:53:32+00:00
2055
1384397
true
16x9
false
no

Onsager  type theorias, where to from here?
ucs_sms_1383776_1387217
http://sms.cam.ac.uk/media/1387217
Onsager  type theorias, where to from here?
Fatkullin, I (University of Arizona)
Tuesday 08 January 2013, 11:3012:10
Tue, 15 Jan 2013 10:35:30 +0000
Isaac Newton Institute
Fatkullin, I
535b108a8d4969756496f7553229922d
9b7546d062b11894567849109cbd80a2
1a29c4909417e478f690937b53929eeb
103c7247fb8718ccfc04db0d918ee76e
9bf7ec4e25686055bc329687abc7f174
Fatkullin, I (University of Arizona)
Tuesday 08 January 2013, 11:3012:10
Fatkullin, I (University of Arizona)
Tuesday 08 January 2013, 11:3012:10
Cambridge University
3029
http://sms.cam.ac.uk/media/1387217
Onsager  type theorias, where to from here?
Fatkullin, I (University of Arizona)
Tuesday 08 January 2013, 11:3012:10
I will attempt to traverse the road from basic equations of molecular dynamics at the microscopic level to PDE dynamics at the level of coarsegrained order parameters, trying to clearly capture approximations and simplifications made along the way. My primary goal is to understand the relation of various mathematical frameworks to real liquid crystalline systems and to establish quantities most suitable for analysis of critical phenomena, defects, and symmetries in liquid crystalline systems.
20130115T10:35:51+00:00
3029
1387217
true
16x9
false
no

Onsager's Variational Principle in Soft Matter Dynamics
ucs_sms_1383776_1387547
http://sms.cam.ac.uk/media/1387547
Onsager's Variational Principle in Soft Matter Dynamics
Doi, M (Toyota Physical and Chemical Research Institute)
Wednesday 09 January 2013, 13:3014:30
Tue, 15 Jan 2013 17:39:25 +0000
Isaac Newton Institute
Doi, M
b578d3687fd5a9e718624edd37cd136f
d8644e42671629f5978a7f779ee6a78b
151a761e035dcde6bea3c44785c36c85
772d9208862ab2ab34007376d1d04485
6a4c360a5ecb956f7e822e8124dc6170
Doi, M (Toyota Physical and Chemical Research Institute)
Wednesday 09 January...
Doi, M (Toyota Physical and Chemical Research Institute)
Wednesday 09 January 2013, 13:3014:30
Cambridge University
4020
http://sms.cam.ac.uk/media/1387547
Onsager's Variational Principle in Soft Matter Dynamics
Doi, M (Toyota Physical and Chemical Research Institute)
Wednesday 09 January 2013, 13:3014:30
In the celebrated paper on the reciprocal relation for the kinetic coefficients in irreversible processes, Onsager extended Rayleigh's principle of the least energy dissipation to general irreversible processes. In this presentation, I shall show that this variational principle is very convenient in considering the nonlinear and nonequilibrium phenomena in soft matter. I will discuss this using the examples of (i) viscoelasticity of colloidal suspensions and polymer solutions, (ii)diffusionmechanical coupling in polymer solutions and gels, and (iii) nematohydrodynamics etc.
20130115T17:39:53+00:00
4020
1387547
true
16x9
false
no

Open Problems Session
ucs_sms_1383776_1487093
http://sms.cam.ac.uk/media/1487093
Open Problems Session
Bowick, M (Syracuse)
Tuesday 21 May 2013, 12:1012:30
Fri, 24 May 2013 11:12:40 +0100
Isaac Newton Institute
Bowick, M
49c7e3060940c25823e197b124749968
b56a8626eb4c7ca2be2062d6e90bcac1
cf74fa0a7b05880348d97e8eda1399d6
810b99e9dc6430f10254abcfe7c58b7e
Bowick, M (Syracuse)
Tuesday 21 May 2013, 12:1012:30
Bowick, M (Syracuse)
Tuesday 21 May 2013, 12:1012:30
Cambridge University
1592
http://sms.cam.ac.uk/media/1487093
Open Problems Session
Bowick, M (Syracuse)
Tuesday 21 May 2013, 12:1012:30
20130524T11:13:04+01:00
1592
1487093
true
16x9
false
no

Open Problems Session
ucs_sms_1383776_1487261
http://sms.cam.ac.uk/media/1487261
Open Problems Session
Virga, E (Università degli Studi di Pavia)
Tuesday 21 May 2013, 16:2016:40
Fri, 24 May 2013 14:42:53 +0100
Isaac Newton Institute
Virga, E
c436317e85f043588c3458e344258968
69983227ae31a4087e976623c3c3fd99
13deb4c55a59706f61bd84fba5acc76b
632293e3c77ebf7a17c8751acc2ceee7
Virga, E (Università degli Studi di Pavia)
Tuesday 21 May 2013, 16:2016:40
Virga, E (Università degli Studi di Pavia)
Tuesday 21 May 2013, 16:2016:40
Cambridge University
1951
http://sms.cam.ac.uk/media/1487261
Open Problems Session
Virga, E (Università degli Studi di Pavia)
Tuesday 21 May 2013, 16:2016:40
20130524T14:43:18+01:00
1951
1487261
true
16x9
false
no

Open Problems Session
ucs_sms_1383776_1487276
http://sms.cam.ac.uk/media/1487276
Open Problems Session
Newton, C (University of Bristol)
Tuesday 21 May 2013, 16:4017:00
Fri, 24 May 2013 14:53:10 +0100
Isaac Newton Institute
Newton, C
3f968ea9fc243f3c203329147b909bcc
d0cb6f11e52b065cbe20d843e8fefc5b
37673ef6ad0f4c1d254d4821e5bcb258
47a6077421d31f24f683f4b50599f4dc
Newton, C (University of Bristol)
Tuesday 21 May 2013, 16:4017:00
Newton, C (University of Bristol)
Tuesday 21 May 2013, 16:4017:00
Cambridge University
1541
http://sms.cam.ac.uk/media/1487276
Open Problems Session
Newton, C (University of Bristol)
Tuesday 21 May 2013, 16:4017:00
20130524T14:53:36+01:00
1541
1487276
true
16x9
false
no

Open problems session
ucs_sms_1383776_1489096
http://sms.cam.ac.uk/media/1489096
Open problems session
Sluckin, T (University of Southampton)
Wednesday 22 May 2013, 14:0014:20
Tue, 28 May 2013 10:05:18 +0100
Isaac Newton Institute
Sluckin, T
7157b955982b7497ae550246f4bc2a76
ff48de1cb93066a81dc6c5887c6b9c2b
c919b5b061c753cf154fb81dc7c0e388
6ae3f506125b1fb156d6dc34abd49104
Sluckin, T (University of Southampton)
Wednesday 22 May 2013, 14:0014:20
Sluckin, T (University of Southampton)
Wednesday 22 May 2013, 14:0014:20
Cambridge University
1603
http://sms.cam.ac.uk/media/1489096
Open problems session
Sluckin, T (University of Southampton)
Wednesday 22 May 2013, 14:0014:20
20130528T10:05:42+01:00
1603
1489096
true
16x9
false
no

Open Problems Session
ucs_sms_1383776_1489112
http://sms.cam.ac.uk/media/1489112
Open Problems Session
De Simone, A (SISSA)
Wednesday 22 May 2013, 14:4015:00
Tue, 28 May 2013 10:18:23 +0100
Isaac Newton Institute
De Simone, A
9959fd2ca715da302552b3b1d0ed2310
80302e41ad4dc011abf804a26e69bacc
6194a3971e0ce7bd6e920be4f6ccbf10
1b7962e2e7a79e2c3720e4e4758aec26
De Simone, A (SISSA)
Wednesday 22 May 2013, 14:4015:00
De Simone, A (SISSA)
Wednesday 22 May 2013, 14:4015:00
Cambridge University
1927
http://sms.cam.ac.uk/media/1489112
Open Problems Session
De Simone, A (SISSA)
Wednesday 22 May 2013, 14:4015:00
20130530T12:05:35+01:00
1927
1489112
true
16x9
false
no

Open Problems Session
ucs_sms_1383776_1489234
http://sms.cam.ac.uk/media/1489234
Open Problems Session
Lubensky, T (University of Pennsylvania)
Wednesday 22 May 2013, 14:2014:40
Tue, 28 May 2013 13:42:13 +0100
Isaac Newton Institute
Lubensky, T
33cc2a1d2f6e7b83aab61e9b96ebae1d
61a07a64599957bc2e96bb4326041223
d3001f8df21c0cafb1dc7798c09cfff2
e0f038fb1e7fa9e8253b10fc67c2f24b
Lubensky, T (University of Pennsylvania)
Wednesday 22 May 2013, 14:2014:40
Lubensky, T (University of Pennsylvania)
Wednesday 22 May 2013, 14:2014:40
Cambridge University
1813
http://sms.cam.ac.uk/media/1489234
Open Problems Session
Lubensky, T (University of Pennsylvania)
Wednesday 22 May 2013, 14:2014:40
20130530T12:02:27+01:00
1813
1489234
true
16x9
false
no

Order tensors of equilibrium phases
ucs_sms_1383776_1384154
http://sms.cam.ac.uk/media/1384154
Order tensors of equilibrium phases
Virga, EG (Università degli Studi di Pavia)
Monday 07 January 2013, 14:0015:00
Fri, 11 Jan 2013 11:47:17 +0000
Isaac Newton Institute
Virga, EG
2836b9b26d272427439cf6f05f3c4196
e77e5380b6afcfed3714791e274bdbbd
638c2d492264fd9276143fc387bafc9f
6bf4e7036a90101b92b6a121f2e526f0
96574afc736c0f128a186d94ef257a4f
Virga, EG (Università degli Studi di Pavia)
Monday 07 January 2013, 14:0015:00
Virga, EG (Università degli Studi di Pavia)
Monday 07 January 2013, 14:0015:00
Cambridge University
4126
http://sms.cam.ac.uk/media/1384154
Order tensors of equilibrium phases
Virga, EG (Università degli Studi di Pavia)
Monday 07 January 2013, 14:0015:00
Order in fluids is described by means of tensorial measures which have in general a statistical derivation, as appropriate moments of a molecular distribution function. Their very definition places order tensors at the crossroad between microscopic and macroscopic approaches, in that land of middle where "mesoscopic" theories flourish. We shall give specific examples of how different order tensors can describe the equilibrium phases of different ordered fluids. Both uniaxial and biaxial nematic liquid crystals will be covered, as well as smectic liquid crystals, thus showing how both orientational and spatial orderings can be represented in one and the same setting. Our presentation will not be limited to phases in bulk; ordering at interfaces will also be considered along with the ways it can be affected by the surface curvature. Similarly, ordering of fluids on twodimensional curved manifolds will be described, and an "augmented" theory will be presente d for nematic shells, which to the inplane orientational order adds information on the escape of molecules along the shell's normal.
20130111T11:47:38+00:00
4126
1384154
true
16x9
false
no

Overviews of other MLC workshops
ucs_sms_1383776_1388418
http://sms.cam.ac.uk/media/1388418
Overviews of other MLC workshops
Warner, M; Osipov, M; Ball, J (Cambridge/Strathclyde/Oxford)
Friday 11 January 2013, 13:3014:00
Wed, 16 Jan 2013 14:06:14 +0000
Isaac Newton Institute
Isaac Newton Institute
381f8265e262387b646aaae6bfad35cc
876de716ad352113c15284df6580358b
2df0ead0eea70990fa890d452d3864d1
af314045012dbb40f1debda76ff53f54
15585eabe6e761e2ed7740260b0b4fd9
Warner, M; Osipov, M; Ball, J (Cambridge/Strathclyde/Oxford)
Friday 11 January...
Warner, M; Osipov, M; Ball, J (Cambridge/Strathclyde/Oxford)
Friday 11 January 2013, 13:3014:00
Cambridge University
1340
http://sms.cam.ac.uk/media/1388418
Overviews of other MLC workshops
Warner, M; Osipov, M; Ball, J (Cambridge/Strathclyde/Oxford)
Friday 11 January 2013, 13:3014:00
Liquid crystal (LC) phases were first identified and even named by their topological defects. The rich interplay between geometry, topology and optics is ubiquitous through all liquid crystals. Workshop 4 (WS4) addresses the characterisation of defects, their essential appearance in complex systems such as colloidal liquid crystals, how they template complex structures, and their special character in nonsimple spaces (such as those with Gaussian curvature). WS4 is concerned with solid liquid crystals, both elastomers where the director remains mobile, and glasses where the director is pinned to the material frame. The unique mechanics of solid liquid crystals leads to new phenomena, some of which are described by techniques of quasiconvexification first exploited in Martensites. Their mechanics connects with the defects theme since topological defects in LC solids, on illumination or temperature change, cause changes in Gaussian curvature or topology. WS4 also pursues active nematics, their connections with solid nematics, and the role of defects in active systems.
I shall review the themes of the workshop, concentrating on those less familiar to liquid crystal specialists.
20130116T14:06:33+00:00
1340
1388418
true
16x9
false
no

Phase behaviour in mixtures of unixial hard particles: biaxiality and confinement
ucs_sms_1383776_1443630
http://sms.cam.ac.uk/media/1443630
Phase behaviour in mixtures of unixial hard particles: biaxiality and confinement
Galindo, A (Imperial College London)
Wednesday 20 March 2013, 11:0011:50
Thu, 21 Mar 2013 11:59:31 +0000
Isaac Newton Institute
Galindo, A
8c4247f2aa2e7355a56bde88fc6ad87b
50b32e881c4baef22e6d7f6e09990197
bdf3678806fdd2a5702cb09666ceb804
99362c74a262d3331e800ccd5cd7e331
Galindo, A (Imperial College London)
Wednesday 20 March 2013, 11:0011:50
Galindo, A (Imperial College London)
Wednesday 20 March 2013, 11:0011:50
Cambridge University
2704
http://sms.cam.ac.uk/media/1443630
Phase behaviour in mixtures of unixial hard particles: biaxiality and confinement
Galindo, A (Imperial College London)
Wednesday 20 March 2013, 11:0011:50
The nematic biaxial phase has remained a key challenge in the science of liquid crystals since it was first proposed. Recently the first experimental evidence of stable biaxial nematic phases has been obtained in thermotropic liquid crystals of single component biaxial mesogens by Madsen et al., and others. Still elusive however is the possibility of stabilizing biaxial nematic phases in mixtures of uniaxial particles. This avenue has been explored in some detail using theory and computer simulation, but leads one to the conclusion that, at least in the case of mixtures of hard particles, the nematic biaxial phase is thermodynamically unstable with respect to demixing into two uniaxial phases. Theoretical calculations have, however, pointed out that with an appropriate attractive unlike interaction, a homogeneous biaxial nematic phase could be stabilized. Experimental work on mixtures of rod and disclike molecules has tended to confirm the view that such a system would favou r phase separation, until the recent studies of Apreutesei and Mehl. In this contribution, we use canonical Monte Carlo molecular simulations to study model mixtures of rodlike and disklike molecules interacting through two intermolecular potential models: one incorporating spherically symmetric (isotropic) attractive interactions; another with anisotropic attractive interactions. These models exhibit nematic and smectic biaxial phases. In the final part of the talk, if time allows, I will briefly discuss the changes in the phase behavior that occur when uniaxial disclike particles are placed in confinement between parallel walls and consider the surface ordering and capillary phenomena in this system.
20130321T11:59:53+00:00
2704
1443630
true
16x9
false
no

PhotoActuation in LC Glass
ucs_sms_1383776_1511013
http://sms.cam.ac.uk/media/1511013
PhotoActuation in LC Glass
Modes, C (Rockefeller University)
Friday 28 June 2013, 09:4510:30
Wed, 03 Jul 2013 10:10:54 +0100
Isaac Newton Institute
Modes, C
77e90702bb9a4db29a1b48f97a217625
5cb56540846f3e67663ce3a04100e6c3
f410b69397d9b92bcbb1811d20f015e3
8bf63e09e202c94257bc5dd8fbc301ec
Modes, C (Rockefeller University)
Friday 28 June 2013, 09:4510:30
Modes, C (Rockefeller University)
Friday 28 June 2013, 09:4510:30
Cambridge University
2521
http://sms.cam.ac.uk/media/1511013
PhotoActuation in LC Glass
Modes, C (Rockefeller University)
Friday 28 June 2013, 09:4510:30
20130704T10:40:44+01:00
2521
1511013
true
16x9
false
no

Photoelastomers
ucs_sms_1383776_1511020
http://sms.cam.ac.uk/media/1511020
Photoelastomers
Warner, M (University of Cambridge)
Friday 28 June 2013, 11:0011:30
Mon, 08 Jul 2013 11:08:02 +0100
Isaac Newton Institute
Warner, M
3591274afc85c10ff29cb7235839c0b0
d2dd1205d2cac009b180adffa9bb7f7a
9fa35f20103b619758eaee6bc9718c07
be4fcda569a91346b12bedcb8d207ef6
Warner, M (University of Cambridge)
Friday 28 June 2013, 11:0011:30
Warner, M (University of Cambridge)
Friday 28 June 2013, 11:0011:30
Cambridge University
3079
http://sms.cam.ac.uk/media/1511020
Photoelastomers
Warner, M (University of Cambridge)
Friday 28 June 2013, 11:0011:30
20130708T16:48:06+01:00
3079
1511020
true
16x9
false
no

Photonic Liquid Crystal Fiber Interferometer
ucs_sms_1383776_1516986
http://sms.cam.ac.uk/media/1516986
Photonic Liquid Crystal Fiber Interferometer
Poudereux Sánchez, D (Technical University of Madrid)
Friday 05 July 2013, 11:4512:00
Thu, 11 Jul 2013 12:51:13 +0100
Isaac Newton Institute
Poudereux Sánchez, D
e9f2bc791510f5f103079bf0a7f3910d
62799eef71a850612458730b959c6405
1f9cf36ebc2ba417ea63ff5dd44e6ee9
b0d424d52b21420a6778cea69642e718
Poudereux Sánchez, D (Technical University of Madrid)
Friday 05 July 2013,...
Poudereux Sánchez, D (Technical University of Madrid)
Friday 05 July 2013, 11:4512:00
Cambridge University
539
http://sms.cam.ac.uk/media/1516986
Photonic Liquid Crystal Fiber Interferometer
Poudereux Sánchez, D (Technical University of Madrid)
Friday 05 July 2013, 11:4512:00
20130711T12:51:40+01:00
539
1516986
true
16x9
false
no

Photorefractive effect and two beam energy exchange in hybrid liquid crystal cells
ucs_sms_1383776_1489790
http://sms.cam.ac.uk/media/1489790
Photorefractive effect and two beam energy exchange in hybrid liquid crystal cells
Pinkevych, I (Taras Shevchenko National University of Kyiv)
Thursday 23 May 2013, 12:0013:00
Wed, 29 May 2013 10:02:40 +0100
Isaac Newton Institute
Pinkevych, I
45d87e0eff125dfc0888976dd489df0c
741be93a388c38c02c07b7db0a1350ec
56c5cdcd164129d22b0656f3c7cbf971
e8dd625dd03cd149c717d73f50533bcf
Pinkevych, I (Taras Shevchenko National University of Kyiv)
Thursday 23 May...
Pinkevych, I (Taras Shevchenko National University of Kyiv)
Thursday 23 May 2013, 12:0013:00
Cambridge University
2541
http://sms.cam.ac.uk/media/1489790
Photorefractive effect and two beam energy exchange in hybrid liquid crystal cells
Pinkevych, I (Taras Shevchenko National University of Kyiv)
Thursday 23 May 2013, 12:0013:00
Hybrid organicinorganic photorefractive cells possess many advantages among photorefractive systems. In such cells a liquid crystal (LC) is sandwiched between two photorefractive layers. The interfering incident light beams induce a periodic spacecharge field in the photorefractive layers. Spacecharge electric fields leak into the adjacent LC, causing director modulation, and hence the diffraction grating. Each light beam diffracts from the induced grating, leading to energy gain and loss within each beam.
We developed a theoretical model to describe twobeam energy exchange in a hybrid nematic cell and calculated the energy gain of the weak beam, as a result of its interaction with the pump beam. In the theory, the flexoelectric mechanism for electric fielddirector coupling is a more important than the LC static dielectric anisotropy coupling. Thus, flexoelectricity is the main physical mechanism governing the magnitude of the director grating and the twobeam coupling. The LC optics is described in the Bragg regime.
The theory has been compared with results of an experimental study on hybrid cells filled with the LC mixture TL 205. Experimentally the energy gain is maximal at much lower grating wave numbers than is predicted by naïve theory. However, if the director reorientation is cubic rather than linear in the spacecharge field term, then good agreement between theory and experiment can be achieved using only a single fitting parameter. We provide a semiquantitative argument to justify this nonlinearity in terms of electricfieldinduced local phase separation between different components of the liquid crystal.
Hybrid cholesteric systems exhibit extra features not observed in hybrid nematic cells. Specifically, the gain coefficient changes sign as a function of grating spacing. Following the paradigm used for hybrid nematic cells we developed a theory for the optical gain characteristics of hybrid cholesteric cells. Theoretical results for exponential gain coefficients have been compared with experimental results for hybrid cells filled with cholesteric mixtures TL205/CB15 and BL038/CB15. In order to reconcile theory and experiment, we require that near the cell surface, nematic ordering must dominate. Under this supposition, we are able to fit experimental data to theory for both cholesteric mixtures, subject to the use of some fitting parameters. This provides good evidence that the key physics of the system has been correctly identified.
*(joint work with Victor Reshetnyak, Tim Sluckin, Gary Cook, and Dean Evans)
20130529T10:03:06+01:00
2541
1489790
true
16x9
false
no

Polar Active LCs: Nonequilibrium steady states and fluctuations
ucs_sms_1383776_1507530
http://sms.cam.ac.uk/media/1507530
Polar Active LCs: Nonequilibrium steady states and fluctuations
Liverpool, T (University of Bristol)
Tuesday 25 June 2013, 11:4512:30
Fri, 28 Jun 2013 14:51:14 +0100
Isaac Newton Institute
Liverpool, T
21d6300d102fb7f028db590fa210f223
9aacfd4d6550355efbcedb4d5aa9cb58
53ed7d0ede2a426cb387756e24a1f50c
2e30d3e91fd3bd5eeb2214f0d5babfbe
Liverpool, T (University of Bristol)
Tuesday 25 June 2013, 11:4512:30
Liverpool, T (University of Bristol)
Tuesday 25 June 2013, 11:4512:30
Cambridge University
2759
http://sms.cam.ac.uk/media/1507530
Polar Active LCs: Nonequilibrium steady states and fluctuations
Liverpool, T (University of Bristol)
Tuesday 25 June 2013, 11:4512:30
20130628T17:51:17+01:00
2759
1507530
true
16x9
false
no

Polar Active Liquid Crystals : microscopics, hydrodynamics and rheology
ucs_sms_1383776_1469687
http://sms.cam.ac.uk/media/1469687
Polar Active Liquid Crystals : microscopics, hydrodynamics and rheology
Liverpool, T (University of Bristol)
Friday 12 April 2013, 10:0011:00
Fri, 26 Apr 2013 12:57:21 +0100
Isaac Newton Institute
Liverpool, T
f6d22dd468394dcd324312741f0a591e
f63c60758b4de8f70e56ad18848fed47
68133632a01a6bb20e99f6689f6af290
404cc625031e7362e10e9cff22502b24
Liverpool, T (University of Bristol)
Friday 12 April 2013, 10:0011:00
Liverpool, T (University of Bristol)
Friday 12 April 2013, 10:0011:00
Cambridge University
3564
http://sms.cam.ac.uk/media/1469687
Polar Active Liquid Crystals : microscopics, hydrodynamics and rheology
Liverpool, T (University of Bristol)
Friday 12 April 2013, 10:0011:00
Colonies of swimming bacteria, mixtures of cytoskeletal protein filaments and motor proteins, and vibrated granular rods are examples of active systems composed of interacting units that consume energy and collectively generate motion and mechanical stresses. Due to their elongated shape, active particles can exhibit orientational order at high concentration and have been likened to ``living liquid crystals". Their rich collective behavior includes nonequilibrium phase transitions and pattern formation on mesoscopic scales. I will describe and summarise recent theoretical results characterising the behaviour of such soft active systems.
20130426T12:57:48+01:00
3564
1469687
true
4x3
false
no

Polyelectrolyte gels: modeling chemomechanical interaction
ucs_sms_1383776_1406175
http://sms.cam.ac.uk/media/1406175
Polyelectrolyte gels: modeling chemomechanical interaction
Calderer, C (University of Minnesota)
Tuesday 22 January 2013, 14:0015:00
Thu, 07 Feb 2013 17:04:56 +0000
Isaac Newton Institute
Calderer, C
5845334c55109de03d7da5b5ac17316e
2e1431acfea3dfabf51d72861f002701
aab7df40253c3846672378183bc319b7
409c3eb6c2163482fd7fed2d30d4f8ae
Calderer, C (University of Minnesota)
Tuesday 22 January 2013, 14:0015:00
Calderer, C (University of Minnesota)
Tuesday 22 January 2013, 14:0015:00
Cambridge University
4200
http://sms.cam.ac.uk/media/1406175
Polyelectrolyte gels: modeling chemomechanical interaction
Calderer, C (University of Minnesota)
Tuesday 22 January 2013, 14:0015:00
20130207T17:05:20+00:00
4200
1406175
true
16x9
false
no

Probing Liquid Crystal Elastomer Structure with Polarized Light Scattering
ucs_sms_1383776_1516583
http://sms.cam.ac.uk/media/1516583
Probing Liquid Crystal Elastomer Structure with Polarized Light Scattering
Pevnyi, M (Kent State University)
Friday 05 July 2013, 11:0011:15
Thu, 11 Jul 2013 12:40:36 +0100
Isaac Newton Institute
Pevnyi, M
b296665da5b0bf27ed5ce08cc8e3dd86
1569059f98415ce7a8ced91a7b5d1d1c
e335df781082deec362a34056aa49d08
abcaf25b93cda5ed8e0021199e5f299c
Pevnyi, M (Kent State University)
Friday 05 July 2013, 11:0011:15
Pevnyi, M (Kent State University)
Friday 05 July 2013, 11:0011:15
Cambridge University
1015
http://sms.cam.ac.uk/media/1516583
Probing Liquid Crystal Elastomer Structure with Polarized Light Scattering
Pevnyi, M (Kent State University)
Friday 05 July 2013, 11:0011:15
20130711T12:41:14+01:00
1015
1516583
true
16x9
false
no

Problems related to defects in nematic liquid crystals
ucs_sms_1383776_1387472
http://sms.cam.ac.uk/media/1387472
Problems related to defects in nematic liquid crystals
Bauman, P (Purdue University)
Wednesday 09 January 2013, 10:4011:20
Tue, 15 Jan 2013 15:27:52 +0000
Isaac Newton Institute
Bauman, P
b5ab49e47df36c3f040ad03badd33fcd
6db10f1bbbe9dde56d933110a1802c36
bf43e2fab04554d4686a88197d9b552f
811f3252a3b3fb32f4c5bb86f64abcac
2c7b22e58d55a665052e1af0fc18d748
Bauman, P (Purdue University)
Wednesday 09 January 2013, 10:4011:20
Bauman, P (Purdue University)
Wednesday 09 January 2013, 10:4011:20
Cambridge University
2411
http://sms.cam.ac.uk/media/1387472
Problems related to defects in nematic liquid crystals
Bauman, P (Purdue University)
Wednesday 09 January 2013, 10:4011:20
We describe several problems involving defects in liquid crystals and a mathematical framework in terms of tensors or directors that allows us to analyze the nature of defects in energy minimizing configurations.
20130115T15:28:15+00:00
2411
1387472
true
16x9
false
no

Projectionoperator formalism, BBGKY hierarchy, and kinetic equations. Part 2
ucs_sms_1383776_1458993
http://sms.cam.ac.uk/media/1458993
Projectionoperator formalism, BBGKY hierarchy, and kinetic equations. Part 2
Fatkullin , I (University of Arizona)
Friday 05 April 2013, 11:0012:00
Thu, 11 Apr 2013 15:56:22 +0100
Isaac Newton Institute
Fatkullin , I
e10c4b1752fb1dff0939a68ed682ccf5
a182c63cdda95da36ae3d9b855304b06
0d49a5753ab13f26f21b4a80754d8539
275e81438741eee08aed0fc053b50486
Fatkullin , I (University of Arizona)
Friday 05 April 2013, 11:0012:00
Fatkullin , I (University of Arizona)
Friday 05 April 2013, 11:0012:00
Cambridge University
4620
http://sms.cam.ac.uk/media/1458993
Projectionoperator formalism, BBGKY hierarchy, and kinetic equations. Part 2
Fatkullin , I (University of Arizona)
Friday 05 April 2013, 11:0012:00
20130411T15:56:44+01:00
4620
1458993
true
4x3
false
no

Projectionoperator formalism, BBGKY hierarchy, and kinetic equations. Part I
ucs_sms_1383776_1458841
http://sms.cam.ac.uk/media/1458841
Projectionoperator formalism, BBGKY hierarchy, and kinetic equations. Part I
Fatkullin, I (University of Arizona)
Wednesday 03 April 2013, 11:0012:00
Thu, 11 Apr 2013 12:38:54 +0100
Isaac Newton Institute
Fatkullin, I
3e993d7450ec86223e6799ea01952d74
df4a7d59ec65ab38aca1bde0f242e125
d5e1620abafbcc17f5a30a924b6f7ea1
845d659de718ef79356797c78e6bf622
Fatkullin, I (University of Arizona)
Wednesday 03 April 2013, 11:0012:00
Fatkullin, I (University of Arizona)
Wednesday 03 April 2013, 11:0012:00
Cambridge University
4500
http://sms.cam.ac.uk/media/1458841
Projectionoperator formalism, BBGKY hierarchy, and kinetic equations. Part I
Fatkullin, I (University of Arizona)
Wednesday 03 April 2013, 11:0012:00
20130411T12:39:15+01:00
4500
1458841
true
4x3
false
no

Pure and Applied Focal Conics
ucs_sms_1383776_1510824
http://sms.cam.ac.uk/media/1510824
Pure and Applied Focal Conics
Kamien, R (University of Pennsylvania)
Monday 24 June 2013, 11:0012:00
Wed, 03 Jul 2013 08:58:21 +0100
Isaac Newton Institute
Kamien, R
a072d3bee1622d042d7dc02e85a66b7e
c81358e906551e639460396be658ede9
ad02c6632bc2a1b9e99c9fbae59f876a
7b7279a2c06037ba810639fbad030f36
Kamien, R (University of Pennsylvania)
Monday 24 June 2013, 11:0012:00
Kamien, R (University of Pennsylvania)
Monday 24 June 2013, 11:0012:00
Cambridge University
3600
http://sms.cam.ac.uk/media/1510824
Pure and Applied Focal Conics
Kamien, R (University of Pennsylvania)
Monday 24 June 2013, 11:0012:00
The epitaxial assembly of toric focal conic domain (TFCD) arrays of smecticA liquid crystals onto pillar arrays is studied. The 3D nature of the pillar array is crucial to confine and direct the formation of TFCDs on the top of each pillar and between neighboring pillars, leading to highly ordered square and hexagonal array TFCDs persisting deeply into the bulk.
20130703T17:23:35+01:00
3600
1510824
true
16x9
false
no

Radial symmetry and biaxiality in nematic liquid crystals
ucs_sms_1383776_1467600
http://sms.cam.ac.uk/media/1467600
Radial symmetry and biaxiality in nematic liquid crystals
Henao, DA (Pontificia Universidad Católica de Chile)
Tuesday 09 April 2013, 16:0016:30
Wed, 24 Apr 2013 09:59:38 +0100
Isaac Newton Institute
Henao, DA
a394dea3522452a7fc845d0814431e86
ab2c310d32c4c9a8caaff3ca87aa202c
5460a45361f578f0e52f47554df8258d
75f4e0daab5afdbc3304cd3a1f868c4b
Henao, DA (Pontificia Universidad Católica de Chile)
Tuesday 09 April 2013,...
Henao, DA (Pontificia Universidad Católica de Chile)
Tuesday 09 April 2013, 16:0016:30
Cambridge University
2035
http://sms.cam.ac.uk/media/1467600
Radial symmetry and biaxiality in nematic liquid crystals
Henao, DA (Pontificia Universidad Católica de Chile)
Tuesday 09 April 2013, 16:0016:30
We study the model problem of a nematic liquid crystal confined to a spherical droplet subject to radial anchoring conditions, in the context of the Landaude Gennes continuum theory. Based on the recent radial symmetry result by Millot & Pisante (J. Eur. Math. Soc. 2010) and Pisante (J. Funct. Anal. 2011) for the vectorvalued GinzburgLandau equations in threedimensional superconductivity theory, we prove that global Landaude Gennes minimizers in the class of uniaxial Qtensors converge, in the lowtemperature limit, to the radialhegdehog solution of the tensorvalued GinzburgLandau equations. Combining this with the result by Majumdar (Eur. J. App. Math. 2012) and by Gartland & Mkaddem (Phys. Rev. E. 1999) that the radialhedgehog equilibrium is unstable under biaxial perturbations, we obtain the nonpurely uniaxial character of global minimizers for sufficiently low temperatures.
20130424T10:00:04+01:00
2035
1467600
true
4x3
false
no

Random packing of mixtures of hard rods and spheres
ucs_sms_1383776_1445921
http://sms.cam.ac.uk/media/1445921
Random packing of mixtures of hard rods and spheres
Ferreiro, C (University of Bristol)
Friday 22 March 2013, 14:4015:00
Mon, 25 Mar 2013 10:39:08 +0000
Isaac Newton Institute
Ferreiro, C
fd6c87f884ec6c9781c70aa88cfd08a2
05039e5757ecccb667c85437c4f48407
d20eb7bda956a9c958ee5eec76911374
f13748e2ae6720ac7e4545ebc45d4197
Ferreiro, C (University of Bristol)
Friday 22 March 2013, 14:4015:00
Ferreiro, C (University of Bristol)
Friday 22 March 2013, 14:4015:00
Cambridge University
914
http://sms.cam.ac.uk/media/1445921
Random packing of mixtures of hard rods and spheres
Ferreiro, C (University of Bristol)
Friday 22 March 2013, 14:4015:00
Random packing of mixtures of hard spherocylinders and hard spheres are studied for d≈L, where L is the length of the spherocylinder and d the diameter of the spheres. Packing fractions of mixtures of hard spherocylindres with aspect ratios 4<L/D<20 and how this packing fraction changes with different concentrations of spheres are investigated. The results obtained are compared with observations of mixtures of sterically stabilized rodlike particles and spheres. These colloidal suspensions of rodlike particles are made with sepiolite clays and have previously been found to show liquid crystal behaviour [1]. The addition of spheres to a colloidal rod suspension affects the isotropicnematic phase transition that occurs in pure suspensions. One might expect that the addition of spheres would lead to a wide phase gap between rodrich and sphererich phases [2]. An experimental study did find some evidence for nematic rod domains with spheres accumulating at their grain boundaries [3]. Very easily however these systems got stuck in gel states consisting of (bundles of) rods trapping spheres [3]. Rather than trying to calculate equilibrium phase diagrams, we are therefore investigating random close packed configurations which may resemble the experimental observations more closely.
References [1] Z. X. Zhang and J. S. van Duijneveldt, J. Chem. Phys., 124, 154910 (2006). [2] Henk N.W. Lekkerkerker and Remco Tuinier, Colloids and the Depletion Interaction, Springer, 2011. [3] N. Yasarawan and J.S. van Duijneveldt, Soft Matter, 6, 353362 (2010).
20130325T10:39:36+00:00
914
1445921
true
16x9
false
no

Random packing of rods and spheres
ucs_sms_1383776_1487372
http://sms.cam.ac.uk/media/1487372
Random packing of rods and spheres
Ferreiro, C (Bristol)
Wednesday 22 May 2013, 09:2009:40
Fri, 24 May 2013 16:14:50 +0100
Isaac Newton Institute
Ferreiro, C
497dedf06b398bdb359aacaca17950e4
2f61dd24bfcb9bf566849d86d353a6fe
e7a009c38af560bbd3f6b347d7f8ae73
89beeefa30fd089e49b43b25af7e7585
Ferreiro, C (Bristol)
Wednesday 22 May 2013, 09:2009:40
Ferreiro, C (Bristol)
Wednesday 22 May 2013, 09:2009:40
Cambridge University
1273
http://sms.cam.ac.uk/media/1487372
Random packing of rods and spheres
Ferreiro, C (Bristol)
Wednesday 22 May 2013, 09:2009:40
Random packing of mixtures of hard spherocylinders and hard spheres are studied for spheres with a diameter similar to the length of the spherocylinders.
20130524T16:15:16+01:00
1273
1487372
true
16x9
false
no

Reconfigurable assemblies of active, autochemotactic gels
ucs_sms_1383776_1509458
http://sms.cam.ac.uk/media/1509458
Reconfigurable assemblies of active, autochemotactic gels
Balazs, A (University of Pittsburgh)
Thursday 27 June 2013, 14:4515:30
Mon, 01 Jul 2013 15:59:41 +0100
Isaac Newton Institute
Balazs, A
8c7ab76ad59cfa0d7f8aca4f983fd7ec
aa6f1d7193112e0f77d051287a5824f1
b660be2876f070a78d2748fc4930439d
09dcc8e771a089883f67b34d154ce8a8
Balazs, A (University of Pittsburgh)
Thursday 27 June 2013, 14:4515:30
Balazs, A (University of Pittsburgh)
Thursday 27 June 2013, 14:4515:30
Cambridge University
2875
http://sms.cam.ac.uk/media/1509458
Reconfigurable assemblies of active, autochemotactic gels
Balazs, A (University of Pittsburgh)
Thursday 27 June 2013, 14:4515:30
Using computational modeling, we show that selfoscillating BelousovZhabotinsky (BZ) gels can both emit and sense a chemical signal and thus, drive neighboring gel pieces to spontaneously selfaggregate, so that the system exhibits autochemotaxis. To date, this is the closest system to the ultimate selfrecombining material, which can be divided into separated parts and the parts move autonomously to assemble into a structure resembling the original, uncut sample. We also show that the gels’ coordinated motion can be controlled by light, allowing us to achieve selective selfaggregation and control over the shape of the gel aggregates. By exposing the BZ gels to specific patterns of light and dark, we design a BZ gel “train” that leads the movement of its “cargo”. Our findings pave the way for creating reconfigurable materials from selfpropelled elements, which autonomously communicate with neighboring units and thereby actively participate in cons tructing the final structure. In essence, the BZ gels resemble pieces of a construction toy that can be reused to build multiple structures and thus, provide a new route for creating dynamically reconfigurable materials.
20130702T08:26:29+01:00
2875
1509458
true
16x9
false
no

Reconfigurable selfassembly through chiral control of interfacial tension
ucs_sms_1383776_1446119
http://sms.cam.ac.uk/media/1446119
Reconfigurable selfassembly through chiral control of interfacial tension
Gibaud, T (École Normale Supérieure)
Friday 22 March 2013, 16:2016:40
Mon, 25 Mar 2013 13:04:51 +0000
Isaac Newton Institute
Gibaud, T
fa3dd56368b37b48a72dd4952c7c7cf9
1871d8eaaf5c417c2b5485e919e668c1
f43437a34a77f8cf85ace44fef42a2b4
5845c320b836473c74f260f05561b920
Gibaud, T (École Normale Supérieure)
Friday 22 March 2013, 16:2016:40
Gibaud, T (École Normale Supérieure)
Friday 22 March 2013, 16:2016:40
Cambridge University
1314
http://sms.cam.ac.uk/media/1446119
Reconfigurable selfassembly through chiral control of interfacial tension
Gibaud, T (École Normale Supérieure)
Friday 22 March 2013, 16:2016:40
The interfacial tension between molecular species in selfassembling systems plays a crucial role in determining the physical properties of the mesoscopic assemblages. The predominant method for controlling interfacial tension is the addition of surfactant molecules, which preferentially adsorb onto the interface and modify the interactions between the two phases. Using a model colloidal membrane (Fig.1) composed of chiral, rodlike fdviruses, I will present a new method for controlling interfacial tension which does not require additional surfactant components, but instead utilizes the intrinsic chirality of the constituent rods. I will demonstrate that chirality can be used to continuously tune the interfacial tension of a membrane and to drive a dramatic phase transition from twodimensional membranes to onedimensional twisted ribbons. Using a wide variety of microscopic techniques, this transition is characterized over lengthscales, ranging from nanometers to microns. Finally, using optical forces we demonstrate that malleable chiral assemblages can easily be moved, stretched, attached to each other, and transformed between multiple polymorphic states, thus enabling precise assembly and sculpting of highly adaptable materials with complex topologies.
20130325T13:05:34+00:00
1314
1446119
true
16x9
false
no

Remarks about the Janossy effect
ucs_sms_1383776_1466273
http://sms.cam.ac.uk/media/1466273
Remarks about the Janossy effect
Kinderlehrer, D (Carnegie Mellon University)
Monday 08 April 2013, 10:0011:00
Mon, 22 Apr 2013 15:23:10 +0100
Isaac Newton Institute
Kinderlehrer, D
018eb3cf3aaec3e48edb41263cc18562
9ca72f1c84f5c6427dd430aa2367f9df
0ff6203dec346962d595fbab8c2e0522
47df1115956b949620fc3d9d536e23a1
Kinderlehrer, D (Carnegie Mellon University)
Monday 08 April 2013, 10:0011:00
Kinderlehrer, D (Carnegie Mellon University)
Monday 08 April 2013, 10:0011:00
Cambridge University
3660
http://sms.cam.ac.uk/media/1466273
Remarks about the Janossy effect
Kinderlehrer, D (Carnegie Mellon University)
Monday 08 April 2013, 10:0011:00
Light can change the orientation of a liquid crystal. This is the optical Freedericksz transition, discovered by Saupe. In the Janossy effect, the threshold intensity of the Freedericksz transition is dramatically resuced by the addition of a small amount of dye to the sample. We investigate the theory for this effect derived by E, Kosa, and PalffyMuhoray. Several themes come together, including molecular motors and MongeKantorovich mass transport. This is joint work with Michal Kowalczyk.
20130422T17:13:26+01:00
3660
1466273
true
4x3
false
no

Responsive Liquid Crystal Polymer Networks & Hydogels
ucs_sms_1383776_1517749
http://sms.cam.ac.uk/media/1517749
Responsive Liquid Crystal Polymer Networks & Hydogels
Broer, D (Eindhoven University of Technology)
Friday 28 June 2013, 14:0014:45
Fri, 12 Jul 2013 15:33:26 +0100
Isaac Newton Institute
Broer, D
1cbaaf56b8111e212f1a1fd8b54b9dcc
37a575348066ed5920e611674ede77a4
502f4a79325dfe2b5997f0ce52fbdb16
4aad5dcea57fc0eec39a03871cc70d82
Broer, D (Eindhoven University of Technology)
Friday 28 June 2013, 14:0014:45
Broer, D (Eindhoven University of Technology)
Friday 28 June 2013, 14:0014:45
Cambridge University
2829
http://sms.cam.ac.uk/media/1517749
Responsive Liquid Crystal Polymer Networks & Hydogels
Broer, D (Eindhoven University of Technology)
Friday 28 June 2013, 14:0014:45
Insitu photopolymerization of liquid crystalline (LC) monomers has proven to be a valuable technique for the formation of wellordered polymer networks. Their anisotropic properties led to a variety of applications in optics, electronics and mechanics. The use of light to initiate polymerization enables lithographic approaches for patterning. The LC behaviour enables formation of complex morphologies on molecular level. Controlling the director profile of an LC network film in transversal direction gives geometrical morphing upon minor changes in order parameter. Examples of suited profiles of molecular orientation are twisted or splayed director configurations tied up in the polymer network. Reversible order parameter changes can be induced by a variety of means. It can be simply induced by temperature changes resulting in gradients in thermal expansion over the crosssection of the film. But more sophisticated and of interest for applications is a light induced change as a result of the EZ isomerization of a builtin azo group. When the LC polymer networks are confined in the xy plane of the film, e.g. by strong adhesion to a high modulus substrate, deformation takes place into the third dimension forming surface topographies.
Rather than composing the netyworks of covalent bonds alone, one can chose to replace some bonds by secondary interactions such as hydrogen bridges, thus providing responsive molecularly organized hydrogels. We applied the Hbridge based dimerization of benzoic acid to form nematic LC acrylate monomers. By a controlled and reversible rupture of the Hbridges mechanical responses can be initiated. Photopolymerization of smectic LC monomers lock in structures of different length scales. The first length scale is the resolution of lithography, and goes down to a few micrometers. The second length scale is set by the spacing of smectic layers and is typically a few nanometers. The third length scale is the intermolecular distance in the layers, usually around 1 nm or below. By modifying smectic molecules with Hbridges the smectic periodicity can breakup into separated layers with a welldefined spacing, also in the nanometer range. The nanopores form by breaking the Hbridges at elevated temperatures or by contact with an alkaline solution. The integrity of the film is maintained by copolymerizing with fully covalent smectic crosslinkers. By making this crosslinker photosensitive the pore size can be regulated by UV light.
20130715T09:05:18+01:00
2829
1517749
true
16x9
false
no

Rice, Locusts and Chemical Waves: A Hydrodynamic Theory of Polar Active Smectics
ucs_sms_1383776_1508795
http://sms.cam.ac.uk/media/1508795
Rice, Locusts and Chemical Waves: A Hydrodynamic Theory of Polar Active Smectics
Toner, J (University of Oregon)
Tuesday 25 June 2013, 16:0016:45
Mon, 01 Jul 2013 08:51:21 +0100
Isaac Newton Institute
Toner, J
6ac7e6a78641edb2b47af2512464b07f
b85e7b8d64d70278a752709b74d114f6
48be1963af8fd21d870d90fa311c2b7e
53cccce9ba1ae3d5cbcea2572e400566
Toner, J (University of Oregon)
Tuesday 25 June 2013, 16:0016:45
Toner, J (University of Oregon)
Tuesday 25 June 2013, 16:0016:45
Cambridge University
3078
http://sms.cam.ac.uk/media/1508795
Rice, Locusts and Chemical Waves: A Hydrodynamic Theory of Polar Active Smectics
Toner, J (University of Oregon)
Tuesday 25 June 2013, 16:0016:45
We present a hydrodynamic theory of polar active smectics, by which we mean active striped systemsactive systems, both with and without number conservation. For the latter, we find quasi longranged smectic order in d=2 and longranged smectic order in d=3. In d=2 there is a KosterlitzThouless type phase transition from the smectic phase to the ordered fluid phase driven by increasing the noise strength. For the number conserving case, we find that giant number fluctuations are greatly suppressed by the smectic order; that smectic order is longranged in d=3; and that nonlinear effects become important in d=2.
20130701T13:14:52+01:00
3078
1508795
true
16x9
false
no

Rigidity, Zero Modes, States of Self Stress, and Surface Phonons in Periodic and Diluted Periodic Networks near their Instability Limit
ucs_sms_1383776_1505262
http://sms.cam.ac.uk/media/1505262
Rigidity, Zero Modes, States of Self Stress, and Surface Phonons in Periodic and Diluted Periodic Networks near their Instability Limit
Rothschild Visiting Professor Tom Lubensky (University of Pennsylvania)
Monday 24 June 2013, 16:0017:00
Tue, 25 Jun 2013 11:21:00 +0100
Isaac Newton Institute
Tom Lubensky
7ebe4d07497019a4ec444870dbc07b4e
eeaf88d3ae52aa22e7a1a3d10437fae9
1d3049f991b9aa36e2063d7ba0b3050d
b1610c33469c6b9b83f9f66733f4f9c5
Rothschild Visiting Professor Tom Lubensky (University of Pennsylvania)
Monday...
Rothschild Visiting Professor Tom Lubensky (University of Pennsylvania)
Monday 24 June 2013, 16:0017:00
Cambridge University
4260
http://sms.cam.ac.uk/media/1505262
Rigidity, Zero Modes, States of Self Stress, and Surface Phonons in Periodic and Diluted Periodic Networks near their Instability Limit
Rothschild Visiting Professor Tom Lubensky (University of Pennsylvania)
Monday 24 June 2013, 16:0017:00
Frames consisting of nodes connected pairwise by rigid rods or centralforce springs, possibly with preferred relative angles controlled by bending forces, are useful models for systems as diverse as architectural structures, crystalline and amorphous solids, sphere packings and granular matter, networks of semiflexible polymers, and protein structure. The rigidity of these networks depends on the average coordination number z of the nodes: If z is small enough, the frames have internal zerofrequency modes, and they are "floppy"; if z is large enough, they have no internal zero modes and they are rigid. The critical point separating these two regimes occurs at a rigidity threshold, which corresponds closely to what is often referred to as the isostatic point, that for central forces in ddimensions occurs at coordination number zc = 2d. At and near the rigidity threshold, elastic frames exhibit unique and interesting properties, including extreme sensitivity to boundary conditions, powerlaw scaling of elastic moduli with (z zc), and diverging length and time scales.
This talk will explore elastic and mechanical properties and mode structures of model periodic and diluted periodic lattices, such as the square and kagome lattices with centralforce springs, that are just on verge of mechanical instability, and 4coordinated lattices in two and three dimensions that are stabilized by bending forces. It will discuss the origin and nature of zero modes of these structures under both periodic (PBC) and free boundary conditions (FBC), and it will derive general conditions under which (a) the zero modes under the two boundary conditions are essentially identical and (b) under which zero modes do not appear in the periodic spectrum but do appear as surface Rayleigh waves in the free spectrum. In the former situation, lattices are generally in a type of critical state that admits states of selfstress in which there can be tension in bars with zero force on any node, and distortions away from that state give rise to surface modes under free boundary conditions whose degree of penetration into the bulk diverges at the critical state. This general phenomenon also occurs in subisostatic lattices like the honeycomb lattice. The talk will also explore diluted 4coordinated lattices as models for networks of semiflexible polymers, discuss the special properties that result when constituent polymers adopt strictly straight configurations.
20130626T13:10:57+01:00
4260
1505262
true
16x9
false
no

SAFT force fields for coarsegrained MD simulations
ucs_sms_1383776_1442551
http://sms.cam.ac.uk/media/1442551
SAFT force fields for coarsegrained MD simulations
Muller, EA (Imperial College London)
Tuesday 19 March 2013, 11:5012:40
Tue, 19 Mar 2013 15:29:04 +0000
Isaac Newton Institute
Muller, EA
86de225d41da57deb3558f32e9798dca
35c42b3e23d037e89c6b2615c5308e66
86c34954fbd55ab0752646a273a4e06c
69ac6992cab5179123bba64d8202d0c4
Muller, EA (Imperial College London)
Tuesday 19 March 2013, 11:5012:40
Muller, EA (Imperial College London)
Tuesday 19 March 2013, 11:5012:40
Cambridge University
2348
http://sms.cam.ac.uk/media/1442551
SAFT force fields for coarsegrained MD simulations
Muller, EA (Imperial College London)
Tuesday 19 March 2013, 11:5012:40
A dangerous overconfidence now prevails in the assumption that detailed allatom or unitedatom models which are used to represent the properties of fluid molecules (e.g. the OPLStype potentials) are sufficient to describe molecular systems with a precision that supplements experiments. More than 1% of all recent articles published in the open science and engineering community deal with molecular simulations at this level and in some cases the accuracy of the results is taken for granted. The fitting of parameter of the force fields is, however, still rather unsophisticated as compared to other aspects of computer modelling. Common practice is to hand fit a few parameters to a few experimental data points (e.g., a radial distribution function, solubility data and/or enthalpies at a given temperature or phase state). In this contribution we propose a new way of obtaining the required force field parameters. In our methodology one requires access to a physicalbased equation of state that describes the complete Helmholtz free energy in closed algebraic form, i.e., an equation of state (EoS) that is based on a defined intermolecular potential. Such an equation can then be used to explore a very large parameter space to estimate the locally optimal parameter set that provides an optimal description of the available macroscopical experimental data. This parameter set represents not just a unique fit to a single temperature or density, but rather an overarching average. If the equation of state is expressed in terms of the free energy of the system for a well defined intermolecular potential, it can be used to develop a “topdown averaged” intermolecular potential. Here we follow this line of thought and present a proofofconcept of such methodology, employing a recently developed EoS of the Statistical Associating Fluid Theory (SAFT) family using the socalled Mie intermolecular potential.
20130319T15:29:25+00:00
2348
1442551
true
16x9
false
no

Satisfaction of the eigenvalue constraints on the Qtensor
ucs_sms_1383776_1442176
http://sms.cam.ac.uk/media/1442176
Satisfaction of the eigenvalue constraints on the Qtensor
Ball, J (University of Oxford)
Monday 18 March 2013, 09:0009:50
Tue, 19 Mar 2013 09:53:53 +0000
Isaac Newton Institute
Ball, J
bcec39e6d3dbea18e74e26477a7bc11a
ee5ce0cd7014653929c77ebccd426985
cfbeb653224d84b609c70d8c03a24650
48135c815d256817486499124b2b4319
Ball, J (University of Oxford)
Monday 18 March 2013, 09:0009:50
Ball, J (University of Oxford)
Monday 18 March 2013, 09:0009:50
Cambridge University
3163
http://sms.cam.ac.uk/media/1442176
Satisfaction of the eigenvalue constraints on the Qtensor
Ball, J (University of Oxford)
Monday 18 March 2013, 09:0009:50
We discuss how Onsager theory with the MaierSaupe interaction leads naturally to a bulk free energy depending on the Qtensor that blows up as the minimum eigenvalue λmin(Q)→−1/3, using methods closely related to those of Katriel, Kventsel, Luckhurst and Sluckin (1986). With this bulk energy, and in the one constant approximation for the elastic energy, it is shown that for suitable boundary conditions, minimizers Q of the total free energy for a nematic liquid crystal filling a region Ω satisfy the physical requirement that infx∈Ωλmin(Q(x))>−1/3.
20130319T09:54:18+00:00
3163
1442176
true
16x9
false
no

Science Policy Forum
ucs_sms_1383776_1517033
http://sms.cam.ac.uk/media/1517033
Science Policy Forum
Huppert, J (Member of Parliament for Cambridge)
Friday 05 July 2013, 14:0015:15
Thu, 11 Jul 2013 13:30:29 +0100
Isaac Newton Institute
Huppert, J
56b32e4e02006071196239396bfbc15d
9b7c98d5bde1c919722e37c72ecc5973
88dbeb33d86405419a1358f3569ffba3
6aba0005f197605098b6ead14a097009
Huppert, J (Member of Parliament for Cambridge)
Friday 05 July 2013,...
Huppert, J (Member of Parliament for Cambridge)
Friday 05 July 2013, 14:0015:15
Cambridge University
3224
http://sms.cam.ac.uk/media/1517033
Science Policy Forum
Huppert, J (Member of Parliament for Cambridge)
Friday 05 July 2013, 14:0015:15
20130711T13:30:58+01:00
3224
1517033
true
16x9
false
no

Self assembly of fd viruses
ucs_sms_1383776_1502156
http://sms.cam.ac.uk/media/1502156
Self assembly of fd viruses
Pelcovits, B (Brown University Providence, Rhode Island)
Thursday 13 June 2013, 11:0012:00
Wed, 19 Jun 2013 16:15:45 +0100
Isaac Newton Institute
Pelcovits, B
c1dcce66d3c33d14e146ed8e6fb2810b
5fd95431d23da2272f800b454c467062
9bd38c29c5e88d6d8cc9ad190601575e
5a37fffbf96fa9aa20ce74c6d033a4a0
Pelcovits, B (Brown University Providence, Rhode Island)
Thursday 13 June...
Pelcovits, B (Brown University Providence, Rhode Island)
Thursday 13 June 2013, 11:0012:00
Cambridge University
4140
http://sms.cam.ac.uk/media/1502156
Self assembly of fd viruses
Pelcovits, B (Brown University Providence, Rhode Island)
Thursday 13 June 2013, 11:0012:00
Selfassembled SmecticA monolayers composed of chiral fd viruses in the presence of a polymer depletant have been shown by the Dogic group to exhibit a variety of novel structures as a function of temperature and polymer concentration. After reviewing some of the experimental findings I will discuss a phenomenological theoretical model of this system based on the Helfrich membrane energy and the de Gennes theory of smectics. I will show how this model can be used to understand some of the fascinating experimental observations of fd selfassembly.
20130619T16:16:16+01:00
4140
1502156
true
16x9
false
no

SelfAssembled NanoparticleLigand Optical Metasurfaces
ucs_sms_1383776_1516519
http://sms.cam.ac.uk/media/1516519
SelfAssembled NanoparticleLigand Optical Metasurfaces
Fontana, J (Naval Research Laboratory )
Friday 05 July 2013, 09:4510:00
Thu, 11 Jul 2013 08:41:29 +0100
Isaac Newton Institute
Fontana, J
e436e5933da2809cfc1cbb3145d6ec26
99c0bb25933bb594078470fd0f3bdffd
ce6aef09f3e5af3561d8931f88818df7
d90242be64b6a96dfaffcf1f29a78c1a
Fontana, J (Naval Research Laboratory )
Friday 05 July 2013, 09:4510:00
Fontana, J (Naval Research Laboratory )
Friday 05 July 2013, 09:4510:00
Cambridge University
765
http://sms.cam.ac.uk/media/1516519
SelfAssembled NanoparticleLigand Optical Metasurfaces
Fontana, J (Naval Research Laboratory )
Friday 05 July 2013, 09:4510:00
20130711T08:41:57+01:00
765
1516519
true
16x9
false
no

Selfassembly of liquid crystalline nanostructures in aqueous solution
ucs_sms_1383776_1445782
http://sms.cam.ac.uk/media/1445782
Selfassembly of liquid crystalline nanostructures in aqueous solution
Wilson, M (Durham University)
Friday 22 March 2013, 11:5012:40
Mon, 25 Mar 2013 09:59:12 +0000
Isaac Newton Institute
Wilson, M
0eef12212255fd2f1e90490fc0bf1cf0
4af26876a33815871b0c7e13344142d7
bec96c029ece90a76c7bbd7dbc5a8f00
a0f0bb946ea5c4e4e7ace80d1ea0d8e6
Wilson, M (Durham University)
Friday 22 March 2013, 11:5012:40
Wilson, M (Durham University)
Friday 22 March 2013, 11:5012:40
Cambridge University
2904
http://sms.cam.ac.uk/media/1445782
Selfassembly of liquid crystalline nanostructures in aqueous solution
Wilson, M (Durham University)
Friday 22 March 2013, 11:5012:40
Chromonic mesogens are nonconventional amphiphiles, which selfassemble in aqueous solution to form aggregate structures: rods, stacks or layers. At higher concentrations these aggregates can selforganise to form chromonic mesophases. Initial selfassembly is different to that seen in most conventional amphiphiles: it is enthalpicallydriven and takes place in the absence of a critical micelle concentration. Subsequent mesophase formation is driven by entropic factors.
There is great interest in chromonic systems as materials for the fabrication of new thin films for biosensors and optical compensators; and also because a better fundamental understanding of chromonic selfassembly is required to control aggregate structure formation in certain classes of drug molecules.
This talk presents results from molecular simulation studies of chromonic selfassembly at different levels of detail. Atomistic molecular dynamics simulations of the dye molecule, sunset yellow, and the drug molecule, disodium cromoglycate, determine for the first time the structure and dynamical properties of chromonic aggregates in aqueous solution. Showing how subtle changes in intermolecular interactions can change the mode of selfassembly. Coarsegrained models, at the level of dissipative particle dynamics (DPD), demonstrate how simulation provides a tool to engineer new nanostructures by exploring the role of molecular shape and interactions in determining the structure of aggregates formed.
20130325T09:59:40+00:00
2904
1445782
true
16x9
false
no

SelfAssembly of Two Dimensional Colloidal Alloys
ucs_sms_1383776_1446216
http://sms.cam.ac.uk/media/1446216
SelfAssembly of Two Dimensional Colloidal Alloys
Buzza, M (University of Hull)
Friday 22 March 2013, 16:4017:00
Mon, 25 Mar 2013 14:17:08 +0000
Isaac Newton Institute
Buzza, M
9d071165504ecc35b5f2b74c37286b57
06d9fce578db863a8087b0b64c5c4446
68ca4abcff32670ef410b640a3b3540f
45a15b472178623cd783d950be7478c4
Buzza, M (University of Hull)
Friday 22 March 2013, 16:4017:00
Buzza, M (University of Hull)
Friday 22 March 2013, 16:4017:00
Cambridge University
1334
http://sms.cam.ac.uk/media/1446216
SelfAssembly of Two Dimensional Colloidal Alloys
Buzza, M (University of Hull)
Friday 22 March 2013, 16:4017:00
We study the selfassembly of mixed monolayers of hydrophobic and hydrophilic colloidal particles adsorbed at oil/water interfaces both experimentally and theoretically. Experimentally, we find that by tuning the interactions, composition and packing geometry of the mixed monolayer, a rich variety of twodimensional superlattice and cluster structures are formed which are stabilised by strong electrostatic interactions mediated through the oil phase [1,2]. The 2D structures obtained are in excellent agreement with zero temperature lattice sum calculations, indicating that the selfassembly process can be effectively controlled [13]. Monte Carlo simulations further reveal that the melting behaviour of these superlattice structures proceeds via a multistage process, with melting temperatures that have a very strong and nonmonotonic dependence on composition [3].
[1] A.D. Law, D.M.A. Buzza, T.S. Horozov, Phys. Rev. Lett., 106, 128302 (2011) [2] A.D. Law, M. Auriol, D. Smith, T.S. Horozov, D.M.A. Buzza, submitted [2] A.D. Law, T.S. Horozov, D.M.A. Buzza, Soft Matter, 7, 8923 (2011)
20130325T14:17:38+00:00
1334
1446216
true
16x9
false
no

Simulation of armoured and swollen vesicles
ucs_sms_1383776_1446088
http://sms.cam.ac.uk/media/1446088
Simulation of armoured and swollen vesicles
Cheung, D (University of Warwick)
Friday 22 March 2013, 16:0016:20
Mon, 25 Mar 2013 12:50:45 +0000
Isaac Newton Institute
Cheung, D
98dcad2c94cf6ab321cb705af8e0a300
785767677bd2d69f26f74a613791d59d
c594c1240fc3ea15c4571674c0fc20e9
05ce11b67958676c32664c8f531c5519
Cheung, D (University of Warwick)
Friday 22 March 2013, 16:0016:20
Cheung, D (University of Warwick)
Friday 22 March 2013, 16:0016:20
Cambridge University
1146
http://sms.cam.ac.uk/media/1446088
Simulation of armoured and swollen vesicles
Cheung, D (University of Warwick)
Friday 22 March 2013, 16:0016:20
Polymer vesicles, fluid filled polymer sacs, have attracted much attention for applications such as drug delivery vehicles, miniature chemical reactors, or as synthetic, minimal cells. In these applications the vehicles may undergo significant changes in osmotic pressure, pH, or concentration, which may lead to vesicle rupture or collapse. In order to avoid this a number of possible strategies may be used to stabilise vesicles against changes in external environment. In this talk I will discuss some recent simulation work studying two of these  armouring and swelling.
Recently it has been shown that polymer vesicles may be coated with a layer of colloidal particles that armour these, in a similar manner to some biological systems. Simple Monte Carlo simulations were used to reproduce the packing patterns seen in these experimental systems and to study the effect of surface charge density on the selfassembly [1]. Dissipative particle dynamics simulations were used to study the swelling of a polymer bilayer when exposed to small hydrophobic molecules. Above a critical density of hydrophobic molecules the bilayer undergoes a morphological transition characterised by the formation of a bud within the bilayer, consistent with experimental observations of polymer vesicles [2].
[1] R Chen, DJG Pearce, S Fortuna, DL Cheung, and SAF Bon, J Am Chem Soc, 133, 2151 (2011) [2] CDJ Parmenter, R Chen, DL Cheung, and SAF Bon, Soft Matter, in press
20130325T12:51:08+00:00
1146
1446088
true
16x9
false
no

Simulations of bent core molecules using molecular dynamics
ucs_sms_1383776_1445849
http://sms.cam.ac.uk/media/1445849
Simulations of bent core molecules using molecular dynamics
Stokes, C (University of Manchester)
Friday 22 March 2013, 14:0014:20
Mon, 25 Mar 2013 10:13:41 +0000
Isaac Newton Institute
Stokes, C
5c03158301a9acd25ef5327df5a95577
7e19e18a2c4da0291ef0575cd22bc284
3d69babd4ccfc1b4633efe41a0e64c7c
48b11f877d78441f93fed2b788ed9a81
Stokes, C (University of Manchester)
Friday 22 March 2013, 14:0014:20
Stokes, C (University of Manchester)
Friday 22 March 2013, 14:0014:20
Cambridge University
1136
http://sms.cam.ac.uk/media/1445849
Simulations of bent core molecules using molecular dynamics
Stokes, C (University of Manchester)
Friday 22 March 2013, 14:0014:20
The nematic phase is normally uniaxial – i.e. there is just one distinct optical axis. In such a phase one set of molecular axes are aligned but the other axes are orientationally disordered. In 1970, however, Freiser showed that a biaxial nematic phase was theoretically possible, in which all three molecular axes are aligned. This phase has since been observed experimentally, predicted to exist theoretically for various particle models and has been seen in simulation studies. Such a phase would have three distinct optical axis and there are possible applications to liquid crystal displays, should a suitable material be found. In this talk I would like to present the results of simulation studies on purely repulsive bentcore models (Vshaped particles). In the limit of very long, thin arms, such shapes have been predicted to exhibit a biaxial nematic phase for bend angles in the region of 110o. In order to test these predictions and also to explore the system’s pha se behaviour at pressures at which the nematic phase is unstable, we have run molecular dynamics simulations for onecomponent systems, binary mixtures and higher order mixtures (4 – 6 components). In all case the runs started from the isotopic phase and the system, was then slowly compressed, so any phase observed had formed spontaneously. We explored the effects of varying the arm lengths and bend angles of these particles on the phase behaviour. For a onecomponent system, only particles with bend angles greater than ca. 130o spontaneously formed ordered, equilibrated phases. Typically the phase sequence was isotropic →uniaxial nematic→biaxial smectic A (except for very straight particles in which the smectic phase was uniaxial). No biaxial nematic phase was observed for the armlengths simulated. It is possible that if the smectic phase could be destabilized, a biaxial nematic might form in its place. Such destabilization might occur in mixtures. Binary mixtures of bent cores, however, were found.
20130325T12:16:41+00:00
1136
1445849
true
16x9
false
no

Simulations of model biaxial particles
ucs_sms_1383776_1443575
http://sms.cam.ac.uk/media/1443575
Simulations of model biaxial particles
Masters, A (University of Manchester)
Wednesday 20 March 2013, 09:5010:40
Thu, 21 Mar 2013 10:16:50 +0000
Isaac Newton Institute
Masters, A
2361355fc185c0d8c2d918572669207f
8a9aa76e8570ee44687fb04721dd62ad
6ab5032a110070fe71ee75f96ef9537d
18fb3295916a3eeef6fa5dec2bead928
Masters, A (University of Manchester)
Wednesday 20 March 2013, 09:5010:40
Masters, A (University of Manchester)
Wednesday 20 March 2013, 09:5010:40
Cambridge University
2206
http://sms.cam.ac.uk/media/1443575
Simulations of model biaxial particles
Masters, A (University of Manchester)
Wednesday 20 March 2013, 09:5010:40
The behaviour of axially symmetric particles has been wellinvestigated by both theory and computer simulation. Colloidal particles with such shapes have also been studied experimentally. For one component systems, nematic and smectic phases have been observed for rodlike particles, while discotic nematic and columnar phases have been noted for discs. If, however, one considers less symmetrical particles, then other phases become possible. Freiser (1970) showed theoretically that such a system might form a biaxial nematic phase, in which all particle axes are partially aligned, as opposed to a normal, uniaxial nematic where only one axis is ordered. Experimentally, a biaxial nematic phase has been reported for lyotropic systems (Yu & Saupe, 1980) and for suspensions of boardlike goethite particles (van den Pol et al., 2009). There also exist reports of thermotropic biaxial nematic phases, though debate still continues as to whether these really exist for these systems. I would like to present simulation results (and hopefully some simple theory) on two types of model particle which might show biaxial behaviour. The first model is of Vshaped particles (also called boomerangs, bananas and bentcores), while the second is closely related to the boardlike shapes of goethite mentioned above. In both cases the particles interact via repulsive interactions only. Both models have received previous theoretical and simulation attention, but hopefully a little extra investigation will not come amiss.
In both cases we used constant pressure, and sometimes constant stress, molecular dynamics simulations, compressing the system from an initial isotropic phase. For relatively straight Vshped particles, the simulations are straightforward and result in uniaxial nematic and biaxial smectic phases. For a bond angle of less than ca. 130 degrees, however, the system tends to jam on compression and equilibration becomes problematic. We therefore investigated mixtures of Vshapes to see whether mixing suppressed the smectic phases, giving room for a biaxial nematic phase to form. While, at least to date, this hope was not fulfilled, we still observed some effects that we believe are of interest.
The other system studied is of fused hexagons – a model related to hard boards. The phase behaviour observed here was rather rich. Depending on geometry we found rodlike, discotic and biaxial nematic phases. Rodlike particles formed both uniaxial and biaxial smectic A and C phases. Disclike particles formed not only columnar phases but also lamellar phases. Hopefully we will be able to rationalise the presence of at least some of these structures using simpleminded stability analysis.
20130321T10:17:16+00:00
2206
1443575
true
16x9
false
no

Soft active matter liquid crystalline order, rheology and oscillations
ucs_sms_1383776_1486345
http://sms.cam.ac.uk/media/1486345
Soft active matter liquid crystalline order, rheology and oscillations
Liverpool, TB (University of Bristol)
Thursday 16 May 2013, 12:0013:00
Thu, 23 May 2013 08:50:43 +0100
Isaac Newton Institute
Liverpool, TB
a24fbafa1152cc4f9a9ee4b7f1ca5b14
a0ed359a00305e1aad2d6f98187864d4
f8ab273444345e61a65967dd4f2345ea
c4d0d8bc3e6a4d397ac1242b1c927994
Liverpool, TB (University of Bristol)
Thursday 16 May 2013, 12:0013:00
Liverpool, TB (University of Bristol)
Thursday 16 May 2013, 12:0013:00
Cambridge University
4380
http://sms.cam.ac.uk/media/1486345
Soft active matter liquid crystalline order, rheology and oscillations
Liverpool, TB (University of Bristol)
Thursday 16 May 2013, 12:0013:00
20130523T08:51:08+01:00
4380
1486345
true
16x9
false
no

Soft Bend Elastic Constant and Transition to a Modulated Nematic Phase
ucs_sms_1383776_1427745
http://sms.cam.ac.uk/media/1427745
Soft Bend Elastic Constant and Transition to a Modulated Nematic Phase
Copic, M (Univerza v Ljubljani)
Thursday 21 February 2013, 11:0012:00
Thu, 28 Feb 2013 16:40:37 +0000
Isaac Newton Institute
Copic, M
dc56e1216e09c01ce02492ef082cd5a0
2c799bc08bf984142f1b4a56a7d7e98b
c8fc6178a8a2b08d3f27dddc0e5d9f3e
1a1aad8130b2a459b0c1281f61820b18
Copic, M (Univerza v Ljubljani)
Thursday 21 February 2013, 11:0012:00
Copic, M (Univerza v Ljubljani)
Thursday 21 February 2013, 11:0012:00
Cambridge University
3660
http://sms.cam.ac.uk/media/1427745
Soft Bend Elastic Constant and Transition to a Modulated Nematic Phase
Copic, M (Univerza v Ljubljani)
Thursday 21 February 2013, 11:0012:00
20130228T16:40:58+00:00
3660
1427745
true
16x9
false
no

Solid liquid crystals
ucs_sms_1383776_1387254
http://sms.cam.ac.uk/media/1387254
Solid liquid crystals
Warner, M (University of Cambridge)
Tuesday 08 January 2013, 14:0015:00
Tue, 15 Jan 2013 10:57:51 +0000
Isaac Newton Institute
Warner, M
8a30a66fda3dc384188cf0e76f7fd064
e15448c08b27ef19bf2d2e3a38806e20
0e3ec9abf77dbb717a28f7c563c99d35
88332b3afce4cb708356807f945ad5c1
eb94aeac13ba4105a4155486d29549f4
Warner, M (University of Cambridge)
Tuesday 08 January 2013, 14:0015:00
Warner, M (University of Cambridge)
Tuesday 08 January 2013, 14:0015:00
Cambridge University
3780
http://sms.cam.ac.uk/media/1387254
Solid liquid crystals
Warner, M (University of Cambridge)
Tuesday 08 January 2013, 14:0015:00
Liquid crystals can become solids when they form glasses or when liquid crystalline polymers are crosslinked to form rubber. They can show properties richer than solids and liquid crystals separately. Glasses have high moduli and their directors are not mobile with respect to the solid matrix. Rubber maintains the molecular mobility of a liquid; it can be deformed hugely, has a low modulus, and its director is mobile. Both can have their order reduced by heat, light and solvent, and then mechanically contract along the director by a few percent (glasses) and by 100s% (rubber). Topological defects in their director fields means that such mechanical response generates Gaussian curvature or topology changes.
Mobile directors respond to imposed strains by reapportioning natural length in directions required by distortions, rendering their energetic cost zero or very small. If necessary textures of such low cost deformations are required to comply with boundary conditions in much the same way as in Martensite. Indeed such techniques of quasiconvexification have been extended by DeSimone et al to complete and generalise the soft mechanics discovered theoretically and experimentally by physicists and chemists.
I shall sketch some of these phenomena and present recent results on the mechanical and topological effect of disclinations in nematic solids, and on how polydomain nematic solids can be supersoft.
20130115T10:58:11+00:00
3780
1387254
true
16x9
false
no

Some mathematical analysis of molecules in Ferroelectric Liquid Crystals
ucs_sms_1383776_1411086
http://sms.cam.ac.uk/media/1411086
Some mathematical analysis of molecules in Ferroelectric Liquid Crystals
Park, J (Chungnam National University)
Thursday 07 February 2013, 11:0012:00
Fri, 15 Feb 2013 11:52:56 +0000
Isaac Newton Institute
Park, J
c76448d9e9fa600ce38b37d267610b63
ce81294f5e7b73bc5c69eb9ce616e119
3ee2a6a2a70697fbc38cab7112a56a1d
41f38453b5c9bca549a1d12d3b5785ec
Park, J (Chungnam National University)
Thursday 07 February 2013, 11:0012:00
Park, J (Chungnam National University)
Thursday 07 February 2013, 11:0012:00
Cambridge University
3108
http://sms.cam.ac.uk/media/1411086
Some mathematical analysis of molecules in Ferroelectric Liquid Crystals
Park, J (Chungnam National University)
Thursday 07 February 2013, 11:0012:00
20130215T11:53:19+00:00
3108
1411086
true
16x9
false
no

Some recent results on analysis of nematic liquid crystal flows
ucs_sms_1383776_1469644
http://sms.cam.ac.uk/media/1469644
Some recent results on analysis of nematic liquid crystal flows
Wang, C (University of Kentucky)
Thursday 11 April 2013, 15:3016:30
Fri, 26 Apr 2013 12:52:03 +0100
Isaac Newton Institute
Wang, C
3adbac777e05308d75e82cd9c4152967
7c482b4b0dea968c9227a65384365859
5592ea4ace18d8c41b4c1bf303fc35c1
ad8628dcfd4b41eb4688ecfffe4691c8
Wang, C (University of Kentucky)
Thursday 11 April 2013, 15:3016:30
Wang, C (University of Kentucky)
Thursday 11 April 2013, 15:3016:30
Cambridge University
3371
http://sms.cam.ac.uk/media/1469644
Some recent results on analysis of nematic liquid crystal flows
Wang, C (University of Kentucky)
Thursday 11 April 2013, 15:3016:30
In this talk, I will survey some recent works on the analysis of a simplified version of EricksenLeslie equation modeling the hydrodynamic motions of nematic liquid crystals.
20130426T12:52:27+01:00
3371
1469644
true
4x3
false
no

Some results on the existence of solutions to the EricksenLeslie system
ucs_sms_1383776_1469590
http://sms.cam.ac.uk/media/1469590
Some results on the existence of solutions to the EricksenLeslie system
Hong, MC (University of Queensland)
Thursday 11 April 2013, 14:0015:00
Fri, 26 Apr 2013 12:46:56 +0100
Isaac Newton Institute
Hong, MC
a1187228cfe92aa80203ad0d4f6db12c
99968fadec1e314cbfb8bec5937c16e3
0ae92ab1efbfa72ec2ad3dc34f9b4deb
ea99b8bf40afa3beab9498a9232ad02d
Hong, MC (University of Queensland)
Thursday 11 April 2013, 14:0015:00
Hong, MC (University of Queensland)
Thursday 11 April 2013, 14:0015:00
Cambridge University
3211
http://sms.cam.ac.uk/media/1469590
Some results on the existence of solutions to the EricksenLeslie system
Hong, MC (University of Queensland)
Thursday 11 April 2013, 14:0015:00
The EricksenLeslie theory describes the dynamic flow of liquid crystals. In this talk, we will discuss global existence of solutions of the EricksenLeslie system for a general OseenFrank model in 2D. We also discuss some new results on the local existence, uniqueness and the blow up criterions of strong solutions to the EricksenLeslie system in 3D for the general OseenFrank model in 3D.
20130426T12:47:18+01:00
3211
1469590
true
4x3
false
no

Spontaneous flows and defect proliferation in active nematic liquid crystals
ucs_sms_1383776_1469406
http://sms.cam.ac.uk/media/1469406
Spontaneous flows and defect proliferation in active nematic liquid crystals
Marchetti, MC (Syracuse University)
Wednesday 10 April 2013, 10:0011:00
Fri, 26 Apr 2013 11:53:04 +0100
Isaac Newton Institute
Marchetti, MC
afad38fc410215e32496c9f533a3d5db
7247c5c5394b6dd5d550b2e5d98884d2
9ece2cf2517cf623c4d1d68d84ac30ec
a6fe4e0605cbfc8771283919bdc62b9e
Marchetti, MC (Syracuse University)
Wednesday 10 April 2013, 10:0011:00
Marchetti, MC (Syracuse University)
Wednesday 10 April 2013, 10:0011:00
Cambridge University
3900
http://sms.cam.ac.uk/media/1469406
Spontaneous flows and defect proliferation in active nematic liquid crystals
Marchetti, MC (Syracuse University)
Wednesday 10 April 2013, 10:0011:00
Active liquid crystals are nonequilibrium fluids composed of internally driven elongated units. Examples include mixtures of cytoskeletal filaments and associated motor proteins, bacterial suspensions, the cell cytoskeleton and even nonliving analogues, such as monolayers of vibrated granular rods. Due to the internal drive, these systems exhibit a host of nonequilibrium phenomena, including spontaneous laminar flow, large density fluctuations, unusual rheological properties, excitability, and low Reynolds number turbulence. In this talk I will review some of this phenomena and discuss new results on the dynamics and proliferation of topological defects in active liquid crystals. A simple analytical model for the defect dynamics will be shown to reproduce the key features of recent experiments in microtubulekinesin assemblies.
20130426T11:53:26+01:00
3900
1469406
true
4x3
false
no

Stabilization of liquid crystalline structures exhibiting topological defects
ucs_sms_1383776_1430242
http://sms.cam.ac.uk/media/1430242
Stabilization of liquid crystalline structures exhibiting topological defects
Kralj, S (University of Maribor)
Tuesday 12 February 2013, 14:0015:00
Mon, 04 Mar 2013 13:04:32 +0000
Isaac Newton Institute
Kralj, S
7ab9a511040fe86f614ff88e8141b9f7
20ba591ece5d85bca371d53f1b87fadd
8b2da2f9fca5d4b1e8c5aef83e31dafd
ee28d6409e5e91a4b218eaf4196ae1ca
Kralj, S (University of Maribor)
Tuesday 12 February 2013, 14:0015:00
Kralj, S (University of Maribor)
Tuesday 12 February 2013, 14:0015:00
Cambridge University
4560
http://sms.cam.ac.uk/media/1430242
Stabilization of liquid crystalline structures exhibiting topological defects
Kralj, S (University of Maribor)
Tuesday 12 February 2013, 14:0015:00
20130304T13:04:58+00:00
4560
1430242
true
4x3
false
no

Stretching of Polydomain and Monodomain Nematic Elastomers: Experimental Study
ucs_sms_1383776_1508962
http://sms.cam.ac.uk/media/1508962
Stretching of Polydomain and Monodomain Nematic Elastomers: Experimental Study
Urayama, K (Kyoto Institute of Technology)
Wednesday 26 June 2013, 14:4515:30
Mon, 01 Jul 2013 10:32:37 +0100
Isaac Newton Institute
Urayama, K
a31726075e24a2b0e2e7f22600e86609
f727dfe78bf3589b7562764c927e967d
3325ece422e333b2c53fd44c9abe48b4
284ed687630dc1aba0671fbb189640ab
Urayama, K (Kyoto Institute of Technology)
Wednesday 26 June 2013, 14:4515:30
Urayama, K (Kyoto Institute of Technology)
Wednesday 26 June 2013, 14:4515:30
Cambridge University
2868
http://sms.cam.ac.uk/media/1508962
Stretching of Polydomain and Monodomain Nematic Elastomers: Experimental Study
Urayama, K (Kyoto Institute of Technology)
Wednesday 26 June 2013, 14:4515:30
We review our experimental studies on the stretching driven directorrotation of polydomain nematic elastomers (PNEs) and monodomain NEs (MNEs). The texture of PNEs primarily depends on the preparation state, i.e., whether the crosslinks are introduced in the hightemperature isotropic or lowtemperature nematic state. The director in the isotropicgenesis PNEs can be rotated at unusually low energy cost by external fields. As a result, the isotropicgenesis PNEs can be largely deformed at small tensile force and moderate electric field strength. In contrast, the nematic genesis PNEs do not show such soft response due to the memory of the initial random director configuration. We observe the remanent of the initial director configuration even in the highly stretched state. The formation of stripe patterns has been known as a typical phenomenon of mechanical instability for the MNEs stretched normally to the initial global director. We introduce a different type of mechanical instability observed in our recent experiments for monodomain NEs.
20130701T13:30:06+01:00
2868
1508962
true
16x9
false
no

Structure and Dynamics of Anisotropic Soft Matter
ucs_sms_1383776_1444550
http://sms.cam.ac.uk/media/1444550
Structure and Dynamics of Anisotropic Soft Matter
Rey, A (McGill University)
Friday 22 March 2013, 09:0009:50
Fri, 22 Mar 2013 16:26:48 +0000
Isaac Newton Institute
Rey, A
97cdcd10a98f0b7642432c1627700fc5
f932959901ba126260ab56dc26da7a95
ab34e920cf54cec8c620e5b6dad5f939
b82706acdbd61bd7a2d2b618511f5072
Rey, A (McGill University)
Friday 22 March 2013, 09:0009:50
Rey, A (McGill University)
Friday 22 March 2013, 09:0009:50
Cambridge University
3190
http://sms.cam.ac.uk/media/1444550
Structure and Dynamics of Anisotropic Soft Matter
Rey, A (McGill University)
Friday 22 March 2013, 09:0009:50
This paper presents theory and modeling of structure and dynamics of three representative anisotropic soft matter materials :(i) confined nematics ; (ii) membranes and surfactantladen interfaces, and (iii) fiberfilled soft membranes, highlighting the interactions between geometry, order parameters, and material anisotropy. (i)Confined nematics are described using nematodynamics in the bulk, at surfaces and contact lines and used to analyze cholesteric collagen solutions under shear and in film casting processes and demonstrate how liquid crystalline polymer models are able to resolve experimentally observed flowalignment, banded textures, and free surface undulations. (ii) Membranes are described using membranodynamics, which extends the HelfrichBoussinesqScriven model by accounting for bending and torsion dissipation, and is used to establish direct connections between membrane shape and rheology. Lastly we describe (iii) fiberfilled membranes using the integration of nematodynamics and membranodynamics and apply the theory to plant cell walls, where the paranematic order of the cellulose semiflexible fibrils is coupled to the soft pectinbased membrane curvature, as reported experimentally.
20130322T16:27:11+00:00
3190
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Symmetry breaking and symmetry defects. Invariant theory applications
ucs_sms_1383776_1430074
http://sms.cam.ac.uk/media/1430074
Symmetry breaking and symmetry defects. Invariant theory applications
Zhilinskii, B (Université du Littoral Côte d'Opale)
Tuesday 19 February 2013, 14:0015:00
Mon, 04 Mar 2013 11:32:33 +0000
Isaac Newton Institute
Zhilinskii, B
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Zhilinskii, B (Université du Littoral Côte d'Opale)
Tuesday 19 February 2013,...
Zhilinskii, B (Université du Littoral Côte d'Opale)
Tuesday 19 February 2013, 14:0015:00
Cambridge University
4380
http://sms.cam.ac.uk/media/1430074
Symmetry breaking and symmetry defects. Invariant theory applications
Zhilinskii, B (Université du Littoral Côte d'Opale)
Tuesday 19 February 2013, 14:0015:00
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