3
The mathematical design of new materials
http://sms.cam.ac.uk/collection/2901231
Programme
3rd January 2019 to 28th June 2019
Organisers:
Arghir Zarnescu BCAM  Basque Center for Applied Mathematics, Institute of Mathematics of the Romanian Academy
Xian Chen Hong Kong University of Science and Technology
Miha Ravnik University of Ljubljana, Jozef Stefan Institute
Valeriy Slastikov University of Bristol
Above image: "Martensitic Material", an experiment of Tomonari Inamura's group.
Many recent and spectacular advances in the world of materials are related to complex materials having extraordinary and unique features, usually determined by their specific microstructure. Such materials are key to much technology appearing in our daily lives: they are in liquid crystal displays, in miniaturised phones, special steels in cars, plastics and composites in the construction of modern airplanes, in biological implants in human bodies, and so on.
However, despite the impressive technological applications of these materials, the theoretical understanding and modelling of them are still inadequate.The need for models and basic understanding is not just of theoretical interest, but indeed a key requirement for being able to access and further develop the true potential of these materials, to optimise them, to combine them into new materials, and to use them for creating new devices, with predefined abilities and behaviours.
The current programme aims to bring together mathematicians and scientists working in various areas of materials science and applied mathematics in order to initiate a systematic study of the optimal design of new complex materials, focusing on:
1. Topological metamaterials
2. Colloid composites
3. Composite alloys
4. Layered heterostructures
5. Woven or printed materials
6. Structural optimisation
as the distinct existing attempts from engineering, physics and chemistry. Building on the mathematical areas that are directly relevant to the scientific questions of interest, namely, optimisation and calculus of variations, geometry and topology, continuum mechanics and partial differential equations, the programme aims to identify and study the common principles and techniques of optimal material design that apply more broadly.
1440
2019
Wed, 26 Jun 2019 14:28:56 +0100
Mon, 14 Jan 2019 09:21:05 +0000
en
smssupport@uis.cam.ac.uk
The mathematical design of new materials
http://sms.cam.ac.uk/collection/2901231
http://rss.sms.cam.ac.uk/itunesimage/2901308.jpg
http://video.search.yahoo.com/mrss
The mathematical design of new materials
Programme
3rd January 2019 to 28th June 2019
Organisers:
Arghir Zarnescu BCAM  Basque Center for Applied Mathematics, Institute of Mathematics of the Romanian Academy
Xian Chen Hong Kong University of Science and Technology
Miha Ravnik University of Ljubljana, Jozef Stefan Institute
Valeriy Slastikov University of Bristol
Above image: "Martensitic Material", an experiment of Tomonari Inamura's group.
Many recent and spectacular advances in the world of materials are related to complex materials having extraordinary and unique features, usually determined by their specific microstructure. Such materials are key to much technology appearing in our daily lives: they are in liquid crystal displays, in miniaturised phones, special steels in cars, plastics and composites in the construction of modern airplanes, in biological implants in human bodies, and so on.
However, despite the impressive technological applications of these materials, the theoretical understanding and modelling of them are still inadequate.The need for models and basic understanding is not just of theoretical interest, but indeed a key requirement for being able to access and further develop the true potential of these materials, to optimise them, to combine them into new materials, and to use them for creating new devices, with predefined abilities and behaviours.
The current programme aims to bring together mathematicians and scientists working in various areas of materials science and applied mathematics in order to initiate a systematic study of the optimal design of new complex materials, focusing on:
1. Topological metamaterials
2. Colloid composites
3. Composite alloys
4. Layered heterostructures
5. Woven or printed materials
6. Structural optimisation
as the distinct existing attempts from engineering, physics and chemistry. Building on the mathematical areas that are directly relevant to the scientific questions of interest, namely, optimisation and calculus of variations, geometry and topology, continuum mechanics and partial differential equations, the programme aims to identify and study the common principles and techniques of optimal material design that apply more broadly.
The mathematical design of new materials
Programme
3rd January 2019 to 28th June 2019
Organisers:
Arghir Zarnescu BCAM  Basque Center for Applied Mathematics, Institute of Mathematics of the Romanian Academy
Xian Chen Hong Kong University of Science and Technology
Miha Ravnik University of Ljubljana, Jozef Stefan Institute
Valeriy Slastikov University of Bristol
Above image: "Martensitic Material", an experiment of Tomonari Inamura's group.
Many recent and spectacular advances in the world of materials are related to complex materials having extraordinary and unique features, usually determined by their specific microstructure. Such materials are key to much technology appearing in our daily lives: they are in liquid crystal displays, in miniaturised phones, special steels in cars, plastics and composites in the construction of modern airplanes, in biological implants in human bodies, and so on.
However, despite the impressive technological applications of these materials, the theoretical understanding and modelling of them are still inadequate.The need for models and basic understanding is not just of theoretical interest, but indeed a key requirement for being able to access and further develop the true potential of these materials, to optimise them, to combine them into new materials, and to use them for creating new devices, with predefined abilities and behaviours.
The current programme aims to bring together mathematicians and scientists working in various areas of materials science and applied mathematics in order to initiate a systematic study of the optimal design of new complex materials, focusing on:
1. Topological metamaterials
2. Colloid composites
3. Composite alloys
4. Layered heterostructures
5. Woven or printed materials
6. Structural optimisation
as the distinct existing attempts from engineering, physics and chemistry. Building on the mathematical areas that are directly relevant to the scientific questions of interest, namely, optimisation and calculus of variations, geometry and topology, continuum mechanics and partial differential equations, the programme aims to identify and study the common principles and techniques of optimal material design that apply more broadly.
Cambridge University
Arnel Hernandez
ah984@cam.ac.uk
http://sms.cam.ac.uk/collection/2901231
The mathematical design of new materials
20190114T09:21:05+00:00
INIMS
002281
no

Collective coordinates, asymptotics and domain wall dynamics in ferromagnets
ucs_sms_2901231_2914864
http://sms.cam.ac.uk/media/2914864
Collective coordinates, asymptotics and domain wall dynamics in ferromagnets
Robbins, J
Wednesday 30th January 2019  17:00 to 18:00
Tue, 05 Feb 2019 09:56:46 +0000
Isaac Newton Institute
Robbins, J
42b3c5ec4313cfa666ff6d3da06fae89
b6d97fe1e9521bcf344d1b7da35022c0
0ef117be5bdedd074ec9d57539dfd06a
79119f2674993a0c45ce9ba5ee5f1da4
Robbins, J
Wednesday 30th January 2019  17:00 to 18:00
Robbins, J
Wednesday 30th January 2019  17:00 to 18:00
Cambridge University
3092
http://sms.cam.ac.uk/media/2914864
Collective coordinates, asymptotics and domain wall dynamics in ferromagnets
Robbins, J
Wednesday 30th January 2019  17:00 to 18:00
The method of collective coordinates is a simple and widely used variational procedure for finding approximate solutions to many or infinitedimensional, possibly damped and driven, Hamiltonian systems. The approximate solutions are typically characterised by a small number of timedependent parameters, which are understood to describe a small number of activated modes. The simplicity of the method comes at a price, however, as it does not allow a determination of how good (or bad) the approximation is. In certain regimes, asymptotic expansions can provide the requisite estimates, though they require more work. This is illustrated for the problem of the motion of domain walls in ferromagnets. Domain walls are interfaces between differently oriented magnetic domains, and the dynamics of these interfaces under applied magnetic fields and currents is a problem of current physical and technological interest. We also describe behaviour in a highfield regime, beyond the wellknown Walker breakdown, where one of the domains becomes unstable. A new type of dynamics emerges that appears to be beyond the reach of a collective coordinate description. It can be described using front propagation theory, but rigorous results (akin to a KPP analysis) appear to be challenging. This is joint work with Arseni Goussev, Valeriy Slastikov, and Sergiy Vasylkevych.
20190205T09:56:46+00:00
3092
2914864
true
16x9
false
no

Explicit integral representations of the relaxation of nonlocal energies for structured deformations
ucs_sms_2901231_3009062
http://sms.cam.ac.uk/media/3009062
Explicit integral representations of the relaxation of nonlocal energies for structured deformations
Matias, J
Wednesday 19th June 2019  15:10 to 15:50
Wed, 26 Jun 2019 14:28:56 +0100
Isaac Newton Institute
Matias, J
b25f63d240584834405cc5ab0b998c58
c7ba09b2cc1e506bd9adade616f4518c
1997bf96953baef261d986dfc4ad1ed4
0e2f88d0a3be345dc06c3b25ce5a822a
Matias, J
Wednesday 19th June 2019  15:10 to 15:50
Matias, J
Wednesday 19th June 2019  15:10 to 15:50
Cambridge University
2555
http://sms.cam.ac.uk/media/3009062
Explicit integral representations of the relaxation of nonlocal energies for structured deformations
Matias, J
Wednesday 19th June 2019  15:10 to 15:50
The theory of structured deformations in the SBV setting developed by Chocki & Fonseca [1]
only takes into account the linear dependance on jumps along the approximating sequences. Following a
model from Del Piero & Owen [2] that captures the nonlinear dependence on jumps, the present approach
to relaxation of nonlocal energies rests on two limiting processes: start from a submacroscopical level
where we have a weighted average of disarrangements within neighborhoods of fixed size r > 0 and pass to
the macrolevel, permitting disarrangements to diffuse through such a neighborhood. This limiting process
determines a structured deformation as well as the nonlocal dependence of the energy density of such a
structured deformation. Pass to the limit as r ! 0, to obtain purely local bulk and interfacial energy
densities for the structured deformation identified in the first step.
This is a joint work with
Marco Morandotti, Dipartimento di Scienze Matematiche “G. L. Lagrange”, Politecnico di Torino,
David R. Owen, Department of Mathematical Sciences, Carnegie Mellon University,
Elvira Zappale, Dipartimento di Ingegneria Industriale, Università degli Studi di Salerno.
References
[1] R. Choksi and I. Fonseca: Bulk and interfacial energy densities for structured deformations of continua. Arch. Rational
Mech. Anal. 138 (1997), 37103.
[2] G. Del Piero and D. R. Owen: Structured Deformations: Part Two. Quaderni
20190626T14:28:56+01:00
2555
3009062
true
16x9
false
no

Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  4
ucs_sms_2901231_2947387
http://sms.cam.ac.uk/media/2947387
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  4
Luskin, M
Wednesday 27th March 2019  09:00 to 10:00
Wed, 27 Mar 2019 14:54:53 +0000
Isaac Newton Institute
Luskin, M
bc91a4cdd5d5c4e673d98fd96a3252d0
e0955fde61a4d020bf740332c847809f
2fc24394cc986b581f1e7a24bbdccf71
0a805dacd47cb8d4941f060d205fdef5
Luskin, M
Wednesday 27th March 2019  09:00 to 10:00
Luskin, M
Wednesday 27th March 2019  09:00 to 10:00
Cambridge University
3472
http://sms.cam.ac.uk/media/2947387
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  4
Luskin, M
Wednesday 27th March 2019  09:00 to 10:00
20190327T14:54:53+00:00
3472
2947387
true
16x9
false
no

A homogenization result in the gradient theory of phase transitions
ucs_sms_2901231_2967507
http://sms.cam.ac.uk/media/2967507
A homogenization result in the gradient theory of phase transitions
Fonseca, I
Wednesday 17th April 2019  15:30 to 16:30
Wed, 24 Apr 2019 16:29:06 +0100
Isaac Newton Institute
Fonseca, I
c36cf63bb14cce3d981e853a2d8eb9c9
9fe5dfa51e71b99a3cfc1e3e6bf6f1f2
055464f4a00bc2c07a00e0ce3be7cdaa
481d22b15c2efa99c5880ca0e801b13c
Fonseca, I
Wednesday 17th April 2019  15:30 to 16:30
Fonseca, I
Wednesday 17th April 2019  15:30 to 16:30
Cambridge University
3600
http://sms.cam.ac.uk/media/2967507
A homogenization result in the gradient theory of phase transitions
Fonseca, I
Wednesday 17th April 2019  15:30 to 16:30
A variational model in the context of the gradient theory for fluidfluid phase transitions with small scale heterogeneities is studied. In particular, the case where the scale ε of the small homogeneities is of the same order of the scale governing the phase transition is considered. Here the interaction between homogenization and the phase transitions process will lead, in the limit as ε→0, to an anisotropic interfacial energy.
20190424T16:29:06+01:00
3600
2967507
true
16x9
false
no

A moving mask hypothesis to select physically relevant microstructures
ucs_sms_2901231_2902449
http://sms.cam.ac.uk/media/2902449
A moving mask hypothesis to select physically relevant microstructures
Della Porta, F
Tuesday 15th January 2019  09:45 to 10:30
Wed, 16 Jan 2019 14:39:59 +0000
Isaac Newton Institute
Della Porta, F
f4e7674f1c1398fe510a81c13f8ff74b
a6c13f1818296fdcb35a394fd77ab1df
5c0069ef753869a8adf041842ab4da02
69aced5578170f458102c3a8591ec051
Della Porta, F
Tuesday 15th January 2019  09:45 to 10:30
Della Porta, F
Tuesday 15th January 2019  09:45 to 10:30
Cambridge University
2324
http://sms.cam.ac.uk/media/2902449
A moving mask hypothesis to select physically relevant microstructures
Della Porta, F
Tuesday 15th January 2019  09:45 to 10:30
In this talk I present a moving mask hypotheses that can be used as a selection mechanism for physically relevant microstructures in thermally induced martensitic phase transitions. The moving mask hypotheses allows to better understand the importance of the cofactor conditions, particular conditions of supercompatibility between phases, which are believed to influence reversibility.
20190116T14:39:59+00:00
2324
2902449
true
16x9
false
no

A touch of nonlinearity: mesoscale swimmers and active matter in fluids
ucs_sms_2901231_2985330
http://sms.cam.ac.uk/media/2985330
A touch of nonlinearity: mesoscale swimmers and active matter in fluids
Klotsa, D
Wednesday 15th May 2019  09:40 to 10:20
Thu, 16 May 2019 13:09:11 +0100
Isaac Newton Institute
Klotsa, D
52bc83139bcb07550467480612af647d
8c92e2fd7664ab4dd30bd210aa0a0f46
d38dd32dbb88070888023dc513990eb5
68df89370f53e050e475903324fb3c38
Klotsa, D
Wednesday 15th May 2019  09:40 to 10:20
Klotsa, D
Wednesday 15th May 2019  09:40 to 10:20
Cambridge University
2441
http://sms.cam.ac.uk/media/2985330
A touch of nonlinearity: mesoscale swimmers and active matter in fluids
Klotsa, D
Wednesday 15th May 2019  09:40 to 10:20
Living matter, such as biological tissue, can be seen as a nonequilibrium hierarchical assembly of assemblies of smaller and smaller active components, where energy is consumed at many scales. The functionality and versatility of such living or “activematter” systems render it a promising candidate in a discussion on the optimal design of soft matter. While many activematter systems reside in fluids (solution, blood, ocean, air), so far, studies that include hydrodynamic interactions have focussed on microscopic scales in Stokes flows, where the active particles are <100μm and the Reynolds number, Re <<1. At those microscopic scales viscosity dominates and inertia can be neglected. However, what happens as swimmers slightly increase in size (say ~0.1mm100cm) or as they form larger aggregates and swarms? The system then enters the intermediate Reynolds regime where both inertia and viscosity play a role, and where nonlinearities in the fluid are introduced. In this talk, I will present a simple model swimmer used to understand the transition from Stokes to intermediate Reynolds numbers, first for a single swimmer, then for pairwise interactions and finally for collective behavior. We show that, even for a simple model, inertia can induce hydrodynamic interactions that generate novel phase behavior, steady states and transitions.
20190516T13:09:11+01:00
2441
2985330
true
16x9
false
no

Active and architectured sheets: From nematic elastomers to rigidlyfoldable origami
ucs_sms_2901231_2958925
http://sms.cam.ac.uk/media/2958925
Active and architectured sheets: From nematic elastomers to rigidlyfoldable origami
Plucinsky, P
14 March 2019
16.0017.00
Fri, 12 Apr 2019 12:44:35 +0100
Isaac Newton Institute
Plucinsky, P
8d84888713834281bdcfff956b803704
1166975321057329268c15459356d4b9
ac0f5c4fd25247daf6622c1c61a11a5c
b4e26bcf218088ffb770dbba7bd97fb5
Plucinsky, P
14 March 2019
16.0017.00
Plucinsky, P
14 March 2019
16.0017.00
Cambridge University
3370
http://sms.cam.ac.uk/media/2958925
Active and architectured sheets: From nematic elastomers to rigidlyfoldable origami
Plucinsky, P
14 March 2019
16.0017.00
20190412T12:44:35+01:00
3370
2958925
true
16x9
false
no

Advances in interatomic potentials for metals and alloys
ucs_sms_2901231_2958816
http://sms.cam.ac.uk/media/2958816
Advances in interatomic potentials for metals and alloys
Csányi, G
13 March 2019
11.0012.00
Fri, 12 Apr 2019 12:33:47 +0100
Isaac Newton Institute
Csányi, G
609a003e6c9ea6bbc3edc64dc0ff6000
7b1ab6a47a904eb36724154a0e7fb4be
c0d1d44d89ff61e6740d86036224f8be
34628269aa31af2d57c364234e968efc
Csányi, G
13 March 2019
11.0012.00
Csányi, G
13 March 2019
11.0012.00
Cambridge University
3496
http://sms.cam.ac.uk/media/2958816
Advances in interatomic potentials for metals and alloys
Csányi, G
13 March 2019
11.0012.00
20190412T12:33:47+01:00
3496
2958816
true
16x9
false
no

Asymptotics of Landaude Gennes theory
ucs_sms_2901231_2901890
http://sms.cam.ac.uk/media/2901890
Asymptotics of Landaude Gennes theory
Robbins, J
Monday 14th January 2019  11:00 to 11:45
Tue, 15 Jan 2019 13:44:00 +0000
Isaac Newton Institute
Robbins, J
ddd90583b3376db12bb3fd937a248a27
a69a6c74f151f4bb49e1c80392e9732c
427079b00b00ca8ec530ea5806163d87
fd3223448dfae9ad0006c348af0927b3
Robbins, J
Monday 14th January 2019  11:00 to 11:45
Robbins, J
Monday 14th January 2019  11:00 to 11:45
Cambridge University
2654
http://sms.cam.ac.uk/media/2901890
Asymptotics of Landaude Gennes theory
Robbins, J
Monday 14th January 2019  11:00 to 11:45
We consider the Landaude Gennes model for nematic liquid crystals in a twodimensional domain subject to integerdegree boundary conditions, consistent with the absence of defects, in the physically relevant regime of weak elasticity. At leading order, the minimumenergy configuration is described by the simpler OseenFrank theory. We obtain the nextorder corrections using a Gammaconvergence approach. These turn out to be determined by an algebraic rather than a differential equation. The most important qualitative feature is the appearance of biaxiality, with strength and orientation determined by the gradient of the Frank director. The results are applied to the variational problem in which only the degree of the boundary conditions is fixed. In contrast to an analogous and wellknown problem in the GinzburgLandau model of vortices, it is found that the energy is only partially degenerate at leading order, with a family of conformal boundary conditions, parameterised by the positions of escape points (the analogues of vortices), achieving the minimum possible energy. This partial degeneracy is lifted at the next order. This is joint work with G di Fratta, V Slastikov and A Zarnescu.
20190115T13:44:00+00:00
2654
2901890
true
16x9
false
no

Attractive and Repulse Interactions in Dense Nematics
ucs_sms_2901231_2901864
http://sms.cam.ac.uk/media/2901864
Attractive and Repulse Interactions in Dense Nematics
PalffyMuhoray, P
Monday 14th January 2019  09:45 to 10:30
Tue, 15 Jan 2019 13:40:14 +0000
Isaac Newton Institute
PalffyMuhoray, P
396c6f4293544260c241d0a5151e68fe
54a5e6c1c32bc4fbad3008de403af177
3fba96c07d9aabd8d873596709aec953
251ba41608a58b7a0ed2c3f4e2da98ed
PalffyMuhoray, P
Monday 14th January 2019  09:45 to 10:30
PalffyMuhoray, P
Monday 14th January 2019  09:45 to 10:30
Cambridge University
2190
http://sms.cam.ac.uk/media/2901864
Attractive and Repulse Interactions in Dense Nematics
PalffyMuhoray, P
Monday 14th January 2019  09:45 to 10:30
20190115T13:40:14+00:00
2190
2901864
true
16x9
false
no

Building and optimising finitetime adiabatic processes in stochastic thermodynamics
ucs_sms_2901231_2986248
http://sms.cam.ac.uk/media/2986248
Building and optimising finitetime adiabatic processes in stochastic thermodynamics
Prados, A
Friday 17th May 2019  11:50 to 12:10
Fri, 17 May 2019 15:17:38 +0100
Isaac Newton Institute
Prados, A
c784bdd1e6c7e5f2a582f58fb4a0c24a
f0f554489f527169212718cc7e276e5a
60ea0a4bf91c88158484b1b158545956
748bca0412c79e6cfba013ba7870c4c8
Prados, A
Friday 17th May 2019  11:50 to 12:10
Prados, A
Friday 17th May 2019  11:50 to 12:10
Cambridge University
1250
http://sms.cam.ac.uk/media/2986248
Building and optimising finitetime adiabatic processes in stochastic thermodynamics
Prados, A
Friday 17th May 2019  11:50 to 12:10
In this talk, we address the building of finitetime adiabatic processes at the mesoscale, i.e. processes in which the average heat exchange between the system and its surroundings vanishes. Specifically, we consider a Brownian particle trapped by a harmonic potential and immersed in a fluid. Therein, we analyse some general properties and, in particular, we show that there emerges a minimum time for connecting two equilibrium states with such a finitetime adiabatic process. Also, we look into a different optimisation problem, namely that of the final temperature for a given connection time. Interestingly, we find out that this second problem is closely related to the first one: both of them are controlled by the same function. Finally, we discuss some perspectives for future work. (In collaboration with Carlos A. Plata, David GuéryOdelin and Emmanuel Trizac)
20190517T15:17:38+01:00
1250
2986248
true
16x9
false
no

Charging of neutral solutes in water
ucs_sms_2901231_2986241
http://sms.cam.ac.uk/media/2986241
Charging of neutral solutes in water
Bonthuis, D
Friday 17th May 2019  11:10 to 11:50
Fri, 17 May 2019 15:19:58 +0100
Isaac Newton Institute
Bonthuis, D
f16befe6787d6671878a4a321c6f67dc
511cd42a5128516b221d5ec5f26bb151
add7ad1c1de77bb779f473e7759e4cb4
e9b432624cd836e815ae2ed175f1a240
Bonthuis, D
Friday 17th May 2019  11:10 to 11:50
Bonthuis, D
Friday 17th May 2019  11:10 to 11:50
Cambridge University
2571
http://sms.cam.ac.uk/media/2986241
Charging of neutral solutes in water
Bonthuis, D
Friday 17th May 2019  11:10 to 11:50
Owing to the small length scales involved, aqueous interfaces dominate the properties of colloidal materials suspended in water. Surface charges, in particular, control the stability of colloidal suspensions and the selfassembly and organization of nanoparticles. Apart from charging by surface groups, ions and protons adsorb at the surfaces of colloids, lipid membranes and biological molecules, affecting their electrostatic and hydrodynamic interactions. We study the interfacial structure of the aqueous interfaces of oil droplets, air bubbles and solid surfaces. A combination of analytical work, molecular dynamics simulations and continuum theory allows for direct comparison to experimental results for surface tensions, conductivities and electrokinetic mobilities.
20190517T15:19:58+01:00
2571
2986241
true
16x9
false
no

Construction of two dimensional convex shapes from their excluded volumes
ucs_sms_2901231_2901912
http://sms.cam.ac.uk/media/2901912
Construction of two dimensional convex shapes from their excluded volumes
Taylor, J
Monday 14th January 2019  15:15 to 16:00
Tue, 15 Jan 2019 13:51:30 +0000
Isaac Newton Institute
Taylor, J
037a47ab2c3c3622af126b73ae387c79
32086a96fe94027dfcae7b3f3b1d5c9a
1ceacd341c8570f216415351a1a3bc34
e471b3e282e8969d26a66a6ccf00d65d
Taylor, J
Monday 14th January 2019  15:15 to 16:00
Taylor, J
Monday 14th January 2019  15:15 to 16:00
Cambridge University
2368
http://sms.cam.ac.uk/media/2901912
Construction of two dimensional convex shapes from their excluded volumes
Taylor, J
Monday 14th January 2019  15:15 to 16:00
In a dilute system of spatially homogeneous system of hard, nonspherical, particles, Onsager tells us that all phase behaviour can (in principle) be derived by explained by understanding how much volume is excluded to one particle by the presence of another, given their relative orientations. In this talk, we will consider the case of two dimensional convex bodies, and describe forward and inverse problems related to evaluating their socalled excluded volume function, which depends entirely on the particle shape. In particular, we propose and analyse an algorithm which can reconstruct a convex body from an excluded volume function, although such solutions can be shown generally to be nonunique. While only providing results in the simpler twodimensional setting, these results pave the way for design of particle shape based on desired phase behaviour properties.
20190115T13:51:30+00:00
2368
2901912
true
16x9
false
no

Contact Topology and the Cholesteric Landscape
ucs_sms_2901231_2984079
http://sms.cam.ac.uk/media/2984079
Contact Topology and the Cholesteric Landscape
Machon, T
Monday 13th May 2019  10:20 to 10:40
Tue, 14 May 2019 13:12:46 +0100
Isaac Newton Institute
Machon, T
f4f4f847bd396efbbe395203e5a223e4
1991c60c87a3892de3e63ecb4c4dc91c
3405ee11846ba1d74605f439d3580991
420ae5a686f646b22c74e5065f5656e6
Machon, T
Monday 13th May 2019  10:20 to 10:40
Machon, T
Monday 13th May 2019  10:20 to 10:40
Cambridge University
1238
http://sms.cam.ac.uk/media/2984079
Contact Topology and the Cholesteric Landscape
Machon, T
Monday 13th May 2019  10:20 to 10:40
Cholesterics, chiral liquid crystals, typically exhibit a large number of metastable states for a given geometry. This is both a blessing and a curse, it affords great potential for the creation of new devices but can also mean that tight control of a structure can be difficult to achieve. In this talk we will discuss why it is that the tendency of cholesterics to twist means that they have a complex energy landscape. Our principle tools will be drawn from the field of contact topology. By describing cholesterics as contact structures we will show that nonvanishing twist implies conservation of the layer structure in cholesteric liquid crystals. This characterises the morphological richness of these systems, leads to a number of additional topological invariants for cholesteric textures that are not captured by traditional descriptions, and gives a geometric characterisation of cholesteric dynamics in any context, including active systems, those in confined geometries or under the influence of an external field.
20190514T13:12:46+01:00
1238
2984079
true
16x9
false
no

Datadriven approach for indexingfree Xray crystallography
ucs_sms_2901231_2958801
http://sms.cam.ac.uk/media/2958801
Datadriven approach for indexingfree Xray crystallography
Chen, X
13 March 2019
09.3010.30
Fri, 12 Apr 2019 12:32:20 +0100
Isaac Newton Institute
Chen, X
ae58be58b07238c5fa5a6ca3b1c36654
824ba7f29b5ee38e9445595cafd81aa0
43f285e3fb74a77411aac50394ba15bf
4be8d2e12b4422a759d470a0dee1fb4e
Chen, X
13 March 2019
09.3010.30
Chen, X
13 March 2019
09.3010.30
Cambridge University
3660
http://sms.cam.ac.uk/media/2958801
Datadriven approach for indexingfree Xray crystallography
Chen, X
13 March 2019
09.3010.30
20190412T12:32:20+01:00
3660
2958801
true
16x9
false
no

Defect loops in 3D active nematics
ucs_sms_2901231_2911358
http://sms.cam.ac.uk/media/2911358
Defect loops in 3D active nematics
Beller, D
Monday 14th January 2019  16:15 to 17:00
Wed, 30 Jan 2019 10:34:29 +0000
Isaac Newton Institute
Beller, D
22135af67afef24aa310a02742acd383
f9a70f54aeec40bf2f24d93e072cff64
58ef3159c190c8a3d8f95f046e1add7a
529bf003160ff002262a613fce770677
Beller, D
Monday 14th January 2019  16:15 to 17:00
Beller, D
Monday 14th January 2019  16:15 to 17:00
Cambridge University
2543
http://sms.cam.ac.uk/media/2911358
Defect loops in 3D active nematics
Beller, D
Monday 14th January 2019  16:15 to 17:00
Coauthors: Guillaume Duclos, Minu Varghese, Matthew Peterson, Arvind Baskaran, Aparna Baskaran, Michael Hagan (Martin A. Fisher School of Physics, Brandeis University ), Debarghya Banerjee (Max Planck Institute for Dynamics and SelfOrganization, Göttingen), Federico Toschi (Department of Applied Physics, Eindhoven University of Technology), Sebastian Streichan, Zvonimir Dogic (Department of Physics, University of California, Santa Barbara), Vincenzo Vitelli (James Franck Institute and Department of Physics, University of Chicago), Robert Pelcovits (Department of Physics, Brown University), Thomas Powers (School of Engineering and Department of Physics, Brown University). Abstract: In 2D active nematics, internally driven chaotic flows are characterized by the continual production, motion, and annihilation of point defect pairs. We investigate the behavior of active nematics in 3D, for which we have developed an experimental model system of microtubules and molecular motors, as well as numerical modeling approaches. The defects characterizing chaotic flow are here curvilinear rather than pointlike. We present a theoretical model predicting a certain class of closed disclination loops to be the system’s generic singularities. Through detailed analysis of experimental and numerically generated configurations, we show how our predictions of defect topology, geometry, and dynamics provide important insights into this highly complex 3D system.
20190130T10:34:29+00:00
2543
2911358
true
16x9
false
no

Defects of Liquid Crystals
ucs_sms_2901231_2902477
http://sms.cam.ac.uk/media/2902477
Defects of Liquid Crystals
Zhang, P
Wednesday 16th January 2019  09:45 to 10:30
Wed, 16 Jan 2019 15:04:29 +0000
Isaac Newton Institute
Zhang, P
0b49a27bb38a6d6359310a7d3b202e6c
ad2209ce5741bcf1958a820fbc8f3841
4ade7fddb1c7ded576fd5b2782ec0afa
2b5a614fc4893119f766da49a7153302
Zhang, P
Wednesday 16th January 2019  09:45 to 10:30
Zhang, P
Wednesday 16th January 2019  09:45 to 10:30
Cambridge University
2858
http://sms.cam.ac.uk/media/2902477
Defects of Liquid Crystals
Zhang, P
Wednesday 16th January 2019  09:45 to 10:30
Defects are local breakings of symmetry in an ordered medium, which can be found in various fields of physics such as solids, liquid crystals, astrophysics and high energy physics. Defects in liquid crystals are of great practical importance in material science and theoretical interest in physics and mathematics. In this talk, I will review the representation, modeling and computation of defects in liquid crystals. Within the Landaude Gennes tensor model, we found a rich variety of defect patterns in topologically confined nematic liquid crystals, and the profiles of point defect and disclination line are obtained. The connection and difference between defect patterns under the tensor model and the vector model will be discussed. Finally, some conjectures and challenges are proposed to summarize the common characteristics of defects, in the hope of providing a deeper understanding of the defect pattern in nematic liquid crystals.
20190116T15:04:29+00:00
2858
2902477
true
16x9
false
no

Deformation avalanches in crystalline materials: some experimental, empirical, and modelling results
ucs_sms_2901231_2958951
http://sms.cam.ac.uk/media/2958951
Deformation avalanches in crystalline materials: some experimental, empirical, and modelling results
Zanzotto, G
15 March 2019
12.0013.00
Fri, 12 Apr 2019 12:48:30 +0100
Isaac Newton Institute
Zanzotto, G
d3ba2954687676b051b35e7914447c09
dc56b176260fbb523b63cb6a7b7eb194
142090dd717da5119aff0385d2fc7aeb
8e4e62aa0c846a5c96ee74ad386f4d0f
Zanzotto, G
15 March 2019
12.0013.00
Zanzotto, G
15 March 2019
12.0013.00
Cambridge University
3780
http://sms.cam.ac.uk/media/2958951
Deformation avalanches in crystalline materials: some experimental, empirical, and modelling results
Zanzotto, G
15 March 2019
12.0013.00
20190412T12:48:30+01:00
3780
2958951
true
16x9
false
no

Derivation of 3D line tension models for dislocations from geometrically nonlinear models
ucs_sms_2901231_2958966
http://sms.cam.ac.uk/media/2958966
Derivation of 3D line tension models for dislocations from geometrically nonlinear models
Garroni, A
14 March 2019
09.3010.30
Fri, 12 Apr 2019 13:14:25 +0100
Isaac Newton Institute
Garroni, A
4b62ae2c16b948950009096e9642b099
3c16f8d5ac58838237dc5efe5af5e285
18317ef4fb0c9d929b2dfe3441854a9e
Garroni, A
14 March 2019
09.3010.30
Garroni, A
14 March 2019
09.3010.30
Cambridge University
3440
http://sms.cam.ac.uk/media/2958966
Derivation of 3D line tension models for dislocations from geometrically nonlinear models
Garroni, A
14 March 2019
09.3010.30
20190412T13:14:26+01:00
3440
2958966
true
16x9
false
no

Design of effective bulk potentials for nematic liquid crystals via homogenisation
ucs_sms_2901231_2901904
http://sms.cam.ac.uk/media/2901904
Design of effective bulk potentials for nematic liquid crystals via homogenisation
Canevari, G
Monday 14th January 2019  14:30 to 15:15
Tue, 15 Jan 2019 13:51:39 +0000
Isaac Newton Institute
Canevari, G
bec7efc1a7829f651c77ee89b3f226c4
0a9a8bc2d7fd13b3029f47115605b0c6
c4709546e1ddd1005e2e2cdf4f0a1956
0ddd0e510874075d2e3a22fecf54f499
Canevari, G
Monday 14th January 2019  14:30 to 15:15
Canevari, G
Monday 14th January 2019  14:30 to 15:15
Cambridge University
2613
http://sms.cam.ac.uk/media/2901904
Design of effective bulk potentials for nematic liquid crystals via homogenisation
Canevari, G
Monday 14th January 2019  14:30 to 15:15
The material properties of a given nematic liquid crystal may be altered by dopants, i.e. suspended micro to nano particles in the nematic host. Even under weak anchoring conditions at the surface of the inclusions, and in the socalled "dilute regime" (i.e., when the total volume occupied by the inclusions is small), dopants can still have a significant effect; for instance, they can modify the nematicisotropic transition temperature. In this talk, we consider a Landaude Gennes model for a periodic suspension of small colloidal inclusions in a nematic host. By studying the homogenised limit, and proving rigorous convergence results for local minimisers, we compute the effective free energy for the doped material. In particular, we show that not only the phase transition temperature, but any coefficient of the quartic Landaude Gennes bulk potential can be tuned. The talk is based on a joint work with Arghir D. Zarnescu (BCAM, Bilbao, Spain).
20190115T13:51:39+00:00
2613
2901904
true
16x9
false
no

Design of Liquid Crystals for Microscale Dynamics  1
ucs_sms_2901231_2947312
http://sms.cam.ac.uk/media/2947312
Design of Liquid Crystals for Microscale Dynamics  1
Lavrentovich, O
Tuesday 26th March 2019  10:15 to 11:15
Wed, 27 Mar 2019 14:49:46 +0000
Isaac Newton Institute
Lavrentovich, O
0f44a25e3a110b614b2b74c9b683c00e
7a560b7f0cd0194392493127cdd19342
75f8117634cb2a3d49dbb2671cec24a5
855db38c07ed030f1eefbb63a07250c2
Lavrentovich, O
Tuesday 26th March 2019  10:15 to 11:15
Lavrentovich, O
Tuesday 26th March 2019  10:15 to 11:15
Cambridge University
3570
http://sms.cam.ac.uk/media/2947312
Design of Liquid Crystals for Microscale Dynamics  1
Lavrentovich, O
Tuesday 26th March 2019  10:15 to 11:15
Dynamics of small particles in fluids has fascinated scientists for centuries, since van Leeuwenhoek observed in 1674 tiny creatures, nowadays known as “bacteria”, swimming chaotically in a droplet of water. Much later, Brown found that even inanimate small particles, when placed in water, engage in a similar chaotic dynamics. If one could learn how to control and streamline the chaotic motion of particles such as bacteria and colloids at the microscale, that would open technological opportunities in areas such as transformation of stored or environmental energy into systematic motion, microrobotics, transport of matter at microscale, etc. Remarkably, bacteria and colloids driven by an external field do not obey the laws of thermodynamics and can be used to extract a useful work. This set of lecture presents an approach to command microscale dynamics by replacing an isotropic medium such as water with an anisotropic fluid, a liquid crystal. The liquid crystals are formed by elongated molecules that tend to align parallel to each other along a common direction called the director. As a result, physical properties, such as electric conductivity or viscosity depend on the direction of measurement, whether it is parallel or perpendicular to the director. Orientational order of the medium leads to new dynamic effects, such as anomalous diffusion [1] and formation of particlelike solitary waves [2]. By using a newly developed technique of nanophotonic photoalignment, the liquid crystal director can be patterned into any predesigned structure [3]. We demonstrate that the patterned liquid crystals can control microscale dynamics of inanimate particles such as solid colloids, fluid droplets, through the effects of nonlinear electrophoresis [4] and electroosmosis [5]. Moreover, plasmonic patterning of liquid crystals allows one to command the dynamics of swimming bacteria, guiding their trajectories, polarity of swimming and concentration in space [6]. The patterned director design can also be extended to liquid crystal elastomers, in which case the director field controls the thickness of elastomer coatings [7]. Some of these systems form an experimental playground for the exploration of outofequilibrium active matter, in which the levels of activity and degree of orientational order can be controlled separately.The work is supported by NSF DMREF DMS1729509 and by Office of Science, U.S. Department of Energy, grant DESC0019105.[1] T. Turiv, I. Lazo, A. Brodin, B. I. Lev, V. Reiffenrath, V. G. Nazarenko, and O. D. Lavrentovich, Effect of Collective Molecular Reorientations on Brownian Motion of Colloids in Nematic Liquid Crystal, Science 342, 13511354 (2013).[2] B. X. Li, V. Borshch, R. L. Xiao, S. Paladugu, T. Turiv, S. V. Shiyanovskii, and O. D. Lavrentovich, Electricallydriven threedimensional solitary waves as director bullets in nematic liquid crystals, Nature Communications 9, 2912 (2018).[3] Y. Guo, M. Jiang, C. Peng, K. Sun, O. D. Lavrentovich, and Q.H. Wei, HighResolution and HighThroughput Plasmonic Photopatterning of Complex Molecular Orientations in Liquid Crystals Advanced Materials 28, 23532358 (2016).[4] O. D. Lavrentovich, I. Lazo, and O. P. Pishnyak, Nonlinear electrophoresis of dielectric and metal spheres in a nematic liquid crystal, Nature 467, 947950 (2010).[5] I. Lazo, C. H. Peng, J. Xiang, S. V. Shiyanovskii, and O. D. Lavrentovich, Liquid crystalenabled electroosmosis through spatial charge separation in distorted regions as a novel mechanism of electrokinetics, Nature Communications 5, 5033 (2014).[6] C. Peng, T. Turiv, Y. Guo, Q.H. Wei, and O. D. Lavrentovich, Command of active matter by topological defects and patterns, Science 354, 882885 (2016).[7] G. Babakhanova, T. Turiv, Y. B. Guo, M. Hendrikx, Q. H. Wei, A. Schenning, D. J. Broer, and O. D. Lavrentovich, Liquid crystal elastomer coatings with programmed response of surface profile, Nature Communications 9, 456, 456 (2018).
20190327T14:49:46+00:00
3570
2947312
true
16x9
false
no

Design of Liquid Crystals for Microscale Dynamics  2
ucs_sms_2901231_2947327
http://sms.cam.ac.uk/media/2947327
Design of Liquid Crystals for Microscale Dynamics  2
Lavrentovich, O
Tuesday 26th March 2019  11:30 to 12:30
Wed, 27 Mar 2019 14:43:54 +0000
Isaac Newton Institute
Lavrentovich, O
c760474fd9826c4fb15eda220f7b4357
262ae28f0d141a543f0319a67664134c
23bce133fc3582b1b4fc9be4daac7ec3
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Lavrentovich, O
Tuesday 26th March 2019  11:30 to 12:30
Lavrentovich, O
Tuesday 26th March 2019  11:30 to 12:30
Cambridge University
2864
http://sms.cam.ac.uk/media/2947327
Design of Liquid Crystals for Microscale Dynamics  2
Lavrentovich, O
Tuesday 26th March 2019  11:30 to 12:30
20190327T14:43:54+00:00
2864
2947327
true
16x9
false
no

Design of Liquid Crystals for Microscale Dynamics  3
ucs_sms_2901231_2947462
http://sms.cam.ac.uk/media/2947462
Design of Liquid Crystals for Microscale Dynamics  3
Lavrentovich, O
Wednesday 27th March 2019  10:15 to 11:15
Wed, 27 Mar 2019 15:12:23 +0000
Isaac Newton Institute
Lavrentovich, O
4c96e3f57f659ac89a65e038d02da84f
100a21be67bbcc6c1e4ea00bbf41582b
f35b762da9f4fa1edc866e1b1440f891
95bf9f60ed0e2ac12ddb2dc08e0487a0
Lavrentovich, O
Wednesday 27th March 2019  10:15 to 11:15
Lavrentovich, O
Wednesday 27th March 2019  10:15 to 11:15
Cambridge University
3900
http://sms.cam.ac.uk/media/2947462
Design of Liquid Crystals for Microscale Dynamics  3
Lavrentovich, O
Wednesday 27th March 2019  10:15 to 11:15
20190327T15:12:23+00:00
3900
2947462
true
16x9
false
no

Design of Liquid Crystals for Microscale Dynamics  4
ucs_sms_2901231_2947469
http://sms.cam.ac.uk/media/2947469
Design of Liquid Crystals for Microscale Dynamics  4
Lavrentovich, O
Wednesday 27th March 2019  11:30 to 12:30
Wed, 27 Mar 2019 15:10:53 +0000
Isaac Newton Institute
Lavrentovich, O
ea0a51e0849176e913faf627b39d5989
ab6775b2e9276d6bc0a4ad0613164792
1460722a7f6e8e928d63c1b8c1bb1e6d
64ce6481f3f8a37db0774efdbc3b241a
Lavrentovich, O
Wednesday 27th March 2019  11:30 to 12:30
Lavrentovich, O
Wednesday 27th March 2019  11:30 to 12:30
Cambridge University
2156
http://sms.cam.ac.uk/media/2947469
Design of Liquid Crystals for Microscale Dynamics  4
Lavrentovich, O
Wednesday 27th March 2019  11:30 to 12:30
20190327T15:10:53+00:00
2156
2947469
true
16x9
false
no

Design of multilayer 2D materials  A multiscale simulation method based on noncommutative geometry
ucs_sms_2901231_2958705
http://sms.cam.ac.uk/media/2958705
Design of multilayer 2D materials  A multiscale simulation method based on noncommutative geometry
Cancès, E
11 March 2019
13.30 14.30
Fri, 12 Apr 2019 12:07:00 +0100
Isaac Newton Institute
Cancès, E
e9fc5229ccdaad61d42968babcac64fd
8aac76c973fbfff8dca49606eeeb6cd7
66a89a021b549243fae8f05b5822f4b3
8ea5f44067adb747a3f94d0e2dc71218
Cancès, E
11 March 2019
13.30 14.30
Cancès, E
11 March 2019
13.30 14.30
Cambridge University
3557
http://sms.cam.ac.uk/media/2958705
Design of multilayer 2D materials  A multiscale simulation method based on noncommutative geometry
Cancès, E
11 March 2019
13.30 14.30
20190412T12:07:01+01:00
3557
2958705
true
16x9
false
no

Designing colloidal structures: fast and slow dynamics
ucs_sms_2901231_2902470
http://sms.cam.ac.uk/media/2902470
Designing colloidal structures: fast and slow dynamics
Telo da Gama, M
Wednesday 16th January 2019  09:00 to 09:45
Wed, 16 Jan 2019 14:47:33 +0000
Isaac Newton Institute
Telo da Gama, M
ff0c2aa1e7f7253e5f545523addb337d
69d8c0b1767d8944a73d8719c20788f8
26c91fb011a2dcc52e306c6a47cebc62
252aa12cca9b142fc90bce3efc450eda
Telo da Gama, M
Wednesday 16th January 2019  09:00 to 09:45
Telo da Gama, M
Wednesday 16th January 2019  09:00 to 09:45
Cambridge University
2721
http://sms.cam.ac.uk/media/2902470
Designing colloidal structures: fast and slow dynamics
Telo da Gama, M
Wednesday 16th January 2019  09:00 to 09:45
Lowdensity networks of molecules or colloids form at low temperatures when the interparticle interactions are valence limited. Prototypical examples are networks of patchy particles, where the limited valence results from highly directional pairwise interactions. We combine extensive Langevin simulations and Wertheim’s theory of association to study these networks. We find a scalefree (relaxation) dynamics within the liquid–gas coexistence region, which differs from that usually observed for isotropic particles. While for isotropic particles the relaxation dynamics is driven by surface tension (coarsening), in lowdensity networks the slow relaxation proceeds through the formation of an intermediate nonequilibrium gel via a geometrical percolation transition. We show that the low temperature slow dynamics is universal, being observed also in the single phase region. C. S. Dias, J. M. Tavares, N. A. M. Araujo and M. M. Telo da Gama, Soft Matter 14, 2744 (2018).
20190116T14:47:34+00:00
2721
2902470
true
16x9
false
no

Different behaviour of materials closely satisfying supercompatibility
ucs_sms_2901231_2958752
http://sms.cam.ac.uk/media/2958752
Different behaviour of materials closely satisfying supercompatibility
Della Porta, F
12 March 2019
11.0012.00
Fri, 12 Apr 2019 12:24:50 +0100
Isaac Newton Institute
Della Porta, F
8790427beec71e46ca554c20acc1f6d1
75fcf90933d5c09b8d371c494c229527
5e85b4fe43c52fc6d26333d6b26ffbb3
054c85b7da0b94ba17f2b214186cfc24
Della Porta, F
12 March 2019
11.0012.00
Della Porta, F
12 March 2019
11.0012.00
Cambridge University
2976
http://sms.cam.ac.uk/media/2958752
Different behaviour of materials closely satisfying supercompatibility
Della Porta, F
12 March 2019
11.0012.00
20190412T14:11:18+01:00
2976
2958752
true
16x9
false
no

Effective behaviour of criticalcontrast PDEs: microresonances, frequency conversion, and time dispersive properties
ucs_sms_2901231_2942172
http://sms.cam.ac.uk/media/2942172
Effective behaviour of criticalcontrast PDEs: microresonances, frequency conversion, and time dispersive properties
Cherednichenko, K
Tuesday 26th February 2019  16:30 to 17:15
Wed, 20 Mar 2019 13:36:02 +0000
Isaac Newton Institute
Cherednichenko, K
7cdce0d1b3427e4ce8a9e32c7586bd3e
cea8c94a079b3662cf962f0fc4a13805
b4aca6a4106adffb6004f51d6a3c9634
a35f33ec58349fdee2af4b707e11464a
Cherednichenko, K
Tuesday 26th February 2019  16:30 to 17:15
Cherednichenko, K
Tuesday 26th February 2019  16:30 to 17:15
Cambridge University
3189
http://sms.cam.ac.uk/media/2942172
Effective behaviour of criticalcontrast PDEs: microresonances, frequency conversion, and time dispersive properties
Cherednichenko, K
Tuesday 26th February 2019  16:30 to 17:15
20190320T13:36:02+00:00
3189
2942172
true
16x9
false
no

Elasticity and Response in Mechanical Topological Lattices
ucs_sms_2901231_2986189
http://sms.cam.ac.uk/media/2986189
Elasticity and Response in Mechanical Topological Lattices
Lubensky, T
Thursday 16th May 2019  11:10 to 11:50
Fri, 17 May 2019 15:07:44 +0100
Isaac Newton Institute
Lubensky, T
e3d89da5eb5421dec3de23cadd00c4ae
2525410dd86ab7086bd14129c25d3cf5
332bfbddf0c63dee924aa30e5a2f9a6c
c76e8f508fc6a0e92c6e6784e560f90c
Lubensky, T
Thursday 16th May 2019  11:10 to 11:50
Lubensky, T
Thursday 16th May 2019  11:10 to 11:50
Cambridge University
2615
http://sms.cam.ac.uk/media/2986189
Elasticity and Response in Mechanical Topological Lattices
Lubensky, T
Thursday 16th May 2019  11:10 to 11:50
BallandSpring lattices that have a perfect balance between the number of degrees of freedom and the number of constraining springs under periodic boundary conditions have topologically protected zeroenergy surface modes and nonlinear elastic GuestHutchinson modes. This talk will provide an overview of these modes in various model systems, including one whose excitation spectrum matches that of a quantum model on a honeycomb lattice introduced by Kitaev. It will also discuss bulk and surface excitation in systems in which the number constraining springs exceeds the number of degrees of freedom.
20190517T15:07:44+01:00
2615
2986189
true
16x9
false
no

Emergence of phytoplankton patchiness at small scales in mild turbulence
ucs_sms_2901231_2922831
http://sms.cam.ac.uk/media/2922831
Emergence of phytoplankton patchiness at small scales in mild turbulence
Mazza, M
Wednesday 13th February 2019  16:40 to 17:20
Mon, 18 Feb 2019 12:34:53 +0000
Isaac Newton Institute
Mazza, M
d450988ad5a0f751c1d3f0a0df1553ad
4fc31650854dc9b730590b0419c0e150
6d82832ab3f96416507e6f244bec90bc
5c24e600af35117953bbedeaefec1a2a
Mazza, M
Wednesday 13th February 2019  16:40 to 17:20
Mazza, M
Wednesday 13th February 2019  16:40 to 17:20
Cambridge University
2302
http://sms.cam.ac.uk/media/2922831
Emergence of phytoplankton patchiness at small scales in mild turbulence
Mazza, M
Wednesday 13th February 2019  16:40 to 17:20
Sailors have known for millennia that periodically the seas appear of unusual color and can even turn red. These large swaths of colors stretching for tens or hundreds of km are caused by countless microscopic organisms called phytoplankton. These are microscopic algae that use sunlight to produce energy. They are the base of the marine food chain, and produce 50% or more of the oxygen in the atmosphere. Phytoplankton often encounter turbulence in their habitat. The spatial distribution of motile phytoplankton cells exhibits patchiness at distances of decimeter to millimeter scale for numerous species with different motility strategies. The explanation of this general phenomenon remains challenging. We combine particle simulations and continuum theory to study the emergence of patchiness in motile microorganisms in three
dimensions, by including hydrodynamic cellcell interactions, which grow more relevant as the density in the patches increases. By addressing the combined effects of motility, cellcell interaction and turbulent flow conditions, we uncover a general mechanism: the coupling of cellcell interactions to the turbulent dynamics favors the formation of dense patches.
[R. E. Breier, et al., Proc. Natl. Acad. Sci. USA 115, 12112 (2018)]
20190218T12:34:53+00:00
2302
2922831
true
16x9
false
no

Energy and dynamics of grain boundaries based on underlying mircrostructure
ucs_sms_2901231_2958938
http://sms.cam.ac.uk/media/2958938
Energy and dynamics of grain boundaries based on underlying mircrostructure
Xiang, Y
15 March 2019
09.3010.30
Fri, 12 Apr 2019 12:47:04 +0100
Isaac Newton Institute
Xiang, Y
051d44a6fda8c86c3626a94bb1e08af2
839e5b39e25256da02ca77c9e0f5c262
408eef851cf55a00f6a1207c9a996861
d7b8c50168b6e320ab835befee1d0245
Xiang, Y
15 March 2019
09.3010.30
Xiang, Y
15 March 2019
09.3010.30
Cambridge University
3550
http://sms.cam.ac.uk/media/2958938
Energy and dynamics of grain boundaries based on underlying mircrostructure
Xiang, Y
15 March 2019
09.3010.30
20190412T12:47:04+01:00
3550
2958938
true
16x9
false
no

Equilibrium measures for nonlocal energies: The effect of anisotropy
ucs_sms_2901231_2958768
http://sms.cam.ac.uk/media/2958768
Equilibrium measures for nonlocal energies: The effect of anisotropy
Scardia, L
12 March 2019
13.3014.30
Fri, 12 Apr 2019 12:26:26 +0100
Isaac Newton Institute
Scardia, L
bf3a77c7bd74efea20c3377aab9dce7e
8181207456e0e27ca8ab4908c36bfa76
57448ab9434c5025ecf5a810f4bffe87
d738d233dded7c44c1a95cf8e368d0bf
Scardia, L
12 March 2019
13.3014.30
Scardia, L
12 March 2019
13.3014.30
Cambridge University
3476
http://sms.cam.ac.uk/media/2958768
Equilibrium measures for nonlocal energies: The effect of anisotropy
Scardia, L
12 March 2019
13.3014.30
20190412T12:26:26+01:00
3476
2958768
true
16x9
false
no

Evolution of magnetoviscoelastic materials
ucs_sms_2901231_2984093
http://sms.cam.ac.uk/media/2984093
Evolution of magnetoviscoelastic materials
Schlömerkemper, A
Monday 13th May 2019  11:50 to 12:30
Tue, 14 May 2019 13:22:59 +0100
Isaac Newton Institute
Schlömerkemper, A
b445e296b41aa68c24ab2c1865ff6a11
65372d3c1afd149621a7d4cab5c00f70
bb39ae61bef7ad8a1ec2f5bd74167400
74d5dfcf6f17f51d2682fa8168c1bb1f
Schlömerkemper, A
Monday 13th May 2019  11:50 to 12:30
Schlömerkemper, A
Monday 13th May 2019  11:50 to 12:30
Cambridge University
2304
http://sms.cam.ac.uk/media/2984093
Evolution of magnetoviscoelastic materials
Schlömerkemper, A
Monday 13th May 2019  11:50 to 12:30
In this talk I will survey our recent approach to the modeling of magnetoviscoelastic materials. Our system of partial differential equations consists of the NavierStokes equations, the LandauLifshitzGilbert equation and an evolution equation for the deformation gradient. I will address modeling aspects, analytical results and potential applications.
20190514T13:22:59+01:00
2304
2984093
true
16x9
false
no

Exploiting entropy to enhance toughness in polymer gels with reversible crosslinks
ucs_sms_2901231_2984763
http://sms.cam.ac.uk/media/2984763
Exploiting entropy to enhance toughness in polymer gels with reversible crosslinks
Tito, N
Tuesday 14th May 2019  10:20 to 10:40
Wed, 15 May 2019 15:51:58 +0100
Isaac Newton Institute
Tito, N
0063b2f20cb3a52b82fea416c78d1a20
7a0291d703d6ef5411f5f3a77e62ae93
f9f18fd456a9c2e423cbbd2ea0802f0b
1191b4cbfc279aceab78a04200161437
Tito, N
Tuesday 14th May 2019  10:20 to 10:40
Tito, N
Tuesday 14th May 2019  10:20 to 10:40
Cambridge University
1199
http://sms.cam.ac.uk/media/2984763
Exploiting entropy to enhance toughness in polymer gels with reversible crosslinks
Tito, N
Tuesday 14th May 2019  10:20 to 10:40
CoAuthors: Costantino Creton, Cornelis Storm, Wouter Ellenbroek Entropy is the daunting "second half" of thermodynamics, universally encountered yet often overlooked when designing molecular recipes for new soft materials and structures. This talk seeks to inspire a line of thought on how entropy can be harnessed as a central design element in soft polymeric materials, for imbuing adaptability, robustness, and functional uniqueness. Highly elastic yet failureresistant polymer gels with reversible crosslinks [1] will be showcased as a recent example where entropy provides unexpected functionality. Using a combination of theory, molecular simulation, and polymer selfconsistent field theory for networks [2], I will discuss how entropy counterintuitively leads to spatial clustering of reversible crosslinks around permanent crosslinks in the polymer gel. This entropyinduced order leads the gel to be less prone to failure, while maintaining its high degree of extensibility [3]. Practical guidelines will be outlined to optimise this design in experiment, along with a discussion of key kinetic and timescale considerations. [1] Kean, Z. S.; et al. Adv. Mat. 2014, 26, 6013. [2] Tito, N. B.; Storm, C.; Ellenbroek, W. G. Macromolecules 2017, 50, 9788. [3] Tito, N. B.; Creton, C.; Storm, C; Ellenbroek, W. G. Soft Matter 2019, 15, 2190.
20190515T15:51:58+01:00
1199
2984763
true
16x9
false
no

Finding the optimal nets for selffolding Kirigami
ucs_sms_2901231_2916522
http://sms.cam.ac.uk/media/2916522
Finding the optimal nets for selffolding Kirigami
Araujo, N
Wednesday 6th February 2019  17:20 to 18:40
Thu, 07 Feb 2019 14:57:25 +0000
Isaac Newton Institute
Araujo, N
af49cbdfd3c866a7657e1a853f6ad5d7
d55081474d8fe48ab1ce1cba54aa8f6a
5c31c11b356b22c46adaca7b9150ee4c
e372b866eee08213cac0146e46ca4384
Araujo, N
Wednesday 6th February 2019  17:20 to 18:40
Araujo, N
Wednesday 6th February 2019  17:20 to 18:40
Cambridge University
1968
http://sms.cam.ac.uk/media/2916522
Finding the optimal nets for selffolding Kirigami
Araujo, N
Wednesday 6th February 2019  17:20 to 18:40
Threedimensional shells can be synthesized from the spontaneous selffolding of twodimensional templates of interconnected panels, called nets. However, some nets are more likely to selffold into the desired shell under random movements. The optimal nets are the ones that maximize the number of vertex connections, i.e., vertices that have only two of its faces cut away from each other in the net. Previous methods for finding such nets are based on random search and thus do not guarantee the optimal solution. We proposed a deterministic procedure [1]. Our method allows not only to design the selfassembly of much larger shell structures but also to apply additional design criteria, as a complete catalog of the nets with the maximum number of vertex connections is obtained.
[1] N. A. M. Araújo, R. A. da Costa, S. N. Dorogovtsev, J. F. F. Mendes, Physical Review Letters
120, 188001 (2018).
20190207T14:57:26+00:00
1968
2916522
true
16x9
false
no

Geometric Topology of Liquid Crystal Textures: Chirality and Bend
ucs_sms_2901231_2984116
http://sms.cam.ac.uk/media/2984116
Geometric Topology of Liquid Crystal Textures: Chirality and Bend
Alexander, G
Monday 13th May 2019  15:20 to 16:00
Tue, 14 May 2019 13:28:29 +0100
Isaac Newton Institute
Alexander, G
97f9ea1ed58b378e31e9f98ed835151e
927a21e84d16bc2f2c64ea75372084e8
03ead16b336759191c371fc7f8182d4d
0e46e18843ff1ed503eb6587aac4dc72
Alexander, G
Monday 13th May 2019  15:20 to 16:00
Alexander, G
Monday 13th May 2019  15:20 to 16:00
Cambridge University
2418
http://sms.cam.ac.uk/media/2984116
Geometric Topology of Liquid Crystal Textures: Chirality and Bend
Alexander, G
Monday 13th May 2019  15:20 to 16:00
The textures and phases of liquid crystals are replete with geometric motifs, and the geometric approach to elasticity underpins a large portion of nonlinear theories. Despite this, the basic characterisation of topology comes from the homotopy theory without particular attention to geometric features. I will describe our recent work developing geometric approaches to liquid crystal topology, describing cholesteric point defects and topological chirality, and the geometric features of bend distortions, illustrated by applications to the twistbend nematic phase.
20190514T13:28:29+01:00
2418
2984116
true
16x9
false
no

Geometry and assembly at fluid boundaries  1
ucs_sms_2901231_2947284
http://sms.cam.ac.uk/media/2947284
Geometry and assembly at fluid boundaries  1
Stebe, K
Monday 25th March 2019  13:30 to 14:30
Wed, 27 Mar 2019 14:35:28 +0000
Isaac Newton Institute
Stebe, K
37ee7aa0ece8afcad918685babb899d4
61e95c5d374189c7c721db0f5de3256b
a1fce7679dfa5c9c3d0024943f003db1
56de05b500a12e4622e6d70f0709cf00
Stebe, K
Monday 25th March 2019  13:30 to 14:30
Stebe, K
Monday 25th March 2019  13:30 to 14:30
Cambridge University
3319
http://sms.cam.ac.uk/media/2947284
Geometry and assembly at fluid boundaries  1
Stebe, K
Monday 25th March 2019  13:30 to 14:30
20190327T14:35:28+00:00
3319
2947284
true
16x9
false
no

Geometry and assembly at fluid boundaries  2
ucs_sms_2901231_2947291
http://sms.cam.ac.uk/media/2947291
Geometry and assembly at fluid boundaries  2
Stebe, K
Monday 25th March 2019  14:45 to 15:45
Wed, 27 Mar 2019 14:28:29 +0000
Isaac Newton Institute
Stebe, K
2b2fff8b0fa9f0495298c369c313a461
83f00b04f647f440ad1e551ff847fa47
14f9ee17adca1aa297aeb8f0ab73f9ff
89061ab2b68ef9682addbf6cef9f6d12
Stebe, K
Monday 25th March 2019  14:45 to 15:45
Stebe, K
Monday 25th March 2019  14:45 to 15:45
Cambridge University
2586
http://sms.cam.ac.uk/media/2947291
Geometry and assembly at fluid boundaries  2
Stebe, K
Monday 25th March 2019  14:45 to 15:45
20190327T14:28:29+00:00
2586
2947291
true
16x9
false
no

Geometry and assembly at fluid boundaries  3
ucs_sms_2901231_2947334
http://sms.cam.ac.uk/media/2947334
Geometry and assembly at fluid boundaries  3
Stebe, K
Tuesday 26th March 2019  13:30 to 14:30
Wed, 27 Mar 2019 14:50:01 +0000
Isaac Newton Institute
Stebe, K
9bd3593a3b24360e7c3fe150bc2cfe39
3cf43e4c13c01c358314765a647b1f52
027e65359f9b25b787d2bc887e4e040e
c49d62897a85f8dbac7d30da0f91530a
Stebe, K
Tuesday 26th March 2019  13:30 to 14:30
Stebe, K
Tuesday 26th March 2019  13:30 to 14:30
Cambridge University
3492
http://sms.cam.ac.uk/media/2947334
Geometry and assembly at fluid boundaries  3
Stebe, K
Tuesday 26th March 2019  13:30 to 14:30
20190327T14:50:01+00:00
3492
2947334
true
16x9
false
no

Gibbs Ensembles of Partitions: from limit shapes to hydrodynamic limits
ucs_sms_2901231_2992470
http://sms.cam.ac.uk/media/2992470
Gibbs Ensembles of Partitions: from limit shapes to hydrodynamic limits
Fatkullin, I
Tuesday 21st May 2019  15:00 to 16:00
Tue, 28 May 2019 09:42:47 +0100
Isaac Newton Institute
Fatkullin, I
f18bfe22a9db7a684ca7679e8dc96245
fe29327adcfffc67eff1e4135a38d8d6
b30ffdc7b09717da1b370361af73f734
8c7dd9f1fd2aa54848d226b1030b2067
Fatkullin, I
Tuesday 21st May 2019  15:00 to 16:00
Fatkullin, I
Tuesday 21st May 2019  15:00 to 16:00
Cambridge University
3600
http://sms.cam.ac.uk/media/2992470
Gibbs Ensembles of Partitions: from limit shapes to hydrodynamic limits
Fatkullin, I
Tuesday 21st May 2019  15:00 to 16:00
Distributions of aggregate sizes in various polymerization processes may be described by measures on partitions of integers and sets. We explicitly compute limit shapes for several grand canonical Gibbs ensembles and prove that all possible limit shapes for these ensembles fall into distinct classes determined by the asymptotics of the internal energies of aggregates. Further on, we establish hydrodynamic limits for a class of stochastic processes on the associated Young diagrams and deriving PDEs governing the evolution of limit shapes in suitable asymptotic regimes.
20190528T09:42:47+01:00
3600
2992470
true
16x9
false
no

Hard and soft packing in the molecular organization of liquid crystals
ucs_sms_2901231_2952953
http://sms.cam.ac.uk/media/2952953
Hard and soft packing in the molecular organization of liquid crystals
Zannoni, C
Wednesday 3rd April 2019  15:50 to 16:30
Thu, 04 Apr 2019 14:33:51 +0100
Isaac Newton Institute
Zannoni, C
5ef03cbf32a8d63ee17b653a016f293e
ebb530b9f8a93e6894a8cd4acff1e367
533bde1b5cb114f974b5b6cf1f448bb8
e24eafc97f5aa1c776fa22e52c335ff0
Zannoni, C
Wednesday 3rd April 2019  15:50 to 16:30
Zannoni, C
Wednesday 3rd April 2019  15:50 to 16:30
Cambridge University
2657
http://sms.cam.ac.uk/media/2952953
Hard and soft packing in the molecular organization of liquid crystals
Zannoni, C
Wednesday 3rd April 2019  15:50 to 16:30
The first generation of theories and computer simulations of liquid crystals have made drastic and often contrasting assumptions on the model representation of constituent mesogens and on the type of intermolecular interactions (e.g purely attractive in MaierSaupe type and purely hard repulsive in Onsager models). Computer simulations of liquid crystals, that started with simple lattice models, have upgraded over the years to offlattice models where molecules are replaced by relatively simple objects endowed with purely steric or attractive and repulsive type interactions of various softness and, more recently, to very realistic fully atomistic models. In the talk we shall briefly summarize the main features of these models and show various examples for the prediction of liquid crystal phase behavior starting from microscopic models. The contribution of different interactions to the phase morphologies obtained as well as open problems will be discussed.
20190404T14:33:51+01:00
2657
2952953
true
16x9
false
no

Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  1
ucs_sms_2901231_2948965
http://sms.cam.ac.uk/media/2948965
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  1
PalffyMuhoray, P
Thursday 28th March 2019  11:30 to 12:30
Fri, 29 Mar 2019 12:25:53 +0000
Isaac Newton Institute
PalffyMuhoray, P
31323b2afc1bc6e946945315687bb3c7
5cbbae2218761d86505a39749a01b630
09aa35e2f5f87381c38166cdd6c61cbc
a94c7bff7c5adecbda0b60b85b7abde2
PalffyMuhoray, P
Thursday 28th March 2019  11:30 to 12:30
PalffyMuhoray, P
Thursday 28th March 2019  11:30 to 12:30
Cambridge University
3471
http://sms.cam.ac.uk/media/2948965
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  1
PalffyMuhoray, P
Thursday 28th March 2019  11:30 to 12:30
20190329T12:25:54+00:00
3471
2948965
true
16x9
false
no

Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  2
ucs_sms_2901231_2948981
http://sms.cam.ac.uk/media/2948981
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  2
PalffyMuhoray, P
Thursday 28th March 2019  14:45 to 15:45
Fri, 29 Mar 2019 12:29:57 +0000
Isaac Newton Institute
PalffyMuhoray, P
d2dd01ee0f4df9a873f20a6d53f53e8b
8a0493b85fa5b1e0ae24588f75f8b847
ed1e925c13caa639bf097096b04da60c
08aca72f70dddc27ef2789a3a82f2211
PalffyMuhoray, P
Thursday 28th March 2019  14:45 to 15:45
PalffyMuhoray, P
Thursday 28th March 2019  14:45 to 15:45
Cambridge University
3660
http://sms.cam.ac.uk/media/2948981
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  2
PalffyMuhoray, P
Thursday 28th March 2019  14:45 to 15:45
20190329T12:29:57+00:00
3660
2948981
true
16x9
false
no

Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  3
ucs_sms_2901231_2948988
http://sms.cam.ac.uk/media/2948988
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  3
PalffyMuhoray, P
Thursday 28th March 2019  16:00 to 17:00
Fri, 29 Mar 2019 12:29:15 +0000
Isaac Newton Institute
PalffyMuhoray, P
9e111685173669f132c391d81adce756
48508c76b785a5000752bbd7a1f1b644
679f66e2725b7b48e427b14c5a513a30
67c3b810aec5720b3b5758be91269b66
PalffyMuhoray, P
Thursday 28th March 2019  16:00 to 17:00
PalffyMuhoray, P
Thursday 28th March 2019  16:00 to 17:00
Cambridge University
3341
http://sms.cam.ac.uk/media/2948988
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  3
PalffyMuhoray, P
Thursday 28th March 2019  16:00 to 17:00
20190329T12:29:15+00:00
3341
2948988
true
16x9
false
no

Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  4
ucs_sms_2901231_2949003
http://sms.cam.ac.uk/media/2949003
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  4
PalffyMuhoray, P
Friday 29th March 2019  10:15 to 11:15
Fri, 29 Mar 2019 12:27:54 +0000
Isaac Newton Institute
PalffyMuhoray, P
44cebe9c4dab5b597810195d35970a84
d01823905ffd718bd4e4a67241fa2c55
3fef5c7806fea7a5130847d28a4ec52e
1f2c8d032aaa6140b3e3cdac710af4cc
PalffyMuhoray, P
Friday 29th March 2019  10:15 to 11:15
PalffyMuhoray, P
Friday 29th March 2019  10:15 to 11:15
Cambridge University
2755
http://sms.cam.ac.uk/media/2949003
Heliconical cholesteric liquid crystals: selfassembled tunable photonic bandgap materials  4
PalffyMuhoray, P
Friday 29th March 2019  10:15 to 11:15
20190329T12:27:54+00:00
2755
2949003
true
16x9
false
no

Highthroughput search for new phase transformation materials with low hysteresis
ucs_sms_2901231_2902456
http://sms.cam.ac.uk/media/2902456
Highthroughput search for new phase transformation materials with low hysteresis
Lovvik, O
Tuesday 15th January 2019  11:00 to 11:45
Wed, 16 Jan 2019 14:40:30 +0000
Isaac Newton Institute
Lovvik, O
f979ef9b81f714c1e5f58896f2c4f0d4
9029c8b83b13e76ab823d3cfd2c0854e
4dd10ac6dbf705b92730c32cf8ed7848
47b709a023385e4cd2dee5995fd9055f
Lovvik, O
Tuesday 15th January 2019  11:00 to 11:45
Lovvik, O
Tuesday 15th January 2019  11:00 to 11:45
Cambridge University
2215
http://sms.cam.ac.uk/media/2902456
Highthroughput search for new phase transformation materials with low hysteresis
Lovvik, O
Tuesday 15th January 2019  11:00 to 11:45
Coauthors: Monika Løberg (University of Oslo), Nicholas Pike (University of Oslo) Phase transformation materials (PTMs) can be used for energy harvesting of heat from lowtemperature heat sources if the phase transformation is accompanied by an abrupt jump in a physical property like magnetization or polarization. In addition, the temperature hysteresis should be low in order to prevent losses. The criteria for this supercompatibility can be described in terms of the crystal structure of the phases. We are exploiting this in a new project where we are using various experimental and theoretical highthroughput techniques to search for unknown PTMs with very low hysteresis and a large change in potential energy. Some preliminary results are shown and discussed in light of the recent international progress in the field.
20190116T14:40:30+00:00
2215
2902456
true
16x9
false
no

Hydrodynamic assembly of out of equilibrium colloids
ucs_sms_2901231_2916998
http://sms.cam.ac.uk/media/2916998
Hydrodynamic assembly of out of equilibrium colloids
Lintuvuori, J
Wednesday 6th February 2019  16:40 to 17:20
Fri, 08 Feb 2019 09:13:43 +0000
Isaac Newton Institute
Lintuvuori, J
86155b05aa5c8af778d6cc9e5e04c395
a5bf45e9cd081b108a3215117e783813
b341f7d3cfbc1e7776fc2d2832cd9488
3f2e66166721c91e168979c875ba777c
Lintuvuori, J
Wednesday 6th February 2019  16:40 to 17:20
Lintuvuori, J
Wednesday 6th February 2019  16:40 to 17:20
Cambridge University
2178
http://sms.cam.ac.uk/media/2916998
Hydrodynamic assembly of out of equilibrium colloids
Lintuvuori, J
Wednesday 6th February 2019  16:40 to 17:20
In this talk, I will describe our recent and ongoing simulation efforts of hydrodynamic stabilisation of coherent structures formed by out of equilibrium spherical (colloidal) particles suspended in a fluid. I will provide examples of both internally and externally driven systems. In the first case we will consider active (selfpropelling)particles, while in the second case a system of driven colloidal spinners is created by energising passive particles by an external rotational drive. In both of these systems, there exists an unexpected coupling between translational and rotational motion: Spherical active particles, modelled as squirmers, can form small hydrodynamically bound chiral spinners consisting of two or three particles, when exposed to gravitylike aligning field near a surface. Passive but rotationally driven particles show a spontaneous formation of a large scale vortex at low but finite Reynolds numbers. Finally, I will discuss mixtures of the driven spinners, where the other component can be either passive particles or particles with an opposite spin giving a rise to a racemic mixture.
20190208T09:13:43+00:00
2178
2916998
true
16x9
false
no

Incompatible microstructure of martensite and kink deformation
ucs_sms_2901231_2958784
http://sms.cam.ac.uk/media/2958784
Incompatible microstructure of martensite and kink deformation
Inamura, T
12 March 2019
16.0017.00
Fri, 12 Apr 2019 12:28:24 +0100
Isaac Newton Institute
Inamura, T
60af03f2dd3df123e090be3b3e1b4235
b3946187525a571b42aaecb49337103c
45abc950ebf1f02e5992fc477f466ec1
3095f378aff07b6139691df89df018b2
Inamura, T
12 March 2019
16.0017.00
Inamura, T
12 March 2019
16.0017.00
Cambridge University
2920
http://sms.cam.ac.uk/media/2958784
Incompatible microstructure of martensite and kink deformation
Inamura, T
12 March 2019
16.0017.00
20190412T12:28:24+01:00
2920
2958784
true
16x9
false
no

Interfaces with singularities: understanding phase transitions in nematic liquid crystals
ucs_sms_2901231_2903794
http://sms.cam.ac.uk/media/2903794
Interfaces with singularities: understanding phase transitions in nematic liquid crystals
Golovaty, D
Friday 18th January 2019  09:45 to 10:30
Fri, 18 Jan 2019 16:22:56 +0000
Isaac Newton Institute
Golovaty, D
9baa3803acd0dc380b883d27b495974a
0cffe49796eb64a6ee9d85cf7650ce6e
0f0ffb86a1ceef4ccb7eab6c30b48130
67c76f2132ed809af46931bd0935434a
Golovaty, D
Friday 18th January 2019  09:45 to 10:30
Golovaty, D
Friday 18th January 2019  09:45 to 10:30
Cambridge University
2759
http://sms.cam.ac.uk/media/2903794
Interfaces with singularities: understanding phase transitions in nematic liquid crystals
Golovaty, D
Friday 18th January 2019  09:45 to 10:30
Experimental data indicates that the nematictoisotropic phase transition in liquid crystals may proceed via evolution of interfaces that are not smooth. In this talk, our goal is to provide a possible explanation for the observed singularities of the phase boundaries. In order to develop an initial understanding of transitions between the ordered and disordered states, we formulate a simple toy model based on the modified GinzburgLandautype energy defined over vector fields on the plane. The corresponding variational model consists of anisotropic gradient terms and a potential that vanishes on two disconnected sets. The principal observation from the study of the simplified model is that the phase boundary singularities can be explained by large disparity between the elastic constants in the gradient contribution to the energy. In the talk we will present a combination of rigorous analysis and numerics that leads to this conclusion. This is a joint work with Michael Novack, Peter Sternberg, and Raghavendra Venkatraman.
20190118T16:22:56+00:00
2759
2903794
true
16x9
false
no

Kirk Distinguished Visiting Fellow Lecture: Variational Methods in Image Processing and in the Mathematical Analysis of Novel Advanced Materials
ucs_sms_2901231_2983445
http://sms.cam.ac.uk/media/2983445
Kirk Distinguished Visiting Fellow Lecture: Variational Methods in Image Processing and in the Mathematical Analysis of Novel Advanced Materials
Fonseca, I
Friday 10th May 2019  16:00 to 17:00
Mon, 13 May 2019 09:26:00 +0100
Isaac Newton Institute
Fonseca, I
92ef98fb32f66248ca2c872bfb410f56
b84792796abb9e912ab9e36428484fad
94cb4fb3ef4ec1300d7b5c531ca104a9
cd3beaf05d2df9d804d3dd46c7f351b2
Fonseca, I
Friday 10th May 2019  16:00 to 17:00
Fonseca, I
Friday 10th May 2019  16:00 to 17:00
Cambridge University
4380
http://sms.cam.ac.uk/media/2983445
Kirk Distinguished Visiting Fellow Lecture: Variational Methods in Image Processing and in the Mathematical Analysis of Novel Advanced Materials
Fonseca, I
Friday 10th May 2019  16:00 to 17:00
In this talk we will use variational models involving density measures of different dimensionality to study training/learning schemes for a novel class of imageprocessing operators that provides a unified approach to the standard regularizers and PDEbased approaches to image denoising.
To illustrate the relevance of similar bulksurface energy models in the study of novel materials, we will analyze the onset of manmade nanocrystals of semiconducting materials (quantum dots). Their formation and assembly patterns play a central role in nanotechnology, and in particular in the optoelectronic properties of semiconductors. Changing the dots' size and shape gives rise to many applications that permeate our daily lives. As the creation of quantum dots evolves with time, materials defects appear and these may strongly influence material properties, including rigidity and conductivity. The regularity and evolution of the quantum dots shapes, and the nucleation and motion of dislocations will be addressed.
20190513T09:26:00+01:00
4380
2983445
true
16x9
false
no

Learning interactions from microscopic observables
ucs_sms_2901231_2958830
http://sms.cam.ac.uk/media/2958830
Learning interactions from microscopic observables
BartokPartay, A
Wednesday 13 March 2019
13.3014.30
Fri, 12 Apr 2019 12:35:35 +0100
Isaac Newton Institute
BartokPartay, A
7a64fdc0289824f5d79fa78df76a934a
7d68f9268495c5565d2df2fb09303d11
e932f5d50a873bf7d542b958f6c0f936
b823c5677d0cdb978a0cf0cb7b328dfc
BartokPartay, A
Wednesday 13 March 2019
13.3014.30
BartokPartay, A
Wednesday 13 March 2019
13.3014.30
Cambridge University
3400
http://sms.cam.ac.uk/media/2958830
Learning interactions from microscopic observables
BartokPartay, A
Wednesday 13 March 2019
13.3014.30
20190412T12:35:35+01:00
3400
2958830
true
16x9
false
no

Liquid crystal metamaterials from nematic colloidal platelets
ucs_sms_2901231_2987764
http://sms.cam.ac.uk/media/2987764
Liquid crystal metamaterials from nematic colloidal platelets
Pusovnik, A
Wednesday 15th May 2019  10:20 to 10:40
Mon, 20 May 2019 09:47:29 +0100
Isaac Newton Institute
Pusovnik, A
6143236c1306ad1fe9c8d5880e422fc9
9b24df35fdca5f7dddced52a38867c53
b272202d030ef9d8c85286cf986c9348
dc2fc61f67c2497f2986e7a14e1de511
Pusovnik, A
Wednesday 15th May 2019  10:20 to 10:40
Pusovnik, A
Wednesday 15th May 2019  10:20 to 10:40
Cambridge University
1208
http://sms.cam.ac.uk/media/2987764
Liquid crystal metamaterials from nematic colloidal platelets
Pusovnik, A
Wednesday 15th May 2019  10:20 to 10:40
Metamaterials are artificial materials with properties otherwise not existing in nature. This is achieved through the design of its constituent building blocks, which are generally several times smaller than the operating wavelength. An interesting route for the fabrication of photonic metamaterials is their selfassembly in liquid crystals. Here, we firstly determine the optimal geometrical parameters of a single split ring resonator (SRR) colloidal particle in order to achieve the stability of the 2D and 3D SRR structures in liquid crystals using free energy calculations. Then we focus on the optical response of such a composed material, notably the resonances in the transmissivity spectra, and tunability of optical properties of the SRR colloidal crystal with external fields.
20190520T09:47:29+01:00
1208
2987764
true
16x9
false
no

Magnetic skyrmions in spherical thin films
ucs_sms_2901231_2980128
http://sms.cam.ac.uk/media/2980128
Magnetic skyrmions in spherical thin films
Di Fratta, G
Wednesday 1st May 2019  15:00 to 16:00
Wed, 08 May 2019 08:58:32 +0100
Isaac Newton Institute
Di Fratta, G
dad62af571aa55f310508fff4346effe
b7f097e28c5b4f3c545a29a70fdb1b9e
471e4e8b4eb1b55f504de0249c5ca4db
aa77015b5651d8cb3474684fdc5352a6
Di Fratta, G
Wednesday 1st May 2019  15:00 to 16:00
Di Fratta, G
Wednesday 1st May 2019  15:00 to 16:00
Cambridge University
3135
http://sms.cam.ac.uk/media/2980128
Magnetic skyrmions in spherical thin films
Di Fratta, G
Wednesday 1st May 2019  15:00 to 16:00
Curved thin films are currently of great interest due to their capability to support spontaneous skyrmion solutions, i.e., chiral spin textures observable in a stable state even when no spinorbit coupling mechanism, in the guise of DzyaloshinskiiMoriya interaction (DMI), is considered. The evidence of these states sheds light on the role of the geometry in magnetism: chiral spintextures can be stabilized by curvature effects only, in contrast to the planar case for which the DMI is required. In addition to fundamental reasons, the interest in these geometries is triggered by recent advances in the fabrication of magnetic spherical hollow nanoparticles, which lead to artificial materials with unexpected characteristics and numerous applications ranging from logic devices to biomedicine. In this talk, after a brief overview of the existing literature on the micromagnetics of curved thin films, we will focus on the investigation of magnetic skyrmions in spherical thin films. The question will lead to a sharp Poincarétype inequality that allows for a precise characterization of the global minimizers of the micromagnetic energy functional on the 2sphere.
20190508T08:58:32+01:00
3135
2980128
true
16x9
false
no

Making Faces: Universal Inverse Design of Thin Nematic Elastomer Surfaces
ucs_sms_2901231_2984108
http://sms.cam.ac.uk/media/2984108
Making Faces: Universal Inverse Design of Thin Nematic Elastomer Surfaces
Aharoni, H
Monday 13th May 2019  13:30 to 14:10
Tue, 14 May 2019 13:26:23 +0100
Isaac Newton Institute
Aharoni, H
f7bf1006050e7261044767333357db60
b7975cb1639200670d48f308ae4645e6
023fccb9eeacf40db6a028a98384a23b
ac71e7585455f4c53f2c292b9a6c6159
Aharoni, H
Monday 13th May 2019  13:30 to 14:10
Aharoni, H
Monday 13th May 2019  13:30 to 14:10
Cambridge University
2497
http://sms.cam.ac.uk/media/2984108
Making Faces: Universal Inverse Design of Thin Nematic Elastomer Surfaces
Aharoni, H
Monday 13th May 2019  13:30 to 14:10
Thin nematic elastomer sheets can be programmed, via the nematic director field embedded into them, to take different shapes in different environments. Recent experiments from various groups demonstrate excellent control over the director field, thus opening a door for achieving accurate and versatile designs of shapeshifting surfaces. At the crux of any effort to implement this design mechanism lies the inverse design problem  given an arbitrary surface geometry, constructing the director field that would induce it. In this talk I describe several aspects of this inverse problem. I present a numerical algorithm for finding global approximate solutions for any 2D geometry. I also show that many exact solutions always exist locally and can be readily integrated, and classify the set of all director fields that deform into an arbitrary given geometry. These results allow optimizing the resultant director fields for different purposes, e.g. maximizing the domain of a global solution, increasing its robustness, reducing residual stresses, or controlling the entire shapeshifting path.
20190514T13:26:23+01:00
2497
2984108
true
16x9
false
no

Manipulating droplets on lubricant impregnated surfaces
ucs_sms_2901231_2903746
http://sms.cam.ac.uk/media/2903746
Manipulating droplets on lubricant impregnated surfaces
LedesmaAguilar, R
Thursday 17th January 2019  14:30 to 15:15
Fri, 18 Jan 2019 16:02:02 +0000
Isaac Newton Institute
LedesmaAguilar, R
9f124f493356a99a4b764dd1444d5c8c
76fa46c1d3d4bd27b5b745d8ed440789
fcb478c7d0bf8aa1396e4915a74913ab
00ab960b9afe1adce305e476f97c1789
LedesmaAguilar, R
Thursday 17th January 2019  14:30 to 15:15
LedesmaAguilar, R
Thursday 17th January 2019  14:30 to 15:15
Cambridge University
2580
http://sms.cam.ac.uk/media/2903746
Manipulating droplets on lubricant impregnated surfaces
LedesmaAguilar, R
Thursday 17th January 2019  14:30 to 15:15
Lubricant impregnated surfaces are bioinspired surfaces that offer virtually no static friction to the motion of droplets. In this talk I will present experimental, theoretical and simulation results that demonstrate how droplets can be manipulated on such surfaces.
20190118T16:02:02+00:00
2580
2903746
true
16x9
false
no

Materials from Mathematics
ucs_sms_2901231_2902442
http://sms.cam.ac.uk/media/2902442
Materials from Mathematics
James, R
Tuesday 15th January 2019  09:00 to 09:45
Wed, 16 Jan 2019 14:39:58 +0000
Isaac Newton Institute
James, R
1208a36d1c037aec95cd7540e5465063
6ae9d09f14c9f475fccc8a65e011d0e6
05919c6f0c44139be3ab5e03626669e4
39301d54bab2793130bf9ef09f5fca15
James, R
Tuesday 15th January 2019  09:00 to 09:45
James, R
Tuesday 15th January 2019  09:00 to 09:45
Cambridge University
2786
http://sms.cam.ac.uk/media/2902442
Materials from Mathematics
James, R
Tuesday 15th January 2019  09:00 to 09:45
We present some recent examples of new materials whose synthesis was guided by some essentially mathematical ideas. They are materials that undergo phase transformations from one crystal structure to another, with a change of shape but without diffusion. They are hard materials, but nevertheless show liquidlike changes of microstructure under a fraction of a degree change of temperature. The underlying mathematical theory was designed to identify alloys that show low hysteresis and exceptional reversibility. The new alloys, of which Zn_45Au_30Cu_25 and Ti_54.7Ni_30.7Cu_12.3Co_2.3 are currently the best examples, do show unprecedented levels of these properties, but also raise fundamental questions for mathematical theory. Magnetoelectric properties of solids are often sensitive to lattice parameters, so they can be switched on and off at a phase transformation: briefly, multiferroism by reversible phase transformation. This switching can be combined with induction in the ferromagnetic case, or capacitance in the ferroelectric case, to yield devices that convert heat directly to electricity, without a separate electrical generator. We describe briefly the associated mathematical theory. The resulting multiferroics provide interesting possible ways to recover the vast amounts of energy stored on earth at small temperature difference. They move heat produced by natural and manmade sources from higher to lower temperature and therefore contribute negatively to global warming.
20190116T14:39:59+00:00
2786
2902442
true
16x9
false
no

Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  1
ucs_sms_2901231_2947298
http://sms.cam.ac.uk/media/2947298
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  1
Luskin, M
Monday 25th March 2019  16:00 to 17:00
Wed, 27 Mar 2019 14:47:12 +0000
Isaac Newton Institute
Luskin, M
9e116afe31b206f04352a58ab8e57de3
adf9bb8a04d41758243876d904225d57
abdf94ba03285cb49361e552e3c04398
d65f2facc689eec52d12107e770587da
Luskin, M
Monday 25th March 2019  16:00 to 17:00
Luskin, M
Monday 25th March 2019  16:00 to 17:00
Cambridge University
3660
http://sms.cam.ac.uk/media/2947298
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  1
Luskin, M
Monday 25th March 2019  16:00 to 17:00
20190327T14:47:12+00:00
3660
2947298
true
16x9
false
no

Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  2
ucs_sms_2901231_2947305
http://sms.cam.ac.uk/media/2947305
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  2
Luskin, M
Tuesday 26th March 2019  09:00 to 10:00
Wed, 27 Mar 2019 14:44:31 +0000
Isaac Newton Institute
Luskin, M
a27f98d536070fa1bb9eb6417c26cdba
6de00ce0f61b5bf6256f2699b0f8705d
61b7148879eced7aa424b9123ffd198c
c9b21eec63005298266f83cb47208d4a
Luskin, M
Tuesday 26th March 2019  09:00 to 10:00
Luskin, M
Tuesday 26th March 2019  09:00 to 10:00
Cambridge University
3195
http://sms.cam.ac.uk/media/2947305
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  2
Luskin, M
Tuesday 26th March 2019  09:00 to 10:00
20190327T14:44:31+00:00
3195
2947305
true
16x9
false
no

Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  3
ucs_sms_2901231_2947380
http://sms.cam.ac.uk/media/2947380
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  3
Luskin, M
Tuesday 26th March 2019  16:00 to 17:00
Wed, 27 Mar 2019 14:54:43 +0000
Isaac Newton Institute
Luskin, M
ef3c432b949f51e6345bd81ba3f2b5b1
894e08b85ff207a84dbc666e6c36e447
4a37b13ee84297bef7bdcd8075f4c8f1
d91941cdff1283594764d4f015242c52
Luskin, M
Tuesday 26th March 2019  16:00 to 17:00
Luskin, M
Tuesday 26th March 2019  16:00 to 17:00
Cambridge University
3501
http://sms.cam.ac.uk/media/2947380
Mathematical Modeling and Numerical Analysis for Incommensurate 2D Materials  3
Luskin, M
Tuesday 26th March 2019  16:00 to 17:00
20190327T14:54:43+00:00
3501
2947380
true
16x9
false
no

Microstructure for continuous and localised intrinsic curvature creation
ucs_sms_2901231_2905262
http://sms.cam.ac.uk/media/2905262
Microstructure for continuous and localised intrinsic curvature creation
Warner, M
Friday 18th January 2019  11:45 to 12:30
Mon, 21 Jan 2019 08:58:14 +0000
Isaac Newton Institute
Warner, M
4f9abd1894e9d7716b417f042f7c32a0
d55103a3fcc28faba642670e24b36e45
6b8db7a10390910bb45b5433bbbf68f9
969046ebe85c715b3b817b7d0140801d
Warner, M
Friday 18th January 2019  11:45 to 12:30
Warner, M
Friday 18th January 2019  11:45 to 12:30
Cambridge University
2671
http://sms.cam.ac.uk/media/2905262
Microstructure for continuous and localised intrinsic curvature creation
Warner, M
Friday 18th January 2019  11:45 to 12:30
20190121T08:58:14+00:00
2671
2905262
true
16x9
false
no

Microstructures in modulated martensites – experimental observations and theoretical models
ucs_sms_2901231_2958721
http://sms.cam.ac.uk/media/2958721
Microstructures in modulated martensites – experimental observations and theoretical models
Seiner, H
11 March 2019
14.3015.30
Fri, 12 Apr 2019 12:20:43 +0100
Isaac Newton Institute
Seiner, H
9e5134b35740c27878008db618ed62d1
db5a8a00ef4aeb00eaed8998f0b82e24
0668f74d0b68426436627954ea6b55bf
58cf9259794fba8ae0753d688b6722a7
Seiner, H
11 March 2019
14.3015.30
Seiner, H
11 March 2019
14.3015.30
Cambridge University
3001
http://sms.cam.ac.uk/media/2958721
Microstructures in modulated martensites – experimental observations and theoretical models
Seiner, H
11 March 2019
14.3015.30
20190412T12:20:43+01:00
3001
2958721
true
16x9
false
no

Miha Ravnik University of Ljubljana, Jozef Stefan Institute Date: Wednesday 15th May 2019  11:10 to 11:50
ucs_sms_2901231_2985316
http://sms.cam.ac.uk/media/2985316
Miha Ravnik University of Ljubljana, Jozef Stefan Institute Date: Wednesday 15th May 2019  11:10 to 11:50
Ravnik, M
Wednesday 15th May 2019  11:10 to 11:50
Thu, 16 May 2019 13:05:17 +0100
Isaac Newton Institute
Ravnik, M
e3cb803cb66513648ff8e250c10adf2f
55641c67522b398474ddc9caa72af856
4a8880d8995d02aae40eccd7d9b320fb
ad57b9fdbaae9ffd2d38b6c3eac03987
Ravnik, M
Wednesday 15th May 2019  11:10 to 11:50
Ravnik, M
Wednesday 15th May 2019  11:10 to 11:50
Cambridge University
2568
http://sms.cam.ac.uk/media/2985316
Miha Ravnik University of Ljubljana, Jozef Stefan Institute Date: Wednesday 15th May 2019  11:10 to 11:50
Ravnik, M
Wednesday 15th May 2019  11:10 to 11:50
Complex –passive or active nematic fluids are characterised by internal orientational order, which upon tuning or frustration, can exhibit topological defects. The type of defects and their role naturally depend on dimensionality of the system, but importantly also on the geometry, confinement, flow, driving or even activity. Here, we present design of topological defects in passive and active nematic complex fluids – forming umbilic defects, singular loops, point defects and disclinations. Specifically, we show in passive nematics how confinement in the form of complex geometry and fractal surfaces can lead to formation of various defectbased nematic profiles, including exhibiting highelastic multipoles. In active nematics, we show defect profiles in threedimensional active nematic droplet, also highlighting the role of different surface coupling regimes.
20190516T13:05:17+01:00
2568
2985316
true
16x9
false
no

Modeling and analysis of chromonic liquid crystal condensates
ucs_sms_2901231_2984789
http://sms.cam.ac.uk/media/2984789
Modeling and analysis of chromonic liquid crystal condensates
Calderer, C
Tuesday 14th May 2019  11:50 to 12:30
Wed, 15 May 2019 16:06:17 +0100
Isaac Newton Institute
Calderer, C
2e3ff2b70ccb292174abe4810fe87c40
0da7f7f27bc59b7d22e255ffc278e400
c51d72e6a03db3087f4e806728690869
b3c0f4be11df3c3a6f9fda55843b6262
Calderer, C
Tuesday 14th May 2019  11:50 to 12:30
Calderer, C
Tuesday 14th May 2019  11:50 to 12:30
Cambridge University
2744
http://sms.cam.ac.uk/media/2984789
Modeling and analysis of chromonic liquid crystal condensates
Calderer, C
Tuesday 14th May 2019  11:50 to 12:30
The discovery of the liquid crystal phases of DNA and their study has attracted the attention of many scientists, for several decades. These include the contributions by soft matter physicists such as Professor F. Livolant, that began in the mid1970’s. On the other hand, the observation of clustering phenomena in lyotropic liquid crystals, analogous to that formed by DNA condensates and bacteriophage viral genome in a capsid domain, led John Lyndon to coin the chromonic denomination of the liquid crystals formed by planklike molecules (2013). All these liquid crystals are found to form hexagonal columnar chromonic phases, although they differ in order of magnitude by a factor of 106. This presentation addresses modeling and analysis of bacteriophage viruses, the toroidal structures formed by condensed DNA in free solutions, and the analogous phenomena observed in lyotropic chromonic liquid crystals phases of materials with planklike molecular shapes. Part of the presentation will focus on the experiments performed by ProfessorLavrentovich’s group on materials such as food dyessunset yellowand antiasthmatic drugs. A special feature determining the arrangement of DNA in a capsid is the dominant contribution of the elastic energy penalizing distortion of the cross sections perpendicular to the column axis. The central mathematical problem is formulated as a free boundary problem for the OseenFrank and Ericksen’s energies, where the domain and the vector (or tensor) field are unknown. The admissible set includes volume constraints as well as those expressing the high resistance of the chromonic structures to splay and twist deformation. The first part of the presentation will involve general geometries of the domain, resorting to earlier analyses of liquid crystal droplets. We will subsequently show that minimizers of the bending dominated constrained energy have toroidal shapes. Moreover, we will show that axisymmetric configurations lead to families of polyconvex energies for which minimization can be established by standard methods of calculus of variations. Moreover, in the case of bacteriophage viruses, we will identify the absolute minimizer as the coiling DNA configuration. We will conclude the presentation with the discussion of a numerical algorithm aimed at the design of viruses for applications to drug delivery and nanotransport.
20190515T16:06:17+01:00
2744
2984789
true
16x9
false
no

Modelling dislocation motion via discrete dislocation dynamics
ucs_sms_2901231_2958885
http://sms.cam.ac.uk/media/2958885
Modelling dislocation motion via discrete dislocation dynamics
Hudson, T
14 March 2019
14.3015.30
Fri, 12 Apr 2019 12:42:57 +0100
Isaac Newton Institute
Hudson, T
6341687305fc43a579737edc78b95b7e
b8e0e2d00c10ab17da3cc0700c806f3e
fee322c74e0f95b1bb4b8b3ca92cf5b6
a5f3014bb27b94f69a5e04a45acd4a09
Hudson, T
14 March 2019
14.3015.30
Hudson, T
14 March 2019
14.3015.30
Cambridge University
3459
http://sms.cam.ac.uk/media/2958885
Modelling dislocation motion via discrete dislocation dynamics
Hudson, T
14 March 2019
14.3015.30
20190412T12:42:57+01:00
3459
2958885
true
16x9
false
no

Morphing and shape control: some lessons from the motility of unicellular organisms
ucs_sms_2901231_2903732
http://sms.cam.ac.uk/media/2903732
Morphing and shape control: some lessons from the motility of unicellular organisms
DeSimone, A
Thursday 17th January 2019  09:00 to 09:45
Fri, 18 Jan 2019 15:56:42 +0000
Isaac Newton Institute
DeSimone, A
d777826d2cff02e33d7a51124571f893
a20d770e3099ddcd321085e7adc278a4
1f7c91c9f2cbf5387da3e7abe0f2f4c2
6d22b0f89ef2839ee723161bdf40740d
DeSimone, A
Thursday 17th January 2019  09:00 to 09:45
DeSimone, A
Thursday 17th January 2019  09:00 to 09:45
Cambridge University
2811
http://sms.cam.ac.uk/media/2903732
Morphing and shape control: some lessons from the motility of unicellular organisms
DeSimone, A
Thursday 17th January 2019  09:00 to 09:45
Locomotion strategies employed by unicellular organism are a rich source of inspiration for studying mechanisms for shape control. In fact, in an overwhelming majority of cases, biological locomotion can be described as the result of the body pushing against the world, by using shape change. Motion is then a result Newton’s third and second law: the world reacts with a force that can be exploited by the body as a propulsive force, which puts the body into motion following the laws of mechanics. Strategies employed by unicellular organisms are particularly interesting because they are invisible to the naked eye, and offer surprising new solutions to the question of how shape can be controlled.<br>
<br>
In recent years, we have studied locomotion and shape control in Euglena gracilis using a broad range of tools ranging from theoretical and computational mechanics, to experiment and observations at the microscope, to manufacturing of prototypes. This unicellular protist is particularly intriguing because it can adopt different motility strategies: swimming by flagellar propulsion, or crawling thanks to large amplitude shape changes of the whole body (a behavior known as metaboly). We will survey our most recent findings within this stream of research.<br>
<br>
References:<br>
<br>
1. Rossi, M., Cicconofri, G., Beran, A., Noselli, G., DeSimone, A.:<br>
Kinematics of flagellar swimming in Euglena gracilis: Helical trajectories and flagellar shapes.<br>
PNAS 2017<br>
<br>
2. <br>
Noselli, G., Beran, A., Arroyo, M., DeSimone, A.:<br>
Swimming Euglena respond to confinement with a behavioral change enabling effective crawling.<br>
Nature Physics (to appear, 2019)<br>
20190118T15:56:42+00:00
2811
2903732
true
16x9
false
no

Nematic Pattern Formation on 2D Polygons  a Landau de Gennes study
ucs_sms_2901231_2986210
http://sms.cam.ac.uk/media/2986210
Nematic Pattern Formation on 2D Polygons  a Landau de Gennes study
Majumdar, A
Thursday 16th May 2019  15:20 to 16:00
Fri, 17 May 2019 15:15:18 +0100
Isaac Newton Institute
Majumdar, A
56eb1b3c7a215b089536ef069acf0a60
ffbd5b5a4f68932e81352573aa368cee
8d34f07d57ec814435213d707fd4bf47
4ec46dbb82abbdf5ed4408bd619228cc
Majumdar, A
Thursday 16th May 2019  15:20 to 16:00
Majumdar, A
Thursday 16th May 2019  15:20 to 16:00
Cambridge University
2629
http://sms.cam.ac.uk/media/2986210
Nematic Pattern Formation on 2D Polygons  a Landau de Gennes study
Majumdar, A
Thursday 16th May 2019  15:20 to 16:00
20190517T15:15:18+01:00
2629
2986210
true
16x9
false
no

Odd elasticity in soft active solids
ucs_sms_2901231_2985363
http://sms.cam.ac.uk/media/2985363
Odd elasticity in soft active solids
Souslov, A
Tuesday 14th May 2019  15:20 to 16:00
Thu, 16 May 2019 13:11:26 +0100
Isaac Newton Institute
Souslov, A
ae25a9cc864909b11e6c4fcddf6fb3ff
9f5e4b31c086b7cc563453be6bec6fdf
9da76700e87f418f527bbc8df1307191
962afebb09eac7b68cb4f0926e3718a1
Souslov, A
Tuesday 14th May 2019  15:20 to 16:00
Souslov, A
Tuesday 14th May 2019  15:20 to 16:00
Cambridge University
2220
http://sms.cam.ac.uk/media/2985363
Odd elasticity in soft active solids
Souslov, A
Tuesday 14th May 2019  15:20 to 16:00
An active material is either a solid or a fluid in which microscopic constituents convert energy into motion. These microscopic engines can be organised to output collective macroscopic work. For active solids, we show that the theory of elasticity can be modified to describe this workextraction process. This talk focuses on the specific example of how an antisymmetric (or odd) component of the elastic tensor leads to the extraction (or injection) of work during quasistatic cycles of elastic deformations. Such materials can be designed based on active mechanical components that include sensors and actuators. Inside the material, workextraction cycles manifest themselves in signal propagation: in an overdamped active solid, elastic waves propagate via a balance between energy injection and dissipation. In addition, activity can be measured via static deformations, including activityinduced auxetic behaviour. This theory of odd elasticity suggests design principles for emergent autonomous materials in which work is locally injected, transported, and then extracted.
20190516T13:11:26+01:00
2220
2985363
true
16x9
false
no

On solutions to the eikonal equation with finite entropy production
ucs_sms_2901231_2980952
http://sms.cam.ac.uk/media/2980952
On solutions to the eikonal equation with finite entropy production
Lamy, X
Wednesday 8th May 2019  15:40 to 16:20
Thu, 09 May 2019 13:51:58 +0100
Isaac Newton Institute
Lamy, X
e2f5d48844925921c6b3418e183f7a03
5ea4c540e6a2ee3a0a68a176ec66e741
7a29800c1ca35534f60779c5d7f7fd8f
19545638bb7f020aa83bcdeff39a5475
Lamy, X
Wednesday 8th May 2019  15:40 to 16:20
Lamy, X
Wednesday 8th May 2019  15:40 to 16:20
Cambridge University
2649
http://sms.cam.ac.uk/media/2980952
On solutions to the eikonal equation with finite entropy production
Lamy, X
Wednesday 8th May 2019  15:40 to 16:20
Solutions with finite entropy productions arise in the sharp interface
limit of a gradient phase field model that was proposed by Aviles and
Giga as a simplified model for smectic liquid crystals, and is also
related to thin film elasticity, micromagnetics and pattern formation
models. I will present recent results on their regularity, based on
joint work with Francesco Ghiraldin.
20190509T13:51:58+01:00
2649
2980952
true
16x9
false
no

On the passage from nonlinear to linearized viscoelasticity
ucs_sms_2901231_2922823
http://sms.cam.ac.uk/media/2922823
On the passage from nonlinear to linearized viscoelasticity
Kruzik, M
Wednesday 13th February 2019  16:00 to 16:40
Mon, 18 Feb 2019 12:34:13 +0000
Isaac Newton Institute
Kruzik, M
9fdac73fc9b1aa68881c60c402892544
7de89dd2b23a5aafb9ec947d92a24c42
92bb7ec2e2245ebc547dc9b88a1dc33f
ebf6a305199ab21942d56663a07f9b13
Kruzik, M
Wednesday 13th February 2019  16:00 to 16:40
Kruzik, M
Wednesday 13th February 2019  16:00 to 16:40
Cambridge University
2405
http://sms.cam.ac.uk/media/2922823
On the passage from nonlinear to linearized viscoelasticity
Kruzik, M
Wednesday 13th February 2019  16:00 to 16:40
We formulate a quasistatic nonlinear model for nonsimple viscoelastic materials at a nitestrain setting in the Kelvin`sVoigt`s rheology where the viscosity stress tensor complies with the principle of timecontinuous frameindierence. We identify weak solutions in the nonlinear framework as limits of timeincremental problems for vanishing time increment. Moreover, we show that linearization around the identity leads to the standard system for linearized viscoelasticity and that solutions of the nonlinear system converge in a suitable sense to solutions of the linear one. The same property holds for timediscrete approximations and we provide a corresponding commutativity result. This is a joint work with M. Friedrich (Munster).
20190218T12:34:13+00:00
2405
2922823
true
16x9
false
no

Optimal transport theory meets the steel industry
ucs_sms_2901231_2958859
http://sms.cam.ac.uk/media/2958859
Optimal transport theory meets the steel industry
Bourne, D
14 March 2019
11.0012.00
Fri, 12 Apr 2019 12:39:44 +0100
Isaac Newton Institute
Bourne, D
2599cc3b3ae0962ac2f12d80f08e8d09
7c809f036fa4608b908f1e50e38be954
10f27e15faf220dd90990c01b144a76b
Bourne, D
14 March 2019
11.0012.00
Bourne, D
14 March 2019
11.0012.00
Cambridge University
3348
http://sms.cam.ac.uk/media/2958859
Optimal transport theory meets the steel industry
Bourne, D
14 March 2019
11.0012.00
20190412T12:39:45+01:00
3348
2958859
true
16x9
false
no

Orientational ordering and selforganisation of nanoparticles in liquid crystal and polymer nanocomposites
ucs_sms_2901231_2984811
http://sms.cam.ac.uk/media/2984811
Orientational ordering and selforganisation of nanoparticles in liquid crystal and polymer nanocomposites
Osipov, M
Tuesday 14th May 2019  16:40 to 17:00
Wed, 15 May 2019 16:01:01 +0100
Isaac Newton Institute
Osipov, M
1400e5b6568b73bc4fe8508234dbf7bc
47cea7061c1d9ab5ef6f448f6fccac5d
5c7545c023f1ef80d516ebdd43a800af
af770062dc6ff89b96e748dabd84619e
Osipov, M
Tuesday 14th May 2019  16:40 to 17:00
Osipov, M
Tuesday 14th May 2019  16:40 to 17:00
Cambridge University
1136
http://sms.cam.ac.uk/media/2984811
Orientational ordering and selforganisation of nanoparticles in liquid crystal and polymer nanocomposites
Osipov, M
Tuesday 14th May 2019  16:40 to 17:00
Nematic liquid crystals (LCs) and block copolymers doped with nanoparticles possess a number of interesting properties. In particular, anisotropic nanoparticles are orientationally ordered in the boundary region between the blocks [13] and a small concentration of nanoparticles can shift the transition temperatures between different phases, orientational ordering of nanoparticles is responsible for the enhanced dielectric anisotropy of the composite lamellae and hexagonal phases which opens a possibility to align block copolymers by external fields. This may enable one to solve various application problems. We first summarise the results of a molecular theory of nematic LCs doped with anisotropic nanoparticles and describe the effect of nanoparticles on the NI phase transition, the nematic order parameter and consider the formation of chains of polar nanoparticle [47]. We then present the results of a molecular theory of the induced orientational order of anisotropic nanoparticles in the lamellae and in the hexagonal phase of a diblock copolymer taking into anisotropic interaction between nanoparticles and the polymer chains. Numerical concentration and orientational order parameter profiles are presented for different values of the model parameters including the strength of the anisotropic interaction. We also present the results of the general meanfield theory which enables one to describe both the effect of segregation of monomers between different blocks on the orientational order of nanoparticles and the effect of nanoparticles on the stability of different phases.. Finally we present the results of the computer simulations of the lamellae and hexagonal copolymer nanocomposites doped with nanoparticles of different length and affinity, and the simulated concentration and order parameter profiles are compared with theoretical results [1,3]. We also discuss the corresponding phase diagrams which illustrate how the nanoparticles may effect the phase behaviour of block copolymers. References [1] Osipov, M. A., Gorkunov, M. V., Berezkin, A. V., Kudryavtsev, Y. V., Phys. Rev. E, 97, 042706 (2018) [2] M.A. Osipov and M.V. Gorkunov, Eur.Phys.J., 39, 126 (2016) [3] A.V. Berezkin, Y.V. Kudryavtsev, M.V. Gorkunov, and M.A. Osipov, J. Chem. Phys., 146, 144902 (2017) [4] M.V. Gorkunov and M.A. Osipov, Soft Matter, 7, 4348 (2011) [5] M.A. Osipov and M.V. Gorkunov, ChemPhys.Chem. 15, 1496 (2014) [6] M.A. Osipov and M.V. Gorkunov, Phys. Rev. E , 92, 032501 (2015) [7] Osipov, M. A. and Gorkounov, M. V. in Liquid Crystals with Nano and Microparticles. Lagerwall, J. P. F. and Scalia, G. (eds.). Singapore: World Scientific Publishing Company, 2016.
20190515T16:01:01+01:00
1136
2984811
true
16x9
false
no

Phase transformations in microstructure under extreme shear stress
ucs_sms_2901231_2958844
http://sms.cam.ac.uk/media/2958844
Phase transformations in microstructure under extreme shear stress
Ackland, G
13 March 2019
13.3014.30
Fri, 12 Apr 2019 12:37:41 +0100
Isaac Newton Institute
Ackland, G
8a29f24427b4aa10d7e9139948fab0fb
c95cc00f5cf12702b08972cb57b2e175
974c8c5f170693053ee44eaa4df4cacc
c5f6843c307f6c6983acc6b0e2f35844
Ackland, G
13 March 2019
13.3014.30
Ackland, G
13 March 2019
13.3014.30
Cambridge University
3600
http://sms.cam.ac.uk/media/2958844
Phase transformations in microstructure under extreme shear stress
Ackland, G
13 March 2019
13.3014.30
20190412T12:37:41+01:00
3600
2958844
true
16x9
false
no

Polar order in liquids
ucs_sms_2901231_2903801
http://sms.cam.ac.uk/media/2903801
Polar order in liquids
Mertelj, A
Friday 18th January 2019  11:00 to 11:45
Fri, 18 Jan 2019 16:22:02 +0000
Isaac Newton Institute
Mertelj, A
046780e783e7fb589c10f9f5c4f6efe6
a026296d087cbafed47d74e1505c2219
ca11d121c9e66236d54fdbd87f169cf0
d6bc0a92f0a0f062a8aa30c1ca93d158
Mertelj, A
Friday 18th January 2019  11:00 to 11:45
Mertelj, A
Friday 18th January 2019  11:00 to 11:45
Cambridge University
2686
http://sms.cam.ac.uk/media/2903801
Polar order in liquids
Mertelj, A
Friday 18th January 2019  11:00 to 11:45
Polar order, i.e., ferromagnetic or ferroelectric, in 3D liquids is experimentally rarely observed. In this talk I will discuss the reason for this and show two examples of how shape of constituents can promote polar order. The first example is a ferromagnetic liquid phase, which emerges in a suspension of magnetic nanoplatelets in isotropic solvent as a result of platelets’ shape. The second example is antiferroelectric splay nematic phase, which appears in materials made of wedgeshaped molecules with large electric dipole moments. CoAuthors: Darja Lisjak1, Patricija Hribar Boštjančič1, Borut Lampret1, Luka Cmok1, Žiga Gregorin1, Natan Osterman1, Nerea Sebastian1, Martin Čopič1, Joachim Kohlbrecher2, Juergen Klepp3, Richard J. Mandle4, Rachel R. Parker4, Adrian C. Whitwood4, John W. Goodby4 1J. Stefan Institute, Slovenia; 2PSI Villigen, Switzerland; 3University of Vienna, Austria; 4University of York, UK
20190118T16:22:02+00:00
2686
2903801
true
16x9
false
no

Pressuredriven active nematics systems: possible optimisation and design methods
ucs_sms_2901231_2903753
http://sms.cam.ac.uk/media/2903753
Pressuredriven active nematics systems: possible optimisation and design methods
Mottram, N
Thursday 17th January 2019  15:15 to 16:00
Fri, 18 Jan 2019 16:07:25 +0000
Isaac Newton Institute
Mottram, N
9c95977b5aac724fa96bafca8b7c09bf
832534c29821b31308d89612284ac3b1
cc6e0b2f01104d3ffdecd83fc312b5c5
1703170ce7ea9a1d40e6309febb43019
Mottram, N
Thursday 17th January 2019  15:15 to 16:00
Mottram, N
Thursday 17th January 2019  15:15 to 16:00
Cambridge University
2661
http://sms.cam.ac.uk/media/2903753
Pressuredriven active nematics systems: possible optimisation and design methods
Mottram, N
Thursday 17th January 2019  15:15 to 16:00
Active nematic fluids combine the flowmolecular orientation coupling phenomena seen in liquid crystals and the presence of internal energy generation that lead to spontaneous flow. These two effects combine to produce a fascinating noneqiuilibrium system, in which enhanced mixing, defect creation and anihilation and active turbulence have all been observed. In this presentation we will consider a relatively simple system  pressuredriven flow in a channel  in which multiple nontrivial equilibria can be found. The interaction between the strength of activity, the applied pressure gradient and other parameters such as boundary anchoring constraints will be explored, with the aim of allowing optimisation of, for instance, the observed fluid flux. Using similar methodologies to those commonly used in the design of liquid crystal display devices, we are able to affect the fluid flux of each possible stable state and to even change the number of possible equilibria. Coauthors: Dr Geoff McKay and Josh Walton (Strathclyde)
20190118T16:07:25+00:00
2661
2903753
true
16x9
false
no

Qtensor model of twistbend and splay nematic phases
ucs_sms_2901231_2984796
http://sms.cam.ac.uk/media/2984796
Qtensor model of twistbend and splay nematic phases
Copic, M
Tuesday 14th May 2019  16:00 to 16:40
Wed, 15 May 2019 16:07:06 +0100
Isaac Newton Institute
Copic, M
ae96434d5fb25f47242bcc696016f9a2
71d99521ee9d55a3641473dfcff52bf1
ac2b946ea0fdf91706e39304b73dfd7d
8990389d3d153cb3d234ac6a41dd1afb
Copic, M
Tuesday 14th May 2019  16:00 to 16:40
Copic, M
Tuesday 14th May 2019  16:00 to 16:40
Cambridge University
2422
http://sms.cam.ac.uk/media/2984796
Qtensor model of twistbend and splay nematic phases
Copic, M
Tuesday 14th May 2019  16:00 to 16:40
The twistbend nematic phase is characterized by a conically twisting director and by a dramatic softening of the bend elastic constant. The instability towards bend can theoretically also induce a splay bend phase with a bendsplay modulation along the director. Recently we found another modulated nematic phase where the splay elastic constant tends to zero, resulting in a splay modulation perpendicular to the director. These phases can be modeled by a single Qtensor free energy with a term that breaks the degeneracy between the splay and bend elastic constant and with a flexoelectric coupling of the divergence of the Qtensor with polarization.
Martin Čopič and Alenka Mertelj  Insitute J. Stephan, Ljubljana, Slovenia
20190515T16:07:06+01:00
2422
2984796
true
16x9
false
no

Realistic prediction of molecular organizations in thin organic films
ucs_sms_2901231_2903760
http://sms.cam.ac.uk/media/2903760
Realistic prediction of molecular organizations in thin organic films
Zannoni, C
Thursday 17th January 2019  16:15 to 17:00
Fri, 18 Jan 2019 16:13:01 +0000
Isaac Newton Institute
Zannoni, C
bb57cfa600e4cb96b9d6adbad766d722
7f71b5474a123268edb02a522d46944f
1594be5d1ec900b890649cab9d7e5bee
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Zannoni, C
Thursday 17th January 2019  16:15 to 17:00
Zannoni, C
Thursday 17th January 2019  16:15 to 17:00
Cambridge University
3260
http://sms.cam.ac.uk/media/2903760
Realistic prediction of molecular organizations in thin organic films
Zannoni, C
Thursday 17th January 2019  16:15 to 17:00
The molecular organization of organic semiconductors (OSC), and in particular of those that present liquid crystal (LC) phases [1], has a strong influence on charge and energy transport, particularly at interfaces [2]. Predicting realistic morphologies and molecular organizations from chemical structure is, however, far from easy and has only recently proved doable by atomistic molecular dynamics [35]. The issue is further complicated in thin films, where the material is strongly affected by surface interactions, even if obtaining information on alignment and anchoring is essential to optimize the specific interfacial orientations required for different applications (e.g. for Field Effect Transistors, rather than Organic Solar Cells). Here we show examples of the prediction of alignment and anchoring of organic functional materials (cyanobiphenyls in particular) at the interface with different substrates giving alignment parallel to the support surface e.g. for crystalline and glassy silica with different roughness [5] or polymers like PMMA or polystyrene [6]. We also show how hometropic orientations can be obtained coating the silica surface with suitable self assembled monolayers (SAM) of alkysilanes [7,8]. The importance of the film fabrication process on molecular alignment is also briefly discussed taking as an example the vapour deposition of sexithiophene (T6) on C60 [9] or pentacene on silica [10] While detailed atomistic simulations are on the way to providing reliable results for samples of the order of a few thousand molecules, going to significantly larger sizes comparable to those of real devices (e.g. 100nm thick) demands samples of the order of, say 106 molecules, which in turns requires giving up some details, using some form of coarse graining (CG). Ideally this CG procedure should provide reliable morphologies, albeit at molecular, rather than fully atomistic resolution, but also be capable of returning on demand the atomistic details needed for further charge transport calculations. Some examples will be presented of such a reversible CG approach based on modelling organic functional materials with collections of anisotropic GayBerne beads [11]. [1] H. Iino, T. Usui and JI. Hanna, Nature Comm. 6, 6828 (2015) [2] O.M. Roscioni, C. Zannoni, Molecular Dynamics Simulation and its Applications to ThinFilm Devices, in Unconventional Thin Film Photovoltaics, edited by E. Da Como, F. De Angelis, H. Snaith, A. B Walker, RSC (2016) [3] J. Idé, R. Méreau, L. Ducasse, F. Castet, H. Bock, Y. Olivier, J. Cornil, D. Beljonne, G. D’Avino, O. M. Roscioni, L. Muccioli, C. Zannoni, JACS, 136, 2911 (2014) [4] M. F. Palermo, L. Muccioli, C. Zannoni, PCCP, 17, 26149 (2015) [5] O. M. Roscioni, L. Muccioli, R. G. Della Valle, A. Pizzirusso, M. Ricci, C. Zannoni, Langmuir, 29, 8950 (2013). [6] M.F. Palermo, F. Bazzanini, L. Muccioli, C. Zannoni, Liq. Cryst. 44, 1764 (2017) [7] A. Mityashin, O.M. Roscioni, L. Muccioli, C. Zannoni, V. Geskin, J. Cornil, D. Janssen, S. Steudel, J. Genoe, P. Heremans, ACS Applied Materials & Interfaces, 17, 15372 (2014) [8] O. M. Roscioni, L. Muccioli, C. Zannoni, ACS Applied Materials & Interfaces 9, 11993 (2017). [9] G. D'Avino, L. Muccioli and C. Zannoni, Adv. Funct. Mater. 25, 1985 (2015). [10] O. M. Roscioni, G. D'Avino, L. Muccioli and C. Zannoni, J. Phys. Chem. Lett. 9, 6900 (2018). [11] M. Ricci, O. M. Roscioni, L Querciagrossa, C. Zannoni. to be published (2019)
20190118T16:13:01+00:00
3260
2903760
true
16x9
false
no

Recent progress in the geometric rigidity of thin domains
ucs_sms_2901231_2980959
http://sms.cam.ac.uk/media/2980959
Recent progress in the geometric rigidity of thin domains
Harutyunyan, D
Wednesday 8th May 2019  16:20 to 17:00
Thu, 09 May 2019 13:52:15 +0100
Isaac Newton Institute
Harutyunyan, D
afec276e2c1f76890510d49ce1abfe30
664ac54a315a26db0a9f2fd217e84703
47c91b986e75680edf21d6e61a899d61
8be9a5518b48c8f6a8ac18576ee575f2
Harutyunyan, D
Wednesday 8th May 2019  16:20 to 17:00
Harutyunyan, D
Wednesday 8th May 2019  16:20 to 17:00
Cambridge University
2175
http://sms.cam.ac.uk/media/2980959
Recent progress in the geometric rigidity of thin domains
Harutyunyan, D
Wednesday 8th May 2019  16:20 to 17:00
We will discuss the celebrated geometric rigidity estimate of Friesecke,
James and Mueller. While It is known to be asymptotically sharp for plates in
the thickness vanishing limit, the question for general thin domains is still open.
We will discuss the analogous Korn inequality (the linear version of the rigidity
estimate) and the resolution of it for vector fields under Dirichlet boundary
condition on the domain thin face. We will also present the so called novel Korn
and Geometric Rigidity interpolation inequalities, which solve the question of
best constant in Korn’s second inequality in thin domains; the last had been
unknown since 1908. This is partially joint work with Yury Grabovsky.
20190509T13:52:15+01:00
2175
2980959
true
16x9
false
no

Reconfigurable surfaces with controlled stretching and shearing: from biological templates to engineering devices
ucs_sms_2901231_2986233
http://sms.cam.ac.uk/media/2986233
Reconfigurable surfaces with controlled stretching and shearing: from biological templates to engineering devices
DeSimone, A
Friday 17th May 2019  09:40 to 10:20
Fri, 17 May 2019 15:19:24 +0100
Isaac Newton Institute
DeSimone, A
20449fb74ffc46279308e7b5c1e6c72d
4366d5909862e1bb4c708fc4296fa32c
f9c76f755895800066e86dd38c94f5fa
73214af8f34f2bebd3283ff20fbc8fb5
DeSimone, A
Friday 17th May 2019  09:40 to 10:20
DeSimone, A
Friday 17th May 2019  09:40 to 10:20
Cambridge University
2580
http://sms.cam.ac.uk/media/2986233
Reconfigurable surfaces with controlled stretching and shearing: from biological templates to engineering devices
DeSimone, A
Friday 17th May 2019  09:40 to 10:20
In recent years, we have studied locomotion and shape control in Euglena gracilis using a broad range of tools ranging from theoretical and computational mechanics, to experiment and observations at the microscope, to manufacturing of prototypes. As a concrete example, the behavior of Euglena gracilis is particularly interesting.This unicellular protist is particularly intriguing because it can adopt different motility strategies: swimming by flagellar propulsion, or crawling thanks to large amplitude shape changes of the whole body (a behavior known as metaboly). We will survey our most recent findings [14] within this stream of research. This is joint work with M. Arroyo, G. Cicconofri, A. Lucantonio, and G. Noselli, and is supported by ERC Advanced Grant 340685MicroMotility. References [1] Rossi, M., Cicconofri, G., Beran, A., Noselli, G., DeSimone, A.: “Kinematics of flagellar swimming in Euglena gracilis: Helical trajectories and flagellar shapes”, Proceedings of the National Academy of Sciences USA 114(50), 1308513090 (2017). [2] Noselli, G., Beran, A., Arroyo, M., DeSimone, A.: “Swimming Euglena respond to confinement with a behavioral change enabling effective crawling”, Nature Physics, 2019. [3] Noselli, G., Arroyo, M., DeSimone, A.: “Smart helical structures inspired by the pellicles of euglenids”, J. Mech Phys Solids 123, 234246 (2019). [4] Caruso, N., Cvetkovic, A., Lucantonio, A., Noselli, G., DeSimone, A.: “Spontaneous morphing of equibiaxially prestretched elastic bilayers: The role of sample geometry”, Int J Mech Sci 149, 481486 (2018).
20190517T15:19:25+01:00
2580
2986233
true
16x9
false
no

Remarks on polycrystalline microstructure
ucs_sms_2901231_2903787
http://sms.cam.ac.uk/media/2903787
Remarks on polycrystalline microstructure
Ball, J
Friday 18th January 2019  09:00 to 09:45
Fri, 18 Jan 2019 16:09:15 +0000
Isaac Newton Institute
Ball, J
3581146ae2888c3f15cd1c6c3241b3eb
a497f990f038977de97b31e9af6d3995
4c625f440c6536b33b669d3363ca4435
aa1a74eeeb5cc1ca1915ffdea81954f8
Ball, J
Friday 18th January 2019  09:00 to 09:45
Ball, J
Friday 18th January 2019  09:00 to 09:45
Cambridge University
2682
http://sms.cam.ac.uk/media/2903787
Remarks on polycrystalline microstructure
Ball, J
Friday 18th January 2019  09:00 to 09:45
The talk will discuss some questions related to the understanding of microstructures arising from martensitic phase transformations, and the role of compatibility across grain boundaries, drawing on joint work with Carsten Carstensen (Humboldt University, Berlin).
20190118T16:09:15+00:00
2682
2903787
true
16x9
false
no

Reverse Engineering of Design Principles using Biased Dynamics
ucs_sms_2901231_2902463
http://sms.cam.ac.uk/media/2902463
Reverse Engineering of Design Principles using Biased Dynamics
Cates, M
Tuesday 15th January 2019  17:00 to 18:00
Wed, 16 Jan 2019 14:48:48 +0000
Isaac Newton Institute
Cates, M
e5de8ce9f964217f7c4cfbae3d390898
d474b30785385156ef70a8cda9692508
0dec0652f27f0ee1145ff1e6b35cd6e0
007a18f0acdd1a133f30e220a1190983
Cates, M
Tuesday 15th January 2019  17:00 to 18:00
Cates, M
Tuesday 15th January 2019  17:00 to 18:00
Cambridge University
2920
http://sms.cam.ac.uk/media/2902463
Reverse Engineering of Design Principles using Biased Dynamics
Cates, M
Tuesday 15th January 2019  17:00 to 18:00
Suppose we want to create a material with a certain unusual property. One strategy is to start with a model of an existing material without that property, and bias its dynamics to sample unlikely trajectories for which the atypical property is pres ent. Looking at the biased trajectories, it may be possible to spot some choice of local interactions that would achieve the required effect. I will describe an instance of this in the realm of selfpropelled spherical colloids. Here, biasing the ensemble to reduce colloidal collisions creates states in which the propulsion directions have polar order: accordingly, collisions can be reduced by introducing polar interactions. While this particular outcome is relatively obvious, the method is generalizable in principle to more complex cases where genuinely new design principles might emerge. Coauthors: Takahiro Nemoto, Étienne Fodor, Robert L. Jack, Julien Tailleur Reference: Optimizing active work: dynamical phase transitions, collective motion and jamming. T. Nemoto et al, arXiv 1805.02887
20190116T14:48:48+00:00
2920
2902463
true
16x9
false
no

Rothschild Distinguished Visiting Fellow Lecture: Metamaterials: composite materials with striking properties
ucs_sms_2901231_2996696
http://sms.cam.ac.uk/media/2996696
Rothschild Distinguished Visiting Fellow Lecture: Metamaterials: composite materials with striking properties
Milton, G
Monday 3rd June 2019  16:00 to 17:00
Tue, 04 Jun 2019 09:28:55 +0100
Isaac Newton Institute
Milton, G
c2ccaef3b85748aaae8bc348ef5821d2
ce8f671ad79526c05a96a56386b31d09
822a72d87cc7ced87d2ef71ae3043704
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Milton, G
Monday 3rd June 2019  16:00 to 17:00
Milton, G
Monday 3rd June 2019  16:00 to 17:00
Cambridge University
3585
http://sms.cam.ac.uk/media/2996696
Rothschild Distinguished Visiting Fellow Lecture: Metamaterials: composite materials with striking properties
Milton, G
Monday 3rd June 2019  16:00 to 17:00
Sometimes the properties of a composite are completely unlike those of the constituent materials, even when the structure is small compared to the wavelength: these composites are called metamaterials. Classic examples include bubbly fluids and stained glass windows made from suspensions of metal particles in glass. Other examples include metamaterials with negative thermal expansion made from materials all having positive thermal expansion; metamaterials with negative and/or possibly anisotropic mass density over a range of frequencies; metamaterials that get fatter as they are stretched (having a negative Poisson's ratio); materials with artificial and possibly negative magnetic permeability. The list goes on. Recent attention has been directed to spacetime microstructures where the material moduli vary in both space and time. We will review some of the progress that has been made. One particular class of elastic metamaterials, known as pentamodes, has proved useful for guiding stress. Cable networks can also guide stress. It turns out that essentially any cable network under tension, and supporting a given loading, can be replaced by one in which at most four cables meet at any junction. Like pentamodes, these can support, up to a constant factor, only one stress field. Thus by tightening just one cable one gets the desired forces at all the terminal nodes. This last work is joint with Guy Bouchitte, Ornella Mattei and Pierre Seppecher.
20190604T09:28:55+01:00
3585
2996696
true
16x9
false
no

Selfassembly of liquid crystal mixtures: cubic fluid cylinders, elastic emulsions and colloidactive gels composites
ucs_sms_2901231_2985323
http://sms.cam.ac.uk/media/2985323
Selfassembly of liquid crystal mixtures: cubic fluid cylinders, elastic emulsions and colloidactive gels composites
Marenduzzo, D
Wednesday 15th May 2019  11:50 to 12:30
Thu, 16 May 2019 13:06:59 +0100
Isaac Newton Institute
Marenduzzo, D
08462dcea0ffebaca7939903a4563ba6
401cf40a0f38cde47a6c05aee58b156c
5f3f49be2724d4d5f670089335252de3
a8d59850c01fdad5531388680b5326bc
Marenduzzo, D
Wednesday 15th May 2019  11:50 to 12:30
Marenduzzo, D
Wednesday 15th May 2019  11:50 to 12:30
Cambridge University
2401
http://sms.cam.ac.uk/media/2985323
Selfassembly of liquid crystal mixtures: cubic fluid cylinders, elastic emulsions and colloidactive gels composites
Marenduzzo, D
Wednesday 15th May 2019  11:50 to 12:30
In this talk we will show results from lattice Boltzmann simulations probing the behaviour of soft matter mixtures based on a liquid crystalline host (which can be either passive or active). In the first part of the talk we will investigate the behaviour of a phaseseparating mixture of a blue phase I liquid crystal with an isotropic fluid. The resulting morphology is primarily controlled by an inverse capillary number, setting the balance between interfacial and elastic forces. When this dimensionless number and the concentration of the isotropic component are both low, the blue phase disclination lattice templates a novel cubic array of fluid cylinders. In different regions of parameter space, we find elastic emulsions which coarsen very slowly, rewiring the blue phase disclination lines as they do so. In the second part of the talk, we will study the dynamics of a dispersion of passive colloidal particles in an active nematic host. We find that activity induces a dynamic clustering of colloids even in the absence of any preferential anchoring of the active nematic director at the particle surface. When such an anchoring is present, active stresses instead compete with elastic forces and redisperse the aggregates observed in passive colloidliquid crystal composites.
20190516T13:06:59+01:00
2401
2985323
true
16x9
false
no

Selforganization of patchy colloidal particles: 2 & 3D
ucs_sms_2901231_2984086
http://sms.cam.ac.uk/media/2984086
Selforganization of patchy colloidal particles: 2 & 3D
Telo da Gama, M
Monday 13th May 2019  11:10 to 11:50
Tue, 14 May 2019 13:21:49 +0100
Isaac Newton Institute
Telo da Gama, M
8acaa7c5457095d5a2e948e1a85fed5b
fc9d10bf477485d4fb3a7b8d1a5349fa
329b5d7f6b7e19597989fa5730aa7c43
ff5162b3d31c662b878111405d8d9996
Telo da Gama, M
Monday 13th May 2019  11:10 to 11:50
Telo da Gama, M
Monday 13th May 2019  11:10 to 11:50
Cambridge University
2677
http://sms.cam.ac.uk/media/2984086
Selforganization of patchy colloidal particles: 2 & 3D
Telo da Gama, M
Monday 13th May 2019  11:10 to 11:50
We investigate the selforganization of patchy colloidal particles deposited on flat substrates in three (2+1) and two (1+1) spatial dimensions. We propose and use a simple stochastic model for the interaction between the particles, which allows the simulation of very large systems, to probe the long time and largescale structure of the deposited films. The latter exhibit well defined surface, liquid and interfacial regions except when the growth is dominated by the formation of chains, which occurs for systems with an effective valence close to two. We also investigate the interfacial roughening in (1+1) systems and compare our results with those obtained experimentally for evaporating droplets. We find, in line with the experiments, that when the film growth is dominated by chains the generic KardarParisiZhang (KPZ) interfacial roughening is replaced by quenched KPZ. We discuss this somewhat surprising result.
20190514T13:21:49+01:00
2677
2984086
true
16x9
false
no

Soft Skyrmions and Programmable SelfAssembly of Superlattices
ucs_sms_2901231_2984123
http://sms.cam.ac.uk/media/2984123
Soft Skyrmions and Programmable SelfAssembly of Superlattices
Travesset, A
Monday 13th May 2019  16:00 to 16:40
Tue, 14 May 2019 13:30:30 +0100
Isaac Newton Institute
Travesset, A
c013202eb44bcfd2d57bb03f7690ef2f
2cf47574c8376af3566a82216392e604
15b7861332c6d8fbc242c5acd14c8bab
8e6bde372d64c8e97751db2c0d422c3a
Travesset, A
Monday 13th May 2019  16:00 to 16:40
Travesset, A
Monday 13th May 2019  16:00 to 16:40
Cambridge University
2486
http://sms.cam.ac.uk/media/2984123
Soft Skyrmions and Programmable SelfAssembly of Superlattices
Travesset, A
Monday 13th May 2019  16:00 to 16:40
Materials whose fundamental units are nanocrystals (NC)s, instead of atoms or molecules, are gradually emerging as major candidates to solve many of the technological challenges of our century. Those materials display unique structural, dynamical and thermodynamical properties, often reflecting deep underlying geometric, packing and topological constraints. In this talk, I will discuss the rational design of NC materials by programmable selfassembly. I will present the Orbifold Topological Model (OTM), which successfully describes the structure of crystal or quasicrystal arrangements of NCs (superlattices) by considering capping ligands as Skyrmion textures, which determine the bonding very much like atomic orbitals in lattices of simple atoms. I will show that the OTM describes “atomic orbitals” as consisting of vortices, which enable the generation of a spontaneous valence and reveal the universal tendency of these systems towards icosahedral order, allowing to describe them as quasiFrankKasper phases. These results will be confirmed by numerical simulations. I will elaborate on the success of the OTM in describing all existing experimental structural data on single component and binary superlattices obtained by solvent evaporation and present new candidate phases.
20190514T13:30:30+01:00
2486
2984123
true
16x9
false
no

Some remarks on mathematical theories of liquid crystals
ucs_sms_2901231_2986196
http://sms.cam.ac.uk/media/2986196
Some remarks on mathematical theories of liquid crystals
Ball, J
Thursday 16th May 2019  11:50 to 12:30
Fri, 17 May 2019 15:08:17 +0100
Isaac Newton Institute
Ball, J
90ded7ead31067102e578ae66c249b82
fb269a1c8a5d32ea69559bae00ab3a4f
7d2729f2f425daa5974bd7a1eed32632
b9fab2abd6e5da5e2269321b60965e66
Ball, J
Thursday 16th May 2019  11:50 to 12:30
Ball, J
Thursday 16th May 2019  11:50 to 12:30
Cambridge University
1770
http://sms.cam.ac.uk/media/2986196
Some remarks on mathematical theories of liquid crystals
Ball, J
Thursday 16th May 2019  11:50 to 12:30
The talk will concern two different topics. First a quick new proof will be given of a result of Fatkullin & Slastikov (2005), Liu, Zhang & Zhang (2005) (see also Zhou et al (2005)), to the effect that stationary solutions to the Onsager equation with the MaierSaupe interaction are radially symmetric. Second, a description will be given of joint work with Lu Liu on exterior problems in the 2D oneconstant OseenFrank theory.
20190517T15:08:17+01:00
1770
2986196
true
16x9
false
no

Supercompatibility and the direct conversion of heat to electricity  1
ucs_sms_2901231_2948948
http://sms.cam.ac.uk/media/2948948
Supercompatibility and the direct conversion of heat to electricity  1
James, R
Thursday 28th March 2019  09:00 to 10:00
Fri, 29 Mar 2019 12:16:37 +0000
Isaac Newton Institute
James, R
1c6d0347864c6cba0765bce6ba28dfa0
1782b4f226a4ef36fecb830bb048e6b2
bd4221c350fb7886b71c2b4852a3939c
78b4ba08f3c2aee4f327e078717569b2
James, R
Thursday 28th March 2019  09:00 to 10:00
James, R
Thursday 28th March 2019  09:00 to 10:00
Cambridge University
3541
http://sms.cam.ac.uk/media/2948948
Supercompatibility and the direct conversion of heat to electricity  1
James, R
Thursday 28th March 2019  09:00 to 10:00
20190329T12:16:37+00:00
3541
2948948
true
16x9
false
no

Supercompatibility and the direct conversion of heat to electricity  2
ucs_sms_2901231_2948957
http://sms.cam.ac.uk/media/2948957
Supercompatibility and the direct conversion of heat to electricity  2
James, R
Thursday 28th March 2019  10:15 to 11:15
Fri, 29 Mar 2019 12:21:58 +0000
Isaac Newton Institute
James, R
13f2eaada0032c58a959ee13d59ebfab
e74855ac1426056668893291eff6ef17
b3907a58cade49bf2708f7eb604d4b69
2c4417e44cf615890b91b4772c6d9883
James, R
Thursday 28th March 2019  10:15 to 11:15
James, R
Thursday 28th March 2019  10:15 to 11:15
Cambridge University
3451
http://sms.cam.ac.uk/media/2948957
Supercompatibility and the direct conversion of heat to electricity  2
James, R
Thursday 28th March 2019  10:15 to 11:15
20190329T12:21:58+00:00
3451
2948957
true
16x9
false
no

Supercompatibility and the direct conversion of heat to electricity  3
ucs_sms_2901231_2948974
http://sms.cam.ac.uk/media/2948974
Supercompatibility and the direct conversion of heat to electricity  3
James, R
Thursday 28th March 2019  13:30 to 14:30
Fri, 29 Mar 2019 12:30:09 +0000
Isaac Newton Institute
James, R
81f7dab56b033ec20f89f2d8ce87d83d
e6d8159e197aed6c5ac2f188655ff0f9
72a91a7b25a8d31b1346084e98743ebb
213c1fbfcf149b0ef8a81acb08172bda
James, R
Thursday 28th March 2019  13:30 to 14:30
James, R
Thursday 28th March 2019  13:30 to 14:30
Cambridge University
3960
http://sms.cam.ac.uk/media/2948974
Supercompatibility and the direct conversion of heat to electricity  3
James, R
Thursday 28th March 2019  13:30 to 14:30
20190329T12:30:09+00:00
3960
2948974
true
16x9
false
no

Supercompatibility and the direct conversion of heat to electricity  4
ucs_sms_2901231_2948996
http://sms.cam.ac.uk/media/2948996
Supercompatibility and the direct conversion of heat to electricity  4
James, R
Friday 29th March 2019  09:00 to 10:00
Fri, 29 Mar 2019 12:30:21 +0000
Isaac Newton Institute
James, R
c3408e30a6e8dc83afcc36b67b31899b
f14e0ad11495ee09c9804cfdaab3f640
1d427c7f43e7ffb3819eadaa4879b7d1
1c7ef6698df4cb4b46463ca82d9e43f7
James, R
Friday 29th March 2019  09:00 to 10:00
James, R
Friday 29th March 2019  09:00 to 10:00
Cambridge University
3573
http://sms.cam.ac.uk/media/2948996
Supercompatibility and the direct conversion of heat to electricity  4
James, R
Friday 29th March 2019  09:00 to 10:00
20190329T12:30:21+00:00
3573
2948996
true
16x9
false
no

Symmetry in materials science models under the divergence constraint
ucs_sms_2901231_2903739
http://sms.cam.ac.uk/media/2903739
Symmetry in materials science models under the divergence constraint
Ignat, R
Thursday 17th January 2019  11:00 to 11:45
Fri, 18 Jan 2019 16:03:05 +0000
Isaac Newton Institute
Ignat, R
e0638dadf8be693bf47e66d02c10784c
f8c80bdb8151b51277b8bac73b8f4a81
358c42e1b73f5a2e8cd422b6e3297f94
1b9bac006bcbcfa5bbd9a30c6d6c31e2
Ignat, R
Thursday 17th January 2019  11:00 to 11:45
Ignat, R
Thursday 17th January 2019  11:00 to 11:45
Cambridge University
2941
http://sms.cam.ac.uk/media/2903739
Symmetry in materials science models under the divergence constraint
Ignat, R
Thursday 17th January 2019  11:00 to 11:45
The symmetry of the order parameter is one of the most important features in materials science. In this talk we will focus on the onedimensional symmetry of transition layers u in some variational models (such as smectic liquid crystals, thin film blisters, micromagnetics...) where the divergence div(u) vanishes. Namely, we determine a class of nonlinear potentials such that the minimal transition layers are onedimensional symmetric. In particular, this class includes in dimension N=2 the nonlinearities w^2 with w being an harmonic function or a solution to the wave equation, while in dimensions N>2, this class contains a perturbation of the standard GinzburgLandau potential as well as potentials having N+1 wells with prescribed transition cost between the wells. For that, we develop a theory of calibrations for divergencefree maps in R^N (similar to the theory of entropies for the AvilesGiga model when N=2). This is a joint work with Antonin Monteil (Louvain, Belgium).
20190118T16:03:05+00:00
2941
2903739
true
16x9
false
no

The bending energy of buckled edgedislocations
ucs_sms_2901231_2958872
http://sms.cam.ac.uk/media/2958872
The bending energy of buckled edgedislocations
Kupferman, R
14 March 2019
13.3014.30
Fri, 12 Apr 2019 12:41:30 +0100
Isaac Newton Institute
Kupferman, R
f1eec6fc8807454866b65c443da53b71
09a8bea9ef46ccd3b30f05849775d5ba
a856155791a3d6c069b05ad62889bb95
f57b4a7cd48ad231d590d39ce5d41423
Kupferman, R
14 March 2019
13.3014.30
Kupferman, R
14 March 2019
13.3014.30
Cambridge University
3329
http://sms.cam.ac.uk/media/2958872
The bending energy of buckled edgedislocations
Kupferman, R
14 March 2019
13.3014.30
20190412T12:41:30+01:00
3329
2958872
true
16x9
false
no

Thermally actuated portable microvalves using elastomeric focusing
ucs_sms_2901231_2984148
http://sms.cam.ac.uk/media/2984148
Thermally actuated portable microvalves using elastomeric focusing
Sinha, S
Monday 13th May 2019  16:40 to 17:00
Tue, 14 May 2019 13:30:50 +0100
Isaac Newton Institute
Sinha, S
f1e05616b7b5d32c1d6179edd050122b
44251f060408ba49285f97e00929b97b
41186d8c9dfa985885ba674cfe230daa
e385d726a9bd723f699557b8bb8a64bc
Sinha, S
Monday 13th May 2019  16:40 to 17:00
Sinha, S
Monday 13th May 2019  16:40 to 17:00
Cambridge University
909
http://sms.cam.ac.uk/media/2984148
Thermally actuated portable microvalves using elastomeric focusing
Sinha, S
Monday 13th May 2019  16:40 to 17:00
Thermally actuated controlled shape changes in soft materials is a challenge as the material shows nonlinear expansion characteristics. CTE of many materials is not properly available. In order to focus the expansion of the soft solid into large displacements a confined geometry is created to amplify the shape changes. Here we use an elastomer (PDMS sheet) confined between two rigid layers, which when locally heated using resistive heating expands into the micromolded channels, resulting into a massive relative displacement compared to the case of an unconfined geometry. This principle is used to make microfluidic valves which are electrically controlled (using a 3.3V5V cellphone battery) and close in less than 100 ms. They operate within a power range of 140160 mW generated by the specifically designed resistive heating element (inhouse made ink) screen printed on the chip. We investigate the parameters of the heating element design, height dimensions and flow conditions through the valves. This technique helps us to make multiple valves along the fluidic pathway with arbitrary positioning. The size of these really help to make the devices portable as one does not need a separate controller for the actuating the valves.
20190514T13:30:50+01:00
909
2984148
true
16x9
false
no

TiNiCu and TiNiCuCo thin films for elastocaloric cooling
ucs_sms_2901231_2958736
http://sms.cam.ac.uk/media/2958736
TiNiCu and TiNiCuCo thin films for elastocaloric cooling
Quandt, E
12 March 2019
09.3010.30
Fri, 12 Apr 2019 12:22:44 +0100
Isaac Newton Institute
Quandt, E
0ef30305a41f940d13502efe0411c0b8
2d88821726205e75cb6e2ee6841903ec
dadd7158475cdbd1f12ec7e9faa87745
af7ef8f23627d3a5f913bf7af1d8487e
Quandt, E
12 March 2019
09.3010.30
Quandt, E
12 March 2019
09.3010.30
Cambridge University
3091
http://sms.cam.ac.uk/media/2958736
TiNiCu and TiNiCuCo thin films for elastocaloric cooling
Quandt, E
12 March 2019
09.3010.30
20190412T12:23:15+01:00
3091
2958736
true
16x9
false
no

Virial inversion and microscopic derivation of density functionals
ucs_sms_2901231_3009035
http://sms.cam.ac.uk/media/3009035
Virial inversion and microscopic derivation of density functionals
Tsagkarogiannis, D
Wednesday 19th June 2019  14:30 to 15:10
Wed, 26 Jun 2019 14:25:58 +0100
Isaac Newton Institute
Tsagkarogiannis, D
0a3bd52b4423e364ef2e012d1b31e409
ee8280e36eb557126fb911d5dfc49d94
4755dc72bf81bc6746b497e464a4a29a
01fb7d3cb2b7e8831bb550336478d58b
Tsagkarogiannis, D
Wednesday 19th June 2019  14:30 to 15:10
Tsagkarogiannis, D
Wednesday 19th June 2019  14:30 to 15:10
Cambridge University
2651
http://sms.cam.ac.uk/media/3009035
Virial inversion and microscopic derivation of density functionals
Tsagkarogiannis, D
Wednesday 19th June 2019  14:30 to 15:10
We present a rigorous derivation of the free energy functional for
inhomogeneous systems, i.e. with a density that depends on the position,
orientation or other internal degrees of freedom. It can be viewed as an
extension of the virial inversion (developed for homogeneous systems) to
uncountably many species. The key technical tool is a combinatorial identity for
a special type of trees which allows us to implement the inversion step as well
as to prove its convergence. Applications include classical density functional
theory, Onsager's functional for liquid crystals, hard spheres of different sizes
and shapes. Furthermore, the method can be generalized in order to provide
convergence for other expansions commonly used in the liquid state theory.
The validity is always in the gas regime, but with the new method we improve
the original radius of convergence for the hard spheres as proved by Lebowitz
and Penrose and subsequent works. This is joint work with Sabine Jansen and
Tobias Kuna.
20190626T14:25:58+01:00
2651
3009035
true
16x9
false
no

Wrinkles, spaghetti & knots
ucs_sms_2901231_3009069
http://sms.cam.ac.uk/media/3009069
Wrinkles, spaghetti & knots
Dunkel, J
Wednesday 19th June 2019  15:50 to 16:10
Wed, 26 Jun 2019 14:18:37 +0100
Isaac Newton Institute
Dunkel, J
adf1f5690ac24143c0f3c80cf34d4ca2
733bfc88d01da5a9ea18e8e6185c3860
8e27784a4cad641eca4955d174f6aa13
896df370d140987022445a858af56aa6
Dunkel, J
Wednesday 19th June 2019  15:50 to 16:10
Dunkel, J
Wednesday 19th June 2019  15:50 to 16:10
Cambridge University
2884
http://sms.cam.ac.uk/media/3009069
Wrinkles, spaghetti & knots
Dunkel, J
Wednesday 19th June 2019  15:50 to 16:10
Buckling, twisting and fracture are ubiquitous phenomena that, despite
having been studied for centuries, still pose many interesting conceptual and
practical challenges. In this talk, I will summarize our recent theoretical and
experimental work that aims to understand the role of curvature and torsion
in wrinkle pattern selection, fragmentation cascades and knots. First, we will
show how changes in curvature can induce phase transitions and topological
defects in the wrinkling patterns on curved elastic surfaces. Thereafter, we will
revisit an observation by Feynman who noted that dry spaghetti appears to
fragment into at least three (but hardly ever two) pieces when placed under
large bending stresses. Using a combination of experiments, simulations and
analytical scaling arguments, we will demonstrate how twist can be used to
control binary fracture of brittle elastic rods. Finally, in the last part, we will try to
shed some light on how topology and torsion affect the stability of commonly
used knots.
20190626T14:18:37+01:00
2884
3009069
true
16x9
false
no
2901231