Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session A02: Geometry and Topology in Soft Condensed Matter Physics |
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Chair: Yohannes Abate, University of Georgia Room: Holiday Inn Resort Airlie/Tidewater |
Thursday, November 7, 2019 8:30AM - 9:00AM |
A02.00001: Morphing hard and soft matter by reaction-transport dynamics Invited Speaker: Nadir Kaplan Engineering next-generation materials that can grow into efficient multitasking agents, move rapidly, or discern environmental cues greatly benefits from inspiration from biological systems. In the first part of my talk, I will present a geometrical theory that explains the biomineralization-inspired growth and form of carbonate-silica microarchitectures in a dynamic reaction-diffusion system. The theory predicts new self-assembly pathways of intricate morphologies and thereby guides the synthesis of light-guiding optical structures. The second part is dedicated to a soft matter analog of controlled actuation and complex sensing in living systems. Specifically, I will introduce a continuum framework of a simple hydrogel system that is activated upon transport and reaction of chemical stimuli. The hydrogel exhibits unique cascades of mechanical and optical responses, suggesting that common gels have a much larger sensing space than currently employed. The theoretical work presented here is intimately connected to modern materials science. The effective convergence of theory and experiment paves the way for optimized hard or soft biomimetic materials for applications ranging from bottom-up manufacturing to soft robotics. [Preview Abstract] |
Thursday, November 7, 2019 9:00AM - 9:30AM |
A02.00002: Physical aging in systems with glassy-like dynamics: from vortex matter to skyrmion systems Invited Speaker: Michel Pleimling This talk focuses on physical aging in two types of systems with slow, glassy-like dynamics: interacting magnetic flux lines in type-II superconductors [1,2] and interacting skyrmion matter [3,4]. In a previously equilibrated system, either the temperature is suddenly changed or the magnetic field is instantaneously altered. The subsequent aging properties are investigated in samples with various types of defects, which allows to distinguish the complex relaxation features that result from the different types of pinning. Two-time correlation functions are analyzed to study the non-linear stochastic relaxation dynamics in the aging regime.\\[0.3cm] [1] H. Assi, H. Chaturvedi, U. Dobramysl, M. Pleimling, and U. C. T\"{a}uber, Phys. Rev. E 92, 052124 (2015)\\[0cm] [2] H. Chaturvedi, N. Galliher, U. Dobramysl, M. Pleimling, and U. C. T\"{a}uber, Eur. Phys. J. B. 91, 294 (2018)\\[0cm] [3] B. L. Brown, U. C. T\"{a}uber, and M. Pleimling, Phys. Rev. B 97, 020405(R) (2018)\\[0cm] [4] B. L. Brown, U. C. T\"{a}uber, and M. Pleimling, Phys. Rev. B 100, 024410 (2019) [Preview Abstract] |
Thursday, November 7, 2019 9:30AM - 10:00AM |
A02.00003: Forming fabric from knitted curves Invited Speaker: Michael Dimitriyev Through knitting, yarn, an essentially one-dimensional, curve-like material, is shaped into a lattice of slip-knots to form knitted fabric, a surface-like material. Despite the long history of these materials, modeling their mechanics has proven difficult owing to their complex architecture. To make progress towards this goal, we have developed a geometric framework for simplifying the parameterization of yarn shape. Upon minimizing the total bending energy of yarn, the resulting structures are remarkably realistic, despite the relative simplicity of the yarn model. Thus, we confirm that many of the emergent mechanical properties of knitted fabric can be understood in terms of the geometry of linked space curves. This allows us to not only simplify the representation of yarn within computer simulations, but to make progress towards identifying the key factors that determine how the wide range of mechanical and geometric properties of knitted fabric emerge from a given stitch pattern. [Preview Abstract] |
Thursday, November 7, 2019 10:00AM - 10:30AM |
A02.00004: Unusual Glassy Behavior of a Biologically Inspired Glass Former Invited Speaker: Daniel Sussman What can we learn about dense biological tissue by viewing it as a soft active matter system? The mechanical and dynamical properties of dense collections of cells help govern processes ranging from wound healing to embryonic development to cancer progression, and an outstanding challenge is developing tractable models that can predict and explain the amazing variety of complex phenomena that even simple cellular systems can exhibit. Recent experiments have shown, for example, that many tissues lie close to a collective rigidity transition, and I will discuss how simple coarse-grained models of dense tissue can support unusual forms of mechanical integrity. The glassy behavior of these model systems appears very different from that of more traditional soft matter models (e.g., hard or soft sphere glasses), and I will discuss the non-Arrhenius character of the biological models as viewed from both a simulation- and machine-learning-based perspective. [Preview Abstract] |
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