Now showing items 1-20 of 22

    • Symposium on Soft Matter Forefronts - Welcome 

      Alexeev, Alex; Brettmann, Blair; Fernandez-Nieves, Alberto; Matsumoto, Sabetta; Rocklin, David Zeb; Yunker, Peter (Georgia Institute of Technology, 2018-04-18)
      The symposium aims to familiarize attendees with the soft-matter research and expertise at Georgia Tech and to demonstrate the role Georgia Tech plays in influencing and advancing the field.
    • Some Universal Features of Soft Random Solids 

      Goldbart, Paul M. (Georgia Institute of Technology, 2018-04-18)
      The aim of this talk is to look at soft random solids through the lens of condensed matter theory, and to explore how their core features -- most notably their random structure and elasticity –- emerge via the collective ...
    • Topology in Polar Flocking and Active Nematics 

      Bowick, Mark (Georgia Institute of Technology, 2018-04-18)
      Active flocking on curved surfaces, such as the 2-sphere and the catenoid, exhibits dynamical symmetry breaking in the form of spontaneous flow, calculable inhomogeneous density patterns and long-wavelength propagating ...
    • Unusual Director Configurations and Diffusion Driven by Liquid Crystal Elastic Anisotropy 

      Yodh, Arjun G. (Georgia Institute of Technology, 2018-04-18)
      I will describe experiments that probe effects of twist elastic anisotropy in lyotropic chromonic liquid crystals (LCLCs) on the director configurations in cylinders/spheres and on particle diffusion. Time permitting, I ...
    • Geometric Underpinnings of Auxetic Behavior 

      Streinu, Ileana (Georgia Institute of Technology, 2018-04-18)
      In materials science, auxetic behavior is characterized by negative Poisson's ratios. We have recently developed a purely geometric theory of auxetic behavior for periodic framework materials. In this talk I will present ...
    • The Topological Character of Smectics 

      Kamien, Randy (Georgia Institute of Technology, 2018-04-18)
      Though the systematic use of topology to understand defects in ordered matter is now nearly 50 years old, the original work failed to completely characterize systems with broken translational order, i.e., crystals. Smectics ...
    • Mechanics of Active Networks – Lessons from Fire Ant Aggregations 

      Sridhar, Shankar Lalitha; Vernerey, Franck; Fernandez-Nieves, Alberto; Shen, Tong (Georgia Institute of Technology, 2018-04-19)
      Biological assemblies in nature are seen as active matter due to their ability to perform intelligent collective motion based on neighbor interactions and sometimes without any centralized control or leadership. Fire ants ...
    • Cellular Packing, Mechanical Stress and the Evolution of Multicellularity 

      Jacobeen, Shane; Brandys, Colin G.; Graba, Elyes C.; Pentz, Jennifer T.; Ratcliff, William C.; Yunker, Peter J. (Georgia Institute of Technology, 2018-04-19)
      The evolution of multicellularity set the stage for sustained increases in organismal complexity. However, a fundamental aspect of this transition remains largely unknown: how do simple clusters of cells evolve increased ...
    • Why is Structural Hierarchy So Prevalent in Biological Materials? 

      Michel, Jonathan; Yunker, Peter (Georgia Institute of Technology, 2018-04-19)
      Structural hierarchy, in which materials possess distinct features on multiple length scales, is ubiquitous in nature. Many biological materials, such as bone, cellulose, and muscle, have as many as ten hierarchical levels. ...
    • How Hidden Geometric Symmetries in Origami Generate New Folding Mechanisms 

      McInerney, James; Rocklin, David Zeb (Georgia Institute of Technology, 2018-04-19)
      The traditional Japanese art of paper folding has inspired various foldable materials, some now realizable at the atomic scale. These thin sheets use engineered crease patterns to provide a desired mechanical response ...
    • Probing Active Nematic Films with Magnetically Manipulated Colloids 

      Rivas, David; Henry, Robert; Leheny, Robert; Reich, Daniel (Georgia Institute of Technology, 2018-04-19)
      Active nematics are non-equilibrium liquid crystalline systems composed of self driven particles whose motility creates flows that lead to perpetual changes in the local nematic director. We employ magnetically manipulated ...
    • Fracturing of Marginally Stable Structures: Fiber Networks and Topological Metamaterials 

      Mao, Xiaoming (Georgia Institute of Technology, 2018-04-19)
      When conventional brittle materials break, long cracks form due to stress focusing at crack tips: a phenomenon explained by Griffith in the 1920s. In this talk, we will discuss two types of systems where the fracturing ...
    • New Results for Old Physics: Critical Phenomena for Colloids in Microgravity 

      Weitz, Dave (Georgia Institute of Technology, 2018-04-19)
      This talk will describe results from experiments conducted in the absence of gravitational forces allowing the effects very delicate interactions between colloidal particles to be explored. The behavior very close to the ...
    • Symmetry Breaking During the Synthesis of Nanoparticles 

      Xia, Younan (Georgia Institute of Technology, 2018-04-19)
      Symmetry breaking is a ubiquitous phenomenon that occurs spontaneously when a system is subjected to variations in size and/or perturbations in terms of thermodynamic parameters. As a stochastic process, even small ...
    • Ordered and Disordered Motion in Dense Active Materials 

      Berthier, Ludovic (Georgia Institute of Technology, 2018-04-19)
      We discuss how the non-equilibrium driving forces introduced by the natural biological activity or by physical self-propulsion mechanisms generically affect the structure, dynamics and phase behavior of dense active media. ...
    • Cell Contraction Induces Long-Ranged Stress Stiffening in the Extracellular Matrix 

      Ronceray, Pierre; Han, Yu Long; Lenz, Martin; Broedersz, Chase; Guo, Ming (Georgia Institute of Technology, 2018-04-19)
      Animal cells in tissues are supported by biopolymer matrices, which exhibit highly nonlinear mechanical properties. Here we show that this nonlinearity allows living contractile cells to generate a massive stiffness gradient ...
    • Self–Assembled DNA Liquids: Properties and Protein Activation 

      Saleh, Omar (Georgia Institute of Technology, 2018-04-19)
      Biomolecules can self-assemble into liquid phases, termed ‘membraneless organelles’ in the biological context, though also known as ‘coacervates’. I will discuss our efforts to study this by exploiting DNA nanotechnology ...
    • Quantifying Hidden Order Out of Equilibrium 

      Chaikin, Paul (Georgia Institute of Technology, 2018-04-20)
      While the equilibrium properties, states, and phase transitions of interacting systems are well described by statistical mechanics, the lack of suitable state parameters has hindered the understanding of non-equilibrium ...
    • Highly Efficient Oil-Water Separation Using Surface-Programmable Membranes 

      Zeng, Minxiang (Glenn); Zhang, Eric; Huang, Dali; Cheng, Zhengdong (Georgia Institute of Technology, 2018-04-20)
      The challenge of separating emulsified oil from oil/water mixture has sparked enormous research interests in developing advanced membrane technology. One of the most crucial elements to achieve high separating efficiency ...
    • Exploiting Disorder 

      Nagel, Sidney (Georgia Institute of Technology, 2018-04-20)
      We are taught to understand solids by considering ideal crystals. This approach becomes untenable as the amount of disorder increases; for a glass with no well-defined long-range order, a crystal is an abysmal starting ...