Now showing items 1-5 of 5

    • Aseembly of Vorticity-Aligned Hard-Sphere Colloidal Strings in a Simple Shear Flow 

      Cheng, X.; Xu, X.; Rice, S.A.; Dinner, A.R.; Cohen, I. (Proceedings of the National Academy of Sciences of the United States of America, 2011-12-23)
      Colloidal suspensions self-assemble into equilibrium structures ranging from face- and body-centered cubic crystals to binary ionic crystals, and even kagome lattices. When driven out of equilibrium by hydrodynamic ...
    • Direct Measurements of Island Growth and Step-Edge Barriers in Colloidal Epitaxy 

      Ganapathy, R.; Buckley, M.R.; Gerbode, S.J.; Cohen, I. (AMER ASSOC ADVANCEMENT SCIENCE, 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA, 2010-01-22)
      Epitaxial growth, a bottom-up self-assembly process for creating surface nano-and microstructures, has been extensively studied in the context of atoms. This process, however, is also a promising route to self-assembly of ...
    • Dislocations and vacancies in two-dimensional mixed crystals of spheres and dimers 

      Gerbode, S.J.; Ong, D.C.; Liddell, C.M.; Cohen, I. (Physical Review E, 2010-10-15)
      In colloidal crystals of spheres, dislocation motion is unrestricted. On the other hand, recent studies of relaxation in crystals of colloidal dimer particles have demonstrated that the dislocation dynamics in such crystals ...
    • High Resolution Shear Profile Measurements in Entangled Polymers 

      Hayes, K.A.; Buckley, M.R.; Cohen, I.; Archer, L.A. (Physical Review Letters, 2008-11-17)
      We use confocal microscopy and particle image velocimetry to visualize motion of 250-300 nm. fluorescent tracer particles in entangled polymers subject to a rectilinear shear flow. Our results show linear velocity profiles ...
    • Imaging the microscopic structure of shear thinning and thickening colloidal suspension 

      Cheng, X.; McCoy, J.H.; Israelachvili, J.N.; Cohen, I. (AMERICAN ASSOCIATION ADVANCEMENT SCIENCE, 2011-09-02)
      The viscosity of colloidal suspensions varies with shear rate, an important effect encountered in many natural and industrial processes. Although this non-Newtonian behavior is believed to arise from the arrangement of ...