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Growth kinetics of colloidal chains and labyrinths

Haw, Mark D. (2010) Growth kinetics of colloidal chains and labyrinths. Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 81 (3). 031402. ISSN 1063-651X

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    Particles interacting by a combination of isotropic short-range attraction and long-range repulsion have been shown to form complex phases despite the apparent simplicity of the interparticle potential. Using computer simulations we study the behavior of two-dimensional systems of colloids with such an interaction, focusing on how area fraction and repulsion range at fixed repulsion gradient may be used to tune the resulting kinetics and nonequilibrium structure. While the short-range attraction leads to aggregation, the long-range repulsion encourages growth of chains of particles due to repulsive intercluster interactions. Depending on area fraction/ repulsion range we observe chain labyrinths, chain-compact aggregate coexistence, and connected networks of chains. The kinetics of cluster growth displays a sequence of connected networks and disconnected cluster or chain systems with increasing repulsion range, indicating the competing roles of connectivity of growing chains and repulsion-driven breakup of chains into compact aggregates. Chain-dominated systems show approximately logarithmic coarsening at late time that we interpret as the result of chains performing random walks in the randomly fluctuating potential landscape created by their neighbors, a situation reminiscent of glassy systems.

    Item type: Article
    ID code: 20644
    Keywords: growth kinetics, colloidal chains, labyrinths, Bioengineering, Chemical engineering, Physical and theoretical chemistry, Solid state physics. Nanoscience, Physics and Astronomy(all), Mathematical Physics, Statistical and Nonlinear Physics, Condensed Matter Physics
    Subjects: Technology > Engineering (General). Civil engineering (General) > Bioengineering
    Technology > Chemical engineering
    Science > Chemistry > Physical and theoretical chemistry
    Science > Physics > Solid state physics. Nanoscience
    Department: Faculty of Engineering > Chemical and Process Engineering
    Related URLs:
      Depositing user: Dr Mark Haw
      Date Deposited: 13 Jul 2010 16:20
      Last modified: 08 Aug 2014 10:26

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