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      A computational model relating the self-assembly in a fluid of lath like particles with its rheology and gelation

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          Abstract

          We study the self-assembly leading to a gel transition occurring in a numerical model of a solution of slender, colloidal sized particles, called laths, who interact mostly in the direction perpendicular to their areas. At the particle level, the attraction causes them to align into long aggregates of several particles, called whiskers in the literature. To simulate the process, we have developed a Brownian dynamics model in which the attractive interaction comes from a potential energy that depends on both the relative orientation of the laths as well as normal vectors to their areas, disregarding their width. The simplicity of the model allows the simulation to reach large enough times, of the order of minutes, needed to simulate numerical rheology tests. With this we are able to characterize the whisker formation, as well as to simulate the gel transition. A a conclusion of this work, we have shown that the gel transition can occur even if the whiskers are not allowed to branch, as is the case in this model.

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          Author and article information

          Journal
          2016-01-25
          2016-03-26
          Article
          1601.06860
          b7fefd15-c934-4376-8b93-c564f2d1aaf6

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          23 pages, 16 figures
          physics.comp-ph cond-mat.soft

          Condensed matter,Mathematical & Computational physics
          Condensed matter, Mathematical & Computational physics

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