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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.68: Poster
Thursday, March 30, 2006, 16:00–18:00, P1
Shear-driven gelation in two dimensions — •Daniel Rings1, Kajetan Bentele2, and Klaus Kroy1 — 1Institut für Theoretische Physik, Universität Leipzig, Vor dem Hospitaltore 1, D-04103 Leipzig — 2Abteilung Theoretische Physik (SF5), Hahn-Meitner-Institut Berlin, Glienicker Str. 100, D-14109 Berlin
Cluster aggregation and gelation under shear flow are studied by off-lattice molecular dynamics simulation of a colloidal suspension. The two dimensional model of sticky hard disks includes rotations of the growing clusters induced by the constant shear rate of the solvent. We are studying the liquid-gel phase transition characterized by a jammed state of the system after a finite time depending on the particles’ volume fraction. The fractal structure of the spanning cluster is analyzed and interpreted in terms of a crossover from kinetic aggregation to percolation theory. Finite size effects in confined geometries are also considered.