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DY: Fachverband Dynamik und Statistische Physik

DY 23: Finite size effects at phase transitions III (session accompanying the symposium of the same name)

DY 23.6: Talk

Wednesday, March 28, 2007, 17:00–17:15, H3

Jamming Transition in Two-Dimensional Shear-Driven Aggregation — •Daniel Rings and Klaus Kroy — Institut für theoretische Physik, Universität Leipzig, Vor dem Hospitaltore 1, 04103 Leipzig

Aggregation of colloids has an impact on various technological as well as biological systems. Examples range from accumulation of dust in bearings to clotting within blood vessels. While percolation theory describes the thermodynamic limit, we are interested in the specific features of such finite systems.

We study the shear-induced jamming transition within a toy model for colloidal suspensions. Implementing the rather novel simulation method of Collision-Driven Dynamics (CD) powered by Interval Arithmetics, we find a transition from kinetic aggregation to percolative behavior above a critical density in finite systems. Intriguingly, different density regimes show distinct structure formation encoded in fractal dimension and jamming time. A kinetic model has been developed in order to predict that time based on the specific density-dependent clustering mechanism.