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Schematic Models for Active Nonlinear Microrheology

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arxiv 1010.2899 v1 pith:YX3JBFRC submitted 2010-10-14 cond-mat.soft

Manuel V. Gnann , Igor Gazuz , Antonio M. Puertas , Matthias Fuchs , Thomas Voigtmann This is my paper
classification cond-mat.soft
keywords nonlinearactiveanalyzebehaviorcolloidalmicrorheologymodelschematic
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We analyze the nonlinear active microrheology of dense colloidal suspensions using a schematic model of mode-coupling theory. The model describes the strongly nonlinear behavior of the microscopic friction coefficient as a function of applied external force in terms of a delocalization transition. To probe this regime, we have performed Brownian dynamics simulations of a system of quasi-hard spheres. We also analyze experimental data on hard-sphere-like colloidal suspensions [Habdas et al., Europhys. Lett., 2004, 67, 477]. The behavior at very large forces is addressed specifically.

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