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Schematic Models for Active Nonlinear Microrheology

Gnann, M. V. and Gazuz, I. and Puertas, A. M. and Fuchs, M. and Voigtmann, Th. (2011) Schematic Models for Active Nonlinear Microrheology. Soft Matter, 7, pp. 1390-1396. DOI: 10.1039/c0sm00828a.

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Abstract

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.

Document Type:Article
Title:Schematic Models for Active Nonlinear Microrheology
Authors:
AuthorsInstitution or Email of Authors
Gnann, M. V.UNSPECIFIED
Gazuz, I.UNSPECIFIED
Puertas, A. M.UNSPECIFIED
Fuchs, M.UNSPECIFIED
Voigtmann, Th.thomas.voigtmann@dlr.de
Date:2011
Journal or Publication Title:Soft Matter
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:7
DOI:10.1039/c0sm00828a
Page Range:pp. 1390-1396
Status:Published
Keywords:nonlinear response, microrheology, colloidal suspension, mode-coupling theory, molecular-dynamics computer simulation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dr.rer.nat. Thomas Voigtmann
Deposited On:04 Oct 2011 16:38
Last Modified:04 Apr 2013 16:31

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