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Force-induced diffusion in microrheology

Harrer, Ch. J. and Winter, D. and Horbach, J. and Fuchs, M. and Voigtmann, Th. (2012) Force-induced diffusion in microrheology. Journal of Physics - Condensed Matter, 24, p. 464105. IOP. DOI: 10.1088/0953-8984/24/46/464105.

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Official URL: http://stacks.iop.org/0953-8984/24/464105


We investigate the force-induced diffusive motion of a tracer particle inside a glass-forming suspension when a strong external force is applied to the probe (active nonlinear microrheology). A schematic model of mode-coupling theory introduced recently is extended to describe the transient dynamics of the probe particle, and used to analyze recent molecular-dynamics simulation data. The model describes non-trivial transient displacements of the probe before a steady-state velocity is reached. The external force also induces diffusive motion in the direction perpendicular to its axis. We address the relation between the transverse diffusion coefficient D⊥ and the force-dependent nonlinear friction coefficient ζ. Non-diffusive fluctuations in the direction of the force are seen at long times in the MD simulation, while the model describes cross-over to long-time diffusion.

Document Type:Article
Title:Force-induced diffusion in microrheology
AuthorsInstitution or Email of Authors
Harrer, Ch. J.Universität Konstanz
Winter, D.Universität Mainz
Horbach, J.Universität Düsseldorf
Fuchs, M.Universität Konstanz
Voigtmann, Th.thomas.voigtmann@dlr.de
Date:31 October 2012
Journal or Publication Title:Journal of Physics - Condensed Matter
Refereed publication:No
In ISI Web of Science:Yes
Page Range:p. 464105
Keywords:microrheology, glass transition, diffusion
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dr.rer.nat. Thomas Voigtmann
Deposited On:07 Nov 2012 12:06
Last Modified:20 Mar 2013 19:45

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