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. Institute of Physics (IOP) Publishing. doi: 10.1088/0953-8984/24/46/464105.
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Official URL: http://stacks.iop.org/0953-8984/24/464105
Abstract
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.
Item URL in elib: | https://elib.dlr.de/78230/ | ||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||
Title: | Force-induced diffusion in microrheology | ||||||||||||||||||
Authors: |
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Date: | 31 October 2012 | ||||||||||||||||||
Journal or Publication Title: | Journal of Physics - Condensed Matter | ||||||||||||||||||
Refereed publication: | No | ||||||||||||||||||
Open Access: | No | ||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||
Volume: | 24 | ||||||||||||||||||
DOI : | 10.1088/0953-8984/24/46/464105 | ||||||||||||||||||
Page Range: | p. 464105 | ||||||||||||||||||
Publisher: | Institute of Physics (IOP) Publishing | ||||||||||||||||||
Status: | Published | ||||||||||||||||||
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 - Research under Space Conditions | ||||||||||||||||||
DLR - Research theme (Project): | R - Vorhaben Materialwissenschaftliche Forschung (old) | ||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space | ||||||||||||||||||
Deposited By: | Voigtmann, Dr.rer.nat. Thomas | ||||||||||||||||||
Deposited On: | 07 Nov 2012 12:06 | ||||||||||||||||||
Last Modified: | 06 Sep 2019 15:28 |
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