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Thinning and thickening in active microrheology

Wang, Ting and Sperl, Matthias (2016) Thinning and thickening in active microrheology. Physical Review E, 93, 022606. American Physical Society. doi: 10.1103/PhysRevE.93.022606. ISSN 2470-0045.

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Official URL: http://journals.aps.org/pre/abstract/10.1103/PhysRevE.93.022606


When pulling a probe particle in a many-particle system at a fixed velocity, the probe's effective friction, defined as the average external force over its velocity, γeff:=⟨Fex⟩/u, first stays constant (linear response), then decreases (thinning), and, finally, increases again (thickening). We propose a three-time-scale picture to describe the thinning and thickening behavior. There are three distinct time scales for the bath particles: diffusion, damping, and single probe-bath collision. The dominating time scales are controlled by the pulling velocity and determine the behavior of the probe's friction. We test and confirm this description with a Langevin dynamics simulation. Microscopically, we find that for computing the effective friction, the Maxwellian distribution of bath particles' velocities fails in the regime of high Reynolds and Peclet numbers. This can be understood based on the microscopic mechanism of thickening obtained in the T=0 limit. The dynamic regimes defined by the ratio of different time scales can explain several observations of thinning and thickening in literature.

Item URL in elib:https://elib.dlr.de/103166/
Document Type:Article
Title:Thinning and thickening in active microrheology
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wang, Tingting.wang (at) dlr.deUNSPECIFIED
Sperl, Matthiasmatthias.sperl (at) dlr.deUNSPECIFIED
Date:18 February 2016
Journal or Publication Title:Physical Review E
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:022606
Publisher:American Physical Society
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), R - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Sperl, Matthias
Deposited On:22 Feb 2016 07:19
Last Modified:17 Mar 2021 13:40

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