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Probability Densities of a Forced Probe Particle in Glass: Results from Mode Coupling Theory and Simulations of Active Microrheology

Harrer, Ch. J. and Puertas, A. M. and Voigtmann, Th. and Fuchs, M. (2012) Probability Densities of a Forced Probe Particle in Glass: Results from Mode Coupling Theory and Simulations of Active Microrheology. Zeitschrift für Physikalische Chemie, 226, pp. 779-795. DOI: 10.1524/zpch.2012.0275.

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Abstract

We investigate the displacements of a probe particle inside a glass, when a strong external force is applied to the probe (active nonlinear microrheology). Calculations within mode coupling theory are presented for glasses of hard spheres and compared to Langevin and Brownian dynamics simulations. Under not too strong forces where the probe remains trapped, the probe density distribution becomes anisotropic. It is shifted towards the direction of the force, develops an enhanced tail in that direction (signaled by a positive skewness), and exhibits different variances along and perpendicular to the force direction. A simple model of an harmonically trapped probe rationalizes the low force limit, with strong strain softening setting in at forces of the order of a few thermal energies per particle radius.

Document Type:Article
Title:Probability Densities of a Forced Probe Particle in Glass: Results from Mode Coupling Theory and Simulations of Active Microrheology
Authors:
AuthorsInstitution or Email of Authors
Harrer, Ch. J.Universität Konstanz
Puertas, A. M.Universidad de Almeria
Voigtmann, Th.thomas.voigtmann@dlr.de
Fuchs, M.Universität Konstanz
Date:September 2012
Journal or Publication Title:Zeitschrift für Physikalische Chemie
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:226
DOI:10.1524/zpch.2012.0275
Page Range:pp. 779-795
Status:Published
Keywords:micro-rheology, mode coupling theory, local elastic constants
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:02 Oct 2012 08:40
Last Modified:21 Mar 2014 03:06

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