We study the forced motion of a tagged soft particle through a jammed suspension of identical soft particles using particle simulations. We relate the local particle dynamics, microstructure, and microrheology to the bulk rheological properties of the suspension. At small forces, the tagged particle is trapped in a cage of other particles that resist the external force whereas at larger forces the tagged particle breaks free of its cage. This is indicative of the macroscopic yielding behavior in these materials. The threshold force from microrheology is quantitatively related to the macroscopic yield stress. The computed microviscosity also follows the shear thinning nature of these glasses and matches the exponent of 0.5 observed in bulk measurements. The semiquantitative agreement between the micro and bulk viscosity is discussed by comparing the microstructural processes involved in both. In microrheology, at moderate forces, the probe displacement causes an accumulation of particles in the direction of motion and a depleted wake behind. In bulk rheology, there are accumulation and depletion of particles along the compression and extension axes, respectively. Despite these differences, the average number of contacts and the elastic contact force on the particles are similar, which justifies why microrheology measurements match bulk rheology data.
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September 2014
Research Article|
September 01 2014
Active microrheology of soft particle glasses
Lavanya Mohan;
Lavanya Mohan
Department of Chemical Engineering and Texas Materials Institute,
The University of Texas at Austin
, Austin, Texas 78712
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Michel Cloitre;
Michel Cloitre
Matière Molle et Chimie (UMR 7167, ESPCI-CNRS)
, ESPCI ParisTech, 10 Rue Vauquelin, 75005 Paris, France
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Roger T. Bonnecaze
Roger T. Bonnecaze
a)
Department of Chemical Engineering and Texas Materials Institute,
The University of Texas at Austin
, Austin, Texas 78712
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a)
Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 58, 1465–1482 (2014)
Article history
Received:
December 13 2013
Accepted:
June 26 2014
Citation
Lavanya Mohan, Michel Cloitre, Roger T. Bonnecaze; Active microrheology of soft particle glasses. J. Rheol. 1 September 2014; 58 (5): 1465–1482. https://doi.org/10.1122/1.4887535
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