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American Physical Society, Physical Review Letters, 24(102), 2009

DOI: 10.1103/physrevlett.102.248302

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Active and Nonlinear Microrheology in Dense Colloidal Suspensions

Journal article published in 2008 by Igor Gazuz, Antonio Manuel Puertas, Th-H. Voigtmann ORCID, Matthias Fuchs
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This paper is available in a repository.

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Abstract

We present a first-principles theory for the active nonlinear microrheology of colloidal model systems: for constant external force on a spherical probe particle embedded in a dense host dispersion, neglecting hydrodynamic interactions, we derive an exact expression for the friction. Within mode-coupling theory (MCT), we discuss the threshold external force needed to delocalize the probe from a host glass, and its relation to strong nonlinear velocity-force curves in a host fluid. Experimental microrheology data and simulations, which we performed, are explained with a simplified model.