Active and Nonlinear Microrheology in Dense Colloidal Suspensions
Soft Condensed Matter
2009-06-19 v1
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.
Cite
@article{arxiv.0810.2627,
title = {Active and Nonlinear Microrheology in Dense Colloidal Suspensions},
author = {I. Gazuz and A. M. Puertas and Th. Voigtmann and M. Fuchs},
journal= {arXiv preprint arXiv:0810.2627},
year = {2009}
}