Journal
SOFT MATTER
Volume 7, Issue 4, Pages 1390-1396Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0sm00828a
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Funding
- Deutsche Forschungsgemeinschaft [SFB TR6, A7]
- Helmholtz-Gemeinschaft (HGF Hochschul-Nachwuchsgruppe) [VH-NG 406]
- Junta de Andalucia [P09-FQM-4938]
- Zukunftskolleg der Universitat Konstanz
- German Excellence Initiative
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We analyze the nonlinear active microrheology of dense colloidal suspensions using a schematic model of mode-coupling theory. The model describes the strongly nonlinear behavior of the microscopic friction coefficient as a function of applied external force in terms of a delocalization transition. To probe this regime, we have performed Brownian dynamics simulations of a system of quasi-hard spheres. We also analyze experimental data on hard-sphere-like colloidal suspensions [Habdas et al., Europhys. Lett., 2004, 67, 477]. The behavior at very large forces is addressed specifically.
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