Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.248302
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Funding
- Deutsche Forschungsgemeinschaft
- Zukunftskolleg der Universitat Konstanz [MAT-2006-13646-CO3-02]
- DFG
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We present a first-principles theory for the active nonlinear microrheology of colloidal model system; for a 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, 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.
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