Stick boundary conditions and rotational velocity auto-correlation functions for colloidal particles in a coarse-grained representation of the solvent

Journal article (2005)

Authors

J.T. Padding University of Cambridge
A. Wysocki Universität Düsseldorf
H. Löwen Universität Düsseldorf
A. A. Louis University of Cambridge
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Published Date

16-11-2005

Language

English

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Abstract

We show how to implement stick boundary conditions for a spherical colloid in a solvent that is coarse-grained by the method of stochastic rotation dynamics. This allows us to measure colloidal rotational velocity auto-correlation functions by direct computer simulation. We find quantitative agreement with Enskog theory for short times and with hydrodynamic mode-coupling theory for longer times. For aqueous colloidal suspensions, the Enskog contribution to the rotational friction is larger than the hydrodynamic one when the colloidal radius drops below 35 nm.