Abstract
We show how to implement stick boundary conditions for a spherical colloid in a solventthat is coarse-grained by the method of stochastic rotation dynamics. This allowsus to measure colloidal rotational velocity auto-correlation functions by directcomputer simulation. We find quantitative agreement with Enskog theory forshort times and with hydrodynamic mode-coupling theory for longer times. Foraqueous colloidal suspensions, the Enskog contribution to the rotational friction islarger than the hydrodynamic one when the colloidal radius drops below 35 nm.
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