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

J T Padding1, A Wysocki2, H Löwen2 and A A Louis1

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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.


PACS

82.70.Dd Colloids

47.57.J- Colloidal systems

47.57.E- Suspensions

82.70.Kj Emulsions and suspensions

Subjects

Soft matter, liquids and polymers

Fluid dynamics

Chemical physics and physical chemistry

Dates

Issue 45 (16 November 2005)

Received 13 October 2005

Published 28 October 2005



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