Dynamical properties of wall-confined colloids
Universität Konstanz, Fachbereich Physik - Postfach 5560,
D-78457 Konstanz, Germany
Corresponding author: Raphael.Pesche@Uni-Konstanz.de
Accepted: 29 June 2000
We report on a Stokesian Dynamics simulation study of monolayers of spherical colloidal particles diffusing in the midplane between two parallel walls. The method accounts for many-body hydrodynamic interactions (HI) between particles and particles and walls. Two cases are studied: hard spheres between neutral walls and charged particles interacting by a Yukawa-type potential. Various properties are calculated: mean-squared displacement, self-diffusion coefficient, van Hove functions and hydrodynamic functions. The importance of HI is assessed by treating particle-particle and particle-wall HI separately. Striking features are discussed like the hydrodynamic enhancement of self-diffusion for strongly charged particles and the unbounded increase of the hydrodynamic function at small wave numbers.
PACS: 82.70.Dd – Colloids / 05.10.Gg – Stochastic analysis methods (Fokker-Planck, Langevin, etc.) / 05.40.Jc – Brownian motion
© EDP Sciences, 2000