Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface
Eric R. Dufresne, Todd M. Squires, Michael P. Brenner, David G. Grier
Abstract
We describe direct imaging measurements of the collective and relative diffusion of two colloidal spheres near a flat plate. The bounding surface modifies the spheres' dynamics, even at separations of tens of radii. This behavior is captured by a stokeslet analysis of fluid flow driven by the spheres' and wall's no-slip boundary conditions. In particular, this analysis reveals surprising asymmetry in the normal modes for pair diffusion near a flat surface.
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