Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface

Details Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface

2000-03-17

arxiv.org/abs/cond-mat/0003314v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.85.3317

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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