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Published October 9, 2000 | public
Journal Article Open

Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface

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.

Additional Information

©2000 The American Physical Society Received 22 March 2000 Work at the University of Chicago was supported by the National Science Foundation through Grant No. DMR-9730189, through the MRSEC program of the NSF through Grant No. DMR-9880595, and by the David and Lucile Packard Foundation. Theoretical work was supported by the A. P. Sloan Foundation, the Mathematical Science Division of the National Science Foundation, and a NDSEG grant to T. S.

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August 21, 2023
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October 13, 2023