Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 15, Pages 3317-3320Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3317
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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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