Volume 57, Number 5, March 2002
|Page(s)||724 - 730|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Hydrodynamic coupling in diffusion of quasi–one-dimensional Brownian particles
The James Franck Institute and CARS - The University of Chicago
Chicago, Illinois 60637, USA
2 The Department of Chemistry - The University of Chicago Chicago, Illinois 60637, USA
Corresponding author: firstname.lastname@example.org
Accepted: 14 December 2001
We report a study of the diffusion of weakly interacting colloidal spheres in a one-dimensional groove using digital video microscopy. At a time much shorter than the direct interaction time, , the spheres diffuse according to Fick's law. The packing fraction dependence of the short-time diffusion coefficient is much stronger than in unbound bulk fluids, indicative of an enhanced hydrodynamic coupling between particles in a groove. At a later time (but still shorter than ) a subdiffusion (, where ) evolves, suggesting that the hydrodynamic coupling induces the subdiffusion. Correlated motion of spheres is identified both in the trajectories of the spheres and in the magnitude of the velocity pair-correlation.
PACS: 82.70.Dd – Colloids / 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids
© EDP Sciences, 2002
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