Screened hydrodynamic interaction in a narrow channel |
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Authors: | Cui Bianxiao Diamant Haim Lin Binhua |
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Affiliation: | The James Franck Institute, Department of Chemistry, and CARS, The University of Chicago, Chicago, Illinois 60637, USA. |
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Abstract: | We study experimentally and theoretically the hydrodynamic coupling between Brownian colloidal particles diffusing along a linear channel. The quasi-one-dimensional confinement, unlike other constrained geometries, leads to a sharply screened interaction. Consequently, particles move in concert only when their mutual distance is smaller than the channel width, and two-body interactions remain dominant up to high particle densities. The coupling in a cylindrical channel is predicted to reverse sign at a certain distance, yet this unusual effect is too small to be currently detectable. |
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