Screened hydrodynamic interaction in a narrow channel

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.

4 pages, 4 figures

References in corpus (4)

• Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface
• Like-charge attraction through hydrodynamic interaction
• Brownian Dynamics of a Sphere Between Parallel Walls
• Effective pseudo-potentials of hydrodynamic origin

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