Screened hydrodynamic interaction in a narrow channel

Details Screened hydrodynamic interaction in a narrow channel Screened hydrodynamic interaction in a narrow channel

2002-05-17

arxiv.org/abs/cond-mat/0205386v2

Phys Rev Lett 89, 188302 (2002)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.89.188302

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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