Measurement of the hydrodynamic forces between two polymer-coated spheres

Details Measurement of the hydrodynamic forces between two polymer-coated spheres Measurement of the hydrodynamic forces between two polymer-coated spheres

2000-12-14

arxiv.org/abs/cond-mat/0012271v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 3 figures

Scientific paper

10.1098/rsta.2000.0805

The hydrodynamic forces between Brownian spheres are determined from a measurement of the correlated thermal fluctuations in particle position using a new method, two-particle cross-correlation spectroscopy (TCS). A pair of 1.3 um diameter polymer-coated poly(methyl methacrylate) were held at separations of between 2 um and 20 um using optical traps. The mobility tensor is determined directly from the statistically-averaged Brownian fluctuations of the two spheres. The observed distance dependence of the mobility tensor is in quantitative agreement with low-Reynolds number calculations.

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