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Direct Measurement of Hydrodynamic Cross Correlations between Two Particles in an External Potential

Direct Measurement of Hydrodynamic Cross Correlations between Two Particles in an External Potential We report a direct measurement of the hydrodynamic interaction between two colloidal particles. Two micron-sized latex beads were held at varying distances in optical tweezers while their Brownian displacements were measured. In spite of the fact that fluid systems at low Reynolds number are generally considered to have no “memory,” the cross-correlation function of the bead positions shows a pronounced, time-delayed anticorrelation. We show that the anticorrelations can be understood in terms of the standard Oseen tensor hydrodynamic coupling. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Direct Measurement of Hydrodynamic Cross Correlations between Two Particles in an External Potential

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References (10)

Publisher
American Physical Society (APS)
Copyright
Copyright © 1999 The American Physical Society
ISSN
1079-7114
DOI
10.1103/PhysRevLett.82.2211
Publisher site
See Article on Publisher Site

Abstract

We report a direct measurement of the hydrodynamic interaction between two colloidal particles. Two micron-sized latex beads were held at varying distances in optical tweezers while their Brownian displacements were measured. In spite of the fact that fluid systems at low Reynolds number are generally considered to have no “memory,” the cross-correlation function of the bead positions shows a pronounced, time-delayed anticorrelation. We show that the anticorrelations can be understood in terms of the standard Oseen tensor hydrodynamic coupling.

Journal

Physical Review Letters – American Physical Society (APS)

Published: Mar 8, 1999

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