Issue 10, 2010

Many-body force and mobility measurements in colloidal systems

Abstract

We demonstrate a technique for simultaneously measuring each component of the force vectors and mobility tensor of a small collection of colloidal particles based on observing a set of particle trajectories. For a few-body system of micron-sized polymer beads in oil separated by several particle radii, we find that the mobility tensor is well-described by a pairwise Stokeslet model. This stands in contrast to the electrostatic interactions, which were found to deviate significantly from a pairwise model. The measurement technique presented here should be simple to extend to systems of heterogeneous, non-spherical particles arranged in arbitrary three dimensional geometries.

Graphical abstract: Many-body force and mobility measurements in colloidal systems

Article information

Article type
Paper
Submitted
22 Dec 2009
Accepted
22 Feb 2010
First published
01 Apr 2010

Soft Matter, 2010,6, 2187-2192

Many-body force and mobility measurements in colloidal systems

J. W. Merrill, S. K. Sainis, J. Bławzdziewicz and E. R. Dufresne, Soft Matter, 2010, 6, 2187 DOI: 10.1039/B926845F

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