Many-body force and mobility measurements in colloidal systems

Jason W. Merrill, Sunil K. Sainis, Jerzy Bławzdziewicz, Eric R. Dufresne

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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.

Original languageEnglish
Pages (from-to)2187-2192
Number of pages6
JournalSoft Matter
Issue number10
StatePublished - 2010


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