Hydrodynamic pair attractions between driven colloidal particles

Yulia Sokolov, Derek Frydel, David G. Grier, Haim Diamant, Yael Roichman

    Research output: Contribution to journalArticlepeer-review


    Colloidal spheres driven through water along a circular path by an optical ring trap display unexpected dynamical correlations. We use Stokesian dynamics simulations and a simple analytical model to demonstrate that the path's curvature breaks the symmetry of the two-body hydrodynamic interaction, resulting in particle pairing. The influence of this effective nonequilibrium attraction diminishes as either the temperature or the stiffness of the radial confinement increases. We find a well-defined set of dynamically paired states whose stability relies on hydrodynamic coupling in curving trajectories.

    Original languageEnglish (US)
    Article number158302
    JournalPhysical Review Letters
    Issue number15
    StatePublished - Oct 6 2011

    ASJC Scopus subject areas

    • General Physics and Astronomy


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