title: Hydrodynamic pair attractions between driven colloidal particles.
abstract: 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.
authors: Raymond and Beverly Sackler School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel.
authors: Yulia
authors: Y
authors: Sokolov
authors: Derek
authors: D
authors: Frydel
authors: David G
authors: DG
authors: Grier
authors: Haim
authors: H
authors: Diamant
authors: Yael
authors: Y
authors: Roichman