Hydrodynamic Pair Attractions Between Driven Colloidal Particles

Details Hydrodynamic Pair Attractions Between Driven Colloidal Particles Hydrodynamic Pair Attractions Between Driven Colloidal Particles

2011-09-13

arxiv.org/abs/1109.2707v1

Phys. Rev. Lett. 107, 158302 (2011)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.158302

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.

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