Hydrodynamic interactions in confined colloidal suspensions
J.L. Arauz

Instituto de Fisica, Universidad Autonoma de San Luis Potosi Mexico

Abstract: The effect of the hydrodynamic interactions on the motion of confined colloidal particles is studied by optical microscopy. We consider three cases: colloidal particles close to a single wall, confined in a spherical drop, or confined between two walls. In all cases, we track the particles motion using a CCD camera operating at 30 frames per second. From the particles trajectories, different quantities describing the hydrodynamic interactions particle-particle and particle-confining boundaries are obtained. Here, results for quantities such as the mean squared displacement, step distribution functions, hydrodynamic diffusion coefficients and the hydrodynamic function are presented.