Short-time diffusion of anisotropic particles in suspension-A perturbative approach

We combine the perturbation approach due to Brenner with the induced force formalism developed by Mazur and coworkers to obtain expressions for the friction and mobility tensors for a suspension of deformed spheres. Specializing to spheroids, we show that our general expressions reduce to previously known results both for an isolated particle and for a pair of particles. Furthermore it appears that the first-order perturbation treatment gives surprisingly accurate results even for large deformations from a spherical geometry. Finally we use the renormalized density fluctuation method due to Beenakker and Mazur to calculate the ensemble average of the one particle mobility over a wide range of particle volume fractions.