Time-dependent self-diffusion in a semidilute suspension of Brownian particles

Abstract

We study the time-dependent self-diffusion coefficient for a semidilute suspension of interacting, spherical Brownian particles. It is shown that the parameters needed for a simple approximation to the memory function, which we have proposed in earlier work, may be obtained from the steady-state perturbed pair distribution function. We test the approximation for an exactly solvable model in which the particles interact with a square step or well potential. © 1992 American Institute of Physics.