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Abstract
In this paper we report some aspects of our work on the description of tracer-diffusion phenomena in model two-dimensional binary colloidal mixtures. Here we study the effects of asymmetries between the two brownian species. In particular, we consider the effects of the dynamic asymmetry produced when the free-diffusion mobility of one of the species is reduced, thus resembling a sluggish porous matrix permeated by a colloidal liquid (the species with a “normal” free-diffusion mobility). This study consists mostly of Brownian dynamics simulations, but a theoretical interpretation of the results is also attempted, with the assistance of an approximate theory of tracer-diffusion in equilibrium colloidal mixtures (the single exponential approximation).
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