Dynamic coupling in binary mixtures of charged colloids: A rescaled mode-coupling theory approach.

We investigate structure-dynamics relations in binary mixtures of highly charged colloidal suspensions employing multi-component mode-coupling theory (MCT) based on partial static structure factors from thermodynamically consistent integral equations with Rogers-Young (RY) closure. In mixtures of identically charged particles with different sizes and thus short-time mobilities, MCT predicts long time dynamical coupling effects between different species in qualitative accordance to Brownian dynamics (BD) simulations. Within a rescaled MCT scheme based on structure factors of systems with reduced number of effective charges, quantitative agreement of long-time self-diffusion coefficients from MCT and BD is achieved. At intermediate scales of time, however, even in the results within the rescaled MCT scheme, small deviations between rescaled MCT and BD results are observed.