Abstract
By light scattering, we study the collective dynamics of binary mixtures of charged colloids at low ionic strength. The size asymmetry between colloids gives us access to the intermediate scattering function corresponding to the big colloids. We find that the global dynamic correlations relax faster as the number of small undetectable components increases, and Brownian Dynamics numerical simulations confirm this finding. From simulations, we identify that the gradual softening of interparticle correlations, as the number of small colloids increases, is at the origin of the weakening of the measured dynamic correlations. Furthermore, we put forward a semi-empirical scheme to estimate the hydrodynamic interactions, allowing us to improve the comparison between the dynamic light scattering data and numerical simulation results.
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