Molecular-dynamics simulations are presented for two correlation functions
formed with the partial density fluctuations of binary hard-sphere mixtures in
order to explore the effects of mixing on the evolution of glassy dynamics upon
compressing the liquid into high-density states. Partial-density-fluctuation
correlation functions for the two species are reported. Results for the
alpha-relaxation process are quantified by parameters for the strength, the
stretching, and the time scale, where the latter varies over almost four orders
of magnitude upon compression. The parameters exhibit an appreciable dependence
on the wave vector; and this dependence is different for the correlation
function referring to the smaller and that for the larger species. These
features are shown to be in semi-quantitative agreement with those calculated
within the mode-coupling theory for ideal liquid-glass transitions.Comment: 14 pages, 20 figures, RevTe