α-relaxation processes in binary hard-sphere mixtures

G. Foffi, W. Götze, F. Sciortino, P. Tartaglia, Th. Voigtmann
2004 Physical Review E  
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
more » ... 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.
doi:10.1103/physreve.69.011505 pmid:14995626 fatcat:mgkxzjsrznfopntaswiqpwqw7m