title: Mixing effects for the structural relaxation in binary hard-sphere liquids.
abstract: We report extensive molecular-dynamics-simulation results for binary mixtures of hard spheres for different size disparities and different mixing percentages, for packing fractions up to 0.605, and over a characteristic time interval spanning up to 5 orders in magnitude. We explore the changes in the evolution of glassy dynamics due to mixing and discover two opposite scenarios: For large size disparity, increasing the mixing percentage of small particles leads to a speed up of long-time dynamics, while small disparity leads to a slowing down. These results agree with predictions based on the mode-coupling theory for ideal-glass transitions.
authors.affiliation: Dipartimento di Fisica and INFM Center for Statistical Mechanics and Complexity, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Foffi
authors.forename: W
authors.initials: W
authors.lastname: Götze
authors.forename: F
authors.initials: F
authors.lastname: Sciortino
authors.forename: P
authors.initials: P
authors.lastname: Tartaglia
authors.forename: Th
authors.initials: T
authors.lastname: Voigtmann