Mixing effects for the structural relaxation in binary hard-sphere liquids

Details Mixing effects for the structural relaxation in binary hard-sphere liquids Mixing effects for the structural relaxation in binary hard-sphere liquids

2003-03-31

arxiv.org/abs/cond-mat/0303652v1

Phys. Rev. Lett. 91, 085701 (2003)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.085701

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 five 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.

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