Molecular dynamics of a dense fluid of polydisperse hard spheres

Details Molecular dynamics of a dense fluid of polydisperse hard spheres Molecular dynamics of a dense fluid of polydisperse hard spheres

2000-04-13

arxiv.org/abs/cond-mat/0004224v1

Journal of Chemical Physics v113 p4732-4739 (2000)

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 5 figures

Scientific paper

10.1063/1.1288804

Slow dynamics in a fluid are studied in one of the most basic systems possible: polydisperse hard spheres. Monodisperse hard spheres cannot be studied as the slow down in dynamics as the density is increased is preempted by crystallisation. As the dynamics slow they become more heterogeneous, the spread in the distances traveled by different particles in the same time increases. However, the dynamics appears to be less heterogeneous than in hard-sphere-like colloids at the same volume fraction. The particles which move least far in a characteristic relaxation time and, particularly, the particles which move farthest in the same time are clustered, not randomly distributed throughout the sample. We study the dynamics at three different widths of the distribution of diameters of the hard spheres. For each width, the relaxation time is the same function of the compressibility factor, suggesting that this determines the relaxation time for hard spheres.

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