Influence of mass polydispersity on dynamics of simple liquids and colloids

Details Influence of mass polydispersity on dynamics of simple liquids and colloids Influence of mass polydispersity on dynamics of simple liquids and colloids

2001-07-17

arxiv.org/abs/cond-mat/0107351v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 6 figures

Scientific paper

10.1103/PhysRevE.65.011402

We conduct molecular dynamics computer simulations of a system of Lennard-Jones particles, polydisperse in both size and mass, at a fixed density and temperature. We test for and quantify systematic changes in dynamical properties that result from polydispersity, by measuring the pair distribution function, diffusion coefficient, velocity autocorrelation function, and non-Gaussian parameter, as a function of the degree of polydispersity. Our results elucidate the interpretation of experimental studies of collective particle motion in colloids, and we discuss the implications of polydispersity for observations of dynamical heterogeneity, in both simulations of simple liquids and colloid experiments.

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