PMID: 15244802Jul 13, 2004Paper

Diffusion of hard sphere fluids in disordered media: a molecular dynamics simulation study

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Rakwoo ChangArun Yethiraj

Abstract

Molecular dynamic simulations are reported for the static and dynamic properties of hard sphere fluids in matrices (or media) composed of quenched hard spheres. The effect of fluid and matrix density, matrix structure, and fluid to matrix sphere size ratio on the static and dynamic properties is studied using discontinuous molecular dynamics. The matrix density has a stronger effect on the self-diffusion coefficient than the fluid density, especially at high matrix densities where the geometric constraints due to the quenched spheres are significant. When the ratio of the size of the fluid spheres to that of the matrix spheres is equal to or greater than one, the diffusion increases as the fluid density is increased, at constant total volume fraction. This trend is however reversed if the ratio is smaller than one. Different methods of generating the matrix have a very strong effect on the dynamic properties even though the static correlations are similar. An analysis of the single-chain structure factor of the particle trajectories shows a change in the particle diffusive behavior at different time scales, suggestive of a hopping mechanism, although normal diffusion is recovered at long times. At high matrix densities, there i...Continue Reading

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Citations

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Nov 10, 2009·The Journal of Chemical Physics·María J Ariza, Antonio M Puertas
Feb 13, 2008·The Journal of Chemical Physics·Bong June Sung, Arun Yethiraj
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