Using Available Volume to Predict Fluid Diffusivity in Random Media

Abstract

We propose a simple equation for predicting self-diffusivity of fluids embedded in random matrices of identical, but dynamically frozen, particles (i.e., quenched-annealed systems). The only nontrivial input is the volume available to mobile particles, which also can be predicted for two common matrix types that reflect equilibrium and non-equilibrium fluid structures. The proposed equation can account for the large differences in mobility exhibited by quenched-annealed systems with indistinguishable static pair correlations, illustrating the key role that available volume plays in transport.

to appear in Physical Review E (12 pages, 4 figures)

References in corpus (2)

• Liquid-glass transition of a fluid confined in a disordered porous matrix: A mode-coupling theory
• Quantification of Order in the Lennard-Jones System

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• Mode-coupling theory predictions for the dynamical transitions of the partly pinned fluid systems
• Statistical mechanics of homogeneous partly pinned fluid systems
• Three-dimensional Brownian diffusion of rod-like macromolecules in the presence of randomly distributed spherical obstacles: Molecular dynamics simulation
• Simple physics of the partly pinned fluid systems