Layering and position-dependent diffusive dynamics of confined fluids

Abstract

We study the diffusive dynamics of a hard-sphere fluid confined between parallel smooth hard walls. The position-dependent diffusion coefficient normal to the walls is larger in regions of high local packing density. High density regions also have the largest available volume, consistent with the fast local diffusivity. Indeed, local and global diffusivities as a function of the Widom insertion probability approximately collapse onto a master curve. Parallel and average normal diffusivities are strongly coupled at high densities and deviate from bulk fluid behavior.

References in corpus (2)

• Phase behavior of hard spheres confined between parallel hard plates: Manipulation of colloidal crystal structures by confinement
• Cofinement, entropy, and single-particle dynamics of equilibrium hard-sphere mixtures

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