Layering and Position-Dependent Diffusive Dynamics of Confined Fluids Academic Article uri icon

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.

published proceedings

  • Physical Review Letters

author list (cited authors)

  • Mittal, J., Truskett, T. M., Errington, J. R., & Hummer, G.

publication date

  • January 1, 2008 11:11 AM