Layering and Position-Dependent Diffusive Dynamics of Confined Fluids

by: Jeetain Mittal, Thomas M Truskett, Jeffrey R Errington, Gerhard Hummer

Physical Review Letters, Vol. 100, No. 14. (2008)

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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.

@article{citeulike:2746148, 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.}, author = {Mittal, Jeetain and Truskett, Thomas M. and Errington, Jeffrey R. and Hummer, Gerhard }, citeulike-article-id = {2746148}, doi = {http://dx.doi.org/10.1103/PhysRevLett.100.145901}, journal = {Physical Review Letters}, keywords = {confinement, simulation}, number = {14}, posted-at = {2008-05-02 16:48:09}, priority = {4}, publisher = {APS}, title = {Layering and Position-Dependent Diffusive Dynamics of Confined Fluids}, url = {http://dx.doi.org/10.1103/PhysRevLett.100.145901}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2746148 L3 - citeulike-article-id:2746148 TI - Layering and Position-Dependent Diffusive Dynamics of Confined Fluids JF - Physical Review Letters VL - 100 IS - 14 PB - APS N2 - 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. KW - confinement KW - simulation AU - Mittal, Jeetain AU - Truskett, Thomas AU - Errington, Jeffrey AU - Hummer, Gerhard PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevLett.100.145901 ER -

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