%0 Journal Article
%A Coppens, M
%A Malek, K
%C USA
%D 2001
%F discovery:1367399
%J Physical Review Letters
%N 12
%T Effects of surface roughness on self- and transport diffusion in porous media in the Knudsen regime
%U https://discovery.ucl.ac.uk/id/eprint/1367399/
%V 87
%X The effect of surface roughness on Knudsen diffusion in nanoporous media is investigated by means of dynamic Monte Carlo simulations in three-dimensional rough fractal pores. These simulations yield new insight and explain a number of apparent inconsistencies by revealing a striking difference between the roughness dependence of transport diffusion and gradientless (self- or tracer) diffusion. Both analytical and simulation results show a significant roughness dependence of self-diffusion in the Knudsen regime. Transport diffusion, on the other hand, is roughness independent, as the fluxes do not depend on the detailed residence time and molecular trajectories.