@article{discovery1367399, title = {Effects of surface roughness on self- and transport diffusion in porous media in the Knudsen regime}, journal = {Physical Review Letters}, number = {12}, volume = {87}, address = {USA}, month = {September}, year = {2001}, abstract = {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.}, url = {http://dx.doi.org/10.1103/PhysRevLett.87.125501}, author = {Coppens, M and Malek, K} }