TY  - JOUR
JF  - Physical Review Letters
VL  - 87
ID  - discovery1367399
UR  - http://dx.doi.org/10.1103/PhysRevLett.87.125501
Y1  - 2001/09//
TI  - Effects of surface roughness on self- and transport diffusion in porous media in the Knudsen regime
CY  - USA
IS  - 12
AV  - public
A1  - Coppens, M
A1  - Malek, K
N2  - 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.
ER  -