Coppens, M;
Malek, K;
(2001)
Effects of surface roughness on self- and transport diffusion in porous media in the Knudsen regime.
Physical Review Letters
, 87
(12)
10.1103/PhysRevLett.87.125501.
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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.
| Type: | Article |
|---|---|
| Title: | Effects of surface roughness on self- and transport diffusion in porous media in the Knudsen regime |
| Location: | USA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.87.125501 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.87.125501 |
| Language: | English |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1367399 |
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