Diffusion of interacting particles in discrete geometries.
We evaluate the self-diffusion and transport diffusion of interacting particles in a discrete geometry consisting of a linear chain of cavities, with interactions within a cavity described by a free-energy function. Exact analytical expressions are obtained in the absence of correlations, showing that the self-diffusion can exceed the transport diffusion if the free-energy function is concave. The effect of correlations is elucidated by comparison with numerical results. Quantitative agreement is obtained with recent experimental data for diffusion in a nanoporous zeolitic imidazolate framework material, ZIF-8.
Hasselt University, B-3590 Diepenbeek, Belgium.
T
T
Becker
K
K
Nelissen
B
B
Cleuren
B
B
Partoens
C
C
Van den Broeck