Using lattice Monte Carlo simulation, activated diffusion through various porous structures was studied and compared with CNT composite materials. Flux enhancement was found to be substantial beyond the percolation threshold of nanotube aggregates, especially for relatively low-porosity structures. The simulation results were captured by a simple model that accounted for two contributions to the flux: diffusion within the percolating nanotube clusters and inside the porous substrate. Such porous structures may form better catalysts, membranes or molecular sieves where an increase in both surface area and flux was required.

Diffusion Enhancement in Composites of Nanotubes and Porous Structures. S.Srebnik, M.Sheintuch: Molecular Simulation, 2009, 35[1-2], 100-8