Interaction between Penetration Sites in Diffusion through thin Membranes
Two models of permeation through thin membranes are proposed: in the first, the membrane is represented as a plate with randomly distributed perforations, and the permeation rate is controlled by the rate at which penetrant diffuses through an external medium; in the second, the penetrant is considered to be adsorbed on one face of the membrane, and the rate controlling process is lateral diffusion across that face to a set of randomly distributed penetration sites. These models are treated by a self-consistent field procedure, and it appears that interaction between penetration sites influences the permeability significantly even when the number of penetration sites per unit area is quite low.
KeywordsLeaf Surface Lateral Diffusion Effective Permeability Permeation Rate Thin Membrane
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