Diffusion of fluids in confined geometry.
Pulsed field gradient NMR measurements of restricted self-diffusion of three nonspecific liquids are reported in well characterised samples with average pore diameters ranging between 35 A and 500 A. Structural information has been obtained in the long-times and small "wave-vectors" regime, using an exact analytic solution for the related problem of "thin" semi-permeable barriers. Experimental results suggest that the permeability of a porous medium depends on the porosity (connectivity) of the pore space and the molecular size of the self-diffusing molecules.
Mitzithras
A
A
Physics Laboratory, University of Kent, Canterbury, UK.
Strange
J H
JH
D003510:Cyclohexanes; D004058:Diffusion; D009682:Magnetic Resonance Spectroscopy; D010539:Permeability; D016062:Porosity; D012822:Silicon Dioxide
D003510:Cyclohexanes; D012822:Silicon Dioxide