Abstract
Diffusion coefficients of benzene in porous plugs compressed from Aerosil were measured by the spin echo technique with the use of constant and pulsed field gradients. In order to obtain surface self-diffusion coefficients D s ∗ the contribution from molecular mobility in the pore volume has been evaluated. D s ∗ shows a maximum near θ = 1 in agreement with earlier results obtained from rates of adsorption. Differences between the limiting experimental diffusion coefficients in the region of capillary condensation and the bulk liquid are attributed to the tortuosity of the pore system. Activation energies for surface self-diffusion are larger than for T 2.
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