Abstract
Vycor 7930 porous glass was studied by adsorption in conjunction with small-angle scattering (SAS) and by relative permeability. Analysis of the SAS spectra showed that, at late stages of the adsorption process, the Kelvin radius is related to the mean curvature of a more complicated shape than a simple geometrical one. Further, from the analysis of relative permeability data, a pore-connectivity value of ∼3 was deduced. This suggests that, at a pore junction of this type, the formation of void pockets prescribed by an adsorbed film having opposite radii of curvature is possible. When this is the case, a delay of the condensation process will occur and if this is not taken into account it may erroneously be interpreted as macropores.
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