Small-angle neutron scattering by porous Vycor glass at scattering vectors above 0.025 A^-1 decays as Q^-n. However, both intensity and power-law exponent differ markedly between a dry sample, which has a fractally rough surface with dimensionality D{~}2.5, and a water-saturated sample with identical scattering contrast, implying that the pore surfaces undergo gross geometrical changes on drying. The temperature variation of intensity at constant Q confirms the existence of a diffuse supercooling transition centered at about 260 K.
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Benham et al. (1989) studied this question.
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