Abstract
The study of binary fluid phase transitions in porous media has received a great deal of attention, both theoretically and experimentally, over the past few years. The preferential wettability of the internal surfaces by one of the fluids introduces a randomness that has led to consideration of Random Field Ising Models. However, in certain cases such as Vycor glass, the confinement in the pores plays a dominant role. A different limit is obtained in the case of aerogels which have internal mass fractal density correlations. We discuss the theory of scattering by binary fluid concentration fluctuations in both these types of porous solid and recent studies of the scattering from water/lutidine critical and near-critical mixtures in these systems
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