A Vycor porous glass is examined by adsorption of H2O/D2O as well as C
H2Br2 in conjunction with small-angle scattering of neutrons and X-ray
s, respectively. For dry samples. the data indicates a fractal surface
with a fractal dimension D similar to 2.6. After the deposition of an
adsorbed film, defractalization is observed. However, this procedure
is different for H2O and CH2Br2. It is suggested that H2O yields a sof
t hydrogel on the Vycor surface. Theoretical considerations on the mor
phology of the pore structure as well as the surface geometry are give
n in terms of two-dimensional fractal configurations.