Abstract
Nitrogen adsorption method, together with small angle X-ray scattering (SAXS) technique, has been employed to analyze the pore surface characteristics of macroporous silica gels with micrometer-range interconnected morphology. Broad variations were observed in the specific surface area and pore-size distribution of heat-treated gels as a consequence of soaking treatments, in the wet state, in several kinds of organic solvents or in aqueous solutions with various pHs. These effects could be related to the swelling phenomenon of loosely cross-linked structural units of silica network analogous to that well-known for organic polymer systems.
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