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Autoclave thermal expansion

The first stage of SCD consists in autoclave heating. Both the solid part of the gel and solvent are heated. Several features are related to this thermal treatment. As above mentioned, syneresis phenomenon takes place and the solid shrinks. On the other hand, the liquid expands. The solvent located outside the silica network moves as mentioned previously (see Section EXPERIMENTAL PROCEDURE). The solvent located within the pores tends to expand and consequently the liquid must escape from the solid network. However the silica framework is not expected to expand as a function of temperature according to the very low thermal expansion of amorphous sihca. [Pg.611]

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