High purity silica monoliths and process for the synthesis thereof
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United States of America Patent
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Oct 22, 2013
Grant Date -
Aug 18, 2011
app pub date -
Oct 1, 2009
filing date -
Oct 9, 2008
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Abstract
The process for the synthesis of a silica monolith comprises the following steps:
- hydrolysis of a silicon alkoxide in order to form a hydrolysis precursor followed by a condensation of said hydrolysis precursor in the presence of an organic solvent, in the presence of water and of a basic catalyst in order to form oligomeric clusters containing several silicon atoms;dispersion of said oligomeric clusters in a solution in order to form a sol;polymerization of the sol in order to obtain a gel via a first heat treatment, at a temperature below the boiling point of the constituents of the sol;drying of the gel via a second heat treatment;conversion of the gel to a xerogel via a third heat treatment;dehydration and densification of the xerogel until the silica monolith is obtained via a fourth heat treatment.
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