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An ultra-fast
sol-gel process has been developed to get high content silica materials,in which,the
solvent tetrahydrofuran(THF) for hydrolysis of precursor tetraethyl orthosilicate,was
removed through solvent extraction to obtain bulk sol.The bulk sol can be molded in
different shapes such as discoid,pellet,octagon,cylinder,and half-sphere.They solidified
and gelled in a very short time in the presence of lithium salt.Measurements show that the
silica monoliths possess volume shrinkage of 52%,high silica content of 82.4% and
transmittance of 70% in the UV/Vis region,and are crack-free indefinitely. 相似文献
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