Synthesis of microporous silica gel and glass particles in W/O emulsion
- Ehime Univ., Matsuyama-shi (Japan)
Spherical porous silica gels and glasses are synthesized by the sol-gel process in W/O emulsions. The pore size of the silica gels can be controlled within the region of mesopore to macropore by changing compositions of the starting solutions; thus, tetramethoxysilane (TMOS), polyethyleneglycol (PEG), H{sub 2}O and organic solvent. The interconnected pore structure of the gels can be made by eliminating PEG from gel bodies. Such PEG originates by phase separation between the PEG and the polymerizing silica in common solvents. The pore diameter increases with an increase in molecular weight of PEG when the mole ratio of PEG as monomer unit to TMOS is fixed to 0.3. The pore diameter decreases and specific surface area increases with an increase in the content of PEG having molecular weight of 50,000 when [PEG]/[TMOS] mole ratio is greater than 0.3. For silica glass particles, the pore size can be controlled in the region of mesopore by changing temperature of thermal treatment of sodium borosilicate glasses. Average diameter of silica gels and glasses are 15 and 40 {mu}m, respectively.
- OSTI ID:
- 99117
- Report Number(s):
- CONF-940911--
- Country of Publication:
- United States
- Language:
- English
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