Effects of catalytic acid and templating surfactant concentrations on mesostructure of submillimeter-thick mesoporous silica by solvent evaporation synthesis

Submillimeter-thick films of mesoporous silica were synthesized by the solvent evaporation method using tetraethoxysilane (TEOS) and cetyltrimethylammonium chloride (CTAC) as the silica source and the templating agent, respectively. The effects of HCl/TEOS and CTAC/TEOS molar ratios were investigate...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2001-11, Vol.49 (1), p.57-64
Main Authors: Nagamine, Shinsuke, Kurumada, Ken-ichi, Tanigaki, Masataka, Endo, Akira
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Mesoporous silica
Porous materials
Solvent evaporation method
Submillimeter-thick film
Surfactant
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Summary:Submillimeter-thick films of mesoporous silica were synthesized by the solvent evaporation method using tetraethoxysilane (TEOS) and cetyltrimethylammonium chloride (CTAC) as the silica source and the templating agent, respectively. The effects of HCl/TEOS and CTAC/TEOS molar ratios were investigated. It was revealed that a high CTAC concentration and a low gelation rate at a low HCl concentration were favorable for the formation of highly ordered mesostructures, since the mesostructure is governed by the concentration of CTAC at gelation of the solution. The pore diameter increased as the CTAC/TEOS ratio decreased, suggesting the intermediation between a silica wall and a CTAC micelle by a water layer whose thickness increases with the increase in the H 2O/CTAC ratio.
ISSN:1387-1811
1873-3093
DOI:10.1016/S1387-1811(01)00403-6