Effects of catalytic acid and templating surfactant concentrations on mesostructure of submillimeter-thick mesoporous silica by solvent evaporation synthesis
Effects of catalytic acid and templating surfactant concentrations on mesostructure of submillimeter-thick mesoporous silica by solvent evaporation synthesis
复制标题
DOI：
10.1016/s1387-1811(01)00403-6
复制
发表时间：
2001-11-15
影响因子：
5.2
通讯作者：
Endo, A
中科院分区：
文献类型：
--
作者：
Nagamine, S;Kurumada, K;Endo, A
以四乙氧基硅烷（TEOS）为硅源，十六烷基三甲基氯化铵（CTAC）为模板剂，采用溶剂蒸发法制备了亚毫米厚介孔二氧化硅薄膜。考察了HCl/TEOS和CTAC/TEOS摩尔比的影响。结果表明，高CTAC浓度和低HCl浓度下的低胶凝速率有利于形成高度有序的介观结构，因为介观结构受溶液胶凝时CTAC浓度的支配。孔径随着CTAC/TEOS比的减小而增大，说明硅壁与CTAC胶束之间存在水层的中介作用，水层的厚度随着H2O/CTAC比的增大而增大。(C) 2001 Elsevier Science B.V.版权所有
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 H2O/CTAC ratio. (C) 2001 Elsevier Science B.V. All rights reserved.