New route for producing crack-free xerogels: Obtaining uniform pore size
- 作者：Marí ; a J. Mosquera ; Desireé ; M. de los Santos ; Lucila Valdez-Castro ; Luis Esquivias
- 关键词：Organic– ; inorganic hybrids ; Sol– ; gels (xerogels)
- 刊名：Journal of Non-Crystalline Solids
- 出版年：2008
- 期刊代码：50_00223093
- 类别：ms
- 出版时间：15 January 2008
- 卷：354
- 期：2-9
- 页码：645-650
- 文件大小：393 K
摘要
We propose an innovative strategy to obtain crack-free gels by using a surfactant as a template for the silica pores. We use a neutral surfactant – n-octylamine – which weakly interacts by hydrogen bonding with the silica precursor. This allows it to be removed by simple drying in ambient air. We investigate the effect of the surfactant in simple inorganic silica obtained from tetraethoxysilane (TEOS) and an organic–inorganic hybrid xerogel, containing TEOS and polydimethylsiloxane (PDMS), as precursors. Although both the syntheses promote the formation of a crack-free uniform mesoporous silica gel, the hybrid gel network exhibits a larger pore size than the gel containing exclusively the silica from TEOS.