Effect of Cosurfactants on Pore Size of Mesoporous Silica

Abstract

Abstract: Mesoporous silica was synthesized and templated by mixed micelles of cetyltrimethylammonium bromide(CTAB), n-pentanol or n-octylamine and nitric acid. The products were determined by small angle X-ray diffraction and N₂ gas adsorption desoption. The results show that pore size of mesoporous silica increased with increase of the molar ratio of CTAB to pentanol, while the pore size decreased with increase of the molar ratio of CTAB to n-octylamine. The reason is that micelle volume increased by addition of pentanol, resulting in the increase of the pore size of mesoporous silica, templated by the mixed micelles of CTAB, pentanol and nitric acid. However, there is bigger interaction between n-octylamin and silicate than that between CTAB and silicate in the mixed micelles of CTAB, n-octylamine and nitric acid, resulting in the decrease of the pore size of mesoporous silica.

Key words: Mesoporous silica, n Pentanol, n Octylamin, Pore size

CLC Number:

O648

TrendMD:

HAN Shu-Hua, HOU Wan-Guo, XU Jun, LI Zheng-Min. Effect of Cosurfactants on Pore Size of Mesoporous Silica[J]. Chem. J. Chinese Universities, 2004, 25(3): 509.

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Effect of Cosurfactants on Pore Size of Mesoporous Silica

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