Pore Structure and Hydrophobic Property of Ethylene-modified Microporous Silica Membranes

doi:10.3724/SP.J.1077.2007.00949

Abstract

Abstract: Ethylene-modified microporous silica membranes were prepared by acid catalysed cohydrolysis and condensation reaction of tetraethylorthosilicate(TEOS) and ethylenetriethoxysilane (TEVS) in ethanol and characterized by means of N₂ adsorption, TG, NMR and contact angle meter. The results show that the modified materials remain a desirable microporous structure with a
pore width centered at 0.5--0.7nm, and that the hydrophobic property of modified silica membranes is considerably improved due to the gradual replacement of hydrophilic silanol by hydrophobic ethylene on the surface with increasing molar ratio of TEVS/TEOS.

Key words: silica membranes, ethylene, pore structure, hydrophobic property, sol-gel process

CLC Number:

O484

WANG Yan-Li,WEI Qi,YU Chun-Xiao,LI Qun-Yan,NIE Zuo-Ren. Pore Structure and Hydrophobic Property of Ethylene-modified Microporous Silica Membranes[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00949.

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Pore Structure and Hydrophobic Property of Ethylene-modified Microporous Silica Membranes

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