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摘要:
Methyl-modified mesoporous silica membranes were prepared by acid catalyzed co-hydrolysis and condensation reaction of tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) in the presence of triblock copolymer poly (ethylene glycol)-B-poly (propylene glycol)-B-poly (ethylene glycol) (P123) in ethanol. The pore structure and hydrophobic property of the final materials were characterized by Nitrogen adsorption, FTIR, Si-29 MAS NMR and contact angle meter. The results show that modified silica membranes have a desirable pore structure, with a pore size of 4.65 nm, a pore volume of 0.69 CM3.g(-1) and a BET surface area of 938.4 m(2).g(-1), and tend to be hydrophobic with a water contact angle of 109 degrees +/- 1.1 degrees, as the molar ratio of MTES/TEOS increases to 1.0. Gas permeability test suggests that the gas transport into the membranes is governed by Knudsen diffusion mechanism.
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来源 :
CHINESE JOURNAL OF INORGANIC CHEMISTRY
ISSN: 1001-4861
年份: 2007
期: 6
卷: 23
页码: 957-962
0 . 7 0 0
JCR@2022
ESI学科: CHEMISTRY;
JCR分区:4