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- W2553600239 abstract "Two new bridged alkoxysilanes, bis(triethoxysilylalkyl)-N,N′-oxalylureas (alkyl = methyl or n-propyl), bearing a highly rigid and polar oxalylurea unit in the bridges, were employed as precursors of bridged silica membranes. The gas and water separation performance of the membranes prepared from the precursors using the sol–gel process was investigated. Interestingly, the membrane properties depended on the alkyl chain length. The membrane containing methylene units (alkyl = methyl) was porous and rather hydrophilic but the other with longer propylene units (alkyl = n-propyl) was non-porous and more hydrophobic. High H2/SF6 gas permeance ratios of 3100 and 1700, and NaCl rejections of 89 and 85% for 2000 ppm aqueous NaCl were obtained using the membranes containing methyl and n-propyl, respectively. The membrane with alkyl = methyl also showed a high CO2/N2 permeance ratio of 20.6 at 50°C. These results indicate the potential applications of the membranes as gas and water separation materials. Copyright © 2015 John Wiley & Sons, Ltd." @default.
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- W2553600239 date "2015-03-26" @default.
- W2553600239 modified "2023-10-15" @default.
- W2553600239 title "Preparation and separation properties of oxalylurea-bridged silica membranes" @default.
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- W2553600239 doi "https://doi.org/10.1002/aoc.3311" @default.
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