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- W109447111 abstract "Silica and cobalt-doped silica membranes were successfully prepared to study the permeation mechanism of gas molecules, focusing particularly on helium, hydrogen, water vapor, and ammonia in the 300–500 °C temperature range. The results are discussed based on the activation energy of permeation and the selectivity of gaseous molecules. The activation energy of H2 permeation correlated well with the He/H2 permeance ratio for porous silica membranes prepared by sol–gel processing, as well as chemical vapor deposition (CVD), indicating that similar amorphous silica network structures were formed. Kinetic diameters of H2O and NH3 may be too large for permeation through amorphous silica networks. The dimensions of H2O with molecular size of 0.2995, 0.317 nm and NH3 with size 0.326 nm were in good agreement with experimentally obtained permeances using microporous silica membranes and were clearly independent of the average pore size of the membranes, suggesting that the order of molecular sizes through amorphous silica membranes is He (0.26 nm) < H2 (0.289 nm) < H2O (0.2995, 0.317 nm) < NH3 (0.326 nm) < N2 (0.364 nm)." @default.
- W109447111 created "2016-06-24" @default.
- W109447111 creator A5028897025 @default.
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- W109447111 date "2011-01-01" @default.
- W109447111 modified "2023-10-16" @default.
- W109447111 title "Gas Permeation Properties of Helium, Hydrogen, and Polar Molecules Through Microporous Silica Membranes at High Temperatures" @default.
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- W109447111 doi "https://doi.org/10.1016/b978-0-444-53728-7.00006-9" @default.
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