Pore-size-controlled silica membranes with disiloxane alkoxides for gas separation
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| Title: | Pore-size-controlled silica membranes with disiloxane alkoxides for gas separation |
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| Authors: | Lee, Hye Ryeon1, Shibata, Toshinobu1, Kanezashi, Masakoto1, Mizumo, Tomonobu2, Ohshita, Joji2, Tsuru, Toshinori1 tsuru@hiroshima-u.ac.jp |
| Source: | Journal of Membrane Science. Nov2011, Vol. 383 Issue 1/2, p152-158. 7p. |
| Subjects: | Porous silicon, Silica, Artificial membranes, Siloxanes, Alkoxides, Separation of gases |
| Abstract: | Abstract: Pore-size-controlled silica membranes were prepared using hexaethoxy disiloxane (HEDS) by a “spacer” technique, which is a novel strategy to control the pore size of silica membranes using bridged alkoxides. HEDS-derived silica gel powders prepared with acid and base catalysts were microporous and mesoporous, respectively. HEDS-derived silica membranes prepared from HCl-catalyzed sol showed high H2 permeance (0.73–2.0×10−6 molm−2 s−1 Pa−1) with low H2/N2 (∼20) and high H2/SF6 perm-selectivity (∼2000). Pore size by single gas permeation and normalized Knudsen-based permeance (NKP) showed that silica membranes with bridged alkoxides had a loose amorphous silica structure. Judging from NKP fitting curves for tetraethylorthosilicate (TEOS), HEDS, tetraethoxydimethyl disiloxane (TEDMDS), and bis(triethoxysilyl) ethane (BTESE)-derived silica membranes, the order was TEOS |
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| Database: | Engineering Source |
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