H. Lee, M. Kanezashi, Tomohisa Yoshioka
May 1, 2010
Citations
0
Influential Citations
5
Citations
Journal
Desalination and Water Treatment
Abstract
Hybrid silica membranes were prepared using 1,1,3,3-tetraethoxy-1,3-dimethyldisiloxane (TEDMDS)as a silica precursor. Hybrid silica sol was synthesized by the acetic acid catalyzed hydrolysis and condensation of TEDMDS in ethanol as a solvent with different water molar ratio. Porous silica membranes were fabricated by coating the TEDMDS-derived hybrid silica sol, followed by drying and firing at 300°C or 450°C in nitrogen atmosphere. Single gas permeation characteristic of He, H2,N2, and SF6 through TEDMDS-derived silica membranes were measured at 200°C. It was found that TEDMDS-derived silica membranes had loose amorphous structure than TEOS-derived silica membranes. TEDMDS-derived silica membrane fired at 300°C using TEDMDS/H2O = 1/20 sol showed H2 permeance of 2.05 x 10−6 m3 m−2 s−1 kPa−1 with H2/SF6 selectivity of 260°C at 200°C. The water contact angles of TEDMDS-derived silica film were constant even after kept in humid atmosphere (60 RH%,40°C) for about 35 d, suggesting a hydrophobic property due t...