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• W1996351390 abstract "To develop hydrophobic ceramic membranes, the permeability of liquids (water, ethanol, hexane, and CO2(l)) and gases (CO2 and N2) were examined in unmodified and surface-modified 1 kDa titania and 5 nm γ-alumina membranes. Octyltrichlorosilane (Cl3SiC8H17) and its fluorinated analog trichloroperfluorooctylsilane (Cl3SiC2H4C6F13) were chosen as modifying agents. SEM/EDS analysis revealed tri-bonding of the silanes to both materials with no evidence of a thick polymerized surface layer. Characterization by CO2 and N2 gas permeability indicated Knudsen diffusion in all membranes with minimal CO2 selectivity, except for 5 nm C8F (CO2/N2 = 2.6) where a surface-flow mechanism was apparent. In contrast, surface modification yielded significant solvent- and modifier-dependent differences in liquid permeability. For example, hexane exhibited the greatest permeability in the C8H mesoporous titania and γ-alumina membranes, while liquid CO2 (fluorophilic) permeability was the greatest with the C8F membranes. As expected, the hydrophobic C8F membranes were impermeable to water. Low gas and liquid permeabilities in the C8F-modified membranes were consistent with large transport resistances due to the bulky fluorinated tails. These results demonstrate that silane surface modification can be used to tailor liquid transport behavior and improve apolar solvent flux in ceramic membranes relative to polar solvents. In addition, these membranes have proven amenable to liquid CO2, a green solvent alternative." @default.
• W1996351390 created "2016-06-24" @default.
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• W1996351390 date "2007-09-01" @default.
• W1996351390 modified "2023-10-14" @default.
• W1996351390 title "Role of tail chemistry on liquid and gas transport through organosilane-modified mesoporous ceramic membranes" @default.
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• W1996351390 doi "https://doi.org/10.1016/j.memsci.2007.06.011" @default.
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