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• W2042868549 abstract "The reverse selectivity of inorganic membranes can be enhanced by surface modification using long hydrocarbon chain silanes. Improvements in n-C4H10 selectivity of Vycor porous glass over N2 and CH4 were obtained by sequentially modifying it with a C18 monochlorosilane (OCS) followed by a C18 trichlorosilane (ODS). The membranes were tested for pure and mixed gases at different feed pressures. The dual-modified membranes have higher ideal, or pure-gas, selectivities than membranes modified using OCS alone. The n-C4H10/N2 and n-C4H10/CH4 ideal selectivities for the dual-modified membrane were 88 and 35, respectively, as compared to values of 13 and 7, respectively, for the OCS-modified membrane. Adsorption experiments showed an increase in the relative adsorption of n-C4H10 over N2 and CH4 after dual surface modification of Vycor glass. Nuclear magnetic resonance, X-ray photoelectron spectroscopy, and thermogravimetric analysis techniques were used to confirm the presence of silanes on the surface of the substrates. A high flux of n-butane was measured for a dual-modified membrane fabricated using a 5 nm pore diameter γ-alumina ultrafilter substrate. The mixed-gas n-butane permeance for this membrane was 2 × 10-4 cm3(STP) cm-2 cm Hg-1 s-1 (6.7 × 10-8 mol m-2 s-1 Pa-1)." @default.
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• W2042868549 date "2007-10-01" @default.
• W2042868549 modified "2023-09-23" @default.
• W2042868549 title "Dual-Surface-Modified Reverse-Selective Membranes" @default.
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• W2042868549 doi "https://doi.org/10.1021/ie070765g" @default.
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