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- W2076411459 abstract "This paper presents structural and mechanical characterizations of microporous silica membranes for gas separation. The membrane separative layer is made of microporous silica–B2O3 produced via a sol–gel process. This layer of about 200 nm of thickness is deposited on the internal surface of a tubular asymmetric γ-alumina/α-alumina support. FTIR and Raman analyses indicate the presence of the boron in the silica net and the above methods in conjunction with 11B MAS NMR analyses of the samples indicate that boron is located mainly in the tetrahedral framework position. Such membranes present interesting gas separation properties at temperatures up to 500 °C and transmembrane pressures lower than 8 bar. He permeance values close to 10−10 kmol m−2 s−1 Pa−1 are obtained, associated with ideal selectivity α(He/CO2) which can reach 55. Mechanical properties of separative silica-modified layers are measured by nanoindentation and the coefficient of thermal expansion is obtained from pure material." @default.
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- W2076411459 date "2009-01-01" @default.
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- W2076411459 title "Structural and mechanical characterizations of microporous silica–boron membranes for gas separation" @default.
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- W2076411459 doi "https://doi.org/10.1016/j.memsci.2008.10.052" @default.
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