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Surface free energies and steam stability of methyl-modified silica membranes

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Abstract

Methyl-modified silica membranes have been prepared by acid-catalyzed co-hydrolysis and condensation reactions of tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES). The surface wettability, micro-structure and gas permeance of the methyl-modified silica membranes were investigated. The values of dispersion force γ dS , dipole force γ PS and hydrogen bonding force γ hS to the surface tensions for the silica membranes were evaluated by the extended Fowkes equation. The surface free energy and surface wettability of the silica membranes decrease greatly with the increasing of MTES/TEOS ratio mainly because of the contribution of hydrogen bonding force. FTIR analysis shows that the reason is the increase of Si–CH3 group amount and the decrease of O–H group amount on the surfaces of silica membranes. After aging in steam circumstances, the increase of surface free energies results from the increase of O–H amount present on the silica membrane surfaces. The methyl ligands can make the mean pore size and total pore volume of silica membrane larger. Compared with the unmodified silica membrane, the gas permselectivities of the MTES-modified silica membranes have no obvious decrease in despite of the greatly increase of gas permeation rates. As the silica membranes are aged in steam circumstances, the decrease of gas permeation rates in the silica membrane with MTES/TEOS = 0 is far more than that in the silica membrane with MTES/TEOS = 0.8 while their H2/CO2 selectivities have no notable change.

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Acknowledgments

The authors are grateful for the financial support of the National Natural and Science Foundation Council of China 30571636 and 20877062, the Natural Science Foundation of Shanxi Province Education Office 05JK208, the Basic Research Foundation of Xi’an Polytechnic University XGJ08002 and the Doctoral Program of Higher Education of China 20060698002.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Jing Yang & Jierong Chen

  2. School of Environment and Chemistry Engineering, Xi’an Polytechnic University, Xi’an, 710048, China

    Jing Yang

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  1. Jing Yang
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Correspondence to Jierong Chen.

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Yang, J., Chen, J. Surface free energies and steam stability of methyl-modified silica membranes. J Porous Mater 16, 737–744 (2009). https://doi.org/10.1007/s10934-008-9256-1

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