Hydrophobic properties of plasma polymerized thin film gas selective membranes |
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| Institution: | 1. Heat Transfer and Fluid Flow Laboratory, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic;2. Zena Membranes s.r.o., Hudcova 56b, 62100 Brno, Czech Republic;3. Institute of Materials Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 612 00 Brno, Czech Republic;4. Energy Institute, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic;1. School of Metallurgy, Northeastern University, Shenyang 110819, PR China;2. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, PR China |
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| Abstract: | Hydrophobic gas separation membranes were prepared by a plasma polymerization process. Thin films of about 400–500 nm thickness deposited on porous Al2O3 substrates represent the composite membranes investigated. The permeation properties of the composites were examined by the pressure increase and an isobar method. Depending on the precursor composition and the plasma polymerization parameters, it is possible to prepare membranes with Knudsen-like or solution-diffusion controlled separation factors. Low plasma polymerization energy densities and a mixture of silico- and fluoro-organic precursors result in water/methane separation factors as low as αCH4H2O = 0.3 and high membrane permeabilities. Infrared analysis yields that the structure of the films is mainly determined by the silico-organic component. The fluoro-organic coprecursor causes a fluorination of methyl groups of the films as manifested by an infrared absorption band at 900-880 cm?1. |
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