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首页> 外文期刊>RSC Advances >Plasma-assisted multi-layered coating towards improved gas permeation properties for organosilica membranes
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Plasma-assisted multi-layered coating towards improved gas permeation properties for organosilica membranes

机译：等离子辅助多层涂层，可改善有机硅膜的透气性

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Hydrophobic silica membranes for gas separation are proposed to achieve high gas permeation properties in the presence of water vapor. Hydrophobic Me-SiO2 sols were prepared by using tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMS) as co-precursors, coated on macroporous alpha-Al2O3 supports through multi-layered coatings to form an intermediate layer with pore size of approximately 2 nm. H2O vapor plasma was used for the modification of a hydrophobic Me-SiO2 intermediate layer by generating hydrophilic groups on the surface without changing either the bulk hydrophobicity or the pore size. After plasma treatment of the Me-SiO2 layers, bis(triethoxysilyl) ethane (BTESE)- or bis(triethoxysilyl) octane (BTESO)-derived sols were coated as separation layers. The gas selectivity for BTESE membrane was improved after water plasma treatment, which allowed better adhesion between each layer via the enhanced hydrophilic modification by water plasma. Under wet conditions, the CO2 permeance for both membranes were decreased, a slightly larger decrease than for membranes without plasma treatment, but much less than the BTESE and BTESO membranes prepared on hydrophilic SiO2-ZrO2 intermediate layers. High gas permeation properties were obtained in the presence of water for organosilica membranes prepared from hydrophobic top layers to hydrophobic intermediate layers via plasma-assisted multi-layered coatings.
机译：提出了用于气体分离的疏水性二氧化硅膜，以在水蒸气存在下实现高的气体渗透性能。疏水性Me-SiO2溶胶是通过使用四乙氧基硅烷（TEOS）和甲基三甲氧基硅烷（MTMS）作为共前体制备的，并通过多层涂层涂覆在大孔α-Al2O3载体上，形成孔径约为2 nm的中间层。通过在表面上产生亲水基团而不改变整体疏水性或孔径，将H 2 O蒸气等离子体用于疏水Me-SiO 2中间层的改性。在对Me-SiO2层进行等离子处理后，将双（三乙氧基甲硅烷基）乙烷（BTESE）或双（三乙氧基甲硅烷基）辛烷（BTESO）衍生的溶胶作为隔离层进行涂覆。水等离子体处理后，BTESE膜的气体选择性得到改善，通过水等离子体增强的亲水性改性，使各层之间的附着力更好。在潮湿条件下，两个膜的CO2渗透率均降低，比未进行等离子体处理的膜的CO2渗透率略大，但比在亲水性SiO2-ZrO2中间层上制备的BTESE和BTESO膜要少得多。在存在水的情况下，有机硅膜具有高的透气性，该有机硅膜是通过等离子辅助多层涂层从疏水顶层到疏水中间层制备的。

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