Ultrathin polyorganosilica membranes synthesized by oxygen-plasma treatment of polysiloxanes for H2/CO2 separation

Ultrathin polyorganosilica membranes synthesized by oxygen-plasma treatment of polysiloxanes for H2/CO2 separation
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用于 H2/CO2 分离的聚硅氧烷氧等离子体处理合成的超薄聚有机硅膜

DOI:
10.1016/j.memsci.2023.122099
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发表时间:
2023
影响因子:
9.5
通讯作者:
Zhang, Yugang
Zhang, Yugang
中科院分区:
工程技术1区
文献类型:
--
作者:
Bui, Vinh;Satti, Varun R.;Haddad, Elizabeth;Hu, Leiqing;Deng, Erda;Zhu, Lingxiang;Lee, Won-Il;Yin, Yifan;Kisslinger, Kim;Zhang, Yugang

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聚二甲基硅氧烷(PDMS)的氧等离子体处理在PDMS膜的顶部上诱导了一个可固化的聚有机硅(POSi)层(<10 nm),导致优异的H2/气体分离性能,并提供了一种快速和可扩展的方法来制造坚固的二氧化硅膜,与传统的高温和耗时的溶胶-凝胶方法相比。在这里,我们彻底调查POSi膜衍生自聚(二甲基硅氧烷-co-甲基羟基硅氧烷)(聚(DMS-co-MHOS))含有-SiOH基团,可以更容易地转化为二氧化硅网络比-SiCH 3在PDMS中。的聚硅氧烷的结构和等离子体处理条件(包括等离子体产生功率,氧气流量,腔室压力,和处理时间)上的二氧化硅化学,结构和H2/CO2分离性能的影响进行了系统的确定,以获得结构/性能关系。优化的膜在150 °C下表现出880 GPU的H2渗透性和67的H2/CO2选择性,上级最先进的聚合物膜。当在150 °C下用含有2.8mol%水蒸气的模拟合成气挑战时,膜保持H2/CO2选择性高达46,证明了这些POSi膜用于实际应用的潜力。
Oxygen plasma treatment of polydimethylsiloxane (PDMS) induces an ultrathin polyorganosilica (POSi) layer (<10 nm) on top of a PDMS membrane, leading to excellent H2/gas separation properties and providing a rapid and scalable way to fabricate robust silica membranes compared with conventional high-temperature and time-consuming sol-gel methods. Here, we thoroughly investigate POSi membranes derived from poly (dimethylsiloxane-co-methylhydroxidesiloxane) (poly (DMS-co-MHOS)) containing -SiOH groups that can be more easily converted to silica networks than the -SiCH3in PDMS. The effect of the polysiloxane structure and plasma treatment conditions (including plasma generating powers, oxygen flowrate, chamber pressure, and treatment time) on the silica chemistry, structure, and H2/CO2separation properties are systematically determined to derive structure/property relationships. An optimized membrane exhibits H2permeance of 880 GPU and H2/CO2selectivity of 67 at 150 °C, superior to state-of-the-art polymeric membranes. The membrane retains H2/CO2selectivity as high as 46 when challenged with simulated syngas containing 2.8 mol% water vapor at 150 °C, demonstrating the potential of these POSi membranes for practical applications.
DOI: 10.1021/ja806762q
发表时间: 2009-01-21
影响因子: 15
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期刊: Advances in Materials
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