通过在蒸汽阶段透AlO的水来修改无机结构 H 混合膜:对溶剂稳定性,透性和选择性的影响
Benjamin C Jean1, Yi Ren1, Ian Slagle1
1School of Materials Science and Engineering and School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
概括
蒸汽阶段透 (VPI) 使用氧化网络创建稳定的有机膜. 这些网络的后处理调整可以控制膜性能,而不会牺牲溶剂稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 蒸汽阶段透 (VPI) 增强有机溶剂中的有机膜稳定性.
- 了解VPI处理膜中的无机结构对于优化有机溶剂逆透 (OSRO) 至关重要.
研究的目的:
- 使用VPI阐明PIM-1膜内由氧化氧化形成的无机集群结构.
- 研究后加工技术对无机结构和膜性质的影响.
主要方法:
- 射线吸收光谱 (XAS),包括射线吸收近边缘结构 (XANES) 和扩展射线吸收细结构 (EXAFS).
- X射线光电子光谱 (XPS) 分析H2O比率和协调.
- 分析AlK边缘EXAFS以确定第一个和第二个外协调号码.
主要成果:
- 氧化氧化在PIM-1膜中形成非线性,网络结构.
- 第一个外中占主导地位的六坐标和第二个外中占主导地位的三个Al原子表明了更大的集群形成.
- 后处理 (脱水/再水) 有效地控制了网络结构,透率和选择性.
结论:
- 这项研究揭示了PIM-1中氧化在VPI过程中形成的详细无机结构.
- 通过后处理进行网络结构控制,为OSRO应用程序量身定制膜性能提供了一条途径.
- 经过VPI处理的膜表现出强大的溶剂稳定性,具有可调节的特性.
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