用电场对软多孔金属有机框架进行除振
A Knebel1, B Geppert2, K Volgmann2
1Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, 30167 Hannover, Germany. juergen.caro@pci.uni-hannover.de alexander.knebel@pci.uni-hannover.de.
Science (New York, N.Y.)
|October 21, 2017
概括
对金属有机框架膜 (MOF) 施加电场可以切换气体传输. 这种由电场引起的ZIF-8膜的结构变化通过加强晶格来增强分子选能力.
科学领域:
- 材料科学
- 化学工程
- 物理化学
背景情况:
- 金属有机框架 (MOF) 是具有调节性质的多孔材料.
- 通过MOF控制气体运输对于分离技术至关重要.
- 氧化伊米达酸框架ZIF-8是一种突出的MOF,在气体分离中具有潜在的应用.
研究的目的:
- 通过外部电场在ZIF-8膜中实地切换气体.
- 阐明电场引起的气体透变化的机制.
- 探索电场操纵增强分子选能力的潜力.
主要方法:
- 在直流电场抛光下测量气体透率.
- 进行X射线衍射和初始计算以确认结构变化.
- 介电光谱,极化和核磁共振研究以分析网格动力学.
主要成果:
- 使用电场实现了ZIF-8膜中气体透的可逆控制切换.
- 电场导致ZIF-8的结构转变为更为刚性的多态体.
- 网格硬化减少了气体输送,提高了分子选性.
- 电场偏振改变了低频格子运动和链接器动态.
结论:
- 外部电场可以动态控制MOF膜中的气体运输.
- 通过电场诱导的结构变化,ZIF-8膜具有可切换的气体透和增强的分子选.
- 这项工作为开发基于MOF的响应和可调节的分离系统开辟了新的途径.
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