基于天然C4连接器的金属有机框架的工程结构动力学
Sujing Wang1,2, Nertil Xhaferaj1, Mohammad Wahiduzzaman3
1UMR 8004 CNRS, Ecole Normale Supérieure, Ecole Supérieure de Physique et de Chimie Industrielles de Paris, PSL Université , Institut des Matériaux Poreux de Paris , 75005 Paris , France.
Journal of the American Chemical Society
|October 9, 2019
概括
研究人员设计了柔性金属有机框架 (MOF),使用混合硬质和软质连接器来增强气体分离. 这种新的方法优化了二氧化碳/混合物的工作能力和选择性.
科学领域:
- 材料科学
- 化学工程
- 纳米技术
背景情况:
- 在先进的分离应用中,金属有机框架 (MOF) 的工程结构灵活性至关重要,但仍然具有挑战性.
- 现有的MOF材料往往缺乏对温度或客分子等外部刺激的可调节的动态反应.
研究的目的:
- 通过混合硬质和软质连接器来实现MOF的可调节结构灵活性.
- 研究MOFs对外部刺激的动态行为,并将其与链接特征相关联.
- 发现多变量灵活的MOF,可提高气体分离的性能.
主要方法:
- 合成了一系列稳定,同结构的基于的MOF (Zr-MOF),使用具有不同灵活性的天然C4链接剂 (酸,酸,酸).
- 使用全面的"现场"特征来分析链接键拉伸,曲自由度和MOF动态反应.
- 评估了开发的MOF的气体分离性能,特别是CO2/N2选择性和工作能力.
主要成果:
- 在Zr-MOF中表现出独特的响应动态,基于内置链接器的固有灵活性.
- 建立了一个清晰的关联链接符和MOF的动态行为.
- 发现了多变量灵活的MOF,具有高工作能力和显著增强的CO2/N2选择性的最佳平衡.
结论:
- 混合硬和软链接器提供了一个可行的策略,用于在MOF中设计可调的结构灵活性.
- 发现的多变量柔性MOF为高效的CO2/N2分离提供了一个有前途的平台.
- 这种方法为改善微孔MOF对各种气体和液体混合物的分离能力开辟了新的途径.
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