稳定超冷液体和冷却玻璃的金属有机框架的协同刺激
Zheng Yin1,2,3, Yingbo Zhao4, Shuang Wan2
1State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, P. R. China.
Journal of the American Chemical Society
|June 24, 2022
概括
研究人员开发了一种新的方法,通过诱导结构障碍来制造金属有机框架 (MOF) 玻璃. 这种工艺可以产生稳定的MOF玻璃,在材料科学中具有潜在的应用.
科学领域:
- 材料科学
- 固态化学
- 玻璃科学
背景情况:
- 金属有机框架 (MOF) 是具有多种应用的晶体多孔材料.
- 由于MOF的热不稳定性和有限的加工方法,MOF的玻璃化具有挑战性.
- 现有的MOF玻璃很少,阻碍了更广泛的研究和应用.
研究的目的:
- 开发一种新有效的合成金属有机框架玻璃的方法.
- 在特定的MOF中研究超冷液相的形成和特性.
- 创建有孔的MOF玻璃,保持框架的完整性.
主要方法:
- 将蒸汽水化和热脱水的协同刺激应用于相互透的β-净MOF.
- 诱导结构障碍以促进超冷液体的形成.
- 灭超冷的液体形成玻璃状的状态.
- 通过EXAFS和PDF分析对得到的材料进行表征.
主要成果:
- 在MOF中形成的稳定超冷液相,在26K范围内稳定超过10^4s.
- 达到560K的玻璃过渡温度 (Tg),远低于695K的分解温度.
- 生产的多孔MOF玻璃与完整的框架连接.
结论:
- 协同蒸汽水化和热脱水是MOF玻璃化的一种可行的方法.
- 这种方法可以从加热时分解的材料中制造MOF玻璃.
- 开发的MOF玻璃具有先进材料应用的前景.
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