金属有机框架玻璃的可塑性
Remo N Widmer1, Alice M Bumstead2, Manish Jain1
1Empa-Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, 3602 Thun, Switzerland.
Journal of the American Chemical Society
|December 2, 2021
概括
金属有机框架 (MOF) 玻璃具有显著的可塑性,挑战传统玻璃的脆性. 这些新的MOF玻璃具有广泛的变形,可用于结构应用.
科学领域:
- 材料科学
- 固态化学
背景情况:
- 玻璃通常是易碎的,限制了其作为结构材料的使用.
- 金属有机框架 (MOF) 具有独特的化学和结构特性.
- MOF玻璃提供了克服传统玻璃脆弱性的机会.
研究的目的:
- 研究MOF玻璃的机械性能.
- 在单轴压缩下确定MOF玻璃的可塑性和变形机制.
- 评估延展率对MOF玻璃机械行为的影响.
主要方法:
- 进行了依赖应变速率的单轴微柱压缩实验.
- 测试了三系列具有不同链接分子的MOF玻璃 (agZIF-62,agZIF-UC-5和agTIF-4).
- 在一系列的应变速率中测量了度强度和塑性变形.
主要成果:
- MOF玻璃表现出显著的可塑性,在近静态速度下变形高达35%.
- 收益强度随着应变率的增加而增加,对于一个gZIF-62的灵敏度为m=0.024.
- 无论使用哪种特定的替代链接分子,都观察到可塑性.
结论:
- 结构密度是MOF玻璃中观察到的广泛可塑性的主要机制.
- 这些发现挑战了与眼镜相关的固有脆性.
- MOF玻璃显示出作为坚固结构材料的潜力.
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