期刊
JOURNAL OF CHEMICAL PHYSICS
卷 157, 期 10, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0109885
关键词
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资金
- Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules
- Postdoctoral Science Foundation of China
- Fundamental Research Funds for the Central Universities
- National Thousand Young Talents Program of China
- National Science Fund for Distinguished Young Scholars of China
- Natural Science Foundation of China
- BAGUI talent program
- [020017399]
- [106017467]
- [2018KFYXKJC009]
- [21525101]
- [22171075]
- [2019AC26001]
This paper presents a new method for glass formation, utilizing mechanical vibration to facilitate the melting of metal-organic frameworks at lower temperatures and produce glass with unique properties. Experimental results show that the vibrated glass material exhibits a lower glass transition temperature, improved gas accessible porosity, and pronounced short-to-medium range structures compared to conventionally melt-quenched glass.
A new glass forming method is essential for broadening the scope of liquid and glassy metal-organic frameworks due to the limitations of the conventional melt-quenching method. Herein, we show that in situ mechanical vibration can facilitate the framework melting at a lower temperature and produce glassy metal-organic frameworks (MOFs) with unique properties. Using zeolitic imidazolate framework (ZIF)-62 as a concept-proofing material, in situ mechanical vibration enables low-temperature melting at 653 K, far below its melting point (713 K). The resultant vibrated ZIF-62 glass exhibited a lower glass transition temperature of 545 K, improved gas accessible porosity, and pronounced short-to-medium range structures compared to the corresponding melt-quenched glass. We propose that vibration-facilitated surface reconstruction facilitates pre-melting, which could be the cause of the lowered melting temperature. The vibration assisted method represents a new general method to produce MOF glasses without thermal decomposition. (C) 2022 Author(s).
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