Ashling Christopher W, Lampronti Giulio I, Southern Thomas J F, Evans Rachel C, Bennett Thomas D
Department of Materials Science and Metallurgy, University of Cambridge, CambridgeCB3 0FS, U.K.
Department of Earth Sciences, University of Cambridge, CambridgeCB2 3EQ, U.K.
Inorg Chem. 2022 Nov 21;61(46):18458-18465. doi: 10.1021/acs.inorgchem.2c02663. Epub 2022 Nov 8.
Metal-organic framework crystal-glass composites (MOF CGCs) are a class of materials comprising a crystalline framework embedded within a MOF glass matrix. Herein, we investigate the thermal expansion behavior of three MOF CGCs, incorporating two flexible (MIL-53(Al) and MIL-118) and one rigid (UL-MOF-1) MOF within a ZIF-62 glass matrix. Specifically, variable-temperature powder X-ray diffraction data and thermomechanical analysis show the suppression of thermal expansivity in each of these three crystalline MOFs when suspended within a ZIF-62 glass matrix. In particular, for the two flexible frameworks, the average volumetric thermal expansion (β) was found to be near-zero in the crystal-glass composite. These results provide a route to engineering thermal expansivity in stimuli-responsive MOF glass composites.
金属有机框架晶体-玻璃复合材料（MOF CGCs）是一类材料，由嵌入MOF玻璃基质中的晶体框架组成。在此，我们研究了三种MOF CGCs的热膨胀行为，它们在ZIF-62玻璃基质中包含两种柔性（MIL-53(Al)和MIL-118）和一种刚性（UL-MOF-1）MOF。具体而言，变温粉末X射线衍射数据和热机械分析表明，当这三种晶体MOF悬浮在ZIF-62玻璃基质中时，其热膨胀率受到抑制。特别是，对于两种柔性框架，在晶体-玻璃复合材料中发现平均体积热膨胀（β）接近零。这些结果为在刺激响应性MOF玻璃复合材料中设计热膨胀率提供了一条途径。
