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Amorphization of metal-organic framework MOF-5 at unusually low applied pressure

机译:金属有机骨架MOF-5在异常低的施加压力下的非晶化

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摘要

So far, amorphization of solid materials at ambient temperature required a high pressure (several gigapascal). This raises an important question: is it possible to induce amorphization of solid materials by a low pressure at ambient temperature? Herein, our x-ray diffraction measurements demonstrated that Zn_4O(BDC)_3 metal-organic framework (MOF-5) can be irreversibly amorphized at ambient temperature by employing a low compressing pressure of 3.5 MPa, which is 100 times lower than that required for amorphization of other solids. This was further supported by the collapse of pores. Furthermore, the Raman spectra indicated that the irreversible pressure-induced amorphization (PIA) was due to the destroying of some carboxylate groups. One can conclude that the availability of thousands of MOFs can allow ones to reveal relationships between structures and PIA at a low pressure.
机译:到目前为止,固体材料在环境温度下的非晶化需要高压(几吉帕斯卡)。这就提出了一个重要的问题:在环境温度下是否可以通过低压诱导固体材料非晶化?在这里,我们的X射线衍射测量表明,通过在环境温度下采用3.5 MPa的低压缩压力,可以使Zn_4O(BDC)_3金属有机骨架(MOF-5)不可逆地非晶化,该压力比要求的低100倍。其他固体的非晶化。孔的破裂进一步支持了这一点。此外,拉曼光谱表明不可逆的压力诱导的非晶化(PIA)是由于一些羧酸根基团的破坏。可以得出结论,成千上万的MOF的可用性可以使人们在低压下揭示结构与PIA之间的关系。

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