论文标题
MOF整体的断裂行为，纳米凹和纳米裂纹揭示了
Fracture behavior of MOF monoliths revealed by nanoindentation and nanoscratch
论文作者
论文摘要
整体金属有机框架（MOF）代表了由于其结构稳定性，用于这种新兴类别的多功能材料的工业实施解决方案。与MOF粉末相比，整体表现出其他有趣的特性，例如分层孔隙率，可显着提高体积吸附能力。 MOF整体的机械表征在其工业扩张中起着关键作用，但到目前为止，几个关键方面尚不清楚。特别是，尚未探索MOF巨石的断裂行为。在这项工作中，我们研究了四个原型MOF巨石中的裂纹的启动和传播，即ZIF-8，HKUST-1，MIL-68和MOF-808。我们观察到接触区域内的剪切故障代表MOF巨石的主要故障机理，并且是径向裂纹的来源。 MIL-68和MOF-808表现出对开裂的高度抗性，这可以归因于其固结纳米结构。
Monolithic metal-organic frameworks (MOFs) represent a promising solution for the industrial implementation of this emerging class of multifunctional materials, due to their structural stability. When compared to MOF powders, monoliths exhibit other intriguing properties like hierarchical porosity, that significantly improves volumetric adsorption capacity. The mechanical characterization of MOF monoliths plays a pivotal role in their industrial expansion, but so far, several key aspects remain unclear. In particular, the fracture behavior of MOF monoliths has not been explored. In this work, we studied the initiation and propagation of cracks in four prototypical MOF monoliths, namely ZIF-8, HKUST-1, MIL-68 and MOF-808. We observed that shear faults inside the contact area represent the main failure mechanism of MOF monoliths and are the source of radial cracks. MIL-68 and MOF-808 showed a remarkably high resistance to cracking, which can be ascribed to their consolidated nanostructure.
