Metal-organic frameworks (MOFs) have potential applications as energy absorbing materials for shock wave energy mitigation due to their nanoporosity. Here we have examined km/s laser-driven flyer plate impacts on a prototypical MOF, ZIF-8. We observed particle fragmentation and morphological changes in microcrystals of ZIF-8 at lower shock pressures (≈2.5 GPa), and amorphization and structural collapse at higher pressures (≈8 GPa). High-speed emission spectroscopy revealed that 50 ns after flyer plate impacts, an emission pulse was generated by ZIF-8 resulting from chemical bonds that were broken and subsequently reformed. MOFs may prove useful in the dissipation of shock wave energy through large structural changes (free volume collapse and endothermic bond breakage).

中文翻译：

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金属-有机框架中的冲击波化学

金属有机框架（MOF）由于其纳米多孔性而具有作为用于减轻冲击波能量的能量吸收材料的潜在应用。在这里，我们检查了 km/s 激光驱动飞行板对原型 MOF ZIF-8 的影响。我们观察到 ZIF-8 微晶在较低冲击压力 (≈2.5 GPa) 下的颗粒破碎和形态变化，以及在较高压力 (≈8 GPa) 下的非晶化和结构坍塌。高速发射光谱显示，在飞板撞击后 50 ns，ZIF-8 产生了一个发射脉冲，该脉冲由化学键断裂并随后重新形成。MOF 可能被证明可用于通过大的结构变化（自由体积坍塌和吸热键断裂）耗散冲击波能量。