Assembling Hybrid Energetic Materials with Controllable Interfacial Microstructures by Electrospray.
Assembling Hybrid Energetic Materials with Controllable Interfacial Microstructures by Electrospray.
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通过电喷雾组装具有可控界面微结构的杂化含能材料
DOI：
10.1021/acsomega.1c01371
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发表时间：
2021-07-06
期刊：
影响因子：
4.1
通讯作者：
Li G
中科院分区：
文献类型：
--
作者：
Chen L;Ru C;Zhang H;Zhang Y;Chi Z;Wang H;Li G
构建纳米蓄热体与有机炸药的杂化含能材料是调控含能材料反应活性的有效策略。为了研究界面微结构在决定HEMs反应性中的作用，我们采用电喷雾技术，将Al/CuO和六硝基六氮杂异伍兹烷（CL-20）从不同的溶剂体系中组装成具有不同形貌的复合材料.通过扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）证实了从酮、酯或醇和醚的混合物获得的组装的粘土状或颗粒状HEMs的形态和组成信息。利用傅里叶变换红外光谱（FTIR）研究了CL-20由于荷电液滴快速蒸发和重结晶时间不足而引起的相变。采用热重-差示扫描量热法（TG-DSC）研究了纳米热敏炸药与高能炸药的热力学行为及协同效应。燃烧性能和增压特性的增强作为喷涂的HEMs已观察到通过开放燃烧试验和压力电池测试。颗粒状高分子材料具有较高的产气率和增压速率，而硝化纤维素（NC）纤维的存在会在一定程度上削弱其反应活性。由正丙醇和乙醚混合物制备的HEMs中，纳米CL-20以独立颗粒而不是基体形式存在，表现出高的气体产生但低的加压速率。结果表明，所制备的HEMs的能量释放性能可以通过构建不同的界面微结构来调节，以满足广泛的能源需求。
Constructing hybrid energetic materials (HEMs) consisting of nanothermites and organic high explosives is an efficient strategy to regulate the reactivity of energetic composites. To investigate the role of interfacial microstructures in determining the reactivity of HEMs, we employ electrospray, one ramification of electrohydrodynamic atomization, to assemble Al/CuO and hexanitrohexaazaisowurtzitane (CL-20) into composites with various morphologies from different solvent systems. The morphology and compositional information of the assembled clay-like or granular HEMs, which are obtained from ketone, ester, or mixtures of alcohol and ether, are confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The phase transition of CL-20 due to the fast evaporation of charged droplets and insufficient time for recrystallization is studied by Fourier transform infrared spectroscopy (FTIR). Thermogravimetric-differential scanning calorimetry (TG-DSC) is applied to investigate the thermodynamic behaviors and synergistic effect of the nanothermite and high explosive. Enhancements in combustion performance and pressurization characteristics of the as-sprayed HEMs have been observed through open burn tests and pressure cell tests. Granular HEMs show high gas generation and high pressurization rate, while nitrocellulose (NC) fibers existing in the clay-like HEMs would weaken the reactivity to a certain extent. HEMs obtained from the mixture of n-propanol and diethyl ether, in which nano-CL-20 exists as independent particles rather than a matrix, exhibit high gas generation but low pressurization rate. The results indicate that the energy releasing performance of the prepared HEMs can be readily regulated by constructing various interfacial microstructures to satisfy the broad requirements of energy sources.
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