Abstract In order to solve decreasing of reactivity of nano aluminum powder due to the alumina shell on the surface, used polyethylene glycol (PEG) as a coating material to obtain in situ PEG on nano aluminum particles with electrical explosion wires method. Based on the minimum free energy principle and BKW equation, the combustion and explosion performance of the coated sample is estimated. SEM and TEM to observe sample’s morphology and then used dynamic light scattering (DLS) nano-particle size analyzer to characterize sample’s particle size distribution. The chemical states of surface elements were analyzed by X-ray photoelectron spectroscopy. The thermal behavior of three samples were characterized by simultaneous thermal analyzer. The combustion heat, pressure-time curve, active Al content and vacuum stability was measured according to national standards. The results show that the coated sample was nearly sphere and particles were deduced multi-core structure. The active Al content reached 71.17% which is 12.53% higher than raw nano-Al particles. It was proved that PEG relieves oxidation of nano-Al, and the coating is stable. The coated samples can release energy more rapidly compared to micro-Al. The PVA in situ coated nano-Al particles has high active Al content and reactivity. Its application in energetic materials has good prospects.

中文翻译：

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聚乙二醇原位包覆纳米铝粉能量释放预测及结构表征

摘要 为解决纳米铝粉由于表面有氧化铝壳而导致反应活性降低的问题，以聚乙二醇(PEG)为包覆材料，采用电爆丝法在纳米铝颗粒上原位获得PEG。基于最小自由能原理和BKW方程，对涂层样品的燃烧和爆炸性能进行估计。SEM和TEM观察样品的形态，然后使用动态光散射（DLS）纳米粒度分析仪表征样品的粒度分布。通过X射线光电子能谱分析表面元素的化学状态。三个样品的热行为由同步热分析仪表征。燃烧热、压力-时间曲线，活性铝含量和真空稳定性按国家标准测定。结果表明，包覆后的样品几乎呈球形，颗粒呈多核结构。活性铝含量达到 71.17%，比原始纳米铝颗粒高 12.53%。证明PEG可减轻纳米铝的氧化，涂层稳定。与微铝相比，涂层样品可以更快地释放能量。PVA 原位包覆的纳米铝颗粒具有高活性铝含量和反应活性。其在含能材料中的应用前景广阔。并且涂层稳定。与微铝相比，涂层样品可以更快地释放能量。PVA 原位包覆的纳米铝颗粒具有高活性铝含量和反应活性。其在含能材料中的应用前景广阔。并且涂层稳定。与微铝相比，涂层样品可以更快地释放能量。PVA 原位包覆的纳米铝颗粒具有高活性铝含量和反应活性。其在含能材料中的应用前景广阔。