The flowability of nano-aluminum (nAl) particles is poorly characterized or tailored but must be improved for their manufacturing or application of interest. In this work, a strategy was proposed to improve the fluidity of nAl particles and increase the active aluminum content of nAl particles to be higher than that of naturally passivated nAl with similar size by 14%. The main method was introducing the non-cohesive layers with high absorption ability to slow down the oxidizing gas diffusion on the nAl surface at room temperature. The gasses released by the adsorption layer combustion could inhibit the sintering of the produced nAl particles and thereby enhance the reaction efficiency at high temperatures, thus endowing nAl with thermal activity. Characterization and experimental results indicated that the multi-component adsorption layers were composed of amorphous carbon, thin oxide layer, and solvent molecules, which improved the flowability by weakening the cohesion between nAl particles. As a result, the produced nAl particles with improved flowability were evenly dispersed in the nAl/oxidizer mixture. This characteristic was conducive to the mass transfer and energy diffusion on the nAl surface during initial ignition and reaction propagation.

纳米铝 (nAl) 颗粒的流动性没有得到很好的表征或定制，但必须对其制造或感兴趣的应用进行改进。在这项工作中，提出了一种提高 nAl 颗粒流动性和增加 nAl 颗粒的活性铝含量的策略，使其比具有相似尺寸的自然钝化 nAl 高 14%。主要方法是在室温下引入具有高吸收能力的非粘性层来减缓氧化气体在 nAl 表面上的扩散。吸附层燃烧释放的气体可以抑制生成的nAl颗粒的烧结，从而提高高温下的反应效率，从而赋予nAl热活性。表征和实验结果表明，多组分吸附层由无定形碳、薄氧化物层和溶剂分子组成，通过削弱 nAl 颗粒之间的内聚力来提高流动性。结果，产生的具有改善的流动性的 nAl 颗粒均匀地分散在 nAl/氧化剂混合物中。这种特性有利于初始点火和反应传播过程中 nAl 表面的传质和能量扩散。