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Influence of humidity on the thermal behavior of aluminum nanopowders

机译：湿度对铝纳米粉热性能的影响

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Aluminum (Al) nanopowders have increasingly gained attention because of their potential incorporation in explosive and propellant mixtures. This paper reports on a qualitative study on influence of humidity on the thermal behavior of Al nanopowders and the oxidation of aluminum nanoparticles containing a passivating oxide coating. The thermal behaviors were identified by DSC-TG, and Al nanopowders were examined using high-resolution transmission electron microscopy (HRTEM) to understand the stability of the oxide coating in aluminum nanoparticles. It was found that the diameter of Al nanoparticles was in range of 10-100 nm. The original Al nanoparticles were covered by a 3 nm thick compact amorphous oxide layer. After stored for 8 weeks, the oxide layer grew up to 5 nm thick, and the oxidation diffused to the interior of Al nanoparticles. The results indicate that the reactivity of Al nanopowders is deeply influenced by the environment, especially the humidity. The higher relative humidity would accelerate the aging of the Al nanopowders. The DSC-TG results show the oxidation of Al nanoparticles occurs at least in two steps.
机译：铝（Al）纳米粉由于其潜在地掺入炸药和推进剂混合物中而日益受到关注。本文报道了定性研究湿度对铝纳米粉的热行为和含钝化氧化物涂层的铝纳米颗粒氧化的影响。通过DSC-TG鉴定热行为，并使用高分辨率透射电子显微镜（HRTEM）检查Al纳米粉，以了解铝纳米颗粒中氧化物涂层的稳定性。发现Al纳米颗粒的直径在10-100nm的范围内。原始的Al纳米颗粒被3 nm厚的致密非晶氧化物层覆盖。储存8周后，氧化物层长到5 nm厚，并且氧化扩散到Al纳米颗粒的内部。结果表明，Al纳米粉体的反应性受环境，尤其是湿度的影响很大。较高的相对湿度将加速Al纳米粉的老化。 DSC-TG结果表明，Al纳米颗粒的氧化至少发生在两个步骤中。

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