Influence of humidity on the thermal behavior of aluminum nanopowders

Influence of humidity on the thermal behavior of aluminum nanopowders
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湿度对纳米铝粉热行为的影响

DOI:
10.1016/j.matchemphys.2005.07.064
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发表时间:
2006-05
影响因子:
4.6
通讯作者:
C. S. Xie
C. S. Xie
中科院分区:
材料科学3区
文献类型:
--
作者:
Y. Li;W. L. Song;C. S. Xie

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纳米铝粉由于其在炸药和推进剂混合物中的潜在应用而越来越受到人们的关注。定性研究了湿度对纳米铝粉热行为的影响以及含钝化氧化物涂层的纳米铝粉的氧化行为。通过DSC-TG确定了热行为,并使用高分辨率透射电子显微镜(HRTEM)检查Al纳米粉末,以了解铝纳米颗粒中氧化物涂层的稳定性。结果表明,Al纳米粒子的粒径在10- 100 nm之间。原始的Al纳米颗粒被3 nm厚的致密的非晶氧化物层覆盖。储存8周后,氧化层生长至5 nm厚,氧化扩散至Al纳米颗粒内部。结果表明,纳米铝粉的反应活性受环境影响较大,尤其是湿度。较高的相对湿度会加速纳米铝粉的老化。DSC-TG结果表明,Al纳米颗粒的氧化至少发生在两个步骤。
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 10–100nm. The original Al nanoparticles were covered by a 3nm thick compact amorphous oxide layer. After stored for 8 weeks, the oxide layer grew up to 5nm 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.
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