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Ignition and Oxidation of Core-Shell Al/Al2O3 Nanoparticles in Oxygen Atmosphere; Insights from Molecular Dynamics Simulation
Chu Q; Shi B; Liao LJ(廖丽涓); Luo KH; Wang N; Huang CG(黄晨光)
发表期刊The Journal of Physical Chemistry C
2018-12-05
卷号122期号:51页码:29620–29627
摘要

This study employed the reactive force field molecular dynamics to capture atomic-level heat and mass transfer and reaction processes of an aluminum nanoparticle (ANP) oxidizing in a high temperature and pressure oxygen atmosphere, revealing detailed mechanisms for oxidation of ANPs. Temporal variations of temperature, density, mean square displacement, atom consumption rate, and heat release rate of ANPs have been systematically examined. In addition, the effects of environment on ANP oxidation were also evaluated. The results show that ANPs undergo four stages of preheating, melting, fast Al core, and moderate shell oxidations during the whole oxidation process. The Al core starts to melt from a core–shell interface with outward diffusion of core Al atoms into the shell. Intense reaction occurs between shell O and core Al atoms around the interface at the end of melting, leading to fast Al core oxidation. After complete oxidation of the Al core, the oxide shell continues to react with ambient O atoms. Both the initial environmental temperature and the equivalent pressure significantly influence the preheating. Conversely, the melting stage seems almost independent of any of them. However, fast Al core oxidation presents more sensitivity to the ambient equivalent pressure.

收录类别SCI ; EI
语种英语
论文分区二类
力学所作者排名1
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/78251
专题流固耦合系统力学重点实验室
推荐引用方式
GB/T 7714
Chu Q,Shi B,Liao LJ,et al. Ignition and Oxidation of Core-Shell Al/Al2O3 Nanoparticles in Oxygen Atmosphere; Insights from Molecular Dynamics Simulation[J]. The Journal of Physical Chemistry C,2018,122(51):29620–29627.
APA Chu Q,Shi B,Liao LJ,Luo KH,Wang N,&Huang CG.(2018).Ignition and Oxidation of Core-Shell Al/Al2O3 Nanoparticles in Oxygen Atmosphere; Insights from Molecular Dynamics Simulation.The Journal of Physical Chemistry C,122(51),29620–29627.
MLA Chu Q,et al."Ignition and Oxidation of Core-Shell Al/Al2O3 Nanoparticles in Oxygen Atmosphere; Insights from Molecular Dynamics Simulation".The Journal of Physical Chemistry C 122.51(2018):29620–29627.
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