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Oxidation Dynamics of a Chain of Aluminum Nanoparticles

Published online by Cambridge University Press:  15 February 2013

Adarsh Shekhar ,
Weiqiang Wang ,
Richard Clark ,
Rajiv K. Kalia ,
Aiichiro Nakano  and
Priya Vashishta
Adarsh Shekhar
Affiliation:
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA
Weiqiang Wang
Affiliation:
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA
Richard Clark
Affiliation:
Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
Rajiv K. Kalia
Affiliation:
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA Department of Computer Science, University of Southern California, Los Angeles, CA 90089, USA
Aiichiro Nakano
Affiliation:
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA Department of Computer Science, University of Southern California, Los Angeles, CA 90089, USA
Priya Vashishta
Affiliation:
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA Department of Computer Science, University of Southern California, Los Angeles, CA 90089, USA
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Abstract

Multimillion-atom molecular dynamics simulations are used to investigate burning behavior of a chain of three alumina-coated aluminum nanoparticles (ANPs), where particles one and three are heated above the melting temperature of pure aluminum. The mode and mechanism behind the heat and mass transfer from the hot ANPs (particles one and three) to the middle, cold ANP (particle two) are studied. The hot nanoparticles oxidize first, after which hot Al atoms penetrate into the cold nanoparticle. It is also found that due to the penetration of hot Al atoms, the cold nanoparticle oxidizes at a faster rate than in the initially heated nanoparticles. The calculated speed of penetration is found to be 54 m/s, which is within the range of experimentally measured flame propagation rates. As the atoms penetrate into the central ANP, they maintain their relative positions. The atoms from the shell of the central ANP form the first layer, which is followed by the atoms from the shell of the outer ANP making the second layer and lastly the atoms from the core of the outer ANPs form the third layer. In addition to heating the central ANP by convection, the ejected hot Al atoms from the outer ANPs initiate exothermic oxidation reactions inside the central ANP, leading to further heating within the central ANP. During 1 ns, all three ANPs fuse together, forming a single ellipsoidal aggregate.

Keywords

nanoscalesimulationenergetic material
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1521: Symposium OO – Properties, Processing and Applications of Reactive Materials , 2013 , mrsf12-1521-oo08-08
Copyright
Copyright © Materials Research Society 2013

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