Results 141 to 150 of about 1,663,746 (184)

Importance of Phase Change of Aluminum in Oxidation of Aluminum Nanoparticles

The Journal of Physical Chemistry B, 2004
Aluminum nanoparticles have increasingly gained attention because of their potential incorporation in explosive and propellant mixtures. This letter reports on a qualitative study on the oxidation of aluminum nanoparticles containing a passivating oxide coating.
Ashish Rai, Donggeun Lee, Kihong Park, Michael R. Zachariah   +3 more
openaire   +1 more source

Synthesizing aluminum nanoparticles in an oxide shell

Nanotechnologies in Russia, 2009
It is shown that a protective oxide shell can be formed on the surface of aluminum nanoparticles by the controlled addition of oxygen to the working inert gas of the installation while powders are being synthesized by the method of electrical explosion of wire.
Yu. A. Kotov, I. V. Beketov, A. I. Medvedev, O. R. Timoshenkova   +3 more
openaire   +1 more source

Aluminum Oxide Nanoparticles in Cement Mortar

Materials Performance, 2012
Compressive, tensile, and flexural strength of cement mortar containing 1, 3, and 5 wt% of aluminum oxide (Al2O3) nanoparticles were investigated. Samples containing 1 and 3 wt% Al2O3 nanoparticles show better mechanical properties than ordinary cement mortar. Increasing Al2O3, nanoparticles more than 5 wt% reduces the mechanical strength.
Mohammad Reza Arefi, Zohair Sarajan
openaire   +1 more source

Heat-Initiated Oxidation of an Aluminum Nanoparticle

MRS Proceedings, 2012
ABSTRACTMultimillion-atom reactive molecular dynamics simulations were used to investigate the mechanisms which control heat-initiated oxidation in aluminum nanoparticles. The simulation results reveal three stages: (1) confined burning, (2) onset of deformation, and (3) onset of small cluster ejections.
Richard Clark, Weiqiang Wang, Ken-ichi Nomura, Rajiv K. Kalia, Aiichiro Nakano, Priya Vashishta   +5 more
openaire   +1 more source

Oxidation Dynamics of a Chain of Aluminum Nanoparticles

MRS Proceedings, 2013
ABSTRACTMultimillion-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.
Adarsh Shekhar, Weiqiang Wang, Richard Clark, Rajiv K. Kalia, Aiichiro Nakano, Priya Vashishta   +5 more
openaire   +1 more source

Size-dependent nanoparticle reaction enthalpy: Oxidation of aluminum nanoparticles

Journal of Physics and Chemistry of Solids, 2011
Abstract Here we present a model describing the particle size dependence of the oxidation enthalpy of aluminum nanoparticles. The model includes the size dependence of the cohesive energy of the reactant particles, the size dependence of the product lattice energy, extent of product agglomeration, and surface capping effects. The strongest effects on
Chung, Stephen W., Guliants, Elena A., Bunker, Christopher E., Jelliss, Paul A., Buckner, Steven W.   +4 more
openaire   +2 more sources

Effect of ionization on the oxidation kinetics of aluminum nanoparticles

Chemical Physics Letters, 2018
Abstract Molecular dynamics simulation (MD) of the observed stepwise oxidation of core-shell structured Al/Al2O3 nanoparticles is presented. Different from the metal ion hopping process in the Cabrera-Mott model, which is assumed to occur only at a certain distance from the oxide layer, the MD simulation shows that Al atoms jump over various ...
Yao-Ting Zheng, Min He, Guang-xu Cheng, Zaoxiao Zhang, Fu-Zhen Xuan, Zhengdong Wang   +5 more
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Immiscibility of Nucleating Aluminum Oxide Nanoparticles in Vapor

The Journal of Physical Chemistry C, 2018
Multistep pathways in nucleation are now known to be ubiquitous and thus crucial to understand crystal formation processes. In a supersaturated mother phase, many types of source molecules are coagulated to form an amorphous or liquid-like intermediate, which subsequently transforms to a crystal.
Shinnosuke Ishizuka, Yuki Kimura, Jun Kawano, Rafael Escribano, Tomoya Yamazaki, Tetsuya Hama, Rikako Sato   +6 more
openaire   +1 more source

Collective oxidation behavior of aluminum nanoparticle aggregate

Applied Physics Letters, 2013
Aggregates of aluminum nanoparticles are good solid fuel due to high flame propagation rates. Multi-million atom molecular dynamics simulations reveal the mechanism underlying higher reaction rate in a chain of aluminum nanoparticles as compared to an isolated nanoparticle.
Adarsh Shekhar, Weiqiang Wang, Richard Clark, Rajiv K. Kalia, Aiichiro Nakano, Priya Vashishta   +5 more
openaire   +1 more source

Laser sintering of magnesia with nanoparticles of iron oxide and aluminum oxide

Applied Surface Science, 2015
Abstract Nanoparticles of iron oxide (Fe2O3, 20–40 nm) and aluminum oxide (Al2O3, 50 nm) were mixed in different concentrations (3, 5 and 7 wt%) in a magnesium oxide (MgO) matrix. The mixture pellet was irradiated with 532 nm output from a Q-switched Nd:YAG laser using different laser fluence and translation speed for sintering.
L.V. García, M.I. Mendivil, T.K. Das Roy, G.A. Castillo, S. Shaji   +4 more
openaire   +1 more source