Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

Date
2013-01-01
Authors
Roy, Sukesh
Jiang, Naibo
Stauffer, Han
Schmidt, Jacob
Kulatilaka, Waruna
Meyer, Terrence
Bunker, Christopher
Gord, James
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Mechanical Engineering
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Abstract

Spatially and temporally resolved temperature measurements behind an expanding blast wave are made using picosecond (ps) N2 coherent anti-Stokes Raman scattering (CARS) following laser flash heating of mixtures containing aluminum nanoparticles embedded in ammonium-nitrate oxidant. Production-front ps-CARS temperatures as high as 3600 ± 180 K-obtained for 50-nm-diameter commercially produced aluminum-nanoparticle samples-are observed. Time-resolved shadowgraph images of the evolving blast waves are also obtained to determine the shock-wave position and corresponding velocity. These results are compared with near-field blast-wave theory to extract relative rates of energy release for various particle diameters and passivating-layer compositions.

Description

The following article appeared in Journal of Applied Physics 113, 184310 (2013): and may be found at doi: 10.1063/1.4804410.

Keywords
aluminum nanoparticles, coherent anti-Stokes Raman scattering, energetic nanoparticles, energy release, laser flash-heating, particle diameters, relative rates, coherent scattering, Raman spectroscopy
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