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Combustion, Explosion and Shock Waves

2016 year, number 2

Paradox of Small Particles in the Pulsed Laser Initiation of Explosive Decomposition of Energetic Materials

A. V. Kalenskii1, M. V. Anan'eva1, A. A. Zvekov2, I. Yu. Zykov1
1Kemerovo State University, Kemerovo, 650043 Russia
2Institute of Coal Chemistry and Materials Science, Siberian Branch, Russian Academy of Sciences, Kemerovo, 650000 Russia
Keywords: парадокс малых частиц, тепловой взрыв, энергетический материал, оптическое инициирование, длительность импульса, paradox of small particles, thermal explosion, energetic material, optical initiation, pulse duration

Abstract

The dependences of the critical energy density required to initiate the explosive decomposition of lead azide and the radius of the most heated nanoparticle on the pulse duration of the first harmonic of neodymium laser (1064 nm) are calculated within the framework of the micro-hotspot model of thermal explosion. The calculations are carried out with account for the dependence of the absorption efficiency factor of the laser pulse on the lead nanoparticle radius. With the maximum value of the absorption efficiency factor (1.18), the lead nanoparticle radius (in lead azide) becomes 74 nm. If the pulse duration is short (smaller than 40 ns), the radius of the most heated lead nanoparticle in the lead azide matrix varies slightly (less than 15%) and equals 63.5 nm within the range of short pulse durations. Accounting for the dependence of the absorption efficiency factor of the laser pulse on the nanoparticle radius makes it possible to resolve the paradox of small particles.