Micro hot-spot model of thermal explosion taking into account dielectric shell of sensitizing nanoparticle

The aim of this work is to modernize the micro hot-spot model of explosion decomposition laser initiation taking account optical and thermal properties of dielectric shell. The tasks are to modernize the micro hot-spot model of explosion decomposition taking into account the transparent dielectric shell of nanoparticle, which physical properties (complex refractive index, the coefficient of thermal conductivity) differ significantly from the properties of the material of nanoparticle nucleus; to calculate the efficiency factors of absorption and scattering of nanoparticles with the structure of the metal core – dielectric shell; to calculate the maximum temperature dependence on the radius of the nanoparticle at different thicknesses of the dielectric shell. Influence of oxide shell on the optical properties of the aluminium nanoparticles was studied in terms of Aden-Kerker and Mie theory for the spherical particle. It was shown that oxide shell changes drastically the optical properties of the nanoparticle, while the heating kinetics is influenced insignificantly. (paper)