SPECTRAL DEPENDENCE OF CRITICAL DENSITY OF ENERGY FOR INITIATION OF PETN (PENTAERYTHRITYL TETRANITRATE) CONTAINING NANO-PARTICLES OF GOLD

Abstract

The paper focuses on calculation of the basic parameters of initiation of the explosive decomposition of pentaerythrityl tetranitrate (PETN) containing nano-particles of gold: the dependences of the ratios of absorption effectiveness on the size of nano-particles in the matrix of PETN, critical (minimum) energy density of initiation of explosive decomposition of PETN – gold system, for the first (1064 nm) and second (532 nm) harmonics of neodymium laser. Upon transfer from the first to the second harmonic of neodymium laser the authors observed the shift of the maximum of effectiveness of absorption to the side of small radii of metal inclusions from 99 nm for the first harmonic to 22 nm – for the second. The value of the maximum ratio of absorption effectiveness in this case grows from 0.100 to 4.878. The calculated values of critical density of energy for initiation of PETN containing nano-particles of gold is: 552 mJ/cm2 for the first harmonic; 15 mJ/cm2 for the second, with radii of metal inclusions of 94 and 26 nm respectively. The authors conclude that the PETN – gold composite is a promising material for use as percussion cap of the optical detonator, which can be created on the base of the second harmonic of neodymium laser.

Keywords

• gold nanoparticles
• absorptivity
• simulation
• energetic materials
• safety explosives