Fabrication of Bismuth Trioxide Nanoparticles for Gas-Generators Application
K.S. Martirosyan, L. Wang, A. Vicent, D. Luss
University of Houston, US
Keywords: nanoenergetic gas-generators, bismuth trioxide, combustion synthesis
Abstract:Nanoenergetic materials release significant amount of energy at a higher rate and have a potential for various military applications. These systems lead to a fast propagation of a reaction front through the solid reactant mixtures. Most previous research in this area was focused on the impact of the particle size on the amplitude and velocity of the moving temperature front and ignition features. Recently, we proposed Nanoenergetic Gas Generators (NGG) systems that may release a significant amount of gas and can be used as next generation explosives. A nano-particle mixture of Bi2O3 and Al generates the highest pressure pulse among all the mixtures studied so far. We have shown that use of highly crystalline Bi2O3 nanoparticles increases the amplitude of the gas release. The goal of this study was to develop a highly efficient solution combustion synthesis process that can produce pure crystalline Bi2O3 nanoparticles in the range of 20-40nm with lattice parameter a=7.736(7)Å and c=5.628(9)Å Bi2O3. The use of these synthesized Bi2O3 nanoparticles in the reaction Bi2O3+2Al=Al2O3+2Bi generates a peak pressure of ~10MPa at m=0.5g and V=0.342L.