Topic
Ammonium perchlorate
About: Ammonium perchlorate is a research topic. Over the lifetime, 2359 publications have been published within this topic receiving 33412 citations. The topic is also known as: AP.
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TL;DR: In this article, B/Nitrocellulose (NC)/Fe particles were fabricated by electrospraying and compared with pure boron, lower oxidation temperature was observed in the thermal analysis of prepared particles.
41 citations
TL;DR: In this article, Mg nanoparticles were prepared in tetrahydrofuran via lithium reduction of the corresponding Mg salt and X-ray diffraction and scanning electron microscope investigations confirm the formation of hexagonal phase Mg particles with an average size of 300 nm.
41 citations
01 Jan 2002
TL;DR: In this article, a numerical framework is described which permits the calculation of the three-dimensional combustion field supported by a heterogeneous propellant, allowing for complete coupling between the condensed phase physics, the gas-phase physics, and the unsteady uneven, regressing surface.
Abstract: A numerical framework is described which permits the calculation of the three-dimensional combustion field supported by a heterogeneous propellant, allowing for complete coupling between the condensed-phase physics, the gas-phase physics, and the unsteady uneven, regressing surface. A random-packing algorithm is used to construct models of ammonium perchlorate (AP) in hydroxyl-terminated polybutadiene propellants which minic experimental propellants designed by R. Miller, and these are numerically burnt, Mean burning rates are compared with experimental data for four packs, over a pressure range of 7–200 atm. The effect of the local propellant morphology on the local surface regression speed is examined, with particular attention to the behavior in the neighborhood of large AP particles, At first, these burn slowly and protrude significantly above the surrounding surface, but later they are rapidly consumed and the surface flattens. In all cases, mean burning rates can be accurately calculated using an Oseen approximation for the velocity field, rather than solving the Navier-Stokes equations.
41 citations
TL;DR: Energy minima and enthalpies at 298 and 800 K were computed for 37 atoms, molecules and ions that have been implicated as intermediates in the thermal decomposition of ammonium perchlorate as discussed by the authors.
Abstract: Energy minima and enthalpies at 298 and 800 K were computed for 37 atoms, molecules and ions that have been implicated as intermediates in the thermal decomposition of ammonium perchlorate. These data permit the calculation of ΔH(298 K) and ΔH(800 K) for hundreds of reactions that may be involved; 39 of these are listed, and several possible decomposition pathways are outlined. The computations were carried out at the density functional B3PW91/6-3ll+G(2df) level, which we found to be effective for systems containing several oxygen and/or chlorine atoms in close proximity. ΔH(298 K) and ΔH(800 K) are found to differ by less than 1.0 kcal mol−1. We have identifiied an intermediate complex in the sublimation of ammonium perchlorate (believed to be the first decomposition step) which accounts for the activation energy of sublimation being considerably less than its overall enthalpy change.
40 citations
40 citations