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, the catalytic mechanism is the presence of O 2 − on the surface of Cu/Fe-MOs which can simplify thermal decomposition of ammonium perchlorate (AP) and their catalytic activity was studied by thermal gravimetric and differential thermal analysis.
44 citations
01 Jan 2000
TL;DR: In this paper, the surface regression rate of the interface region, ultraviolet emission and transmission imaging of the gas-phase flame zone, and numerical simulations using simplified kinetics were investigated through measurements of the surface, and the results showed that over the observed pressure range (0.2 to 3.2 MPa), for binder widths from 100 to 450 μm, the regression rate is primarily a function of pressure ( r b ≈p 0.4 ) and is relatively independent of binder length.
Abstract: The gas-phase flame structure that forms over a lamina of hydroxyl-terminated polybutadiene (HTPB) binder (50 to 450 μm) sandwiched between layers of ammonium perchlorate (AP) has been investigated through measurements of the surface regression rate of the interface region, ultraviolet emission and transmission imaging of the gas-phase flame zone, and numerical simulations using simplified kinetics. The results show that over the observed pressure range (0.2 to 3.2 MPa), for binder widths from 100 to 450 μm, the regression rate is primarily a function of pressure ( r b ≈p 0.4 ) and is relatively independent of binder width. At binder widths below 100 μm, the regression rate is reduced, presumably due to locally lean conditions created by diffusive mixing. The imaging results suggest the existence of relatively UV-inactive leading-edge flames that form on the AP side of the interfaces adjacent to the surface and probably dominate the regression rate. These leading-edge flames are followed by a relatively UV-active secondary flame region downstream. Both the leading-edge and secondary flames show a tendency to merge into a single flame for thin binder and at lower pressures (low Peclet and Damkohler numbers), and to split into two distinct flames for thick binder ( Pe> 2) and at higher pressures (high Da ). The modeling results show that simplified kinetics representing the AP monopropellant flame and the AP-binder non-premixed flame, in the framework of a species and energy transport analysis, can predict surface heat feedback distributions that correlate reasonably well with observed surface profiles.
44 citations
TL;DR: In this paper, a reduced graphene oxide (rGO) decorated with finely dispersed Fe2O3 nanoparticles was prepared through a facile atomic layer deposition (ALD) route.
44 citations
TL;DR: In this paper, the catalytic activities of NiO nanocrystals on the thermal decomposition of ammonium perchlorate were investigated by thermogravimetric analysis (TG) coupled with differential thermal analysis (DTA).
Abstract: This work reported on the thermal decomposition of ammonium perchlorate activated by addition of NiO nanocrystals with different surface areas. NiO samples were characterized by X-ray diffraction (XRD), transition electron microscope (TEM), Brunauer-Emmett-Teller (BET) technique, Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy. With increasing annealing temperature, the surface areas of NiO samples reduced from 108.6 to 0.9 m2 g−1. The catalytic activities of NiO nanocrystals on the thermal decomposition of ammonium perchlorate were investigated by thermogravimetric analysis (TG) coupled with differential thermal analysis (DTA). With addition of NiO nanocrystals, thermal decomposition temperature of AP decreased greatly. Larger surface areas of NiO nanocrystals promoted the thermal decomposition of AP.
43 citations
TL;DR: In this paper, an investigation of irradiated ammonium perchlorate was conducted by electron spin resonance and a new specie, the NH3+ radical was discovered, which appears to be stable up to at least 126 deg C.
Abstract: : An investigation of irradiated ammonium perchlorate was conducted by electron spin resonance. A new specie, the NH3+ radical was discovered. This ion radical appears to be stable up to at least 126 deg C.
43 citations