Author
A.G. Keenan
Bio: A.G. Keenan is an academic researcher from University of Miami. The author has contributed to research in topics: Ammonium perchlorate & Thermal decomposition. The author has an hindex of 4, co-authored 5 publications receiving 107 citations.
Papers
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75 citations
TL;DR: The low temperature thermal decomposition of ammonium perchlorate is initiated by a single stage nucleation process at a lattice defect site on the surface of the crystal as mentioned in this paper.
16 citations
TL;DR: In this article, the electrical conductivity of single crystals of ammonium perchlorate has been studied from 25 to 180°C, showing that conduction in the low-temperature region is mainly due to migration of NH4+ through cation vacancies.
10 citations
01 Aug 1968
TL;DR: In this paper, a review includes the following topics: Stoichiometry of thermal decomposition, deflagration, crystal structure and transformation, sublimation, low temperature reaction mechanisms (electron transfer, proton transfer, activation energy), effect of impurities, particle size, and lattice defects.
Abstract: : The review includes the following topics: Stoichiometry of thermal decomposition; Stoichiometry of deflagration; Crystal structure and transformation; Sublimation; Low temperature reaction mechanisms (electron transfer, proton transfer, activation energy); High temperature reaction mechanisms; Effect of impurities, particle size, and lattice defects.
8 citations
TL;DR: In this paper, the electrical conductance of ammonium perchlorate has been theoretically investigated by a computer simulation technique using a polarizable point-ion model, and a novel turnstile mechanism involving slow synchronous rotations of the perchlorates ions to allow passage of the ammonium ions is proposed for vacancy migration.
4 citations
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TL;DR: In this article, the authors summarize literature data on thermal decomposition of ammonium perchlorate and discuss the mechanism of the decomposition and various factors that influence the thermal decompositions of perchlorates.
492 citations
TL;DR: In this paper, a new computational technique (advanced isoconversional method) has been used to determine the dependence of the effective activation energy (Eα) on α for isothermal and nonisothermal TGA data.
Abstract: The methods of thermogravimetric analysis (TGA) and differential scanning calorimettry (DSC) have been used to study the thermal decomposition of ammonium perchlorate (AP). TGA curves obtained under both isothermal and nonisothermal conditions show a characteristic slowdown at the extents of conversion, α = 0.30−0.35. DSC demonstrates that in this region the process changes from an exothermic to an endothermic regime. The latter is ascribed to dissociative sublimation of AP. A new computational technique (advanced isoconversional method) has been used to determine the dependence of the effective activation energy (Eα) on α for isothermal and nonisothermal TGA data. At α > 0.1, the Eα dependencies obtained from isothermal and nonisothermal data are similar. By the completion of decomposition (α → 1) the activation energy for the isothermal and nonisothermal decomposition respectively rises to ∼110 and ∼130 kJ mol-1, which are assigned to the activation energy of sublimation. The initial decomposition (α → ...
240 citations
TL;DR: In this paper, an attempt to collect summarized literature data on catalytic effect of nanosized metals and nanoalloys on the thermal decomposition of ammonium perchlorates (AP) is made.
189 citations
TL;DR: In this article, an attempt to collect the summarised data of literature on catalytic effect of nano-oxides, such as mono oxides, mixed oxide, binary and ternary ferrites and rare earth metal oxides on the thermal decomposition of ammonium perchlorate (AP) is made.
Abstract: In this review, an attempt to collect the summarised data of literature on catalytic effect of nano-oxides, such as mono oxides, mixed oxide, binary and ternary ferrites and rare earth metal oxides on the thermal decomposition of ammonium perchlorate (AP) is made. Influence of size effect of oxides on thermal decomposition of AP and comparison of bulk and nanosized oxides is also discussed here. Several experimental results revealed that due to small size and large surface area nanosized metal oxides are more potential catalysts on thermal decomposition of AP compared to their bulk size oxides.
94 citations
TL;DR: In this article, mesoporous β-MnO2 has been demonstrated to possess excellent catalytic activity in the thermal decomposition of ammonium perchlorate and was used as a highperforming ballistic modifier in composite solid rocket propellants.
Abstract: Mesoporous β-MnO2 has been prepared, characterized and demonstrated to possess excellent catalytic activity in the thermal decomposition of ammonium perchlorate. The observed unprecedentedly low decomposition temperatures, fast reaction rates and enhanced heat releases in the catalysed formulations make mesoporous β-MnO2 promising as a high-performing ballistic modifier in AP-based composite solid rocket propellants.
91 citations