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International Journal of Energetic Materials and Chemical Propulsion

Publicou 6 edições por ano

ISSN Imprimir: 2150-766X

ISSN On-line: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

Indexed in

MECHANOCHEMICAL MECHANISM FOR FAST REACTION OF METASTABLE INTERMOLECULAR COMPOSITES BASED ON DISPERSION OF LIQUID METAL

Volume 7, Edição 1, 2008, pp. 17-37
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v7.i1.20
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RESUMO

A new mechanism for fast reaction of Al nanoparticles covered by a thin oxide shell during fast heating is proposed and justified theoretically and experimentally. For nanoparticles, the melting of Al occurs before oxide fracture. The volume change due to melting induces pressures of 1-2 GPa and causes dynamic spallation of the shell. The unbalanced pressure between the Al core and the exposed surface creates an unloading wave with high tensile pressures resulting in dispersion of small liquid Al clusters. These clusters fly at high velocity and their reaction is not limited by diffusion (this is the opposite of traditional mechanisms for micron particles and for nanoparticles at slow heating). A number of theoretical predictions are confirmed experimentally. Main controlling physical parameters are determined. Some methods to expand the melt-dispersion mechanism for micron particles are formulated. This mechanism resolves some basic puzzles in combustion of Al particles. Some basic parameters of the melt-dispersion mechanism (strength of the oxide shell, heating rate necessary to activate the mechanism and size of the dispersed clusters) are estimated. It is found that the melt-dispersion mechanism may induce a new mode of energy transfer and heating ahead of flame front. Molten and reacting Al clusters are dispersed at speeds that exceed the macro-scale flame velocities of the mixture. In this way, the molten Al clusters can heat the reactant mixture prior to flame propagation. An equation for the flame velocity versus Al nanoparticle geometrical parameters, thermomechanical properties, and synthesis parameters is formulated. The melt-dispersion mechanism was also found to be in agreement with experiments for 1-3 micron diameter Al particles and fluorination. Our results completely change the direction in which the Al nanoparticle synthesis progresses.

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