Results 131 to 140 of about 587 (158)

Les nanothermites

2016
L’introduction récente de la dimension « nano » dans le domaine de la pyrotechnie a permis de développer une nouvelle famille de substances hautement réactives : les nanothermites. Celles-ci ont une composition chimique comparable à celle des thermites de granulométrie submillimétrique ou micrométrique, mais possèdent une morphologie ayant un degré d ...
Eric Lafontaine, Marc Comet
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Nanothermites for space and defence applications

SPIE Proceedings, 2009
Thermites are energetic materials which are made of a metallic oxide mixed with a reducing metal1. The reactivity of classical thermites is moderate but it can be substantially improved when micron-sized particles are replaced by nanoparticles. In this paper, three examples of nanothermites are given in order to illustrate the contribution of these
Marc Comet, Denis Spitzer, Jean-Pierre Moeglin   +2 more
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Fast-Impulse Nanothermite Solid-Propellant Miniaturized Thrusters

Journal of Propulsion and Power, 2013
Highly reactive nanothermites prepared by mixing bismuth trioxide or cupric oxide nanoparticles with aluminum nanoparticles were evaluated as solid propellants for small-scale propulsion applications. Miniaturized engines were fabricated from steel in three-piece configurations without a converging/diverging nozzle.
Clay S. Staley, Kristofer E. Raymond, Rajagopalan Thiruvengadathan, Steven J. Apperson, Keshab Gangopadhyay, Sean M. Swaszek, Robert J. Taylor, Shubhra Gangopadhyay   +7 more
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Combustion Features of Nanothermites in Pyrotechnic Heaters

Russian Journal of Physical Chemistry B, 2019
Several thermite systems (Al/Fe2O3 and Mg/Fe2O3) with promising applications in sealed pyrotechnic heat sources under space conditions have been reported earlier. Experiments have found excellent propagation of the combustion reaction of these thermites inside sealed steel tubes. Outer tube surfaces have been heated up to 700–1000°C.
K. A. Monogarov, D. B. Meerov, Yu. V. Frolov, A. N. Pivkina   +3 more
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Aluminum Hydride as a Fuel Supplement to Nanothermites

Journal of Propulsion and Power, 2014
PressurizationratesincreasebyafactorofabouttwowiththeadditionofAlH3,whereasburntubevelocitiesincrease by about 25%. The enhancement in pressurization rate appears to primarily be a result of the increased pressure associated with the AlH3 decomposition in the nanocomposite thermite system and an enhancement in convective heat transfer.
G. Young, K. Sullivan, N. Piekiel, M. R. Zachariah   +3 more
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Preparation and characterization of n-Al/FeF3 nanothermite

Chemical Engineering Journal, 2018
Abstract A new type of nanothermite composed of n-Al (metal fuel) and FeF3 (oxidizer) was investigated in this paper. The thermal behavior and combustion properties of the n-Al/FeF3 nanothermite were compared with that of n-Al/Fe2O3 nanothermite by TG/DSC-MS, XRD, SEM and high-speed camera.
Pan Liu, Xiangyu Li, Long Cheng, Xuqiang Zhu, Yanchun Li, Dongming Song   +5 more
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Direct Writing of a 90 wt% Particle Loading Nanothermite

Advanced Materials, 2019
AbstractThe additive manufacturing of energetic materials has received worldwide attention. Here, an ink formulation is developed with only 10 wt% of polymers, which can bind a 90 wt% nanothermite using a simple direct‐writing approach. The key additive in the ink is a hybrid polymer of poly(vinylidene fluoride) (PVDF) and hydroxy propyl methyl ...
Haiyang Wang, Jinpeng Shen, Dylan J. Kline, Noah Eckman, Niti R. Agrawal, Tao Wu, Peng Wang, Michael R. Zachariah   +7 more
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Semi-Empirical Model for Reaction Progress in Nanothermite

Journal of Propulsion and Power, 2010
Calculations of thermite reaction progress were made using the Cheetah thermochemistry package. Progress was modeled by fractionally substituting reactants with an inert species with identical thermodynamic properties. The results of this model have been used to create a semi-empirical model of regression rate.
Adam Trebs, Timothy J. Foley
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Thermo-Kinetic Study of Core-Shell Nanothermites

AIP Conference Proceedings, 2006
This article presents the formulation of a new nano‐thermite mixture (Al/KMnO4) for application in energetic materials. Reactivities of different thermite mixtures have been compared by a constant volume combustion experiment and the results indicate that the reactivity of the new formulation is two orders of magnitude greater than the traditional ...
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Processing and characterization of aluminum-based nanothermites

Journal of Thermal Analysis and Calorimetry, 2009
During the past several years, a significant effort has been on investigation of reaction front propagation and the rate of energy release in heterogeneous systems consisting of nanopowder reactants. Substantial size reduction of each reactant powder (e.g.
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