Results 141 to 150 of about 645 (171)

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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Combustion of 3D printed 90 wt% loading reinforced nanothermite

Combustion and Flame, 2020
Abstract The use of Al-based nano-energetic materials has been limited in part due to difficulties in fabrication of high-density composites. In this paper, free-standing energetic composites with loading of up to 90 wt% Al-CuO were fabricated by 3D printing. A polymer hybrid of 3 wt% hydroxy propyl methyl cellulose (HPMC), 3.5 wt% nitrocellulose (NC)
Jinpeng Shen, Haiyang Wang, Dylan J. Kline, Yong Yang, Xizheng Wang, Miles Rehwoldt, Tao Wu, Scott Holdren, Michael R. Zachariah   +8 more
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Sulfates‐Based Nanothermites: An Expanding Horizon for Metastable Interstitial Composites

Angewandte Chemie International Edition, 2015
AbstractMetal sulfates (Ba, Bi, Ca, Cu, Mg, Mn, Na, Zn, Zr) were used as oxidizers in reactive compositions with Al nanopowder. These new kinds of nanothermites have outstandingly high reaction heats (4–6 kJ g−1) compared to conventional Al/metal oxides (1.5–4.8 kJ g−1) and also have good combustion velocities (200–840 m s−1 vs 100–2500 m s−1).
Marc, Comet, Geoffrey, Vidick, Fabien, Schnell, Yves, Suma, Bernard, Baps, Denis, Spitzer   +5 more
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Detailed Chemical Kinetic Models for Nanothermites Combustion

Propellants, Explosives, Pyrotechnics, 2018
AbstractThe development of nanothermites and the understanding of their behaviors need several improvements in many domains including thermochemistry and chemical kinetics. In this paper a brief state of the art is presented in these fields and possible approaches are presented.
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Melt dispersion mechanism for fast reaction of nanothermites

Applied Physics Letters, 2006
An unexpected mechanism for fast oxidation of Al nanoparticles covered by a thin oxide shell (OS) is proposed. The volume change due to melting of Al induces pressures of 0.1–4GPa and causes spallation of the OS. A subsequent unloading wave creates high tensile pressures resulting in dispersion of liquid Al clusters, oxidation of which is not limited ...
Valery I. Levitas, Blaine W. Asay, Steven F. Son, Michelle Pantoya   +3 more
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Reduced-Sensitivity Nanothermites Containing Manganese Oxide Filled Carbon Nanofibers

The Journal of Physical Chemistry C, 2010
Nanothermites are versatile pyrotechnic systems composed of a metal oxide and a reducing metal powder, such as aluminum. The high mechanical sensitivity of some of these mixtures (e.g., MnO2/Al) makes their handling hazardous. Enclosing the metal oxide inside carbon nanofibers—thus separating oxidizer and reducing agent—is a new way to lower the ...
Benny Siegert, Marc Comet, Olivier Muller, Geneviève Pourroy, Denis Spitzer   +4 more
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Phosphorus-based nanothermites: A new generation of energetic materials

Journal of Physics and Chemistry of Solids, 2010
Abstract Thermites are energetic materials that are classically made of a transition metal oxide mixed with a reducing metal. Contrary to explosives, thermites do not detonate because their combustion is relatively slow and their reaction by-products are often solid or liquid.
Marc Comet, Vincent Pichot, Benny Siegert, Fabien Schnell, Fabrice Ciszek, Denis Spitzer   +5 more
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Electric-Spark Initiation of Nanothermites

Combustion, Explosion, and Shock Waves, 2023
A. Yu. Dolgoborodov, B. D. Yankovskii, P. A. Arsenov, S. Yu. Anan’ev, L. I. Grishin, G. E. Val’yano, T. I. Borodina, G. S. Vakorina   +7 more
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