Tuning the reactivity of energetic nanoparticles by creation of a core-shell nan

2019-09-30 17:44:57

Iron nanoparticles oxide reactivity oxidizer

责任者: Prakash, A.;McCormick, A.V.;Zachariah, M.R. 单位: Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, United States 来源出处: Nano Letters,2005,5(7):1357-1360 摘要: This article presents a novel method for tuning the reactivity of nanoenergetic materials by coating a strong oxidizer nanoparticle (potassium permanganate; [similar to] 150 nm) with a layer of a relatively mild oxidizer (iron oxide). The measured reactivity for a nano-Al/composite oxidizer could be varied by more than a factor of 10, as measured by the pressurization rate in a closed vessel (psJ/μs), by changing the coating thickness of the iron oxide. The composite oxidizer nanoparticles were synthesized by a new aerosol approach in which the nonwetting interaction between iron oxide and molten potassium permanganate aids the phase segregation of a nanocomposite droplet into a core-shell structure. © 2005 American Chemical Society. 关键词: Nanostructured materials;Oxidation;Potassium compounds;Pressure effects;Wetting;Iron compounds;Phase composition;Energetic nanoparticles;Core-shell nanostructures;Size-dependent reactivity;Nanoenergetic mixtures