Tuning the reactivity of energetic nanoparticles by creation of a core-shell nanostructure.
This article presents a novel method for tuning the reactivity of nanoenergetic materials by coating a strong oxidizer nanoparticle (potassium permanganate; approximately 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 (psl/micros), 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.
Prakash
A
A
Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA.
McCormick
A V
AV
Zachariah
M R
MR
D000535:Aluminum / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004735:Energy Transfer; D005290:Ferric Compounds / Q000737:chemistry*; D008422:Materials Testing; D008968:Molecular Conformation; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010084:Oxidation-Reduction; D010316:Particle Size; D011196:Potassium Permanganate / Q000737:chemistry*; D011312:Pressure
D005290:Ferric Compounds; D011196:Potassium Permanganate; C000499:ferric oxide; D000535:Aluminum