Abstract

We investigated the effects of aluminum nanoparticles produced by acetonitrile-assisted ball milling on the ignition of JP-10 droplets acoustically levitated in oxygen and argon. A carbon dioxide laser ignited the droplets, and the induced combustion processes were followed via ultraviolet-visible and Fourier-transform infrared spectroscopies together with a high-speed thermal-imaging camera. The increased ignition delay times, the reduced maximum flame temperatures, and the lower production of aluminum monoxide (AlO) radicals for the acetonitrile-milled aluminum sample suggest that its AlNnCmOvHx surface layer limits oxidation of the aluminum core to a greater extent than the amorphous Al2O3 surface layer surrounding traditional aluminum nanoparticles.

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