Abstract
Ultrafast mid-infrared (IR) spectroscopy is used to monitor chemical reactions initiated by flash-heating a nanoenergetic material consisting of 30 nm diameter Al nanoparticle fuel in a TeflonAF oxidizer. TeflonAF is a copolymer of tetrafluoroethylene (TFE) and 2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxole (dioxole), so Al can react with several different moieties. Transitions associated with CF2 stretching of TFE or CFO stretching or CF3 stretching of dioxole were monitored. The reactions of Al with CFO occurred with time constant (k1)-1 = 50 (±20 ps); reactions of Al with CF2 or CF3 were more than 10 times slower, (k2)-1 = 0.7 (±0.05 ns). An interesting frequency oscillation is seen in the 1148 cm-1 band, where the peak frequency undergoes a time-dependent shift from 1148 to 1155 cm-1 and then back to 1148 cm-1. Due to the coincidence of CFO and CF2 stretching transitions, this band in the copolymer represents an amalgamated vibration with amplitude on both TFE and dioxole. As concentration is varie...
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