期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 35, 页码 20401-20408出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b04117
关键词
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资金
- Army Research Office
- Defense Threat Reduction Agency
- U.S. Army Research Office [W911NF1310493]
- Maryland NanoCenter
Al/CuO reactive nanolaminate ignition was studied using temperature jump (T-Jump) heating for rates greater than 10(5) K/s. Multi layer samples were sputter deposited onto thin platinum filaments in alternating layers of Al and CuO. The filaments were resistively heated in a time-of-flight mass spectrometer (ToF-MS), while ignition and reaction were observed with high-speed video. A total deposited thickness of 1800 nm was maintained for all samples, while the number of bilayers was varied from 1 to 12. Increasing this value decreased the diffusion distances and increased the amount of interfacial area across which reaction could occur, while keeping the overall energy of the system constant. From 2 to 6 bilayers, the ignition temperature decreased from 1250 to 670 K and the overall reactivity increased. Past 6 bilayers, the ignition temperature only decreased slightly and there was little impact on the overall reactivity. This behavior is consistent with a mass-transport model where the predominant diffusing species exhibits a low activation energy (50 kJ/mol). Ignition temperature, which depends upon bilayer thickness, is found to be a good predictor of flame speed.
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