期刊
NATURE MATERIALS
卷 9, 期 5, 页码 423-429出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat2714
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资金
- Air Force Office of Scientific Research
- NSF
- Ministry of Education, Science and Technology, Korea [R31-2008-000-10029-0]
- National Science Foundation
- ILJU
- Korea Research Foundation (MOEHRD) [KRF-2006-214-D00117]
- National Research Foundation of Korea [과C6A1804, R31-2008-000-10029-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Theoretical calculations predict that by coupling an exothermic chemical reaction with a nanotube or nanowire possessing a high axial thermal conductivity, a self-propagating reactive wave can be driven along its length. Herein, such waves are realized using a 7-nm cyclotrimethylene trinitramine annular shell around a multiwalled carbon nanotube and are amplified by more than 10(4) times the bulk value, propagating faster than 2 m s(-1), with an effective thermal conductivity of 1.28 +/- 0.2 kW m(-1) K-1 at 2,860 K. This wave produces a concomitant electrical pulse of disproportionately high specific power, as large as 7 kW kg(-1), which we identify as a thermopower wave. Thermally excited carriers flow in the direction of the propagating reaction with a specific power that scales inversely with system size. The reaction also evolves an anisotropic pressure wave of high total impulse per mass (300 N s kg(-1)). Such waves of high power density may find uses as unique energy sources.
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