Chemically Driven, Carbon Nanotube-Guided Thermopower Waves

Thursday, November 11, 2010: 9:50 AM
150 F Room (Salt Palace Convention Center)
Wonjoon Choi1, Seunghyun Hong2, Joel T. Abrahamson3, Jae-Hee Han3, Changsik Song3, Nitish Nair3, Seunghyun Baik2 and Michael S. Strano3, (1)Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, (2)Advanced Institute of Nanotechnology, Department of Energy Science and School of Mechanical Engineering, Sungkyunkwan University, Suwon, South Korea, (3)Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA

Coupling an exothermic chemical reaction with a nanotube or nanowire possessing a high axial thermal conductivity creates a self-propagating reactive wave along its length. Such waves are realized using a 7-nm cyclotrimethylene-trinitramine annular shell around a multi-walled carbon nanotube and are amplified by more than 104 times the bulk value, propagating more than 2 m/s, with an effective thermal conductivity of 1.28 0.2 kW/m/K at 2860 K. This wave produces a concomitant electrical pulse of disproportionately high specific power, as large as 7 kW/kg, that we identify as a thermopower wave. Here, thermally excited carriers flow in the direction of the propagating reaction with specific power that scales inversely with size. The reaction also produces an anisotropic pressure wave of decomposition gases of exceedingly high total impulse per mass of 300 N-s/kg and specific impulse per total mass (5.5 s/g) suggesting possible applications to micro-propulsion and actuators.

Extended Abstract: File Not Uploaded
See more of this Session: Nanomaterials for Energy Storage I
See more of this Group/Topical: Topical 5: Nanomaterials for Energy Applications