THERMAL TRANSPORT PROPERTIES OF MULTI-WALLED CARBON NANOTUBE ARRAYS
A laser flash technique was applied to measure the thermal diffusivity along a multi-walled carbon nanotube (CNT) array in temperature range of -55~200 o C. In the measurements, a nanosecond pulsed laser was used to realize noncontact heating and the temperature variations were recorded by an infrared detector. The experimental results show that the thermal diffusivity of the CNT array increases slightly with temperature in the -55~70 o C temperature range and exhibits no obvious change in the -75~200 o C temperature range. The CNT array hasmuch larger thermal diffusivity than several known excellent thermal conductors, reaching about 4.6 cm 2 s -1 at room temperature. The mean thermal conductivity (λ ) of individual CNTs was further estimated from the thermal diffusivity, specific heat (Cp), and density (ρ ) by using the correlation of p C αρ λ=. The thermal conductivity of individual CNTs increases smoothly with the temperatureincrease, reaching about 750 Wm -1 K -1 at room temperature.
Huaqing Xie An Cai Xinwei Wang
Department of Environmental Engineering, Shanghai Second Polytechnic University, Shanghai201209, Chi Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE,68588-0656, USA
国际会议
海南三亚
英文
2007-01-10（万方平台首次上网日期，不代表论文的发表时间）