Abstract
The thermal properties of carbon nanotube- (CNT-) sheet were explored and compared to copper in this study. The CNT-sheet was made from dry spinning CNTs into a nonwoven sheet. This nonwoven CNT-sheet has anisotropic properties in in-plane and out-of-plane directions. The in-plane direction has much higher thermal conductivity than the out-of-plane direction. The in-plane thermal conductivity was found by thermal flash analysis, and the out-of-plane thermal conductivity was found by a hot disk method. The thermal irradiative properties were examined and compared to thermal transport theory. The CNT-sheet was heated in the vacuum and the temperature was measured with an IR Camera. The heat flux of CNT-sheet was compared to that of copper, and it was found that the CNT-sheet has significantly higher specific heat transfer properties compared to those of copper. CNT-sheet is a potential candidate to replace copper in thermal transport applications where weight is a primary concern such as in the automobile, aircraft, and space industries.
Highlights
Carbon nanotubes have received immense attention from researchers due to their extraordinary mechanical and physical properties [1,2,3]
It has been found that carbon nanotube- (CNT-)yarns contain substructures within the yarn: (1) individual CNTs, (2) bundled CNTs, (3) ribbons composed of bundled CNTs, and (4) yarns made from twisted ribbons [5]
(25 W/mK); CNT-sheet still benefits from a larger thermal emittance which could allow for more thermal flux or cooling occurring
Summary
Carbon nanotubes have received immense attention from researchers due to their extraordinary mechanical and physical properties [1,2,3]. There has been limited reporting on the thermal transport properties of CNT-yarns and sheets; considerable research has been done on the thermal transport properties of individual CNTs. Marconnet et al have performed a review of literature detailing previous work [17]. It has been found that, by adding 1% of CNTs to epoxy, the thermal conductivity can be raised by 125% at room temperature [22] While this is an impressive increase, the thermal conductivity of the CNT-epoxy composite (∼0.5 W/mK) is much lower than copper. Some limited research has been done on the thermal conductivity of pure CNT materials [25,26,27,28] These yarns are 10 μm in diameter and were found to have a room temperature thermal conductivity of 60 ± 20 W/mK [25]. The CNT-sheet’s thermal properties are compared with those of a comparable copper sheet painted with flat black on one side
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