Hong, Haiping and Thomas, Dustin and Waynick, Andy and Yu, Wenhua and Smith, Pauline and Roy, Walter (2010) Carbon nanotube grease with enhanced thermal and electrical conductivities. Journal of Nanoparticle Research, 12 (2). pp. 529-535.
A stable and homogeneous grease based on carbon nanotubes (CNTs, single-wall and multi-wall) in polyalphaolefin oil has been produced without using a chemical surfactant. For example, for a 11Â wt% (7Â vol%) single-wall CNT (diameter 1â2Â nm, length 0.5â40Â Î¼m) loading, the thermal conductivity (TC) of the grease shows a 60â70% increase compared to that for no nanotube loading. In addition, the grease is electrically conductive, has a high dropping point, good temperature resistance, and does not react with copper at temperatures up to 177Â Â°C. The performance of carbon nanotube grease could be much better with the improvement of nanotube quality and purity. A possible explanation for these results is that of a high loading of CNTs (>10Â wt%), they become associated with each other by van der Waals forces in the grease to form three-dimensional percolation networks. Time-dependent magnetic results demonstrate that, even under the influence of a strong outside magnetic field, the TC value remains constant. This phenomenon can be attributed to the existence of networks that makes magnetic alignment of nanotubes impossible.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||10 Feb 2010 10:02|
|Last Modified:||10 Feb 2010 10:02|
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