Journal of Nanoparticle Research

, Volume 12, Issue 2, pp 529–535

Carbon nanotube grease with enhanced thermal and electrical conductivities

  • Haiping Hong
  • Dustin Thomas
  • Andy Waynick
  • Wenhua Yu
  • Pauline Smith
  • Walter Roy
Research Paper

DOI: 10.1007/s11051-009-9803-y

Cite this article as:
Hong, H., Thomas, D., Waynick, A. et al. J Nanopart Res (2010) 12: 529. doi:10.1007/s11051-009-9803-y

Abstract

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 11 wt% (7 vol%) single-wall CNT (diameter 1–2 nm, length 0.5–40 μm) loading, the thermal conductivity (TC) of the grease shows a 60–70% 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 177 °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 (>10 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.

Keywords

Grease Carbon nanotube Thermal conductivity Electrical conductivity Synthesis 

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Haiping Hong
    • 1
  • Dustin Thomas
    • 1
  • Andy Waynick
    • 2
  • Wenhua Yu
    • 3
  • Pauline Smith
    • 4
  • Walter Roy
    • 4
  1. 1.Department of Material and Metallurgical EngineeringSouth Dakota School of Mines and TechnologyRapid CityUSA
  2. 2.Lubricant and Grease Lab, NCH CorporationIrvingUSA
  3. 3.Energy Systems DivisionArgonne National LaboratoryArgonneUSA
  4. 4.Army Research LabAberdeen Proving GroundUSA