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Thermal conductivity of nanoparticle suspensions in insulating media measured with a transient optical grating and a hotwire

J. Appl. Phys. 103, 083529 (2008); doi:10.1063/1.2908887

Published 23 April 2008

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Aaron J. Schmidt,1 Matteo Chiesa,1 Darius H. Torchinsky,2 Jeremy A. Johnson,3 Keith A. Nelson,3 and Gang Chen1
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
3Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
The thermal conductivities of nanoparticle suspensions of Al2O3 in C10H22 (decane) and isoparaffinic polyalphaolefin (PAO) have been measured using two dissimilar techniques: a transient hotwire measurement based on the heat loss and resistivity of a heated wire in solution, and the thermal decay of a transient grating generated by the interference of two picosecond light pulses. Agreement between the two techniques is good, indicating that either is a reliable way for measuring the thermal conductivity of colloidal suspensions. Suspensions with volume concentrations from 0.125% to 1% were measured. The Al2O3 particles were suspended by means of surfactants added to the base fluids and sonication. The thermal conductivity of the suspensions was greater than expected from classical continuum models, with a greater enhancement observed in decane than in PAO. ©2008 American Institute of Physics
History: Received 14 October 2007; accepted 6 March 2008; published 23 April 2008
Permalink: http://link.aip.org/link/?JAPIAU/103/083529/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.70.Kj
    Emulsions and suspensions
  • 82.70.Dd
    Colloids
  • 82.70.Uv
    Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems
  • 66.25.+g
    Thermal conduction in nonmetallic liquids
  • YEAR: 2008

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ISSN:
0021-8979 (print)   1089-7550 (online)
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