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Enhanced thermal conductivity by aggregation in heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes

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10 Author(s)
Wensel, Jesse ; Department of Material and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA ; Wright, Brian ; Thomas, Dustin ; Douglas, Wayne
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An approximately 10% increase in the thermal conductivity (TC) of heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes has been determined with very low percentage loading (around 0.02 wt %) of these two nanomaterials. These fluids are very stable and the viscosity remains approximately the same as water. A possible explanation for these interesting results is the aggregation of metal oxide particles on the surface of nanotubes by electrostatic attraction and form the aggregation chain along the nanotube. Time dependant magnetic results demonstrate that, under the influence of a strong outside magnetic field, the TC value decreases. Also, the TC value decreases when the pH is shifted from 7 to 11.45.

Published in:

Applied Physics Letters  (Volume:92 ,  Issue: 2 )

Date of Publication:

Jan 2008

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