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Experimental Heat Transfer
A Journal of Thermal Energy Generation, Transport, Storage, and Conversion
Volume 30, 2017 - Issue 1
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Articles

Carbon nanotube-epoxy composites: The role of acid treatment in thermal and electrical conductivity

, , , , , & show all
Pages 66-76 | Received 29 Dec 2014, Accepted 24 Feb 2016, Published online: 20 Sep 2016
 

Abstract

Wet acid oxidation treatment methods have been widely reported as an effective method to purify and oxidize the surface of industrial multi-walled carbon nanotubes. This work examines the use of a concentrated HNO3/H2SO4 mixture in an attempt to optimize the purification procedure of industrial multi-walled carbon nanotubes with diameter distribution statistics. It is shown that acid treatments of several hours are enough to purify the nanotubes. The electrical and thermal conductivities of epoxy composites containing 0.05–0.25 wt% of an acid-treated multi-walled carbon nanotube have been studied. The electrical conductivity of the composites decreases by more than three orders, whereas the thermal conductivity of the same specimen increases very modestly as a function of the filler content.

Acknowledgment

The authors acknowledge the support and contribution of Professor A. Zahab in assisting with electrical measurements.

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