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

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 HNO 3 /H 2 SO 4 mixture in an attempt to optimize the purification procedure of industrial...

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Bibliographic Details
Published in:Experimental heat transfer 2017-01, Vol.30 (1), p.66-76
Main Authors: Metz, R., Diaz, L., Aznar, R., Alvarez, L., Flaud, V., Ananthakumar, S., Bantignies, J.-L.
Format: Article
Language:English
Subjects:
Acids
Carbon
composite
conduction
Conductivity
Electrical conductivity
Electrical resistivity
Heat transfer
microscale heat transfer
Multi wall carbon nanotubes
nanoscale heat transfer
Nanotubes
Purification
Statistics
Thermal conductivity
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Summary: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 HNO 3 /H 2 SO 4 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.
ISSN:0891-6152
1521-0480
DOI:10.1080/08916152.2016.1161675