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Thermal conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites

Mario Martin-Gallego1, Raquel Verdejo1, Mohamed Khayet2, Jose Maria Ortiz de Zarate2, Mohamed Essalhi2 and Miguel Angel Lopez-Manchado1*

Author Affiliations

1 Instituto de Ciencia y Tecnologia de Polimeros, ICTP-CSIC, Juan de la Cierva 3, Madrid, 28006, Spain

2 Faculty of Physics, Complutense University, Madrid, 28040, Spain

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Nanoscale Research Letters 2011, 6:610  doi:10.1186/1556-276X-6-610

Published: 1 December 2011

Abstract

We employed an easy and direct method to measure the thermal conductivity of epoxy in the liquid (nanofluid) and solid (nanocomposite) states using both rodlike and platelet-like carbon-based nanostructures. Comparing the experimental results with the theoretical model, an anomalous enhancement was obtained with multiwall carbon nanotubes, probably due to their layered structure and lowest surface resistance. Puzzling results for functionalized graphene sheet nanocomposites suggest that phonon coupling of the vibrational modes of the graphene and of the polymeric matrix plays a dominant role on the thermal conductivities of the liquid and solid states.

PACS: 74.25.fc; 81.05.Qk; 81.07.Pr.

Keywords:
carbon nanotubes; graphene; nanocomposites; nanofluids; thermal conductivity