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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 10
BKCSDE 33(10)
October 20, 2012 

Effects of Surface Nitrification on Thermal Conductivity of Modified Aluminum Oxide Nanofibers-Reinforced Epoxy Matrix Nanocomposites
Byung-Joo Kim, Kyong-Min Bae, Kay-Hyeok An*, Soo-Jin Park*
Aluminium oxide, Aluminum nitride, Thermal nitrification, Thermal conductivity
Aluminum oxide (Al2O3) nanofibers were treated thermally under an ammonia (NH3) gas stream balanced by nitrogen to form a thin aluminum nitride (AlN) layer on the nanofibers, resulting in the enhancement of thermal conductivity of Al2O3/epoxy nanocomposites. The micro-structural and morphological properties of the NH3- assisted thermally-treated Al2O3 nanofibers were characterized by X-ray diffraction (XRD) and atomic force microscopy (AEM), respectively. The surface characteristics and pore structures were observed by X-ray photoelectron spectroscopy (XPS), Zeta-potential and N2/77 K isothermal adsorptions. From the results, the formation of AlN on Al2O3 nanofibers was confirmed by XRD and XPS. The thermal conductivity (TC) of the modified Al2O3 nanofibers/epoxy composites increased with increasing treated temperatures. On the other hand, the severely treated Al2O3/epoxy composites showed a decrease in TC, resulting from a decrease in the probability of heat-transfer networks between the filler and matrix in this system due to the aggregation of nanofiber fillers.
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