Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 24, Pages 13421-13428Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp3026754
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Funding
- National Research Council (CONICET, Argentina)
- National Agency for the Promotion of Science and Technology (ANPCyT, Argentina)
- University of Mar del Plata (Argentina)
- European Regional Development Fund (ERDF) under the Northern Regional Operational Programme ON.2-O Novo Norte
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Superparamagnetic nanocomposites were obtained by dispersion of oleic acid (OA)-coated magnetite NPs in an epoxy system based on diglycidylether of bisphenol A (DGEBA) modified with OA. Dispersion of conventional oleic acid-stabilized magnetite NPs in a typical epoxy matrix is not possible due to the dissimilar chemical structures of the organic coating and the reactive solvent. However, by modification of a DGEBA-based epoxy with 20 wt % OA, we obtained a suitable reactive solvent to disperse up to at least 8 wt % of OA-stabilized magnetite NPs. A tertiary amine was used to catalyze the epoxy-acid reaction and initiate the homopolymerization of the epoxy excess. Both reactions occurred practically in series, first the epoxy-acid and then the epoxy homopolymerization. It was necessary to complete the first reaction to attain a very good dispersion of magnetite NPs in the reactive solvent previous to the occurrence of the final reaction. Magnetization curves and TEM images revealed a uniform dispersion of individual nanoparticles in the cross-linked epoxy. A sample containing 8 wt % OA-coated magnetite NPs exhibited a temperature increase of 25 degrees C at its surface when exposed to an alternating magnetic field. The temperature increase was enough to induce the shape memory effect of the nanocomposite.
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