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Heat Dissipation And Magnetic Properties Of Surface-coated Fe3O4 Nanoparticles For Biomedical Applications

A. Tomitaka, Koji Ueda, T. Yamada, Y. Takemura
Published 2012 · Materials Science

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Abstract In this study, the influence of surface coating on the magnetic and heat dissipation properties of Fe 3 O 4 nanoparticles was investigated. Fe 3 O 4 nanoparticles that ranged in size between (particle sizes of 20 and 30 nm) were coated with polyethylenimine (PEI), oleic acid, and Pluronic F-127. Surface coatings that were composed of thick layers of oleic acid and Pluronic F-127 reduced dipole interactions between the particles, and resulted in reduced coercivity and decreased Neel relaxation times. The ac magnetization measurements revealed that the heat dissipation of the PEI-coated Fe 3 O 4 nanoparticles was induced by hysteresis loss and Brownian relaxation loss and that of the oleic-acid-coated Fe 3 O 4 nanoparticles was mainly induced by hysteresis loss and Neel relaxation loss.
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