Synthesis and magnetic properties of platelet gamma -Fe[sub]2O[sub]3 particles for medical applications using hysteresis-loss heating

Platelet gamma -Fe[sub]2O[sub]3 particles of particle size less than 100 nm were prepared for medical applications that use the hysteresis-loss heating of ferromagnetic particles. The gamma -Fe[sub]2O[sub]3 particles were obtained through the dehydration, reduction, and oxidation of platelet alpha -...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-04, Vol.324 (7), p.1285-1289
Main Authors: Kishimoto, Mikio, Minagawa, Makoto, Yanagihara, Hideto, Oda, Tatsuya, Ohkochi, Nobuhiro, Kita, Eiji
Format: Article
Language:English
Subjects:
Coercive force
Dehydration
Ferromagnetism
Heating
Magnetic fields
Medical
Platelets
Saturation (magnetic)
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Summary:Platelet gamma -Fe[sub]2O[sub]3 particles of particle size less than 100 nm were prepared for medical applications that use the hysteresis-loss heating of ferromagnetic particles. The gamma -Fe[sub]2O[sub]3 particles were obtained through the dehydration, reduction, and oxidation of platelet alpha -FeOOH particles, which were synthesized by the precipitation of ferric ions in an alkaline solution containing ethanolamine, and the crystals grown using a hydrothermal treatment. The gamma -Fe[sub]2O[sub]3 particles contained dimples formed by the dehydration of alpha -FeOOH particles. The coercive force and the saturation magnetization of the gamma -Fe[sub]2O[sub]3 particles were in the ranges 11.9 to 12.7 kA/m (150 to 160 Oe), and 70 to 72 Am[super]2/kg (70 to 72 emu/g), respectively. The specific loss power of the gamma -Fe[sub]2O[sub]3 particles, estimated from their temperature-raising property measured under a peak magnetic field of 50.9 kA/m (640 Oe) and at a frequency of 117 kHz, was 590 W/g. This value is higher than that of spherical cobalt-containing iron oxide particles having equivalent coercive force and saturation magnetization, reflecting the larger area of the minor hysteresis loop measured under a peak magnetic field of 50.9 kA/m (640 Oe).
ISSN:0304-8853
DOI:10.1016/j.jmmm.2011.11.036