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Preparation of Y 3 Fe 5 O 12 Microsphere Using Bead‐Milled Nanosize Powder for Embolization Therapy Application
Author(s) -
Aono Hiromichi,
Senba Ryota,
Nishimori Tadahiko,
Naohara Takashi
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12511
Subject(s) - ferrimagnetism , calcination , superparamagnetism , materials science , microsphere , nanoparticle , particle size , analytical chemistry (journal) , chemical engineering , magnetic field , nanotechnology , magnetization , chemistry , chromatography , catalysis , biochemistry , physics , quantum mechanics , engineering
Y 3 Fe 5 O 12 microspheres having a 20–32 μm diameter range were prepared by a spray dryer using a bead‐milled nanosize powder. The high heat generation ability in an AC magnetic field was obtained by the bead milling of a commercial powder. The yield of the 20–32 μm microspheres was 13.5% after sifting using 20 and 32 μm sieves. The heat generation ability of the microsphere sample was almost the same as that for the bead‐milled powder because the temperature enhancement mechanism was the Néel relaxation of the superparamagnetic material. Furthermore, the heat generation ability of the Y 3 Fe 5 O 12 microsphere was improved by calcination at low temperature. The heat ability increased as a function proportional to the square of the increasing magnetic field for the noncalcined sample and the samples calcined at 600°C. For the samples calcined at 650°C or higher, the heat generation ability increased as a function proportional to the cube of the increasing magnetic field because of the particle growth to form single‐domain ferrimagnetic particles. The sample calcined at 650°C showed the maximum heat generation ability(W/g) of 2.4· f · H 3 , where f and H are the frequency (kHz) and magnetic field (kA/m), respectively.