Ferrimagnetic magnetite hollow microspheres prepared via enzymatically precipitated iron hydroxide on a urease-bearing polymer template(<Feature>Aqueous Solution Science for Ceramic Processing II)

概要

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Hollow magnetite (Fe_3O_4) microspheres a few tens micrometers in diameter were fabricated by calcining iron hydroxide precipitated on spherical polydivinylbenzene (PDVB) template with enzymatically supplied ammonia. Monophasic Fe_3O_4 hollow spheres were obtained by calcining the precursor at 1073K for 3.6ks in an equimolar mixed gas of CO_2 and H_2. The prepared Fe_3O_4 hollow spheres had smooth surfaces. The particle size and monodispersity of Fe_3O_4 spheres reflected those of the PDVB template, and the latter was controllable 10-30μm in diameter during the process of the polymerization. The Fe_3O_4 spheres showed ferrimagnetic behavior. The use of urease to precipitate the precursor was found to be effective for preparing template-directed microspheres, and the Fe_3O_4 microspheres synthesized are considered to be promising thermoseeds for hyperthermic treatment.
社団法人日本セラミックス協会の論文
2009-03-01