Preparation and characterization of hollow magnetite spheres via a template-free route
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概要
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Hollow magnetite (Fe3O4) spheres have been synthesized successfully via a template-free hydrothermal reaction using Fe-naphthenate and LiOH as the starting materials. The average diameter of hollow magnetite spheres prepared at 120°C was about 10 µm, and the specific surface area of the product was 68.3 m2/g. The size and morphology of the products depended on the reaction temperature, concentration of LiOH solution and the volume ratio of the oil (Fe-naphthenate) and water phase (LiOH solution). The hollow magnetite spheres exhibit ferromagnetic behavior with saturation magnetization (Ms), remanent magnetization (Mr), and coercivity (Hc) values of ca. 22 emu/g, 5 emu/g, and 530 Oe, respectively, according to the magnetic hysteresis curve measured at 5 K. The possible formation mechanism of hollow magnetite spheres is also discussed.
著者
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Dong Qiang
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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Kumada Nobuhiro
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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Yonesaki Yoshinori
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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TAKEI Takahiro
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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KINOMURA Nobukazu
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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Kumada N
Interdisciplinary Graduate School Of Medical And Engineering Univ. Of Yamanashi
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Kumada Nobuhiro
Department Of Research Interdisciplinary Graduate School Of Medicine And Engineering University Of Y
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Kinomura Nobukazu
Dep. Of Res. Interdisciplinary Graduate School Of Medicine And Engineering Univ. Of Yamanashi
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Yonesaki Yoshinori
Dep. Of Res. Interdisciplinary Graduate School Of Medicine And Engineering Univ. Of Yamanashi
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Takei Takahiro
Department Of Research Interdisciplinary Graduate School Of Medicine And Engineering
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Kinomura Nobukazu
Department Of Research Interdisciplinary Graduate School Of Medicine And Engineering
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Kumada Nobuhiro
Department of Research Interdisciplinary Graduate School of Medicine and Engineering
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DONG Qiang
Department of Research Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi
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YONESAKI Yoshinori
Department of Material Chemistry, Graduate School of Engineering, Kyoto University
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