Oxidation-resistant Silica-coating on Highly Dispersed Spindle-type Fe-Co Nanoparticles

DOI Web Site 17 References
  • Sato Kimitoshi
    National Institute for Materials Science, Nano Ceramics Center
  • Iijima Motoyuki
    Tokyo University of Agriculture and Technology, BASE
  • Leng Yonghua
    National Institute for Materials Science, Nano Ceramics Center
  • Li Ji-Guang
    National Institute for Materials Science, Nano Ceramics Center
  • Kurashima Keiji
    National Institute for Materials Science, Transmission Electron Microscopy Cluster
  • Yoshida Takayuki
    DOWA Electronics Materials Co., Ltd., Magnetic Materials Laboratory
  • Kamiya Hidehiro
    Tokyo University of Agriculture and Technology, BASE
  • Ishigaki Takamasa
    National Institute for Materials Science, Nano Ceramics Center Hosei University, Department of Chemical Science and Technology

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Other Title
  • 針状鉄コバルトナノ粒子の耐酸化シリカ被覆
  • シンジョウテツ コバルトナノ リュウシ ノ タイサンカ シリカ ヒフク

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Abstract

Highly dispersed ethanol suspensions of spindle-type Fe-Co particles were obtained by the addition of oleic acid with applying ultrasonication. By using this suspension, spindle-type Fe-Co nanoparticles were coated by a uniform silica layer without agglomeration by a sol gel method, in which the total surface area of core Fe-Co nanoparticles and the reaction rate of TEOS were fully controlled. The silica-coated Fe-Co nanoparticles were annealed at 773K in nitrogen-4 % hydrogen mixture gas to reduce surface oxide layer of Fe-Co nanopartilces. The silica-coating densified by the heat treatment led to the substantial improvement of the oxidation-resistant property.

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