Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Thickness Control of Core Shell type Nano CoFe2O4@SiO2 Structure

두께 조절이 가능한 코어셸 형태의 SiO2 coated CoFe2O4 구조

  • Yu, Ri (Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Yoo-Jin (Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology) ;
  • Pee, Jae-Hwan (Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Kyung-Ja (Engineering ceramic center, Korea Institute of Ceramic Engineering & Technology)
  • 유리 (한국세라믹기술원 엔지니어링 세라믹 센터) ;
  • 김유진 (한국세라믹기술원 엔지니어링 세라믹 센터) ;
  • 피재환 (한국세라믹기술원 엔지니어링 세라믹 센터) ;
  • 김경자 (한국세라믹기술원 엔지니어링 세라믹 센터)
  • Received : 2010.04.21
  • Accepted : 2010.05.31
  • Published : 2010.06.28
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Abstract

Homogenous silica-coated $CoFe_2O_4$ samples with controlled silica thickness were synthesized by the reverse microemulsion method. First, 7 nm size cobalt ferrite nanoparticles were prepared by thermal decomposition methods. Hydrophobic cobalt ferrites were coated with controlled $SiO_2$ using polyoxyethylene(5)nonylphenylether (Igepal) as a surfactant, $NH_4OH$ and tetraethyl orthosilicate (TEOS). The well controlled thickness of the silica shell was found to depend on the reaction time and the amount of surfactant used during production. Thick shell was prepared by increasing reaction time and small amount of surfactant.

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References

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