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Color Evolution and Phase Transformation of α-FeOOH@SiO2 and β-FeOOH@SiO2 pigments

SiO2가 코팅된 α-FeOOH와 β-FeOOH의 상전이를 통한 SiO2가 코팅된 α-Fe2O3의 색상 연구

  • Yu, Ri (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Choi, Kyoon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Pee, Jae-Hwan (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, YooJin (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology)
  • 유리 (한국세라믹기술원, 엔지니어링 세라믹 센터) ;
  • 최균 (한국세라믹기술원, 엔지니어링 세라믹 센터) ;
  • 피재환 (한국세라믹기술원, 엔지니어링 세라믹 센터) ;
  • 김유진 (한국세라믹기술원, 엔지니어링 세라믹 센터)
  • Received : 2013.05.09
  • Accepted : 2013.06.05
  • Published : 2013.06.28

Abstract

This manuscript reports on compared color evolution about phase transformation of ${\alpha}-FeOOH@SiO_2$ and ${\beta}-FeOOH@SiO_2$ pigments. Prepared ${\alpha}$-FeOOH and ${\beta}$-FeOOH were coated with silica for enhancing thermal properties and coloration of both samples. To study phase and color of ${\alpha}$-FeOOH and ${\beta}$-FeOOH, we prepared nano sized iron oxide hydroxide pigments which were coated with $SiO_2$ using tetraethylorthosilicate and cetyltrimethyl-ammonium bromide as a surface modifier. The silica-coated both samples were calcined at high temperatures (300, 700 and $1000^{\circ}C$) and characterized by scanning electron microscopy, CIE $L^*a^*b^*$ color parameter measurements, transmission electron microscopy and UV-vis spectroscopy. The yellow ${\alpha}$-FeOOH and ${\beta}$-FeOOH was transformed to ${\alpha}-Fe_2O_3$ with red, brown at 300, $700^{\circ}C$, respectively.

Acknowledgement

Supported by : 한국세라믹기술원

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