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Synthesis and Shape Control of Goethite Nano Particles

Goethite의 합성 및 형상제어

  • Choi, Hyun-Bin (Korea Institute of Ceramic Engineering & Technology, Advanced Materials Convergence Division) ;
  • Chun, Myoung-Pyo (Korea Institute of Ceramic Engineering & Technology, Advanced Materials Convergence Division) ;
  • Chun, Seung-Yeop (Korea Institute of Ceramic Engineering & Technology, Advanced Materials Convergence Division) ;
  • Hwang, Jin-Ah (Korea Institute of Ceramic Engineering & Technology, Advanced Materials Convergence Division)
  • 최현빈 (한국세라믹기술원 나노융합소재센터) ;
  • 전명표 (한국세라믹기술원 나노융합소재센터) ;
  • 전승엽 (한국세라믹기술원 나노융합소재센터) ;
  • 황진아 (한국세라믹기술원 나노융합소재센터)
  • Received : 2016.07.08
  • Accepted : 2016.08.23
  • Published : 2016.09.01

Abstract

Goethite, ${\alpha}$-FeOOH have various applications such as absorbent, pigment and source for magnetic materials. Goethite particles were synthesized in a two step process, where $Fe(OH)_2$ were synthesized in nitrogen atmosphere using $FeSO_4$ as a raw material in the first process, and after that acicular goethite particles were obtained in an air oxidation process of $Fe(OH)_2$ in highly alkaline aqueous solution. Their phase and microstructure were investigated with XRD and FE-SEM. It was found that the morphology of goethite and the ratio of length-to-width (aspect ratio) of acicular goethite are dependent on the some factors such as R value ($OH^-/Fe^{2+}$), air flow rate and pH conditions. In particular, R value has the strongest influence on the synthesized goethite morphology. It is considered that the optimal value R is 4.5 because X-ray diffraction peaks of goethite have the highest intensity at that value. Morphology of goethite particles was controlled by air flow rates, showing that their size and aspect ratio are getting smaller and decrease, respectively as air flow rate increases. The largest goethite particle obtained is about 1,500 nm in length and 150 nm in diameter.

Acknowledgement

Supported by : 산업통상자원부

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