발간논문

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Vol.31, No.5, 632 ~ 640, 1993
Title
The Formation of Needle - like α - Fe2O3 Particles by Hydrothermal Reaction ( The Effect of pH on the Particle morphology )
변태봉T . B . Byeon, 이재영J . Y . Lee, 김대영D . Y . Kim, 손진군J . G . Sohn, 이현H . Lee, 한기현K . H . Han
Abstract
Hematite particles were obtained by hydrothermal reaction from ferric hydroxide in the presence of citric acid which is acted as crystal growth controller. Citric acid was adsorbed with citrate anion on the ferric hydroxide. Adsorbed citrate anion influenced crystallization temperature and morphology of α-Fe₂O₃in the solid reaction. Adsorbed citrate anion inhibited crystallization of α-Fe₂O₃from ferric hydroxide at pH 9.0-10.5 and induced to needle-like α-Fe₂O₃particles at pH 10.75-11.75 in the hydrothermal reaction.
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