Production of Fine Metal Oxide Particles in Supercritical Water

초임계수를 이용한 금속산화물 미세입자 제조

  • Lee, Joo-Heon (Battery and Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Park, Young-Woo (Battery and Fuel Cell Research Center, Korea Institute of Science and Technology)
  • 이주헌 (한국과학기술연구원 전지.연료전지 연구센터) ;
  • 박영우 (한국과학기술연구원 전지.연료전지 연구센터)
  • Received : 1998.11.05
  • Accepted : 1998.11.26
  • Published : 1999.02.10

Abstract

The production of fine metal oxide particles in supercritical water has been studied. Cobalt nitrate solution and manganese nitrate solution have been selected as model solutions for metal salt aqueous solution and the particles of cobalt oxide and manganese oxide have been produced. It was observed that the production of fine metal oxide particles in supercritical water was feasible and the dehydration rate was remarkably high in supercritical water. In spite of a short residence time (3~100 seconds), fine particles ($0.5{\sim}2{\mu}m$) have been produced. In the supercritical water process, the temperature of mixer had a significant effect on particle size and size distribution. It was observed that a change in reaction temperature resulted in the control of particle size.

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