Continuous hydrothermal synthesis of metal oxides in sub- and supercritical water

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Supercritical water can provide an unique reaction atmosphere for synthesizing metal oxide nanoparticles. Due to the drastic change of properties of water around the critical point, including density, dielectric constant and ionic product, the reaction phase with O2 or H2 gas and the reaction rate and equilibrium can be varied to synthesize new materials or define particle morphologies. In this work, hydrothermal crystallization experiments are performed with several types of flow apparatus that allow convenient manipulation of variables such as temperature, pressure, and residence time. Key features in the flow modes and material preparation are discussed. The proposed supercritical hydrothermal synthesis method has the following desirable features: i) nanoparticles can be produced, ii) morphology of the produced particles can be controlled with small changes in pressure or temperature, and iii) a reducing or oxidizing atmosphere can be applied by introducing oxygen or hydrogen or other glass. An overview of this method is given for functional material synthesis of significant industrial interest including barium hexaferrite magnetic particles, YAG/Tb phosphor fine particles and lithium cobalt fine crystals.

Original languageEnglish
Title of host publicationProceedings of the Second International Conference on Processing Materials for Properties
EditorsB. Mishra, C, Yamauchi, B. Mishra, C. Yamauchi
Pages459-462
Number of pages4
Publication statusPublished - 2000 Dec 1
EventProceedings of the Second International Conference on Processing Materials for Properties - San Francisco, CA, United States
Duration: 2000 Nov 52000 Nov 8

Other

OtherProceedings of the Second International Conference on Processing Materials for Properties
CountryUnited States
CitySan Francisco, CA
Period00/11/500/11/8

Keywords

  • Bariumhexaferrite
  • Hydrothermal synthesis
  • LiCoO
  • Phosfer
  • Supercritical water

ASJC Scopus subject areas

  • Engineering(all)

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