Effect of titanium dioxide solubility on the formation of BaTiO3 nanoparticles in supercritical water

Mehrnoosh Atashfaraz, Mojtaba Shariaty-Niassar, Satoshi Ohara, Kimitaka Minami, Mitsuo Umetsu, Takashi Naka, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Fine BaTiO3 nanoparticles were prepared by hydrothermal synthesis under supercritical condition (400 °C and 30 MPa) from mixture of barium hydroxide and titanium dioxide as starting precursors. First, conditions for synthesizing BaTiO3 were examined by using batch reactors. High pH condition, pH > 13, is necessary to obtain phase pure BaTiO3. The reason was discussed based on the solubility of titanium dioxide, which that dissolution-recrystallization process is essential for the synthesis of BaTiO3 nanoparticles. Rapid heating of the starting precursors by mixing with high temperature water in a flow reactor is effective to synthesize smaller size and narrower particle size distribution for the BaTiO3 nanoparticles, compared with the case of slow heating with a batch reactor.

Original languageEnglish
Pages (from-to)233-237
Number of pages5
JournalFluid Phase Equilibria
Volume257
Issue number2
DOIs
Publication statusPublished - 2007 Aug 25

Keywords

  • BaTiO nanoparticles
  • Formation mechanism
  • Solubility
  • Supercritical water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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