Rapid and Continuous Hydrothermal Synthesis of Boehmite Particles in Subcritical and Supercritical Water

Tadafumi Adschiri, Katsuhito Kanazawa, Kunio Arai

Research output: Contribution to journalArticlepeer-review

180 Citations (Scopus)

Abstract

Hydrothermal synthesis of AlOOH particles from an Al(NO3)3 aqueous solution was examined in subcritical and supercritical water. Continuous and rapid production of AlOOH fine particles was achieved by mixing a metal salt aqueous solution with preheated water fed from another line. The effects of temperature, pressure, and initial concentration of solution on the particle size, morphology, and crystal structure of the metal (hydrous) oxides were examined. These properties are strongly affected by slight changes in pressure and temperature. This strong effect is attributed to the large changes in the properties of water near its critical point resulting from the slight changes in pressure and temperature. The results suggest the simultaneous control of size, crystal structure, and morphology of the particles by hydrothermal synthesis in supercritical water.

Original languageEnglish
Pages (from-to)2615-2618
Number of pages4
JournalJournal of the American Ceramic Society
Volume75
Issue number9
DOIs
Publication statusPublished - 1992 Sep

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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