Relationship between formation conditions, properties, and crystallite size of boehmite

Kiyoshi Okada, Toru Nagashima, Yoshikazu Kameshima, Atsuo Yasumori, Takayuki Tsukada

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Boehmites (γ-AlOOH) with a variety of crystallite sizes were prepared under various precipitation conditions from solutions of aluminum nitrate and sodium aluminate and also by hydrothermal treatment of a commercial boehmite powder. The relationships between the crystallite size and other properties of the boehmites were investigated. Crystalline boehmite was formed in the pH range 7 to 10 while gels precipitated below pH 7 and bayerite (Al(OH)3) formed at pH 11. The crystallite size of the boehmite increased at higher pH, higher temperature of the precursor solution, and longer aging time. As the crystallite size of the boehmite increased, the specific surface area, pore volume, and excess water decreased. Boehmites of small crystallite size, called pseudoboehmite, showed broadened X-ray peak widths and increased d-spacing of the 020 reflection. These changes are attributed to the small crystallite size (smaller numbers of stacking layers) and also to excess water in the interlayers of the boehmite structure.

Original languageEnglish
Pages (from-to)308-314
Number of pages7
JournalJournal of Colloid And Interface Science
Volume253
Issue number2
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

Keywords

  • Boehmite
  • Crystallite size
  • Excess water
  • Porous property
  • Solution pH

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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