Effect of crystallite size on the thermal phase change and porous properties of boehmite

Kiyoshi Okada, Toru Nagashima, Yoshikazu Kameshima, Atsuo Yasumori

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The effect of crystallite size on the thermal phase change and porous properties of boehmite was investigated using boehmites with crystallite sizes of 2.9 to 24.4 nm and boehmite gels prepared by precipitation and hydrothermal methods. The dehydroxylation temperature of boehmite increases, its phase transition temperature from γ- to θ-Al2O3 decreases and the θ- to α-Al2O3 transition temperature increases as the crystallite size of the boehmite increases. Boehmite with a crystallite size of ∼5 nm shows the highest specific surface area and greatest thermal stability. This boehmite contains pores of about 2-3 nm radius, suggested to be responsible for the superior porous properties and thermal stability.

Original languageEnglish
Pages (from-to)111-115
Number of pages5
JournalJournal of Colloid And Interface Science
Volume248
Issue number1
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

Keywords

  • Boehmite
  • Crystallite size
  • Porous property
  • Thermal phase change
  • Thermal stability

ASJC Scopus subject areas

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

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