Retarding and accelerating effects of aluminum on the growth of polysilicic acid particles

Takushi Yokoyama, Yoko Takahashi, Toshikazu Tarutani

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Retarding and accelerating effects of aluminum on the growth of particles of polysilicic acids were studied in the pH range 7-9 at 50°C by gel chromatography, spectrophotometry, and 27Al NMR. The effects depended on the pH and aluminum concentration. The greater retarding effect was observed at lower pH, while the greater accelerating effect at higher pH. It was concluded that the retarding effect is due to the formation of a negatively charged aluminosilicate site by substitution of aluminum for 4-coordinated silicon on polysilicic acid, and that the accelerating effect is due to the formation of unidentified aluminum species, which could not be detected by 27Al NMR, on the surface of polysilicic acid.

Original languageEnglish
Pages (from-to)559-563
Number of pages5
JournalJournal of Colloid And Interface Science
Volume141
Issue number2
DOIs
Publication statusPublished - Feb 1991

All Science Journal Classification (ASJC) codes

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

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