Solvent effects on particle formation in hydrolysis of tetraethyl orthosilicate

Eiichi Mine, Daisuke Nagao, Yoshio Kobayashi, Mikio Konno

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Particle formation in ammonia-catalyzed hydrolysis of tetraethyl orthosilicate (TEOS) was studied in aqueous solvents that contained ethanol, 1-propanol or 1-butanol. The reactions were performed at a TEOS concentration of 0.2 kmol/m3, a H2O concentration of 5 kmol/m3 and a NH3 concentration of 1 kmol/m3. Average particle size was the largest for 1-butanol and the smallest for ethanol. No specific relation of the average diameter to hydrolysis rate was observed in the reactions. Difference in dielectric constant of the solvent and particle surface potential in the reactions indicated that the magnitudes of interparticle repulsion in the solvents corresponded with the order of the average particle sizes. This suggested that the particle sizes were dominated by the interparticle repulsion.

Original languageEnglish
Pages (from-to)197-201
Number of pages5
JournalJournal of Sol-Gel Science and Technology
Volume35
Issue number3
DOIs
Publication statusPublished - 2005 Sep 1

Keywords

  • Hydrolysis
  • Particle formation
  • Solvent effect
  • Tetraethyl orthosilicate
  • Zeta-potential

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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