Particle formation in the hydrolysis of tetraethyl orthosilicate in pH buffer solution

Daisuke Nagao, Hideyuki Osuzu, Akira Yamada, Eiichi Mine, Yoshio Kobayashi, Mikio Konno

研究成果: Article査読

41 被引用数 (Scopus)

抄録

Particle formation in the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) was studied by varying pH (9.5-11) with the basic catalysts NH 3, methylamine (MA), and dimethylamine (DMA) in the presence of 5 mol/m 3 CH 3COOH, which was chosen to suppress time variations of pH and ionic strength during the reaction. Spherical particles were formed for MA and DMA at catalyst concentrations of 0.02-0.2 kmol/m 3 and for NH 3 at catalyst concentrations of 0.1-1.5 kmol/m 3. In a common range of catalyst concentrations for spherical particle formation, average particle size was largest for DMA and smallest for NH 3. Hydrolysis rate of TEOS could be quantified by the use of buffer systems as a function of TEOS and OH - concentrations. A specific relation was not found between the hydrolysis and the particle size. The zeta potential of silica particles measured in the reaction solvent was in the order DMA < MA < NH 3, and ionic strength, estimated from pH in the reactions, was in the order DMA ≅ MA > NH 3. This suggested that the particle sizes were controlled by electrostatic particle interactions.

本文言語English
ページ(範囲)143-149
ページ数7
ジャーナルJournal of Colloid And Interface Science
279
1
DOI
出版ステータスPublished - 2004 11 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 表面、皮膜および薄膜
  • コロイド化学および表面化学

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