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

Journal of Colloid and Interface Science
Daisuke NagaoMikio Konno

Abstract

Particle formation in the hydrolysis and condensation of tetraethyl orthosilicate (TEOS) was studied by varying pH (9.5-11) with the basic catalysts NH3, methylamine (MA), and dimethylamine (DMA) in the presence of 5 mol/m3 CH3COOH, 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/m3 and for NH3 at catalyst concentrations of 0.1-1.5 kmol/m3. In a common range of catalyst concentrations for spherical particle formation, average particle size was largest for DMA and smallest for NH3. 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 < NH3, and ionic strength, estimated from pH in the reactions, was in the order DMA approximately equal to MA > NH3. This suggested that the particle sizes were controlled by electrostatic particle interactions.

References

Nov 21, 1997·Journal of Colloid and Interface Science·K LeeA V McCormick
Oct 7, 2003·Journal of Colloid and Interface Science·D L GreenM T Harris

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Citations

Sep 12, 2012·Journal of Colloid and Interface Science·Suling ZhaoJianguo Guan
Oct 17, 2008·Journal of Colloid and Interface Science·Tian-Song DengJin-Lei Wu
Feb 12, 2017·Journal of Colloid and Interface Science·Leilei LuoReiner Anwander
Jan 26, 2010·Chemistry, an Asian Journal·Shū KobayashiYasuhiro Yamashita
Nov 4, 2005·Chemistry : a European Journal·Tomoaki HamadaShū Kobayashi
Aug 24, 2019·Journal of Materials Science. Materials in Medicine·Georgia K PouroutzidouKonstantinos M Paraskevopoulos
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yunchang FanSheli Zhang

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