Materials and Devices
Synthesis of Silica Particles in the Hydrolysis of Tetraethyl Orthosilicate with Amine Catalysts
2004 Volume 37 Issue 7 Pages 905-907
Details
2004 Volume 37 Issue 7 Pages 905-907
Methylamine (MA) and dimethylamine (DMA) were examined as catalysts for the hydrolysis of tetraethyl orthosilicate (TEOS) to synthesize monodispersed silica particles. Experimental results were compared with those in ammonia-catalyzed hydrolysis of TEOS. The hydrolysis reactions were carried out at a water concentration of 11 kmol/m3 in ranges of catalyst concentration (0.01–1.5 kmol/m3) and TEOS concentration (0.02–0.2 kmol/m3). Spherical particles were formed at catalyst concentrations lower than 1.5 kmol/m3 for NH3 and lower than 0.2 kmol/m3 for MA and DMA. Comparison of the coefficient of variation (CV) for monodisperse spherical particles indicated that silica particles obtained with the amine catalysts were more highly monodisperse than those obtained with NH3 catalyst.
