摘要
Monodisperse silica spheres were prepared by hydrolysis and condensation of tetraethoxysilane (TEOS) in a mixture of water, ammonia and ethanol or acetone at 25℃. The spheres were studied with 13C CP-MAS NMR and their carbon contents were determined. It was found that TEOS was hydrolyzed completely during the sythesis process of monodisperse silica particles and that the carbon inside the silica is in the form of free solvent sheilded in the silica, this is, in accord with the mechanism of aggregation growth.
Monodisperse silica spheres were prepared by hydrolysis and condensation of tetraethoxysilane (TEOS) in a mixture of water, ammonia and ethanol or acetone at 25℃. The spheres were studied with 13C CP-MAS NMR and their carbon contents were determined. It was found that TEOS was hydrolyzed completely during the sythesis process of monodisperse silica particles and that the carbon inside the silica is in the form of free solvent sheilded in the silica, this is, in accord with the mechanism of aggregation growth.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1995年第7期646-649,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
关键词
二氧化硅
化学结构
碳
硅酸酯
Alkoxysilanes, Monodisperse silica, Microstructure
