由硅酸酯合成单分散二氧化硅中碳的化学形态  

Chemical State of Carbon in Monodisperse Silica Spheres Prepared from Alkoxysilanes

作　　者：陈胜利[1] 董鹏[1] 杨光华[1] 杨九金[1] 

机构地区：[1]石油大学重质油加工国家重点实验室,北京昌平102200

出　　处：《物理化学学报》1995年第7期646-649,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

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.

关 键 词：二氧化硅 化学结构 碳 硅酸酯 

分 类 号：O613.71[理学—无机化学] O613.72[理学—化学]