| 由硅酸酯合成单分散二氧化硅中碳的化学形态 |
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| 引用本文： | 陈胜利,董鹏,杨光华,杨九金.由硅酸酯合成单分散二氧化硅中碳的化学形态[J].物理化学学报,1995,11(7):646-649. |
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| 作者姓名： | 陈胜利 董鹏 杨光华 杨九金 |
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| 作者单位： | National Heavy Oil Research Laboratory,Petroleum University,China 102200 |
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| 摘 要： | 单分散二氧化硅是指尺寸分布十分狭窄的二氧化硅颗粒．单分散颗粒在科学研究及工业应用中得到了广泛的应用［1］．单分散二氧化硅由正硅酸有机酯在氨催化下于醇溶液中水解缩合得到．硅酸酯的水解和缩合反应可用如下反应描述．总的反应式为：nSi（OR）4＋2nH20→nSiO2＋4nROH1956年Kolbe［2］发现正硅酸乙酯（TEOS）在碱催化下于乙醇溶剂中水解反应有时会形成均一颗粒二氧化硅以来，许多学者对这一反应体系进行了较为广泛的研究，提出了双分子缩合成核机理、单分子叠加生长机理、表面反应控制生长机理、扩散控制生长机理和微晶核团聚生…
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| 关 键 词： | 硅酸有机能 单分散二氧化硅 化学结构 |
| 收稿时间： | 1994-04-16 |
| 修稿时间： | 1994-08-30 |
Chemical State of Carbon in Monodisperse Silica Spheres Prepared from Alkoxysilanes |
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| Chen Shengli,Dong Peng,Yang Guanghua,Yang Jiujing.Chemical State of Carbon in Monodisperse Silica Spheres Prepared from Alkoxysilanes[J].Acta Physico-Chimica Sinica,1995,11(7):646-649. |
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| Authors: | Chen Shengli Dong Peng Yang Guanghua Yang Jiujing |
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| Institution: | National Heavy Oil Research Laboratory,Petroleum University,China 102200 |
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| Abstract: | 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. |
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| Keywords: | Alkoxysilanes Monodisperse silica Microstructure |
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