| 二氧化钛表面包覆氧化硅纳米膜的热力学研究 |
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| 引用本文： | 崔爱莉,王亭杰,金涌,孙牧. 二氧化钛表面包覆氧化硅纳米膜的热力学研究[J]. 高等学校化学学报, 2001, 22(9): 1543-1545 |
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| 作者姓名： | 崔爱莉 王亭杰 金涌 孙牧 |
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| 作者单位： | 1. 清华大学化学系;2. 清华大学化工系, 北京 100084;3. 中国科学院物理研究所表面物理国家重点实验室, 北京 100080 |
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| 基金项目： | 国家自然科学基金 (批准号 :198740 76 )资助 |
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| 摘 要： | 热力学计算结果表明,氧化硅的临界成核半径为2.8nm.由起伏引起的核胚如果小于2.8nm则不会形成晶核而继续生长.上述热力学分析虽然是半理想化的,但是非常有效.可以找到这样一个体系,其溶液条件不发生均匀成核,而是异相表面成核.这在理论上为氧化硅包覆在二氧化钛表面形成均匀膜而不生成单独的氧化硅相提供了可能.
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| 关 键 词： | 二氧化钛 氧化硅 热力学 包覆 |
| 文章编号： | 0251-0790(2001)09-1543-03 |
| 收稿时间： | 2000-08-02 |
Thermodynamic Research on the Coating Process of Silica Nano Film on Titanate Particles Surface |
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| CUI Ai Li ,WANG Ting Jie ,JIN Yong ,SUN Mu. Thermodynamic Research on the Coating Process of Silica Nano Film on Titanate Particles Surface[J]. Chemical Research In Chinese Universities, 2001, 22(9): 1543-1545 |
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| Authors: | CUI Ai Li WANG Ting Jie JIN Yong SUN Mu |
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| Affiliation: | 1. Department of Chemistry, Tsinghua University, Beijing 100084, China;2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;3. State Key Laboratory for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | The critical nucleation radius is 2.8 nm obtained from calculation with thermodynamic method. If the nucleus caused by fluctuation is less than 2.8 nm, the nucleus will not grow up. Though the thermodynamic analysis is semi ideal, it is effective. We find a solution system in which the nucleation does not take place uniformly, but does on the surfaces of different solid phases. It gives a feasibility theoretically for titanate being coated uniformly with silica nanofilm and a single phase of silica not being formed. |
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| Keywords: | Titanium dioxide Silicon dioxide Thermodynamics Coating |
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