| SiO2溶胶-凝胶转变过程的动力学研究及应用 |
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| 引用本文： | 高朋召,王红洁,金志浩. SiO2溶胶-凝胶转变过程的动力学研究及应用[J]. 复合材料学报, 2003, 20(4): 122-127 |
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| 作者姓名： | 高朋召 王红洁 金志浩 |
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| 作者单位： | 西安交通大学,材料强度国家重点实验室,西安,710049 |
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| 摘 要： | 以硅酸乙酯为前驱体,通过水解法制备SiO2溶胶,系统研究了SiO2胶体的溶胶-凝胶转变过程。讨论了不同参数(如pH值、温度、硅酸乙酯的浓度等)对溶胶体系胶凝时间的影响,并对该过程的活化能进行了计算。结果表明:在酸性条件下,溶胶分子的生长模式为线性;随pH值增加,体系胶凝时间先增加后减少,拐点在pH等于2处;活化能与体系的pH有关。同时对上述结果从化学键、电荷密度、反应机理等方面进行了合理的解释。
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| 关 键 词： | 溶胶-凝胶转变过程 生长模式 活化能 反应机理 SiO2涂层 |
| 文章编号： | 1000-3851(2003)04-0122-06 |
| 收稿时间： | 2002-02-07 |
| 修稿时间： | 2002-02-07 |
KINETIC STUDY ON SOL-GEL TRANSITION AND APPLICATION OF SiO2 SOL |
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| GAO Pengzhao,WANG Hongjie,JIN Zhihao. KINETIC STUDY ON SOL-GEL TRANSITION AND APPLICATION OF SiO2 SOL[J]. Acta Materiae Compositae Sinica, 2003, 20(4): 122-127 |
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| Authors: | GAO Pengzhao WANG Hongjie JIN Zhihao |
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| Affiliation: | State Key Laboratory of Mechanical Behavior of Material,Xi'an Jiaotong University,Xi'an 710049,China |
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| Abstract: | Kinetics and influencing factors (such as pH value, TEOS concentration and tempe rature) of sol-gel transition of SiO 2 sol prepared through the hydrolytic met hod were studied. The activated energy of the transition was calculated also. Th e results showed that the molecule growth mode of sol is linear in acid conditio ns. A gradual increase in coagulation time of sol is observed for pH value lower than 2. Further increase of PH value slightly decreases the coagulation time. R eaction activated energy is related to pH value of systems also. The results wer e explained by chemical bond, charge density and reaction mechanism. |
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| Keywords: | sol-gel transition growth mode activation energy reaction mechanism SiO 2 coating |
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