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单分散球形SiO2形成过程的电导率和粘度变化
Variation of Conductivity and Viscosity of the Formation of Monodispersed Spherical Silica
查看参考文献9篇
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文摘
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在醇氨反应体系中，根据溶液在不同反应时刻电导率和粘度的变化，结合微观形貌观察，研究单分散球形SiO2的形成过程。研究表明单分散球形SiO2的形成经历3个阶段：晶核形成期，反应初期正硅酸乙酯在氨催化下快速水解，形成大量晶核，电导率和粘度迅速增加；晶核生长期，形成的晶核经聚集不断长大发育，电导率逐渐下降，粘度不断增加；颗粒稳定期，颗粒长大后，溶液电导率和粘度不再变化，而颗粒形态不够完整，经过一定时间的稳定发育后，最终形成结构密实的单分散球形SiO2。研究还表明，快速并分离形核和以后的长大过程是形成良好单分散颗粒的关键。 |
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其他语种文摘
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Monodispersed spherical silica was produced in ethanol-ammonia reaction system.Based on the examination of conductivity,viscosity,TEM of reaction system in different stages,it was found that the formation of monodispersed spherical silica experienced three stages.The first was the micro-nuclei formation stage,when tetraalkoxysilane hydrolyzed rapidly in alcoholic-water solutions catalyzed by ammonium hydroxide,a plenty of nuclei was formed,and at the same time the conductivity and viscosity went up rapidly.The second was nuclei growth,when small nuclei condensed and grew continuously,meanwhile the conductivity was decreased gradually and the viscosity was still increased.The last was steady particale when particles reached their full size,and turned more stable and dense.Both the conductivity and viscosity did not varied any more.It shows that the key of producing uniform particles is fast formation and separation of nuclei and growth processes. |
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来源
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硅酸盐通报
,2003,22(1):88-91 【核心库】
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关键词
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单分散
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球形SiO2
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电导率
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粘度
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二氧化硅
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形成过程
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地址
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1.
东北大学理学院, 沈阳, 110004
2.
中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-1625 |
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学科
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化学工业 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:1293380
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9
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