Formation of silica nanoparticles by hydrolysis of TEOS using a mixed semi-batch/batch method
Formation of silica nanoparticles by hydrolysis of TEOS using a mixed semi-batch/batch method
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DOI：
10.1023/a:1020217105290
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发表时间：
2002-12-01
影响因子：
2.5
通讯作者：
Kim, HT
中科院分区：
文献类型：
--
作者：
Kim, KD;Kim, HT
提出了一种制备纳米二氧化硅的新方法，该方法由四乙基硅酸盐（TEOS）半批/批两段水解反应组成。在半批量过程中，TEOS的水解速率相对较慢，导致二氧化硅颗粒较大，粒径分布较窄。这与批处理过程形成了直接对比。给出了在初始半批反应和随后的批反应中减小粒径的一个例子。在完成最初的半批量步骤后，二氧化硅颗粒的直径为106 nm。随着后续批次反应的进行，颗粒的平均尺寸减小到23 nm。本研究发现，采用该混合方法制备二氧化硅纳米颗粒的最佳条件为：（TEOS: 0.5 M, H2O: 6.0 M, NH4OH: 0.2 M，进料速度：5.0 ml/min，温度：42.5℃）。总之，半批/批混合体系为纳米颗粒的合成提供了新的可能性。
A new method for preparing silica nanoparticles, which consists of a two-stage semi-batch/batch hydrolysis reaction of tetraethylorthosilicate (TEOS), is presented. A relatively slow rate of hydrolysis of the TEOS occurred during the semi-batch process, which resulted in larger silica particles with a narrower size distribution. This was in direct contrast to the batch process. An example of reduction in particle size for an initial semi-batch and subsequent batch reaction is shown. On completion of the initial semi-batch step, the silica particles had a diameter of 106 nm. As the subsequent batch reaction proceeded, the mean size of the particles decreased to 23 nm. In this work, it was found that the optimal conditions for the silica nanoparticles using this mixed method were as follows; (TEOS: 0.5 M, H2O: 6.0 M, NH4OH: 0.2 M, feed rate: 5.0 ml/min, temperature: 42.5degreesC). In conclusion, a mixed semi-batch/batch system suggested a new probability for the synthesis of nanoparticles.