正硅酸乙酯溶胶-凝胶行为的超声波在线监测研究[EB/OL]
北京：中国科技论文在线
研究了酸催化条件下正硅酸乙酯(TEOS)的溶胶-凝胶行为
提供了一种实时在线的监测研究手段
表明反应中粒径明显的先增大后减小趋势及“水解-缩合-聚合”的连续过程
实时的信号衰减变化是由平稳迅速增大
由此通过考察超声波信号变化可获得粒子形成、粒径变化、反应程度及凝胶生成等信息
溶胶-凝胶
） Abstract： Abstract: The ultrasonic on-line monitoring method was used to investigate the ethyl orthosilicate (TEOS) sol-gel behavior first under the acid catalysis condition, obtaining the signal characteristic curve along with the response change
The infrared spectrometry and the SEM were carried on the analysis to the results
It indicates that, high temperature favors the condensation, the sol-gel process is shorter when H2O/TEOS=8:1 under the same temperature
The real-time signal attenuation increases rapidly, appears the peaks, then gradually reducing tends to achieve a platform, latterly increases to occur jumps
Correspondingly, the colloidal particle size observed during the reaction has a rising and falling period prior to the sharp jumps at the gelation point and it exists the continuous “hydrolysis-condensation-polymerization” process
Through inspecting the ultrasonic signal change, it can obtain the information about the granule growth, particle size change, extent of reaction and gelatin to form
It offers a sort of real-time monitoring research method, providing the important reference for further understanding the silicon dioxide and the compound materials preparation
Keywords： ultrasonic wave;ethyl orthosilicate;sol-gel;monitor;on-line 下载PDF阅读器 PDF全文下载： 初稿 （ 216 ） 作者简介： 通信联系人： 【收录情况】 中国科技论文在线： 董元军
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