Synthesis of disperse amorphous SiO₂ nanoparticles via sol-gel process

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• 作者：Qian Guo ; Danchun Huang ; Xinli Kou ; Wenbin Cao ; Lu Li ; Lin Ge ; Jiangong Li ; ^{lijg@lzu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A. Sol-gel processes ; A. Calcination ; D. SiO2 ; Nanoparticles
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：192-196
• 全文大小：859 K

文摘

Disperse amorphous SiO₂ nanoparticles are essential to the preparation of SiO₂ nanoglass. In our present work, disperse fine amorphous SiO₂ nanoparticles with a narrow size distribution were synthesized by a sol-gel method and subsequent calcination. In the synthesis, polyethylene glycol 1000 (PEG 1000) was used as surfactant, tetraethyl orthosilicate (TEOS) as silicon source, and ammonia as catalyst. The size and morphology of amorphous SiO₂ nanoparticles were tuned by adjusting the amount of PEG 1000. At 0.1 g PEG 1000, large SiO₂ nanoparticles with an average size of 35 nm most of which are agglomerated and catenulate in shape were produced. At 0.05 and 0.0125 g, SiO₂ nanoparticles with an average size of 18 nm which are nearly disperse with weak agglomeration and irregular in shape were obtained. Under the optimum condition of 0.025 g PEG 1000 and after calcination at 800 °C for 10 h, SiO₂ nanoparticles prepared are completely disperse without any agglomeration, fine, and equiaxed in shape and have an average size of 9 nm and a size distribution of 4–18 nm.