J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (8): 711-714.

• Novel Processing and Characterization Methods • 上一篇    下一篇

Preparation of mono-disperse spherical SiO2 by microwave hydrothermal method and kinetics of dehydrating hydroxyl

申晓毅1,zhai yuchun2,顾惠敏3,sun yang4   

  1. 1. 沈阳市东北大学
    2. Northeastern University in china
    3. 东北大学材料与冶金学院
    4. 辽宁省教育厅
  • 收稿日期:2009-05-11 修回日期:2009-06-11 出版日期:2010-08-28 发布日期:2010-08-23
  • 通讯作者: 顾惠敏
  • 基金资助:

    国家重点基础研究发展计划资助项目

Preparation of Monodisperse Spherical SiO2 by Microwave Hydrothermal Method and Kinetics of Dehydrated Hydroxyl

Xiaoyi Shen1), Yuchun Zhai1), Yang Sun1,2), Huimin Gu1)   

  1. 1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
    2) Educational Department of Liaoning Province, Shenyang 110032, China
  • Received:2009-05-11 Revised:2009-06-11 Online:2010-08-28 Published:2010-08-23
  • Contact: Yuchun Zhai
  • Supported by:

    the National Basic Research Program of China (Grant No. 2007CB613603)

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摘要：

Mono-disperse spherical SiO2 particles were successfully synthesized in 2-propanol-H2O-NH3 system by the microwave hydrothermal method using ammonia as catalyst. To investigate the influences on the size of spherical SiO2 particles of the factors, which were ammonia concentration, reaction temperature, stirring intensity and reactants mol ratio. The orthogonal experiments were carried out. The as-prepared SiO2 particles prepared in appropriate conditions were characterized by XRD, TEM, FT-IR and DTA. The results indicated that the size of SiO2 particles increased greatly with the increase of ammonia concentration, temperature and reactants mol ratio, but it increased slightly with the increase in stirring intensity. Mono-disperse spherical SiO2 particles were amorphous with perfect sphere and uniform size. Hydroxyl was detected in SiO2. Kinetic parameters were calculated, and finally the reaction rate equation of dehydrating hydroxyl was obtained.

关键词: Mono-disperse spherical SiO2 particle, Microwave hydrothermal method, Amorphous, Reaction rate equation

Abstract:

Monodisperse spherical SiO2 particles were successfully synthesized in 2-propanol-H2O-NH3 system by the microwave hydrothermal method using ammonia as catalyst. To investigate the influences on the size of spherical SiO2 particles, factors such as ammonia concentration, reaction temperature, stirring intensity and reactants mol ratio have been studied. The orthogonal experiments were carried out. The as-prepared SiO2 particles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and differential thermal analysis (DTA). The results indicated that the size of SiO2 particles increased greatly with the increase in ammonia concentration, temperature and reactants mol ratio, but increased slightly with the increase in stirring intensity. Monodisperse spherical SiO2 particles were amorphous with perfect sphere and uniform size. Hydroxyl was detected in SiO2. Kinetic parameters were calculated, and finally the reaction rate equation of dehydrated hydroxyl was obtained.

Key words: Monodisperse spherical SiO2 particle, Microwave hydrothermal method, Amorphous, Reaction rate