Welcome to China Surfactant Detergent & Cosmetics, Today is

China Surfactant Detergent & Cosmetics ›› 2022, Vol. 52 ›› Issue (7): 770-777.doi: 10.3969/j.issn.1001-1803.2022.07.013

• Reviews • Previous Articles     Next Articles

Advances in size control of micro and nano silica particles

Niu Hongbo1,Yan Yongli1,*(),Dou Longlong2,Jiang Xuanxuan1,Zhang Xiao1,Zhang Peiliang1   

  1. 1. College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, Shaanxi 710065, China
    2. No.10 Oil Production Plant, Changqing Oilfield Company, CNPC, Qingcheng, Gansu 745100, China
  • Received:2021-11-02 Revised:2022-05-16 Online:2022-07-22 Published:2022-07-21
  • Contact: Yongli Yan E-mail:yylhill@163.com.

Abstract:

Micro/nano-SiO2 particles are important inorganic non-metallic materials, and their good properties are concerned by researchers. They are also ideal building blocks for assembling functional nanostructured materials, and play an important role in rubber, photonic crystals, biomedicine, cosmetics and other fields. Therefore, the synthesis of nano-silica particles with controllable particle size is of great significance. Since Stöber et al. successfully prepared silica nanoparticles with different size by adjusting appropriate reaction parameters in 1968, a series of important progress has been made in the synthesis of silica nanoparticles. However, how to control the particle size of SiO2 more effectively remains to be further developed. Herein, three preparation methods of SiO2 particles are briefly introduced, including Stöber method, microemulsion method and precipitation method, with emphasis on the particle size control mechanism and its influencing factors in the preparation of SiO2 particles. The particle size control mechanism of SiO2 particles prepared by Stöber method and microemulsion method is mainly based on the reaction kinetics of TEOS hydrolysis and condensation, while the particle size control mechanism of SiO2 particles prepared by precipitation method is mainly based on the theory of silicic acid polymerization. The research progress has shown that by using Stöber method, by adjusting the type and concentration of catalysts, solvent polarity, synthesis process and other factors, the particle size of SiO2 particles can be adjusted in the range of 10 nm-4.5 μm; by microemulsion method, by adjusting the content of reactants, hydrophobic carbon chain length of surfactants and other factors, the particle size of SiO2 particles can be adjusted in the range of 20-100 nm; by means of precipitation method, by adjusting the content of reactants, pH of solution, synthesis process and other factors, SiO2 particles with the smallest particle size of 2 nm can be obtained. Finally, the problems and development direction of micro/nano-SiO2 particle size control technology are pointed out to provide some reference for application.

Key words: silica, size control, Stöber method, microemulsion method, precipitation method

CLC Number: 

  • TB383.1