Preparation of SiO2 Microspheres by Two-step Catalytic Sol-Gel Method

doi:10.3724/SP.J.1077.2011.01090

Abstract

Abstract: Micrometer SiO₂ microspheres were prepared by two-step catalytic Sol-Gel method with tetraethoxysilane (TEOS) as starting material and N,N-Dimethylformamide (DMF) as template. The effects of some factors on the diameter and particle size distribution of the SiO₂ microspheres were discussed, such as H₂O quantity and ethanol quantity during the first catalytic process, the electrolyte concentration and stirring speed during the secondary catalytic process. SiO₂microspheres were characterized by SEM, Zetasizer, BET measurements and microscope-particle image analysis system. Results show that SiO2 microspheres are mostly regular-ball with no particle agglomeration. The mean particle size (D50) is 8.9μm, and the particle size distribution follows typical Gaussian distribution. The specific surface area is 546.67m²/g, and pore volume is 0.7142m³/g, with a narrow pore size varied from 2nm to 8nm. Also the particle size increases with water quantity, ethanol quantity and NaCl concentration increaing, but decreases with stirring speed acceleration.

Key words: SiO₂microspheres, two-step catalysis, Sol-Gel method

CLC Number:

TQ127

ZHAO Bei-Bei, XU Chan-Chan, TANG Tao, LI Tong, ZHANG Wei-Bing, WANG Feng-Yun. Preparation of SiO₂ Microspheres by Two-step Catalytic Sol-Gel Method[J]. Journal of Inorganic Materials, 2011, 26(10): 1090-1094.

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Preparation of SiO₂ Microspheres by Two-step Catalytic Sol-Gel Method

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