Preparation and Characterization of Monodisperse Mesoporous Silicon Dioxide Microspheres with Large Particle Size

Abstract

Abstract: Using tetraethyl orthosilicate (TEOS) as silicon source and N,N-dimethylformamide (DMF) as emulsified porogen, partially condensed poly(ethoxy)siloxane (PES) was obtained by acid-catalyzed method. PES was further catalyzed by alkali to obtain mesoporous silicon dioxide microspheres. The effects of the amount of acid catalyst, spin temperature on the viscosity and degree of polymerisation of PES and the effect of PES viscosity on the particle size of silicon dioxide microspheres were investigated. The effects of the amount of ammonia water, the type of emulsified porogen, the amount of emulsified porogen, the stirring speed and the post-treatment method on the properties of silicon dioxide microspheres were also studied. The microspheres were characterized by scanning electron microscopy, rotational viscometer, nitrogen blow adsorption and Fourier infrared spectroscopy. The results show that the prepared mesoporous silicon dioxide microspheres are spherically intact, with uniform particle size distribution and high purity. The average pore size of microspheres is 10.164 4 nm, the pore volume is 1.023 023 cm³/g and the specific surface area is 396.528 1 m²/g.

Key words: silicon dioxide microsphere, large particle size, mesoporous, sol-gel method, viscosity, nano microstructure

CLC Number:

TB34

GUAN Tong, JIN Zhao, SHAO Huafeng, SUN Jinrui. Preparation and Characterization of Monodisperse Mesoporous Silicon Dioxide Microspheres with Large Particle Size[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3288-3295.

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