Preparation of hollow silica microspheres with controlled shell thickness in supercritical fluids |
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Authors: | Guannan Sun Zhimin Chen Shanshan Wang Linmei Li Jianwei Fu Jiafu Chen Qun Xu |
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Affiliation: | (1) College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, China; |
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Abstract: | This article presents a novel route to prepare hollow silica microspheres with well-defined wall thickness by using cross-linked polystyrene (PS) microspheres as templates with the assistance of supercritical carbon dioxide (SC-CO2). In this approach, the cross-linked PS templates can be firstly prepared via emulsifier-free polymerization method by using ethylene glycol dimethacrylate or divinylbenzene as cross-linkers. Then, the silica shell from the sol–gel process of tetraethyl orthosilicate (TEOS) which was penetrated into the PS template with the assistance of SC-CO2 was obtained. Finally, the hollow silica spheres were generated after calcinations at 600 °C for 4 h. The shell thickness of the hollow silica spheres could be finely tuned not only by adjusting the TEOS/PS ratio, which is the most frequently used method, but also by changing the pressure and aging time of the SC-CO2 treatment. Fourier transform infrared spectroscopy, transmission electron microscopy, and scanning electron microscope were used to characterize these hollow silica spheres. |
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