Fabrication of Porous Silica Microspheres Under the Assistance of Solid Template |
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Authors: | MAO Zheng-wei HU Ling ZHAO Qing-he GAO Chang-you |
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Institution: | Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China |
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Abstract: | Spherical porous silica microparticles were synthesized by a sol-gel process in the presence of porous CaCO3 particles, followed by removal of the carbonate templates. The resulting silica particles had very high porosity and wide pore size distribution, whose surface area and pore volume reached up to 367.3 m2/g and 0.72 mL/g, respectively. With a larger amount of the tetraethyl orthosilicate used, hollow silica microspheres were further obtained. Characterization was made to confirm the chemical and physical structures and purity of the silica microspheres. Spontaneous deposition of tetramethyl rhodamine isothiocyanate labeled dextran into the microspheres was also observed due to the charge attraction. |
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Keywords: | Porosity Deposition Sol-gel preparation Silicone dioxide Microsphere |
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