A Comparison of the Formation of SiO2 Particles Under the Catalysis of Dodecylamine and Ammonia Solutions
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SiO2 products were prepared by the hydrolysis and condensation of tetraethyl orthosilicate with ammonia and dodecylamine (DDA) solutions as the basic catalyst, respectively. Thermal gravimetric analysis, scanning electron microscope and N2-sorption were used to characterize the synthesized products. The results show that the morphology and textural characteristics of the products prepared in inorganic ammonia and organic amine solutions with the same pH value are quite different. Uniform non-porous silica microspheres and agglomerated sphere-like microporous silica particles with large surface area and pore volume are obtained with the addition of ammonia and DDA solutions, respectively. The differences are due to the different roles that ammonia and DDA solutions play in the silica formation process.
KeywordsSilica Ammonia Dodecylamine Catalyst Porosity
This study was financially supported by the National Natural Science Foundation of China (50972052) and the Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province (2009CL014).
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