کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9676065 | 1454113 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Comparison of the growth mechanism of TiO2-coated SiO2 particles prepared by sol-gel process and water-in-oil type microemulsion method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
TiO2-coated SiO2 particles were synthesized by sol-gel process and microemulsion method, respectively, in order to compare the growth mechanism of TiO2 particles coated on SiO2 core particles. Firstly, monodispersed SiO2 core particles were prepared and then the SiO2 particles were allowed to coat and grown by further addition of TEOT as a precursor of TiO2 particles. In this work, Nielsen's chronomal analysis and Overbeek's theory were applied to elucidate the growth mechanism of TiO2 particles coated on the surface of SiO2 core particles. As a result, it was found that the growth mechanism of all of the TiO2-coated SiO2 particles obtained by sol-gel process and microemulsion method was presumed to be surface nucleation growth in which the rate-determining step was a first-order polynuclear layer growth mechanism. In the case of particle size distribution, however, sol-gel process was more advantageous than microemulsion method. In addition, the growth rate constant of TiO2-coated SiO2 particles prepared by sol-gel process (2.95Â ÃÂ 10â6Â cm/s) was much faster than that by microemulsion method (6.06Â ÃÂ 10â8Â cm/s). So, sol-gel process was suitable to increase the particle size of TiO2-coated SiO2 particles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 255, Issues 1â3, 21 March 2005, Pages 131-137
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 255, Issues 1â3, 21 March 2005, Pages 131-137
نویسندگان
Ki Do Kim, Hee Taik Kim,