Effects of coating parameters on the morphology of SiO₂-coated TiO₂ and the pigmentary properties

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• 作者：Yumin Liu ; Chen Ge ; Min Ren ; Hengbo Yin ; Aili Wang ; Dongzhi Zhang ; Chunyan Liu ; Jun Chen ; Hui Feng ; Hengping Yao ; Tingshun Jiang
• 关键词：Rutile TiO₂ ; SiO₂ ; Island-like coating ; Uniform coating ; Pigmentary property
• 刊名：Applied Surface Science
• 出版年：2008
• 出版时间：28 February 2008
• 年：2008
• 卷：254
• 期：9
• 页码：2809-2819
• 全文大小：1985 K

文摘

SiO₂-coated TiO₂ powders were prepared by the chemical deposition method starting from rutile TiO₂ and Na₂SiO₃. The SiO₂-coated TiO₂ powders were characterized by X-ray photoelectron spectroscopy, Zeta-potential analysis, Fourier transform infrared spectroscopy, and transmission electron microscopy. The evolution of island-like and uniform coating layers was found to depend upon the ratio of Na₂SiO₃ to TiO₂, reaction temperature, and pH. The whiteness and brightness of the SiO₂-coated TiO₂ powders increased in response to an increase in the SiO₂ loading, but there was a maximum value among the light scattering indexes. The SiO₂-coated TiO₂ powders possessed more negative Zeta potentials than the naked TiO₂. The dispersibility of the SiO₂-coated TiO₂ powders with the continuous and uniform SiO₂ coating layers was higher than that of the naked TiO₂ and the SiO₂-coated TiO₂ powders with the island-like SiO₂ coating layers.