Deposition and characterization of binary Al₂O₃/SiO₂ coating layers on the surfaces of rutile TiO₂ and the pigmentary properties

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• 作者：Yunsheng Zhang ; Hengbo Yin ; Aili Wang ; Min Ren ; Zhuomin Gu ; Yumin Liu ; Yutang Shen ; Longbao Yu ; Tingshun Jiang
• 关键词：Rutile TiO₂ ; SiO₂ coating layer ; Al₂O₃ coating layer ; Coating
• 刊名：Applied Surface Science
• 出版年：2010
• 出版时间：1 December 2010
• 年：2010
• 卷：257
• 期：4
• 页码：1351-1360
• 全文大小：1365 K

文摘

Binary Al₂O₃/SiO₂-coated rutile TiO₂ composites were prepared by a liquid-phase deposition method starting from Na₂SiO₃·9H₂O and NaAlO₂. The chemical structure and morphology of binary Al₂O₃/SiO₂ coating layers were investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, TG–DSC, Zeta potential, powder X-ray diffraction, and transmission electron microscopy techniques. Binary Al₂O₃/SiO₂ coating layers both in amorphous phase were formed at TiO₂ surfaces. The silica coating layers were anchored at TiO₂ surfaces via Si–O–Ti bonds and the alumina coating layers were probably anchored at the SiO₂-coated TiO₂ surfaces via Al–O–Si bonds. The formation of continuous and dense binary Al₂O₃/SiO₂ coating layers depended on the pH value of reaction solution and the alumina loading. The binary Al₂O₃/SiO₂-coated TiO₂ composites had a high dispersibility in water. The whiteness and brightness of the binary Al₂O₃/SiO₂-coated TiO₂ composites were higher than those of the naked rutile TiO₂ and the SiO₂-coated TiO₂ samples. The relative light scattering index was found to depend on the composition of coating layers.