Selectivity of Hydrophilic and Hydrophobic TiO₂ for Organic-Based Dispersants

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• 作者：Ting-Yi Yang ; Shinn-Jen Chang ; Chia-Chen Li and Pei-Hsuan Huang
• 刊名：Journal of the American Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：100
• 期：1
• 页码：56-64
• 全文大小：961K
• ISSN：1551-2916

文摘

The effects of the surface chemistry of TiO₂ powders on the dispersion performance of various dispersants are studied. Four common dispersants (oleic acid, oleylamine, oleyl phosphate, and tris-(2-butoxyethyl) phosphate) with different functional groups (carboxyl (–COOH), amino (–NH₂), phosphate (–P(=O)(OH)₂), and –P(=O)) are investigated for their potential to disperse hydrophilic and hydrophobic titania (TiO₂) powders. The outcomes, based on adsorption kinetics, adsorption isotherms, rheologies, and theoretical calculations, indicate that the hydrophilic TiO₂ is more sensitive to the chemistry of dispersants as compared to the hydrophobic TiO₂. However, the relative dispersion efficiencies of the dispersants are not found relevant to the adsorption kinetics, which is dominated by the adsorption amount. In addition, hydrogen bonding between –OH groups of the phosphate-based dispersants dominates their dispersion ability for TiO₂.