Efficient Dispersants for TiO2 Nanopowder in Organic Suspensions |
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| Authors: | Ming‐Shu Kuo Shinn‐Jen Chang Ping‐Hsun Hsieh Yuan‐Chang Huang Chia‐Chen Li |
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| Affiliation: | 1. Institute of Materials Science and Engineering, Department of Materials & Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan;2. Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan;3. Evonik Taiwan Ltd., Taipei, Taiwan |
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| Abstract: | This article discusses the appropriate dispersant for titania (TiO2) nanopowder in organic‐based suspensions. Four types of oleyl‐based dispersants, namely, oleyl alcohol, oleic acid, oleylamine, and oleyl phosphate, which have the functional groups hydroxyl (–OH), carboxyl (–COOH), amino (–NH2), and phosphorous [–P(=O)(OH)2], respectively, were compared for their ability to disperse TiO2. Experimental results for zeta potential, adsorption, FT‐IR spectroscopy, and rheology, as well as theoretical calculations, indicate that dispersants with –P(=O)(OH)2 and –NH2 were more efficient than those with –COOH or –OH. The primary reason for this difference is related to the different interactions of TiO2 with various dispersants and to different dispersion mechanisms. In addition to the major functional groups, –OH in the chemical structure of dispersants was important, as it might have other effects such as destabilization of the suspensions. |
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