Dispersion of Nano-Sized γ-Alumina Powder in Non-Polar Solvents |
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| Authors: | Jen-Chieh Liu Jau-Ho Jean Chia-Chen Li |
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| Affiliation: | Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan; Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan |
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| Abstract: | To disperse nano-sized γ-alumina powders in non-polar solvents, the surface of γ-alumina has to be modified with unsaturated oleic acid, which forms aluminum-oleate on the surface. This changes the surface characteristics of γ-alumina powders from hydrophilic to hydrophobic in nature. A colloidally stable γ-alumina non-polar suspension is obtained when a critical amount of aluminum-oleate compound is formed on the surface. This is also evidenced by the results of adsorption and theoretical calculation of potential energies, which confirm the colloidal stability of organic γ-alumina suspension caused by the steric repulsion mechanism. |
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