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Preparation of Monodisperse and Spherical Powders by Heating of Alcohol-Aqueous Salt Solutions

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Abstract

A method for the preparation of monodisperse and spherical powders from salt solution with a mixed solvent of alcohol and water is demonstrated. The volume ratio of alcohol to water (R/H ratio) in the alcohol-aqueous salt solutions greatly influenced the behavior of the precipitation and the morphology of the resulting particles. The precipitation, by heating an alcohol-aqueous salt solution, occurs by the decrease of dielectric constant of the solvent and thus a decrease in the salt solubility. The morphology and size variation of the resulting particles was explained by considering the parameters determining the colloidal stability in the DLVO theory; the zeta potential and the dielectric constant. During the preparation of the powders by heating of the alcohol-aqueous salt solution, the effect of heating methods on the characteristics of the resulting particles is also demonstrated. A microwave heating, as a uniform and rapid heating method, induced the uniform and rapid precipitation to produce monodisperse and spherical particles.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Taejeon, 305-701, Korea

    Jae Young Choi & Do Kyung Kim

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  1. Jae Young Choi
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  2. Do Kyung Kim
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Choi, J.Y., Kim, D.K. Preparation of Monodisperse and Spherical Powders by Heating of Alcohol-Aqueous Salt Solutions. Journal of Sol-Gel Science and Technology 15, 231–241 (1999). https://doi.org/10.1023/A:1008737008988

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