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Large single crystals of colloidal silica spheres appearing in deionized and diluted suspension

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Abstract

Close-up color photographs are taken for crystallites (single crystals surrounded by the grain boundaries) in the colloidal crystals of monodisperse silica spheres (diameter: 110 nm±4.5 nm (standard deviation)). Very large crystallites (3∼4 mm) are observed with the naked eye (for the first time) for the completely deionized and diluted suspensions. Deionization is carefully made with the mixed beds of ion-exchange resins more than 2 weeks old. Size of the crystallites increases sharply as the concentration of spheres decreases, and becomes small at the concentrations slightly higher than the critical concentration of melting toward liquid-like structure. Shape of the crystallites, i.e., mixture of triangle, cubic, pentagonal, hexagonal, cone-like, etc., is recognized in the photographs.

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  1. T. Okubo

    Present address: Department of Polymer Chemistry Faculty of Engineering, Kyoto University, Sakyo-ku, 606-01, Kyoto, Japan

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    Okubo, T. Large single crystals of colloidal silica spheres appearing in deionized and diluted suspension. Colloid Polym Sci 271, 190–196 (1993). https://doi.org/10.1007/BF00651821

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    • DOI: https://doi.org/10.1007/BF00651821

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