Colloidal crystals of cationic spheres |
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Authors: | Tsuneo Okubo Hiroshi Kimura Hiromi Hase Keizo Yamaguchi Tatsuo Taniguchi Katsutoshi Nagai |
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Institution: | (1) Department of Applied Chemistry, Gifu University, 501-1193 Gifu , Japan;(2) Department of Polymer Science and Engineering, Yamagata University, 992-8510 Yonezawa, Japan |
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Abstract: | Colloidal single crystals of cationic polymer spheres (198–250 nm in diameter) in deionized aqueous dispersions were formed for the first time. The spheres used were poly(styrene-co-methacryloyloxyphenyldimethylsulfonium) cations. These cations are unstable in deionized suspensions with mixed beds of cation-exchange and anion-exchange resins. This was clarified by reflection spectroscopy, pH, conductance and -potential measurements for 250 days after suspension preparation. Colloidal crystals formed over a period of 24 h for the deionized suspensions at sphere concentrations higher than 0.09 in volume fraction. The nearest-neighbor intersphere distances coincide satisfactorily with the calculated values using the diameter and the concentration of the spheres. Alloy crystals formed from binary mixtures of the cationic polymer spheres and the anionic silica spheres when the ratio of the volume fraction of cationic spheres against the sum of the both cationic and anionic spheres was smaller than 0.3. |
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Keywords: | Colloidal crystal Cationic polymer colloids Colloidal alloy of unlikely charged spheres Reflection spectroscopy |
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