Sedimentation and drying dissipative patterns of colloidal silica (305 nm in diameter) suspensions in a glass dish and a watch glass |
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Authors: | Tsuneo Okubo Junichi Okamoto Akira Tsuchida |
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Institution: | (1) Institute for Colloidal Organization, Hatoyama 3-1-112, Uji, Kyoto 611-0012, Japan;(2) Cooperative Research Center, Yamagata University, Johnan 4-3-16, Yonezawa 992-8510, Japan;(3) Department of Applied Chemistry, Gifu University, Gifu 501-1193, Japan |
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Abstract: | Sedimentation and drying dissipative structural patterns formed in the course of drying colloidal silica spheres (305 nm in
diameter) in aqueous suspension have been studied in a glass dish and a watch glass. The broad ring sedimentation patterns
formed within several tenth minutes in suspension state by the convectional flow of water and colloidal spheres. The sedimentary
spheres always moved by the convectional flow of water, and the broad ring patterns became sharp with time. The width of the
broad rings was sensitive to the change in the room temperature and/or humidity. In other words, the patterns became sharp
or vague when the room parameters decreased or increased. Colorful macroscopic drying structures were composed of a broad
ring and the wave-formed patterns. Iridescent colored fine patterns formed in the solidification processes on the bases of
the sedimentation patterns. Beautiful drying patterns were observed for the suspension mixtures of CS300 and NaCl, and were
different from the structures of CS300 or NaCl individuals, which support the synchronous cooperative interactions between
the colloidal spheres and the salt. |
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Keywords: | Sedimentation dissipative structure Drying dissipative structure Colloidal silica spheres Broad ring pattern Wave-like pattern |
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