Drying dissipative structures of aqueous solution of poly (ethylene glycol) on a cover glass |
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Authors: | Tsuneo Okubo Tomio Yamada Keisuke Kimura 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: | Macroscopic and microscopic dissipative structural patterns formed in the course of drying a series of poly (ethylene glycol)
(PEG) having molecular weights ranging from 1,000 to 2×106 in aqueous solution have been studied on a cover glass. The broad ring patterns of the hill accumulated with the polymers
are formed irrespective of the molecular weights of PEG molecules. The single round hills are formed also in the center in
the macroscopic scale, when the molecular weight is large. The characteristic convection flow of the polymers and the interactions
among the polymers and substrate are important for the macroscopic pattern formation. Cross-like fractal patterns are observed,
especially for the diluted solutions in the microscopic scale. These patterns are determined mainly by the electrostatic and
polar interactions between the polymers and/or between the polymer and the substrate in the course of solidification. Interestingly,
these microscopic patterns are reflected based on the shape and size of the PEG polymers. |
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Keywords: | Drying dissipative structure Pattern formation Poly (ethylene glycol) Broad ring pattern Fractal pattern |
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