Drying dissipative patterns of dyes in ethyl alcohol on a cover glass |
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Authors: | Tsuneo Okubo Naomi Yokota 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, Yanagido 501-1193, Japan |
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Abstract: | Drying dissipative structural patterns formed in the course of drying ethyl alcohol solutions of rhodamine 6G, uranine, 7-hydroxy
coumarin, and 7-amino-4-(trifluoro methyl)-coumarin are studied on a cover glass. The macroscopic broad ring patterns form
for all the solutions examined, which supported importance of the convectional flow of ethyl alcohol and dye solutes. Dried
area increases as dye concentration increases above the critical dye concentration. Microscopic fine patterns including street-like,
needle-like, and flower-like crystal structures are formed in the solidification processes. Change in the functional side
group moieties of the dyes gives the strong effect on the microscopic drying patterns; even the main chemical structures are
same. Kinetic aspect of the drying patterns is studied. |
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Keywords: | Drying dissipative structure Pattern formation Dye Broad ring pattern Street-like pattern Flower-like pattern |
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