Drying dissipative patterns of aqueous solutions of simple electrolytes and their binary mixtures on a cover glass |
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Authors: | Tsuneo Okubo Akira Tsuchida Hiroki Togawa |
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Affiliation: | (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 1-1, Gifu 501-1193, Japan |
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Abstract: | The drying dissipative patterns of aqueous solutions of simple electrolytes, KCl, NaCl, CaCl2, and LaCl3, were observed on a cover glass. The macroscopic broad rings were formed at the outside edge of the drying film area, which shrunk from the initial solution area especially at low salt concentrations. The drying area and the broad ring size decreased as the salt concentration decreased. The microscopic block-like and dendritic cross-like patterns were observed for all the salts. Size of single crystals dried on a cover glass increased as salt concentration increased. The drying patterns of the binary mixtures of the salts were also observed. Size of the broad ring increased sharply by mixing. The microscopic patterns were, on the other hand, insensitive to the mixing. |
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Keywords: | Drying dissipative structure Pattern formation Simple electrolytes Broad ring pattern Cover glass |
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