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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Acknowledgments
Financial supports from the Ministry of Education, Culture, Sports, Science and Technology, Japan and Japan Society for the Promotion of Science are greatly acknowledged for Grants-in-Aid for Exploratory Research (17655046 to T.O.), Scientific Research on Priority Area (A) (11167241 to T.O.), and Scientific Research (B) (11450367 and 18350057 to T.O. and 19350110 to A.T.), respectively. Catalysts and Chemicals Co. is thanked deeply for his providing the colloidal silica sphere samples used in this work.
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Okubo, T., Tsuchida, A. & Togawa, H. Drying dissipative patterns of aqueous solutions of simple electrolytes and their binary mixtures on a cover glass. Colloid Polym Sci 287, 443–454 (2009). https://doi.org/10.1007/s00396-008-1987-7
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DOI: https://doi.org/10.1007/s00396-008-1987-7