Dissipative structures formed in the course of drying the colloidal crystals of silica spheres on a cover glass |
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Authors: | Tsuneo Okubo Shinya Okuda Hiroshi Kimura |
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Institution: | (1) Department of Applied Chemistry and Graduate School of Materials Science, Gifu University, Gifu 501–1193, Japan, |
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Abstract: | Macroscopic and microscopic dissipative structural patterns formed in the course of drying the deionized aqueous colloidal
crystal suspensions of silica spheres (diameter: 103 nm) on a cover glass have been observed. Spoke-like and ring-like patterns
are formed in the macroscopic scale; the former is the crack in the sphere film and the latter is the hill accumulated with
spheres formed around the outside edge. The neighbored inter-spoke angle, thickness of the film, and other morphological parameters
have been discussed as a function of sphere concentration, concentration of sodium chloride, and the inclined angle of the
cover glass. Fractal patterns of the mud cracks are observed in the microscopic scale. Capillary forces between spheres at
the air-liquid surface and the relative rates between the water flow at the drying front and the convection flow of spheres
are important for the pattern formation.
Electronic Publication |
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Keywords: | Dissipative structure Pattern formation Drying colloidal crystal suspensions Colloidal silica spheres Fractal pattern |
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