Dissipative structures formed in the course of drying the colloidal crystals of silica spheres on a cover glass
Dissipative structures formed in the course of drying the colloidal crystals of silica spheres on a cover glass
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盖玻片上二氧化硅球胶体晶体干燥过程中形成的耗散结构
DOI：
10.1007/s00396-001-0633-4
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发表时间：
2002
影响因子：
2.4
通讯作者：
H. Kimura
中科院分区：
文献类型：
--
作者：
T. Okubo;Shinya Okuda;H. Kimura
观察了硅球(直径103 nm)在盖板玻璃上干燥过程中形成的宏观和微观耗散结构模式。宏观上形成轮辐状和环状结构，前者是球状薄膜中的裂隙，后者是围绕外缘形成的球体堆积的山丘。讨论了相邻轮辐角、膜厚等形貌参数与球体浓度、氯化钠浓度和盖层玻璃倾角的关系。在微观尺度上观察到了泥浆裂缝的分维形态。气液界面上球体间的毛细作用力以及干燥前沿水流与球体对流之间的相对速率对花纹的形成有重要影响。
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.