Dissipative structures formed in the course of drying an aqueous solution of poly(allylamine hydrochloride) on a cover glass
Dissipative structures formed in the course of drying an aqueous solution of poly(allylamine hydrochloride) on a cover glass
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DOI：
10.1007/s00396-003-0899-9
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发表时间：
2004
影响因子：
2.4
通讯作者：
T. Okubo;S. Kanayama;Hiroyuki Ogawa;M. Hibino;Keisuke Kimura
中科院分区：
文献类型：
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作者：
T. Okubo;S. Kanayama;Hiroyuki Ogawa;M. Hibino;Keisuke Kimura
观察了阳离子聚电解质、聚烯丙基胺盐酸盐去离子水溶液在盖板上干燥过程中所形成的宏观和微观耗散结构模式。干燥时间从45°C下的40分钟到5°C下的450分钟不等，对聚合物浓度不敏感。在聚合物浓度较低时，图案面积向中心缩小，并随着聚合物浓度的增加而增大。在许多情况下，形成了聚合物密集聚集的宏观宽环图案。在微观尺度上观察到了美丽的分形图。聚合物浓度从10~(-6)×10~(-2)×10~(-2)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10~(-6)×10干燥前沿的水流和伴随聚合物运动的水的对流之间的相对速率对于宏观和微观花纹的形成是重要的。
Macroscopic and microscopic dissipative structural patterns formed in the course of drying a deionized aqueous solution of cationic polyelectrolyte, poly(allylamine hydrochloride) on a cover glass have been observed. Drying times range from 40 min at 45 °C to 450 min at 5 °C, and are insensitive to the polymer concentration. Pattern area shrinks toward the center at the low polymer concentrations, and increases as the concentration increases. A macroscopic broad ring pattern, where the polymer accumulates densely, forms in many cases. Beautiful fractal patterns are observed at the microscopic scale. The fractal dimension increases from 1.2 to 1.6 as polymer concentration increases from 10-6monoM to 10-2monoM. The relative rates between the water flow at the drying front and the convection flow of water accompanying the movement of polymer are important for the macroscopic and microscopic pattern formation.