Effect of Evaporation Rate on Meniscus Splitting with Formation of Vertical Polysaccharide Membranes
Effect of Evaporation Rate on Meniscus Splitting with Formation of Vertical Polysaccharide Membranes
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DOI：
10.1002/admi.201900855
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发表时间：
2019-07-30
影响因子：
5.4
通讯作者：
Kaneko, Tatsuo
中科院分区：
文献类型：
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作者：
Okeyoshi, Kosuke;Yamashita, Miki;Kaneko, Tatsuo
聚合物胶体的蒸发自组装是制备具有亚微米级有序结构的软材料最具吸引力的策略之一。本研究在有限空间内控制蒸发速率的条件下，验证了液晶（LC）多糖黄原胶水溶液的半月板分裂。在快速蒸发速率下，在空气- lc界面上方湿度梯度较大的条件下，诱导半月板分裂弥合间隙，得到单轴取向的垂直膜。该过程经过了热力学和极化学验证，重点关注有序聚合物吸附和毫米级间隙的桥接。这种澄清不仅可以作为一种固定流体有序结构的方法，而且可以控制蒸发界面，使聚合物溶液有序地形成具有单轴取向的高级膜。
Evaporative self-assembly of polymeric colloids is among the most attractive strategies for the preparation of soft materials with submicrometer-scale ordered structures. In this study, meniscus splitting from an aqueous solution of liquid crystalline (LC) polysaccharide xanthan gum is verified under conditions of controlled evaporative rate in a limited space. Under fast evaporation rate with a steep gradient of humidity above the air-LC interface, the meniscus splitting is induced to bridge the gap and a vertical membrane with uniaxial orientation is obtained. The process is thermodynamically and polariscopically validated focusing on the ordered polymeric adsorption and the bridging of the millimeter-scale gap. This clarification will serve not only as a method for immobilization of fluidically ordered structures but also in the control of the evaporative interface for the ordering of polymer solutions into advanced membranes with uniaxial orientation.