疑似一次元異方性膜を目指した液晶性超高分子多糖類のミクロン配向制御

建立了在1 mm的有限空间内蒸发液晶多糖溶液制备单轴取向三维膜结构的方法。多糖，黄原胶和sacran，具有高分子量和溶致液晶特性，积累在一个位置，作为一个核的薄膜，随后桥接两个基板和增长的下降的空气-LC界面。进一步研究了LC状态及其形状对多糖桥接沉积的指导作用，并探讨了相关的流变学特性。蓝藻胞外多糖sacran（a）的水溶液，由杆状LC单元组成，通过桥接差距存款形成1 mm宽的膜。相比之下，通过本体萃取获得的另一种sacran的溶液，sacran（B），含有棒状和片状LC单元，可以桥接干燥单元的基板之间的非常厚的间隙。在干燥空气-LC界面处的强相互作用帮助片状单元明确地与棒状单元对齐。这项工作中的物理见解恢复了LC生物聚合物的使用，以制备长程有序结构，而无需使用复杂的设置/仪器。此外，它提供了一个直接的指示作用的结构单元发生在自然界中的一个永久干燥的环境。该作品在冲绳胶体国际会议上获得了最佳海报奖。

The method of fabrication of uniaxially oriented 3-D membranous structures, by evaporating liquid crystalline (LC) polysaccharide solutions from a limited space of 1 mm, had been established. The polysaccharides, xanthan gum and sacran, having high molecular weight and lyotropic LC properties, accumulate at a position, as a nucleus for a thin membrane that subsequently bridges the two substrates and grows with the descending air-LC interface. The role of the LC state and its shape that guides the bridging deposition of the polysaccharide was further examined and the associated rheological characteristics were explored. An aqueous solution of cyanobacterial exopolysaccharide, sacran (a), consisting of rod-shaped LC units deposit to form a 1 mm wide membrane by bridging the gap. In contrast, the solution of another sacran obtained by bulk extraction, sacran (b), containing rod- and platelet-shaped LC units, could bridge an extraordinary thicker gap between the substrates of the drying cell. Strong interactions at the drying air-LC interface help the platelet-shaped units to unequivocally align with the rod-shaped units. The physical insights in this work reinstate the use of LC biopolymers to prepare long-range ordered structures without the use of complicated setup/instruments. Also, it affords a direct indication towards the role of structural units occurring in nature under a perpetually drying environment. This work was recognized and awarded with the Best Poster Award at the Okinawa Colloids International conference.