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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

针对伪一维各向异性薄膜的液晶超高分子量多糖微米取向控制

基本信息

批准号：
18J11881
负责人：
JOSHI Gargi
金额：
$ 0.96万
依托单位：
Japan Advanced Institute of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2018
资助国家：
日本
起止时间：
2018-04-25 至 2020-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18J11881/
关键词：
self-assembly polysaccharides liquid crystals evaporative interface orientation Self-assembly hydrogels

项目摘要

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.

通过在1 mm的有限空间内蒸发液晶（LC）多糖溶液，建立了制备单轴定向三维膜结构的方法。具有高分子量和溶性LC特性的多糖，黄原胶和沙胶在一个位置积聚，作为薄膜的核，随后连接两个底物并随着空气-LC界面的下降而生长。进一步研究了LC态及其形状在多糖桥接沉积中的作用，并探讨了相关的流变特性。蓝藻胞外多糖sacran (a)的水溶液，由杆状LC单元组成，通过桥接间隙沉积形成1毫米宽的膜。相比之下，通过大量提取获得的另一种sacran溶液，sacran (b)，含有棒状和血小板状的LC单元，可以在干燥细胞的底物之间建立一个非常厚的间隙。干燥空气- lc界面处的强相互作用有助于血小板状单元与棒状单元明确对齐。本工作中的物理见解恢复了LC生物聚合物在不使用复杂设置/仪器的情况下制备远程有序结构的使用。此外，它还提供了结构单元在永久干燥环境下在自然界中所起作用的直接指示。该作品在冲绳胶体国际会议上获得了最佳海报奖。