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.

已经建立了通过从 1 mm 的有限空间蒸发液晶 (LC) 多糖溶液来制造单轴取向 3-D 膜结构的方法。多糖、黄原胶和蔗糖具有高分子量和溶致液晶特性，积聚在一个位置，作为薄膜的核，随后桥接两个基材并随着下降的空气-液晶界面生长。进一步研究了引导多糖桥联沉积的液晶态及其形状的作用，并探索了相关的流变特性。蓝藻胞外多糖萨克兰 (a) 的水溶液由棒状 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，通过批量提取获得的另一种萨克兰溶液，即含有棒状和片状液晶单元的萨克兰（b），可以桥接干燥池基板之间非常厚的间隙。干燥空气-LC 界面处的强相互作用有助于片状单元与棒状单元明确对齐。这项工作中的物理见解恢复了使用液晶生物聚合物来制备长程有序结构，而无需使用复杂的设置/仪器。此外，它还直接表明了在永久干燥环境下自然界中存在的结构单元的作用。该作品在冲绳胶体国际会议上获得认可并荣获最佳海报奖。