纤维素离子凝胶的制备及性能

Preparation and properties of cellulose ionic gel

开发高性能的导电凝胶已经成为推动柔性电子设备进一步发展的基石。以天然纤维素为凝胶骨架,以离子液体为导电介质,通过加热溶解-冷却凝胶化过程可以制备高性能的绿色离子液体-纤维素复合凝胶(CGel)。复合凝胶中的纤维素基体呈现三维网络结构,并包含大量的孔洞,可以有效吸附和储存离子液体,实现离子液体在纤维素基体中的均匀分布。纤维素离子复合凝胶具有较高的模量(G′>G″)、优异的透明度(88%)、良好的电学性能(2.2 mS/cm)及柔韧性。进一步通过高温加热-冷却凝胶化过程能够实现纤维素离子凝胶体系的再循环生产过程。纤维素离子凝胶展现了对水分子的高度敏感性,其电导率正比于工作湿度,有望应用于环境湿度及人体皮肤状况的高效监督检测。

The development of high-performance ionic gel can significantly promote the flexible electronic devices.In this study, an environmentally friendly cellulose-based ionic gel(CGel) had been designed based on the heatingcooling process, where the natural cellulose functioned as the gel framework, and the ionic liquid worked as the conductive material. In the CGel, the cellulose possesses a 3 D porous structure, which can effectively adsorb and reserve the ionic liquid. The CGel presents high modules(G′>G″), superior transparency of 88% and conductivity of2.2 mS/cm, as well as desirable flexibility. In addition, the CGel system features a recycled and reproductive character based on a hot-temperature heating and cooling gelation process. More interestingly, the cellulose-based gel is extremely sensitive to the water molecules, where the conductivity of the CGel features a positive relationship with the humidity, leading to a promising potential for real-time monitoring the environmental humidity and human skin conditions.