Tong Ruiping, Ma Zhihui, Gu Ping, Yao Rui, Li Tengfei, Zeng Mingshun, Guo Fazhan, Liu Linfeng, Xu Junfei
Key Laboratory of Air-driven Equipment of Zhejiang Province, College of Mechanical Engineering, Quzhou University, Quzhou 324000, China.
Key Laboratory of Air-driven Equipment of Zhejiang Province, College of Mechanical Engineering, Quzhou University, Quzhou 324000, China.
Int J Biol Macromol. 2023 Aug 15;246:125683. doi: 10.1016/j.ijbiomac.2023.125683. Epub 2023 Jul 5.
Ionic conductive hydrogel fibers based on natural polymers provide an immense focus for a new generation of electronics due to their flexibility and knittability. The feasibility of utilizing pure natural polymer-based hydrogel fibers could be drastically improved if their mechanical and transparent performances satisfy the requirements of actual practice. Herein, we report a facile fabrication strategy for significantly stretchable and sensitive sodium alginate ionic hydrogel fibers (SAIFs), by glycerol initiating physical crosslinking and by CaCl inducing ionic crosslinking. The obtained ionic hydrogel fibers not only show significant stretchability (tensile strength of 1.55 MPa and fracture strain of ∼161 %), but also exhibit wide-range sensing, satisfactorily stable, rapidly responsive, and multiply sensitive abilities to external stimulus. In addition, the ionic hydrogel fibers have excellent transparency (over 90 % in a wide wavelength range), and good anti-evaporation and anti-freezing properties. Furthermore, the SAIFs have been easily knitted into a textile, and successfully applied as wearable sensors to recognize human motions, by observing the output electrical signals. Our methodology for fabrication intelligent SAIFs will shed light on artificial flexible electronics and other textile-based strain sensors.
基于天然聚合物的离子导电水凝胶纤维因其柔韧性和可编织性而成为新一代电子产品的一大焦点。如果基于纯天然聚合物的水凝胶纤维的机械性能和透明性能满足实际应用的要求，那么其利用可行性将得到大幅提高。在此，我们报告了一种简便的制备策略，用于制备具有显著拉伸性和敏感性的海藻酸钠离子水凝胶纤维（SAIFs），该策略通过甘油引发物理交联以及氯化钙诱导离子交联来实现。所制备的离子水凝胶纤维不仅具有显著的拉伸性（拉伸强度为1.55兆帕，断裂应变约为161%），还展现出宽范围传感、令人满意的稳定性、快速响应以及对外部刺激的多重敏感能力。此外，离子水凝胶纤维具有优异的透明度（在宽波长范围内超过90%），以及良好的抗蒸发和抗冻性能。再者，SAIFs已被轻松编织成织物，并通过观察输出电信号成功应用于可穿戴传感器以识别人体运动。我们制备智能SAIFs的方法将为人工柔性电子产品及其他基于纺织品的应变传感器提供启示。
