Xia Meng, Pan Shenxin, Li Hanhong, Yi Xiao, Zhan Yuan, Sun Zhengguang, Jiang Xueliang, Zhang Yuhong
Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials (Hubei University), College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China.
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, China.
J Biomater Sci Polym Ed. 2021 Aug;32(12):1548-1563. doi: 10.1080/09205063.2021.1922170. Epub 2021 Aug 1.
Nowadays, great effort has been devoted to fabricate flexible wearable sensor with high stretchability, moderate modulus, favorable durability, excellent transparency, and satisfactory sensitivity. In this work, we report the preparation of a hybrid double-network (DN) hydrogel by a simple one-pot method. First, chitosan was added into an AlCl solution to form Al-chitosan complex (CS-Al). Second, the hybrid CS/Al-poly(acrylamide) (PAM) DN hydrogels were constructed polymerization of acrylamide (AM) in present of Al-chitosan complex. Thanks to the existence of electrically conductive CS-Al networks, the resulting hybrid DN hydrogel exhibits excellent stretchability, fatigue resistance, transparency, and conductivity. Furthermore, the CS/Al-PAM DN hydrogel could be used as strain sensor, and demonstrates many desired virtues, including satisfactory sensitivity (gauge factors of 1.7-12.1), wide detection range (up to 1500%), low limit of discernment (1% strain), high reliability, and excellent durability (1000 cycles). More significantly, the manufactured hydrogel-based strain sensor can be employed as wearable devices to precisely detect various human movements.
如今，人们致力于制造具有高拉伸性、适度模量、良好耐久性、优异透明度和令人满意灵敏度的柔性可穿戴传感器。在这项工作中，我们报道了通过一种简单的一锅法制备混合双网络（DN）水凝胶。首先，将壳聚糖添加到AlCl溶液中形成Al-壳聚糖络合物（CS-Al）。其次，在Al-壳聚糖络合物存在下通过丙烯酰胺（AM）的聚合构建混合CS/Al-聚（丙烯酰胺）（PAM）DN水凝胶。由于导电CS-Al网络的存在，所得的混合DN水凝胶表现出优异的拉伸性、抗疲劳性、透明度和导电性。此外，CS/Al-PAM DN水凝胶可用作应变传感器，并表现出许多理想的特性，包括令人满意的灵敏度（应变系数为1.7 - 12.1）、宽检测范围（高达1500%）、低辨别限（1%应变）、高可靠性和优异的耐久性（1000次循环）。更重要的是，制造的基于水凝胶的应变传感器可作为可穿戴设备用于精确检测各种人体运动。
