Polymeric and Soft Materials Laboratory, School of Chemical Engineering, and Advanced Institute of Materials Science, Changchun University of Technology, Changchun, 130012, P. R. China.
J Mater Chem B. 2019 Sep 14;7(34):5230-5236. doi: 10.1039/c9tb01340g. Epub 2019 Aug 5.
Flexible hydrogel-based sensors have attracted significant attention due to promising applications of wearable devices. However, fabricating a flexible hydrogel combining toughness, stickiness, anti-freezing capability and conductivity is still a great challenge. Here, casein and LiCl are successfully introduced into a polyacrylamide hydrogel to prepare a tough and adhesive PAAm/casein hydrogel, which exhibits good mechanical properties and excellent reversible adhesive behavior for diverse materials and human skin. Due to the presence of conductive ions, the PAAm/casein hydrogel exhibits high conductivity (0.0753 S cm) and anti-freezing properties (-21 °C). Moreover, the PAAm/casein hydrogel as a flexible wearable strain sensor is sensitive to both large-scale human motions (e.g., joint bending) and tiny physiological signals (e.g., speaking). It is envisioned that the strategy would provide novel inspiration for the development of flexible wearable protein-driven hydrogel devices.
基于水凝胶的柔性传感器因其在可穿戴设备中的应用前景而受到广泛关注。然而，制备兼具韧性、粘性、抗冻性和导电性的柔性水凝胶仍然是一个巨大的挑战。在这里，成功地将酪蛋白和 LiCl 引入聚丙烯酰胺水凝胶中，制备了一种坚韧且具有粘附性的 PAAm/酪蛋白水凝胶，该水凝胶具有良好的机械性能和对各种材料及人体皮肤的优异的可逆粘附性能。由于存在导电离子，PAAm/酪蛋白水凝胶具有高导电性（0.0753 S cm）和抗冻性（-21°C）。此外，作为一种柔性可穿戴应变传感器，PAAm/酪蛋白水凝胶对大规模人体运动（如关节弯曲）和微小生理信号（如说话）都很敏感。可以预见，该策略将为开发柔性可穿戴蛋白驱动水凝胶器件提供新的思路。
