Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China.
ACS Appl Mater Interfaces. 2021 May 26;13(20):24173-24182. doi: 10.1021/acsami.1c05098. Epub 2021 May 14.
Adaptability could meet basic technological application requirements. Therefore, a hydrogel-based transducer with durable adhesion, ultrahigh toughness, and super resilience was highly demanded. Here, a skin-like hydrogel transducer was successfully prepared through introducing carboxymethyl chitosan and sodium caseinate into a polyacrylamide hydrogel system. In addition, the polyacrylamide-sodium casein-carboxymethyl chitosan (PAAM-SC-CC) hydrogel has strong mechanical properties and excellent mechanical flexibility, largely due to the adequate energy dissipation mechanism. Surprisingly, the PAAM-SC-CC hydrogel exhibited stable and reproducible adhesion to various solid substrates and the human skin. Due to abundant free ions driven from sodium caseinate, the PAAM-SC-CC hydrogel could maintain stable and sensitive ionic conductivity without adding additional fillers. Experiments have proved that it can be applied to the field of human motion monitoring with complex signals. Therefore, the PAAM-SC-CC hydrogel sensor could monitor human movement in different strain ranges, including throat movement and joint extension. Such a flexible hydrogel-based transducer with various properties is conceivable to broaden the application field of bioelectrodes, human machines, personalized medical health fields, etc.
可适应性能满足基本的技术应用要求。因此，人们高度需要一种具有耐用附着力、超高韧性和超弹性的水凝胶基换能器。在这里，通过将羧甲基壳聚糖和酪蛋白酸钠引入到聚丙烯酰胺水凝胶体系中，成功制备了一种类似皮肤的水凝胶换能器。此外，由于具有充足的能量耗散机制，聚丙烯酰胺-酪蛋白酸钠-羧甲基壳聚糖（PAAM-SC-CC）水凝胶具有很强的机械性能和优异的机械灵活性。令人惊讶的是，PAAM-SC-CC 水凝胶对各种固体基底和人体皮肤表现出稳定且可重复的附着力。由于酪蛋白酸钠带来的丰富的自由离子，PAAM-SC-CC 水凝胶无需添加额外的填料即可保持稳定且灵敏的离子电导率。实验证明，它可以应用于具有复杂信号的人体运动监测领域。因此，PAAM-SC-CC 水凝胶传感器可以监测不同应变范围内的人体运动，包括喉咙运动和关节伸展。这种具有各种性能的柔性水凝胶基换能器有望拓宽生物电极、人机、个性化医疗健康等领域的应用范围。
