School of Chemistry and Materials Science, Ludong University, Key Laboratory of High Performance and Functional Polymer in the Universities of Shandong Province, Collaborative Innovation Center of Shandong Province for High Performance Fibers and Their Composites, Yantai, China.
School of Chemistry and Materials Science, Ludong University, Key Laboratory of High Performance and Functional Polymer in the Universities of Shandong Province, Collaborative Innovation Center of Shandong Province for High Performance Fibers and Their Composites, Yantai, China.
Int J Biol Macromol. 2021 May 15;179:324-332. doi: 10.1016/j.ijbiomac.2021.03.023. Epub 2021 Mar 5.
Recently, self-healing and high mechanical strength hydrogels have aroused much research due to their potential future in strain-sensitive flexible sensors. In this manuscript, we successfully designed self-healing and toughness cellulose nanocrystals (CNCs) nanocomposite hydrogels by grafted polypyrrole (PPy) on the surface of CNCs to enhance electrical conductivity. The obtained nanocomposite hydrogels exhibit outstanding self-healing and mechanical behaviors, and the optimal mechanical strength, toughness and self-healing efficiency can be up to 5.7 MPa, 810% and 89.6%, respectively. Using these functional nanocomposite hydrogels, strain-sensitive wearable flexible sensors were designed to monitor finger joint motions, bending of knee, and even the slight pulse beating. Surprisingly, the flexible sensors could evidently perceive body motions from large movements (knee bending) to tiny signals (pulse beating). In addition, it exhibited excellent durability after repeated cycles. This method of prepared self-healing nanocomposite hydrogels will have a potential prospect in the design of biomedical, biosensors, and flexible electronic devices.
最近，自修复和高强度水凝胶因其在应变敏感柔性传感器方面的潜在未来而引起了广泛的研究。在本文中，我们通过在 CNC 表面接枝聚吡咯 (PPy) 成功设计了自修复和韧性纤维素纳米晶体 (CNC) 纳米复合材料水凝胶，以提高电导率。所得到的纳米复合材料水凝胶表现出优异的自修复和机械性能，最佳的机械强度、韧性和自修复效率分别可达 5.7 MPa、810%和 89.6%。使用这些功能纳米复合材料水凝胶，设计了应变敏感可穿戴柔性传感器来监测手指关节运动、膝盖弯曲，甚至微弱的脉搏跳动。令人惊讶的是，柔性传感器可以明显感知到从大动作（膝盖弯曲）到微小信号（脉搏跳动）的身体运动。此外，它在经过多次循环后表现出优异的耐用性。这种制备自修复纳米复合材料水凝胶的方法在生物医学、生物传感器和柔性电子设备的设计方面具有广阔的前景。
