State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
Int J Biol Macromol. 2023 Sep 30;249:125978. doi: 10.1016/j.ijbiomac.2023.125978. Epub 2023 Jul 27.
High strength, high toughness and high sensitivity were some of the most popular characteristics of flexible sensors. However, the mechanical properties and reproducibility of current single biomacromolecule gelatin hydrogel sensors are lower, and few hydrogel sensors have been able to provide excellent mechanical properties and flexibility at the same time so far. To address this challenge, a simple method to prepare tough polyvinyl alcohol (PVA) and gelatin hydrogel was proposed in this study. The PVA-gelatin-Fe biological macromolecules hydrogel was prepared by a freeze-casting-assisted solution substitution method, which exhibited high strength (2.5 MPa), toughness (7.22 MJ m), and excellent temperature, humidity, stress, strain, and human motion sensing properties. This combination of mechanical properties and flexibility makes PVA-gelatin biological macromolecules hydrogel a promising material for flexible sensing. In addition, an ionic immersion strategy could also impart multiple functions to the hydrogel and be applied to various hydrogel sensor materials. Thus, this work provided an all-around solution for the preparation of advanced and robust sensors with good application prospects.
高强度、高韧性和高灵敏度是柔性传感器最受欢迎的特性之一。然而，目前单一生物大分子明胶水凝胶传感器的机械性能和重现性较低，到目前为止，很少有水凝胶传感器能够同时提供优异的机械性能和柔韧性。针对这一挑战，本研究提出了一种简单的方法来制备坚韧的聚乙烯醇（PVA）和明胶水凝胶。通过冷冻铸造辅助溶液取代法制备了 PVA-明胶-Fe 生物大分子水凝胶，其表现出高的强度（2.5 MPa）、韧性（7.22 MJ m）以及优异的温度、湿度、应力、应变和人体运动传感性能。这种机械性能和柔韧性的结合使 PVA-明胶生物大分子水凝胶成为一种很有前途的柔性传感材料。此外，离子浸渍策略还可以赋予水凝胶多种功能，并应用于各种水凝胶传感器材料。因此，这项工作为制备具有良好应用前景的先进、坚固的传感器提供了全面的解决方案。
