Qi Yu-Ling, Zhou Hao-Yu, Han Guo-Zhi
College of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 211816 P. R. China
RSC Adv. 2025 Jun 23;15(27):21300-21310. doi: 10.1039/d5ra01507c.
Self-healing hydrogels have the ability to repair themselves at the incision after being damaged and can return to their original state of morphology and performance. However, constructing a hydrogel with superior mechanical strength and tensile properties after self-healing remains a challenge. In this work, using polyvinyl alcohol, borax, chitosan, and a type of SiO@g-CN@TiO nanoparticles as raw materials, a novel photo-regulated self-healing hydrogel was developed using a freezing-thawing method, which could achieve a synchronous increase in Young's modulus and tensile strength under visible light irradiation during the self-healing process. In addition, the doping of the SiO@g-CN@TiO nanoparticles improved the self-healing performance of the PVA-based hydrogels. With the addition of a trace amount of SiO@g-CN@TiO nanoparticles, the self-healing efficiency of the hydrogel increased from 26.67% to 45.67% in darkness and from 41.33% to 65.67% under visible light irradiation.
自愈合水凝胶在受损后能够在切口处自行修复，并可恢复到其原始的形态和性能状态。然而，构建一种在自愈合后具有优异机械强度和拉伸性能的水凝胶仍然是一项挑战。在这项工作中，以聚乙烯醇、硼砂、壳聚糖和一种SiO@g-CN@TiO纳米颗粒为原料，采用冻融法制备了一种新型的光调控自愈合水凝胶，该水凝胶在自愈合过程中在可见光照射下能够实现杨氏模量和拉伸强度的同步增加。此外，SiO@g-CN@TiO纳米颗粒的掺杂提高了基于聚乙烯醇的水凝胶的自愈合性能。添加微量的SiO@g-CN@TiO纳米颗粒后，水凝胶在黑暗中的自愈合效率从26.67%提高到45.67%，在可见光照射下从41.33%提高到65.67%。
