Fast self-healing zwitterion nanocomposite hydrogel for underwater sensing. (August 2021)

• Record Type: Journal Article
• Authors: Sun, Xia; He, Shaoshuai; Qin, Zhihui; Li, Junjie; Yao, Fanglian
• Is Part Of: Composites communications. Volume 26(2021)
• Publication Date: 2021-08
• Subjects: Hydrogel -- Zwitterion -- Carbon nanotubes -- Nanocomposite -- Strain sensor
• DOI: 10.1016/j.coco.2021.100784
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: Conductive hydrogels have consistently attracted researchers' interests in the past few years. However, challenges still remain in the preparation of hydrogels with self-healing ability and underwater sensing capacity. In this work, we fabricate a novel fully-physically crosslinked nanocomposite hydrogel by incorporating gelatin dispersed carbon nanotubes (CNTs) into poly (sulfobetaine methacrylate) (PSBMA) network. The fully physically crosslinked PSBMA backbone and the nano reinforcement of CNTs endow hydrogel with fast self-healing ability (about 30 s) and good mechanical properties. Additionally, PSBMA/CNTs hydrogels exhibit high strain sensitivity (gauge factor up to 10.35) and pressure sensitivity (up to 0.256 kPa −1 ) and they can be fabricated as strain and pressure sensors to precisely monitor human movements. Moreover, the PSBMA/CNTs hydrogel sensor can detect human motions underwater owing to the anti-swelling feature. This work provides a feasible method to construct self-healing hydrogel sensors with strain and pressure sensing capacity and paves a way for underwater human motion sensors. Graphical abstract: Image 1 Highlights: CNTs was dispersed uniformly in water in the presence of gelatin. PSBMA/CNTs nanocomposite hydrogel displayed ultra-stretchability. Fully-physically crosslinked network contributed to self-healing property. PSBMA/CNTs hydrogel exhibited underwater sensing ability.