Deep Eutectic Solvent‐Based Ultra‐Stretchable, Anti‐Freezing, and Ambient‐Stable Supramolecular Ionogel for Wearable Sensor

• Published in: Macromolecular materials and engineering Vol. 307; no. 10
• Main Authors: Yang, Jia, Fan, Jianghuan, Liu, Zhuangzhuang, Zhang, Bin, Qin, Gang, Liu, Shuzheng, Shi, Xinlei, Zhu, Lin, Sun, Gengzhi, Chen, Qiang
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01.10.2022
• Subjects: Acrylamide; anti‐freezing gels; deep eutectic solvents; Electronic devices; environmental stability; Fatigue strength; Freezing; high strength; Human motion; Hydrogels; Low temperature; Solvents; Stability; wearable sensors
• ISSN: 1438-7492; 1439-2054
• DOI: 10.1002/mame.202200248

Hydrogels are widely used in electronic devices due to their excellent properties. However, traditional hydrogels have problems such as freezing at low temperature and loss of water. Herein, a super‐stretchable, tough, self‐healing, and transparent supramolecular ionogel is fabricated by polymerizing N‐hydroxyethyl acrylamide in deep eutectic solvent (DES) without chemical cross‐linkers. The ionogel shows good self‐recovery and excellent fatigue resistance. Due to the use of DES without water, the prepared ionogel has low‐temperature resistance and environmental stability. Furthermore, the ionogel can be used as a strain sensor to monitor human movement, even at low temperatures. Therefore, this work provides a simple and promising strategy for designing DES‐based ionogels with freeze resistance and environmental stability. A supramolecular ionic gel with super‐stretchable, tough, self‐healing and transparent properties is prepared by polymerization of N‐hydroxyethyl acrylamide in deep eutectic solvent. The ionogel has good self‐recovery ability, fatigue resistance, good resistance to low temperature and high environmental stability. Moreover, the gel can also be used as strain sensors to monitor human movement even at low temperatures.