Flexible organohydrogel ionic skin with Ultra-Low temperature freezing resistance and Ultra-Durable moisture retention

作者：Peng, Wenwu; Han, Lu; Gao, Yang; Gong, Zhiwei; Lu, Ting; Xu, Xingtao^*; Xu, Min^*; Yamauchi, Yusuke; Pan, Likun^*

来源：Journal of Colloid and Interface Science, 2022, 608: 396-404.

DOI：10.1016/j.jcis.2021.09.125

• Ionic skin
• Anti-freezing
• Moisture retaining
• Fatigue resistant
• Organohydrogel

Hypothesis: One prevailing method to construct excellent temperature tolerance/long-lasting moisture hydrogels is to couple the original hydrogel networks with freezing-tolerant/moisture retaining agents, including ionic liquids, inorganic salts, zwitterionic osmolytes, and polyhydric alcohols. Among them, organohydrogels have shed new light on the development of ionic skins with long-term usability and stable sensing performance at subzero temperatures due to their long-lasting water retention and anti-freezing capability. @@@ Experiments: We report a dual network organohydrogel by doping conductive ZnSO4 into the double network hydrogel of polyvinyl alcohol-polyacrylamide (PVA-PAM) with subsequent immersing in a mixed solvent of ethylene glycol (EG) and H2O. The anti-freezing and moisture retaining abilities of the PVA/PAM/Zn/EG (PPZE) organohydrogel were studied and the sensing performances of the PPZE organohydrogel-based ionic skin were investigated. @@@ Findings: The organohydrogel exhibits a high conductivity (0.44 S m(-1)), excellent fatigue resistance and exceptional moisture retaining ability with more than 99.3% of the initial weight retention after 31 days storage at ambient temperature. Importantly, the PPZE organohydrogel-based ionic skin shows an ultra-low temperature anti-freezing ability and remains flexibility and sensing capability with a high sensitivity (signal response time similar to 0.23 s) even at -50 degrees C. The PPZE organohydrogel demonstrates a tremendous potential in artificial skin and health monitoring.

• 单位
  1; 华东理工大学