材料科学
纳米复合材料
植酸
纳米晶
自愈水凝胶
纤维素
纳米技术
自愈
复合数
电导率
聚吡咯
复合材料
化学工程
聚合物
高分子化学
化学
聚合
生物化学
替代医学
病理
工程类
医学
物理化学
作者
Dongqi Yue,Sheng‐Cai Shi,Liangjiu Bai,Liangjiu Bai,Wenxiang Wang,Na Yang,Lixia Yang,Daming Wei
摘要
For hydrogel-based flexible sensors, it is a challenge to enhance the stability at sub-zero temperatures while maintaining good self-healing properties. Herein, an anti-freezing nanocomposite hydrogel with self-healing properties and conductivity was designed by introducing cellulose nanocrystals (CNCs) and phytic acid (PA). The CNCs were grafted with polypyrrole (PPy) by chemical oxidation, which were used as the nanoparticle reinforcement phase to reinforce the mechanical strength of hydrogels (851.8%). PA as a biomass material could form strong hydrogen bond interactions with H2O molecules, endowing hydrogels with prominent anti-freezing properties. Based on the non-covalent interactions, the self-healing rate of the hydrogels reached 92.9% at -15 °C as the content of PA was 40.0 wt%. Hydrogel-based strain sensors displayed high sensitivity (GF = 0.75), rapid response time (350 ms), good conductivity (3.1 S m-1) and stability at -15 °C. Various human movements could be detected by using them, including small (smile and frown) and large changes (elbow and knee bending). This work provides a promising method for the development of flexible wearable sensors that work stably in frigid environments.
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