Cui Liangliang, Hu Chunyan, Wang Wei, Zheng Jian, Zhu Zhijia, Liu Baojiang
Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, Donghua University, College of Chemistry and Chemical Engineering, Innovation Center for Textile Science and Technology, No. 2999 North Renmin Road, Shanghai 201620, China.
Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education, Donghua University, College of Chemistry and Chemical Engineering, Innovation Center for Textile Science and Technology, No. 2999 North Renmin Road, Shanghai 201620, China; Department of Textile & Garment Engineering, Changshu Institute of Technology, Suzhou 215500, China.
J Colloid Interface Sci. 2025 Jan;677(Pt A):273-281. doi: 10.1016/j.jcis.2024.07.214. Epub 2024 Jul 29.
Wearable electronics based on conductive hydrogels (CHs) offer remarkable flexibility, conductivity, and versatility. However, the flexibility, adhesiveness, and conductivity of traditional CHs deteriorate when they freeze, thereby limiting their utility in challenging environments. In this work, we introduce a PHEA-NaSS/G hydrogel that can be conveniently fabricated into a freeze-resistant conductive hydrogel by weakening the hydrogen bonds between water molecules. This is achieved through the synergistic interaction between the charged polar end group (-SO) and the glycerol-water binary solvent system. The conductive hydrogel is simultaneously endowed with tunable mechanical properties and conductive pathways by the modulation caused by varying material compositions. Due to the uniform interconnectivity of the network structure resulting from strong intermolecular interactions and the enhancement effect of charged polar end-groups, the resulting hydrogel exhibits 174 kPa tensile strength, 2105 % tensile strain, and excellent sensing ability (GF = 2.86, response time: 121 ms), and the sensor is well suited for repeatable and stable monitoring of human motion. Additionally, using the Full Convolutional Network (FCN) algorithm, the sensor can be used to recognize English letter handwriting with an accuracy of 96.4 %. This hydrogel strain sensor provides a simple method for creating multi-functional electronic devices, with significant potential in the fields of multifunctional electronics such as soft robotics, health monitoring, and human-computer interaction.
基于导电水凝胶（CHs）的可穿戴电子产品具有出色的柔韧性、导电性和多功能性。然而，传统CHs在冻结时其柔韧性、粘性和导电性会变差，从而限制了它们在具有挑战性环境中的应用。在这项工作中，我们引入了一种PHEA-NaSS/G水凝胶，通过削弱水分子之间的氢键，可以方便地将其制成抗冻导电水凝胶。这是通过带电极性端基（-SO）与甘油-水二元溶剂体系之间的协同相互作用实现的。通过改变材料组成引起的调制，导电水凝胶同时具有可调的机械性能和导电路径。由于分子间强相互作用导致的网络结构均匀互连以及带电极性端基的增强作用，所得水凝胶表现出174 kPa的拉伸强度、2105%的拉伸应变和出色的传感能力（GF = 2.86，响应时间：121 ms），并且该传感器非常适合对人体运动进行可重复和稳定的监测。此外，使用全卷积网络（FCN）算法，该传感器可用于识别英文字母笔迹，准确率为96.4%。这种水凝胶应变传感器为创建多功能电子设备提供了一种简单方法，在软机器人技术、健康监测和人机交互等多功能电子领域具有巨大潜力。
