College Of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China.
Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, PR China.
Int J Biol Macromol. 2024 Jun;270(Pt 1):132142. doi: 10.1016/j.ijbiomac.2024.132142. Epub 2024 May 7.
The severe negative effects of impurities adhering to the external surface of wearable devices can significantly influence the signal transmission, performance, and lifespan of hydrogel sensors. Herein, we developed an ion-conducting hydrogel sensor with a strong adhesive side and a non-adhesive side, similar to a "semi-releasing material." This hydrogel, formulated using deep eutectic solvents obtained from choline chloride and acrylic acid, contained lignin. This versatile material, exhibiting properties similar to semi-releasing materials, was treated with an AlCl solution on one side. Additionally, the hydrogel was successfully used as a highly adhesive strain sensor for real-time monitoring of various human activity signals. Moreover, the hydrogel demonstrated excellent environmental tolerance and conductivity. Lignin extracted from wood flour endowed the hydrogel sensor with excellent adhesion energy (up to 427.1 J/m) and UV resistance. Treatment of hydrogels with AlCl completely eliminated their adhesiveness, thereby enhancing fracture elongation and tensile strength. This improvement can be attributed to the absence of carboxyl groups and the formation of a metal-phenolic network. The implementation of this convenient and efficient strategy provides a more feasible approach to address challenges related to impurity adhesion and signal transmission in flexible wearable devices.
杂质附着在可穿戴设备外表面会产生严重的负面影响，这可能显著影响水凝胶传感器的信号传输、性能和寿命。在此，我们开发了一种具有强粘附侧和非粘附侧的导离子水凝胶传感器，类似于“半释放材料”。这种水凝胶是由氯化胆碱和丙烯酸制成的深共晶溶剂和木质素制成的。这种多功能材料类似于半释放材料，一侧用 AlCl 溶液处理。此外，该水凝胶还成功用作高粘性应变传感器，用于实时监测各种人体活动信号。此外，该水凝胶还表现出优异的环境耐受性和导电性。从木粉中提取的木质素赋予水凝胶传感器优异的粘附能（高达 427.1 J/m）和耐紫外线性。用 AlCl 处理水凝胶可以完全消除其粘性，从而提高断裂伸长率和拉伸强度。这一改进可归因于羧基的不存在和金属-酚网络的形成。这种方便有效的策略的实施为解决柔性可穿戴设备中杂质粘附和信号传输相关的挑战提供了更可行的方法。
