College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; Fast-growing Tree & Agro-fibre Materials Engineering Center, Nanjing Forestry University, Nanjing 210037, China.
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; Fast-growing Tree & Agro-fibre Materials Engineering Center, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 6):127396. doi: 10.1016/j.ijbiomac.2023.127396. Epub 2023 Oct 11.
Bioelectronics based on high-performance conductive ionic hydrogels, which can create novel technological interfaces with the human body, have attracted significant interest from both academia and industry. However, it is still a challenge to fabricate hydrogel sensor with integration of good mechanical properties, fast self-healing ability and flexible strain sensitivity below 0 °C. In this paper, we present a moldable, self-healing and adhesive cellulose-based ionic conductive hydrogel with strain-sensitivity, which was prepared by forming dual-crosslinked networks using poly(vinyl alcohol) (PVA) with borax, calcium chloride (CaCl), zinc chloride (ZnCl) and 2,2,6,6-tetramethylpiperidine-1-oxyl oxidized cellulose nanofibril (TCNF). The hydrogel exhibited fast self-healing within 10 s, moderate modulus of 5.13 kPa, high elongation rate of 1500 % and excellent adhesion behavior on various substrates. Due to multiple hydrogen bonding and the presence of CaCl and ZnCl, the hydrogel presented a reduced freezing point as low as -41.1 °C, which enabled its application as a low-temperature strain sensor. The proposed hydrogel provides a simple and facile method for fabricating multi-functional hydrogels that can be used as suitable strain sensors for applications such as wearable electronic sensor, soft robotics and electronic skins in a wide temperature range.
基于高性能导电离子水凝胶的生物电子学可以与人体创建新颖的技术接口，引起了学术界和工业界的极大兴趣。然而，制造具有良好机械性能、快速自修复能力和低于 0°C 的灵活应变灵敏度的水凝胶传感器仍然是一个挑战。在本文中，我们提出了一种可模塑、自修复和具有粘附性的纤维素基离子导电水凝胶，其具有应变敏感性，是通过使用硼砂、氯化钙 (CaCl)、氯化锌 (ZnCl) 和 2,2,6,6-四甲基哌啶-1-氧自由基氧化纤维素纳米纤维（TCNF）形成双交联网络制备的。该水凝胶在 10 秒内快速自修复，模量适中为 5.13 kPa，伸长率高达 1500%，对各种基底具有优异的粘附性能。由于存在多重氢键以及 CaCl 和 ZnCl 的存在，水凝胶的冰点低至-41.1°C，使其可作为低温应变传感器使用。所提出的水凝胶提供了一种简单易行的方法来制造多功能水凝胶，可将其用作适用于可穿戴电子传感器、软机器人和电子皮肤等广泛温度范围的应用的合适应变传感器。
