Jiang Zhicheng, Ji Zhengxiao, Zhu Mengni, Ma Wenjing, Gao Shuting, Xu Min
School of Physics and Electronic Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200241, China.
Joint Laboratory of Advanced Biomedical Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2024 Sep 24;280(Pt 3):135947. doi: 10.1016/j.ijbiomac.2024.135947.
To date, conductive hydrogels as an alternative to traditional rigid metallic conductors have attracted much attention in the field of flexible wearable electronic devices due to their inherent characteristics. Herein, a conductive bacterial cellulose (BC) nanocomposite hydrophobic-association (HA) hydrogel with highly stretchable, strong, self-healing, and notch-insensitive was fabricated by introducing the hydrophobic association. The obtained BCNC HA hydrogel shows excellent mechanical properties (∼ 2400 % of stress and ∼ 0.35 MPa of mechanical strength), superior notch-insensitive property with a fracture energy of ∼38 KJ.m, and good self-healing property (healing efficiency of ∼97 %). In addition, the hydrogel exhibits excellent ionic conductivity of ∼1.90 S.m and high sensing sensitivity toward tensile deformation. The wearable strain sensor based on this material is assembled can detect both large-scale motions and subtle body motions in real time, which show excellent durability (1000 cycles with the strain of 30 %). Thus, the BCNC HA hydrogels have promising potential in various wearable flexible electronic devices for artificial intelligence and human-machine interface applications in the future.
迄今为止，导电水凝胶作为传统刚性金属导体的替代品，因其固有特性在柔性可穿戴电子设备领域备受关注。在此，通过引入疏水缔合制备了一种具有高拉伸性、高强度、自愈合和抗缺口敏感性的导电细菌纤维素（BC）纳米复合疏水缔合（HA）水凝胶。所制备的BCNC HA水凝胶表现出优异的力学性能（应力约为2400%，机械强度约为0.35MPa）、卓越的抗缺口敏感性，断裂能约为38KJ·m，以及良好的自愈合性能（愈合效率约为97%）。此外，该水凝胶表现出约1.90S·m的优异离子导电性和对拉伸变形的高传感灵敏度。基于这种材料组装的可穿戴应变传感器能够实时检测大规模运动和细微的身体运动，表现出优异的耐久性（在30%应变下循环1000次）。因此，BCNC HA水凝胶在未来用于人工智能和人机界面应用的各种可穿戴柔性电子设备中具有广阔的潜力。
