Xu Liguo, Huang Zhenkai, Deng Zhishuang, Du Zhukang, Sun Tao Lin, Guo Zi-Hao, Yue Kan
South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering, South China University of Technology, Guangzhou, 510640, China.
Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou, 510640, China.
Adv Mater. 2021 Dec;33(51):e2105306. doi: 10.1002/adma.202105306. Epub 2021 Oct 13.
Ionogels have gained increasing attentions as a flexible conductive material. However, it remains a big challenge to integrate multiple functions into one gel that can be widely applied in various complex scenes. Herein, a kind of multifunctional ionogels with a combination of desirable properties, including transparency, high stretchability, solvent and temperature resistance, recyclability, high conductivity, underwater self-healing ability, and underwater adhesiveness is reported. The ionogels are prepared via one-step photoinitiated polymerization of 2,2,2-trifluoroethyl acrylate and acrylamide in a hydrophobic ionic liquid. The abundant noncovalent interactions including hydrogen bonding and ion-dipole interactions endow the ionogels with excellent mechanical strength, resilience, and rapid self-healing capability at room temperature, while the fluorine-rich polymeric matrix brings in high tolerance against water and various organic solvents, as well as tough underwater adhesion on different substrates. Wearable strain sensors based on the ionogels can sensitively detect and differentiate large body motions, such as bending of limbs, walking and jumping, as well as subtle muscle movements, such as pronunciation and pulse. It is believed that the designed ionogels will show great promises in wearable devices and ionotronics.
离子凝胶作为一种柔性导电材料越来越受到关注。然而，将多种功能集成到一种可广泛应用于各种复杂场景的凝胶中仍然是一个巨大的挑战。在此，报道了一种具有多种理想性能组合的多功能离子凝胶，包括透明度、高拉伸性、耐溶剂和耐温性、可回收性、高导电性、水下自修复能力和水下粘附性。这些离子凝胶是通过在疏水性离子液体中对丙烯酸2,2,2-三氟乙酯和丙烯酰胺进行一步光引发聚合制备的。丰富的非共价相互作用，包括氢键和离子偶极相互作用，赋予离子凝胶优异的机械强度、弹性和室温下的快速自修复能力，而富含氟的聚合物基质则使其对水和各种有机溶剂具有高耐受性，以及在不同基材上具有坚韧的水下粘附性。基于离子凝胶的可穿戴应变传感器能够灵敏地检测和区分大幅度的身体运动，如四肢弯曲、行走和跳跃，以及细微的肌肉运动，如发音和脉搏。相信所设计的离子凝胶在可穿戴设备和离子电子学中将展现出巨大的潜力。
