Sun Lijie, Huang Hongfei, Zhang Luzhi, Neisiany Rasoul Esmaeely, Ma Xiaopeng, Tan Hui, You Zhengwei
Center for Child Care and Mental Health (CCCMH), Shenzhen Children's Hospital, Shenzhen, 518038, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Research Base of Textile Materials for Flexible Electronics and Biomedical Applications (China Textile Engineering Society), Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Donghua University, Shanghai, 201620, China.
Adv Sci (Weinh). 2024 Jan;11(3):e2305697. doi: 10.1002/advs.202305697. Epub 2023 Nov 23.
As stretchable conductive materials, ionogels have gained increasing attention. However, it still remains crucial to integrate multiple functions including mechanically robust, room temperature self-healing capacity, facile processing, and recyclability into an ionogel-based device with high potential for applications such as soft robots, electronic skins, and wearable electronics. Herein, inspired by the structure of spider silk, a multilevel hydrogen bonding strategy to effectively produce multi-functional ionogels is proposed with a combination of the desirable properties. The ionogels are synthesized based on N-isopropylacrylamide (NIPAM), N, N-dimethylacrylamide (DMA), and ionic liquids (ILs) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMI][TFSI]). The synergistic hydrogen bonding interactions between PNIPAM chains, PDMA chains, and ILs endow the ionogels with improved mechanical strength along with fast self-healing ability at ambient conditions. Furthermore, the synthesized ionogels show great capability for the continuous fabrication of the ionogel-based fibers using the melt-spinning process. The ionogel fibers exhibit spider-silk-like features with hysteresis behavior, indicating their excellent energy dissipation performance. Moreover, an interwoven network of ionogel fibers with strain and thermal sensing performance can accurately sense the location of objects. In addition, the ionogels show great recyclability and processability into different shapes using 3D printing. This work provides a new strategy to design superior ionogels for diverse applications.
作为可拉伸导电材料，离子凝胶已受到越来越多的关注。然而，将包括机械坚固性、室温自修复能力、易于加工和可回收性在内的多种功能集成到具有高应用潜力的基于离子凝胶的器件中，如软机器人、电子皮肤和可穿戴电子产品，仍然至关重要。在此，受蜘蛛丝结构的启发，提出了一种多级氢键策略，以有效地制备具有多种理想性能的多功能离子凝胶。这些离子凝胶是基于N-异丙基丙烯酰胺（NIPAM）、N，N-二甲基丙烯酰胺（DMA）和离子液体（ILs）1-乙基-3-甲基咪唑双（三氟甲基磺酰）亚胺（[EMI][TFSI]）合成的。PNIPAM链、PDMA链和ILs之间的协同氢键相互作用赋予离子凝胶更高的机械强度以及在环境条件下的快速自修复能力。此外，合成的离子凝胶在使用熔纺工艺连续制备基于离子凝胶的纤维方面表现出巨大的能力。离子凝胶纤维呈现出具有滞后行为的类似蜘蛛丝的特征，表明其优异的能量耗散性能。此外，具有应变和热传感性能的离子凝胶纤维交织网络能够精确感知物体的位置。此外，离子凝胶具有很强的可回收性，并且可以通过3D打印加工成不同形状。这项工作为设计用于各种应用的优质离子凝胶提供了一种新策略。
