Research Institution for Biomimetics and Soft Matter, The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province, Research Center of Biomedical Engineering of Xiamen, Department of Biomaterials, College of Materials, The State Key Laboratory of Marine Environmental Science (MEL), College of Ocean and Earth Sciences, Shenzhen Research Institute of Xiamen University, Xiamen University, 422 Siming Nan Road, Xiamen, 361005, People's Republic of China.
Printed Intelligent Device Group, Singapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A*STAR), Singapore, 636732, Republic of Singapore.
Adv Sci (Weinh). 2023 Jul;10(19):e2300857. doi: 10.1002/advs.202300857. Epub 2023 Apr 24.
Ionogels prepared from ionic liquid (IL) have the characteristics of nonevaporation and stable performance relative to traditional hydrogels. However, the conductivities of commonly used ionogels are at very low relative to traditional hydrogels because the large sizes of the cation and anion in an IL impedes ion migration in polymer networks. In this study, ultradurable ionogels with suitable mechanical properties and high conductivities are prepared by impregnating IL into a safe, environmentally friendly water-based polyurethane (WPU) network by mimicking the ion transport channels in the phospholipid bilayer of the cell membrane. The increase in electrical conductivity is attributed to the introduction of carboxylic acid in the hard segment of WPU; this phenomenon regularly arranges hard segment structural domains by hydrogen bonding, forming ionic conduction channels. The conductivities of their ionogels are >28-39 mS cm . These ionogels have adjustable mechanical properties that make the Young's modulus value (0.1-0.6 MPa) similar to that of natural skin. The strain sensor has an ultrahigh sensitivity that ranges from 0.99 to 1.35, with a wide sensing range of 0.1%-200%. The findings are promising for various ionotronics requiring environmental stability and high conductivity characteristics.
本研究通过模拟细胞膜磷脂双层中的离子传输通道，将离子液体（IL）浸渍到安全、环保的水性聚氨酯（WPU）网络中，制备出具有合适力学性能和高导电性的超耐用离子凝胶。WPU 硬段中引入的羧酸基团通过氢键规则排列硬段结构域，形成离子传导通道，这是电导率提高的原因。离子凝胶的电导率>28-39 mS cm 。这些离子凝胶具有可调节的力学性能，使杨氏模量值（0.1-0.6 MPa）与天然皮肤相似。应变传感器具有超高的灵敏度，范围从 0.99 到 1.35，具有 0.1%-200%的宽检测范围。这些发现有望应用于各种需要环境稳定性和高导电性的离子电子学领域。
