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Strong and Tough Conductive Organo-Hydrogels via Freeze-Casting Assisted Solution Substitution
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-05-17 , DOI: 10.1002/adfm.202203610 Xinyu Dong 1 , Xiao Guo 1 , Quyang Liu 1 , Yijing Zhao 1 , Haobo Qi 1 , Wei Zhai 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-05-17 , DOI: 10.1002/adfm.202203610 Xinyu Dong 1 , Xiao Guo 1 , Quyang Liu 1 , Yijing Zhao 1 , Haobo Qi 1 , Wei Zhai 1
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High strength, toughness, and conductivity are among the most sought-after properties of flexible electronics. However, existing engineering materials find it difficult to achieve both excellent mechanical properties and high conductivity. To address this challenge, this study proposes a facile yet versatile strategy for preparing super-tough conductive organo-hydrogels via freeze-casting assisted solution substitution (FASS). This FASS strategy enables the formation of organo-hydrogels in one step with exquisite hierarchical anisotropic structures coupled with synergistic strengthening and toughening effects across multiple length scales. As an exemplary material, the prepared polyvinyl alcohol (PVA) organo-hydrogel with solvent content up to 87 wt% exhibits a combination of high strength (6.5 MPa), high stretchability (1710% in strain), ultra-high toughness (58.9 MJ m−3), as well as high ionic conductivity up to 6.5 S m−1 with excellent strain sensitivity. The exceptional combination of mechanical properties and conductivity makes the PVA organo-hydrogel a promising flexible electronics material. In addition, the FASS strategy can also endow hydrogels with multi-functions, including thermo-healability, freezing tolerance and shape recoverability, and can be applied to various hydrogel materials, such as carboxymethyl cellulose, sodium alginate, and chitosan. Hence, this work provides an all-around solution for preparing advanced strong and tough conductive soft materials for a multitude of applications.
中文翻译：
通过冷冻铸造辅助溶液替代的强韧导电有机水凝胶
高强度、韧性和导电性是柔性电子产品最受欢迎的特性之一。然而，现有的工程材料很难同时实现优异的机械性能和高导电性。为了应对这一挑战，本研究提出了一种简便而通用的策略，用于通过冷冻浇铸辅助溶液替代 (FASS) 制备超坚韧的导电有机水凝胶。这种 FASS 策略能够一步形成有机水凝胶，具有精细的分层各向异性结构以及跨多个长度尺度的协同强化和增韧效应。作为示例性材料，所制备的溶剂含量高达 87 wt% 的聚乙烯醇 (PVA) 有机水凝胶表现出高强度 (6.5 MPa)、高拉伸性 (应变 1710%)、-3 )，以及高达 6.5 S m -1的高离子电导率和出色的应变灵敏度。机械性能和导电性的出色结合使 PVA 有机水凝胶成为一种很有前途的柔性电子材料。此外，FASS 策略还可以赋予水凝胶多种功能，包括热愈合性、耐冻性和形状恢复性，并可应用于多种水凝胶材料，如羧甲基纤维素、海藻酸钠和壳聚糖。因此，这项工作为制备适用于多种应用的先进强韧导电软材料提供了一个全方位的解决方案。
更新日期：2022-05-17
中文翻译：
通过冷冻铸造辅助溶液替代的强韧导电有机水凝胶
高强度、韧性和导电性是柔性电子产品最受欢迎的特性之一。然而，现有的工程材料很难同时实现优异的机械性能和高导电性。为了应对这一挑战，本研究提出了一种简便而通用的策略，用于通过冷冻浇铸辅助溶液替代 (FASS) 制备超坚韧的导电有机水凝胶。这种 FASS 策略能够一步形成有机水凝胶，具有精细的分层各向异性结构以及跨多个长度尺度的协同强化和增韧效应。作为示例性材料，所制备的溶剂含量高达 87 wt% 的聚乙烯醇 (PVA) 有机水凝胶表现出高强度 (6.5 MPa)、高拉伸性 (应变 1710%)、-3 )，以及高达 6.5 S m -1的高离子电导率和出色的应变灵敏度。机械性能和导电性的出色结合使 PVA 有机水凝胶成为一种很有前途的柔性电子材料。此外，FASS 策略还可以赋予水凝胶多种功能，包括热愈合性、耐冻性和形状恢复性，并可应用于多种水凝胶材料，如羧甲基纤维素、海藻酸钠和壳聚糖。因此，这项工作为制备适用于多种应用的先进强韧导电软材料提供了一个全方位的解决方案。
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