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Strong and Tough Conductive Organo-Hydrogels via Freeze-Casting Assisted Solution Substitution

机译：Strong and Tough Conductive Organo-Hydrogels via Freeze-Casting Assisted Solution Substitution

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摘要

High strength, toughness, and conductivity are among the most sought-afterproperties of flexible electronics. However, existing engineering materials findit difficult to achieve both excellent mechanical properties and high conductivity.To address this challenge, this study proposes a facile yet versatilestrategy for preparing super-tough conductive organo-hydrogels via freezecastingassisted solution substitution (FASS). This FASS strategy enablesthe formation of organo-hydrogels in one step with exquisite hierarchicalanisotropic structures coupled with synergistic strengthening and tougheningeffects across multiple length scales. As an exemplary material, theprepared polyvinyl alcohol (PVA) organo-hydrogel with solvent content up to87 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 ionicconductivity up to 6.5 S m~(?1) with excellent strain sensitivity. The exceptionalcombination of mechanical properties and conductivity makes the PVAorgano-hydrogel a promising flexible electronics material. In addition, theFASS strategy can also endow hydrogels with multi-functions, includingthermo-healability, freezing tolerance and shape recoverability, and can beapplied to various hydrogel materials, such as carboxymethyl cellulose,sodium alginate, and chitosan. Hence, this work provides an all-around solutionfor preparing advanced strong and tough conductive soft materials for amultitude of applications.

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