Hofmeister Effect Assisted Dual‐Dynamic‐Bond Cross‐Linked Organohydrogels with Enhanced Ionic Conductivity and Balanced Mechanical Properties for Flexible Sensors

For soft electronic applications, the simultaneous incorporation of conductivity and mechanical robustness remains a grand constraint, not to mention being able to operate at wide temperatures ranges. Herein, a novel conductive platform is proposed by designing skin‐inspired ionic organohydrogels ba...

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Veröffentlicht in:Advanced functional materials 2023-03, Vol.33 (12), p.n/a
Hauptverfasser: Guo, Ruyue, Bao, Yan, Zheng, Xi, Zhang, Wenbo, Liu, Chao, Chen, Jie, Xu, Jiachen, Wang, Luxuan, Ma, Jianzhong
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container_issue 12
container_start_page
container_title Advanced functional materials
container_volume 33
creator Guo, Ruyue
Bao, Yan
Zheng, Xi
Zhang, Wenbo
Liu, Chao
Chen, Jie
Xu, Jiachen
Wang, Luxuan
Ma, Jianzhong
description For soft electronic applications, the simultaneous incorporation of conductivity and mechanical robustness remains a grand constraint, not to mention being able to operate at wide temperatures ranges. Herein, a novel conductive platform is proposed by designing skin‐inspired ionic organohydrogels based on Hofmeister effect and glycerol/water system, which simultaneously realize balanced conductivity, mechanical strength, and versatile properties. The comprehensive performances are broadly and simultaneously altered via tuning the aggregation states of polymer chains by kosmotropes or chaotropes. With various ions, the conductivity and mechanical strength are continuously in situ modulated over a large window: conductivity from 0.08 to 4.8 S m−1, strength from 0.01 to 17.30 MPa, toughness from 5.4 to 9236.9 kJ m−3, and modulus from 5.1 to 2258.9 kPa. The ion transport process is inseparable from the changes of water content and pore structures caused by cross‐linking density. Meanwhile, the mechanical properties greatly depend on the densification or loosing of polymer chains and crystalline domains. Furthermore, oil/water system exhibits low temperature tolerance at ≈−65–15 °C and long‐term stability. Finally, the champion organohydrogels are applied as wearable electronic sensors and artificial skins. The mechanism proposed in this work advances the understanding of the ions contribution to organohydrogels for electronic applications. A solvent replacement strategy based on Hofmeister effect and oil‐water system is proposed for simultaneously realizing balanced conductivity, mechanical strength, and versatile properties of skin‐inspired ionic organohydrogels. The conductivity and mechanical properties are broadly and simultaneously altered by kosmotropes or chaotropes, and the mechanisms are studied in detail. Furthermore, oil‐water system endows organohydrogels with operation at wide temperatures ranges.
doi_str_mv 10.1002/adfm.202213283
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subjects Chains (polymeric)
Densification
electronic applications
Flexible components
Glycerol-Water
Hofmeister effect
Ion currents
Ion transport
ionic conductivity
Low temperature
Materials science
Mechanical properties
Moisture content
multiple physical interactions
organohydrogels
Polymers
Sensors
solvent replacement
title Hofmeister Effect Assisted Dual‐Dynamic‐Bond Cross‐Linked Organohydrogels with Enhanced Ionic Conductivity and Balanced Mechanical Properties for Flexible Sensors
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