Low‐Hysteresis and Tough Ionogels via Low‐Energy‐Dissipating Cross‐Linking

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(44)

Published: Aug. 29, 2024

Low-hysteresis merits can help polymeric gel materials survive from consecutive loading cycles and promote life span in many burgeoning areas. However, it is a big challenge to design low-hysteresis tough materials, especially for ionogels. This be attributed the fact that higher viscosities of ionic liquids (ILs) would increase chain friction gels eventually dissipate large amounts energy under deformation. Herein, chemical ionogels proposed achieve characteristics both mechanical electric aspects via hierarchical aggregates formed by supramolecular self-assembly quadruple H-bonds soft IL-rich matrix. These self-assembled nanoaggregates not only greatly reinforce matrix enhance resilience, but also exhibit low-energy-dissipating features stress conditions, simultaneously benefiting properties. toughness subsequent anti-fatigue properties response external cyclic stimuli. More importantly, these are presented as model system elucidate underlying mechanism low hysteresis fatigue resistance. Based on findings, further demonstrated strategy universal.

Language: Английский

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Bio‐Inspired Highly Stretchable and Ultrafast Autonomous Self‐Healing Supramolecular Hydrogel for Multifunctional Durable Self‐Powered Wearable Devices

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Abstract As skin bioelectronics advances, hydrogel wearable devices have broadened perspectives in environment sensing and health monitoring. However, their application is severely hampered by poor mechanical self‐healing properties, environmental sensitivity, limited sensory functions. Herein, inspired the hierarchical structure unique cross‐linking mechanism of hagfish slime, a self‐powered supramolecular hereby reported, featuring high stretchability (>2800% strain), ultrafast autonomous capabilities (electrical healing time: 0.3 s), self‐adhesiveness (adhesion strength: 6.92 kPa), injectability, ease shaping, antimicrobial biocompatibility. It observed that embedding with highly hygroscopic salt LiCl hydrogel, not only showed excellent electrical conductivity but also presented favorable anti‐freezing water retention properties extremely cold environments natural settings. Given these attributes, served as multifunctional durable device sensitivity (gauge factor: 3.68), fast response time (160 ms), low detection limit, frequency sensitivity. Moreover, applicability this further demonstrated long‐term sensing, remote medical communication, underwater communication. Overall, findings pave way for sustainable development hydrogel‐based are self‐powered, durable, offer performance, adaptability, multi‐sensory capabilities.

Language: Английский

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Ultratransparent, stretchable, and durable electromagnetic wave absorbers

Matter, Journal Year: 2025, Volume and Issue: unknown, P. 101956 - 101956

Published: Jan. 1, 2025

Language: Английский

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Multifunctional natural starch-based hydrogels: Critical characteristics, formation mechanisms, various applications, future perspectives

Carbohydrate Polymers, Journal Year: 2025, Volume and Issue: 357, P. 123458 - 123458

Published: March 2, 2025

Language: Английский

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Polymer gels for aqueous metal batteries

Progress in Materials Science, Journal Year: 2025, Volume and Issue: unknown, P. 101426 - 101426

Published: Jan. 1, 2025

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Mechanical Regulation of Polymer Gels

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(18), P. 10435 - 10508

Published: Sept. 16, 2024

The mechanical properties of polymer gels devote to emerging devices and machines in fields such as biomedical engineering, flexible bioelectronics, biomimetic actuators, energy harvesters. Coupling network architectures interactions has been explored regulate supportive characteristics gels; however, systematic reviews correlating mechanics interaction forces at the molecular structural levels remain absent field. This review highlights engineering gel a comprehensive mechanistic understanding regulation. Molecular alters architecture manipulates functional groups/moieties level, introducing various permanent or reversible dynamic bonds dissipative energy. usually uses monomers, cross-linkers, chains, other additives. Structural utilizes casting methods, solvent phase regulation, mechanochemistry, macromolecule chemical reactions, biomanufacturing technology construct tailor topological structures, heterogeneous modulus compositions. We envision that perfect combination may provide fresh view extend exciting new perspectives this burgeoning also summarizes recent representative applications with excellent properties. Conclusions are provided from five aspects concise summary, mechanism, biofabrication upgraded applications, synergistic methodology.

Language: Английский

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Jellyfish‐inspired Polyurea Ionogel with Mechanical Robustness, Self‐Healing, and Fluorescence Enabled by Hyperbranched Cluster Aggregates

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 23, 2024

Ionogels are promising for soft iontronics, with their network structure playing a pivotal role in determining performance and potential applications. However, simultaneously achieving mechanical toughness, low hysteresis, self-healing, fluorescence using existing structures is challenging. Drawing inspiration from jellyfish, we propose novel hierarchical crosslinking design situ formation of hyperbranched cluster aggregates (HCA) to fabricate polyurea ionogels overcome these challenges. Leveraging the disparate reactivity isocyanate groups, induce HCA through competing reactions, enhancing toughness imparting clustering-triggered emission ionogel. This synergy between supramolecular interactions plasticizing effect ionic liquid leads reduced hysteresis Furthermore, incorporation NCO-terminated prepolymer dynamic oxime-urethane bonds (NPU) enables self-healing enhances stretchability. Our investigations highlight significant influence on ionogel performance, showcasing robustness including high strength (3.5 MPa), exceptional (5.5 MJ m

Language: Английский

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Scalable Layered Heterogeneous Hydrogel Fibers with Strain‐Induced Crystallization for Tough, Resilient, and Highly Conductive Soft Bioelectronics

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(48)

Published: Oct. 8, 2024

Abstract The advancement of soft bioelectronics hinges critically on the electromechanical properties hydrogels. Despite ongoing research into diverse material and structural strategies to enhance these properties, producing hydrogels that are simultaneously tough, resilient, highly conductive for long‐term, dynamic physiological monitoring remains a formidable challenge. Here, strategy utilizing scalable layered heterogeneous hydrogel fibers (LHHFs) is introduced enables synergistic modulation High toughness (1.4 MJ m −3 ) resilience (over 92% recovery from 200% strain) LHHFs achieved through damage‐free toughening mechanism involves dense long‐chain entanglements reversible strain‐induced crystallization sodium polyacrylate. unique symmetrical structure LHHFs, featuring distinct electrical mechanical functional layers, facilitates mixing multi‐walled carbon nanotubes significantly conductivity (192.7 S −1 without compromising resilience. Furthermore, high‐performance LHHF capacitive iontronic strain/pressure sensors epidermal electrodes developed, capable accurately stably capturing biomechanical bioelectrical signals human body under conditions. offers promising route developing with uniquely integrated attributes, advancing practical wearable healthcare applications.

Language: Английский

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Intrinsically Stretchable Motion Sensor Enabled by 3D Graphene Foam Integrated Hydrogel

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract Stretchable hydrogel devices are highly desirable for their capacity to seamlessly integrate significant stretchability, high conductivity, and exceptional biocompatibility. Nonetheless, the substantial disparity in stiffness between soft hydrogels commonly rigid electrode materials often leads pronounced performance fluctuations or even complete failure of sensor circuits practical applications. Here, study introduces an intrinsically stretchable graphene‐hydrogel strain (GHSS) fabricated by integrating a 3D graphene foam with very closely matched elastic moduli. The GHSS demonstrates detection limit 0.02%, rapid response time 64 ms, long‐term stability, enabling human joint movements, physiological signals, touch pad input, exercise monitoring.

Language: Английский

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Anti-freezing conductive hydrogel with exceptional mechanical properties and stable sensing performance at -30 °C

Materials Horizons, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Conductive hydrogels with stable sensing performance are highly required in soft electronic devices. However, these tend to solidify and experience structural damage at sub-zero temperatures, leading material breakdown device malfunction. The main challenge lies effectively designing the micro/nano-structure enhance mechanical properties strain while preventing freezing hydrogels. Here, we present a rapid strategy for developing MXene bridging double-network structure-based sensor using polyacrylamide agar that can maintain functionality even an extremely low temperature of -30 °C. By incorporating MXenes as catalyst expedite free radical polymerization, achieve outstanding room (a high response range 1000%, signal linearity 0.998, gauge factor (GF) value 1.41). This surpasses those reported many other Importantly, also observe micro-nanostructure hydrogel extreme approximately °C results exceptional strain-detection up 250%) 0.995 GF 1.25 due its remarkably point (<-80 °C). These findings highlight application our hydrogel-based tactile low-temperature environments.

Language: Английский

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