Tough double network hydrogels with rapid self-reinforcement and low hysteresis based on highly entangled networks

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Фев. 13, 2024

Abstract Most tough hydrogels are reinforced by introducing energy dissipation mechanisms, but simultaneously realizing a high toughness and low hysteresis is challenging because the structure cannot recover rapidly. In this work, mechanical performance highly entangled double network without fabricated, in which physical entanglements act as primary effective crosslinking first network. This sliding entanglement allows hydrogel to form uniform oriented during stretching, resulting tensile strength of ~3 MPa, fracture 8340 J m −2 strain-stiffening capability 47.5 90% water content. Moreover, almost 100% reversibility obtained via storage based on entropy loss. The not only overcomes typical trade-off between hydrogels, more importantly, it provides an insight into application structures high-performance hydrogels.

Язык: Английский

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A Biomimetic “Salting Out—Alignment—Locking” Tactic to Design Strong and Tough Hydrogel

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Март 22, 2024

Abstract Recently, hydrogel‐based soft materials have demonstrated huge potential in robotics, flexible electronics as well artificial skins. Although various methods are developed to prepare tough and strong hydrogels, it is still challenging simultaneously enhance the strength toughness of especially for protein‐based hydrogels. Herein, a biomimetic “salting out—alignment—locking” tactic (SALT) introduced enhancing mechanical properties through synergy alignment salting out effect. As typical example, tensile modulus initially brittle gelatin hydrogels increase 940 folds 10.12 ± 0.50 MPa 2830 34.26 3.94 MPa, respectively, increases up 1785 14.28 3.13 MJ m −3 . The obtained hold records previously reported gelatin‐based hydrogel close tendons. It further elucidated that effect engenders hydrophobic domains, while prestretching facilitates chain alignment, both synergistically contributing outstanding properties. noteworthy SALT demonstrates remarkable versatility across different salt types polymer systems, thus opening new avenues engineering strong, tough, stiff

Язык: Английский

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An overview of conductive composite hydrogels for flexible electronic devices

Advanced Composites and Hybrid Materials, Год журнала: 2024, Номер 7(2)

Опубликована: Фев. 17, 2024

Язык: Английский

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Spider-silk-inspired strong and tough hydrogel fibers with anti-freezing and water retention properties

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Май 24, 2024

Abstract Ideal hydrogel fibers with high toughness and environmental tolerance are indispensable for their long-term application in flexible electronics as actuating sensing elements. However, current exhibit poor mechanical properties instability due to intrinsically weak molecular (chain) interactions. Inspired by the multilevel adjustment of spider silk network structure ions, bionic elaborated ionic crosslinking crystalline domains constructed. Bionic show a 162.25 ± 21.99 megajoules per cubic meter, comparable that silks. The demonstrated structural engineering strategy can be generalized other polymers inorganic salts fabricating broadly tunable properties. In addition, introduction salt/glycerol/water ternary solvent during constructing structures endows anti-freezing, water retention, self-regeneration This work provides ideas fabricate stability electronics.

Язык: Английский

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Multiscale Structural Nanocellulosic Triboelectric Aerogels Induced by Hofmeister Effect

Advanced Functional Materials, Год журнала: 2023, Номер 33(42)

Опубликована: Авг. 28, 2023

Abstract The advent of self‐powered wearable electronics will revolutionize the fields smart healthcare and sports monitoring. This technological advancement necessitates more stringent design requirements for triboelectric materials. aerogels must enhance their mechanical properties to address issue structural collapse in real‐world applications. study fabricates stiff nanocellulosic with multiscale structures induced by Hofmeister effect. aggregation crystallization polymer molecular chains are enhanced effect, while ice crystal growth imparts a porous structure aerogel at micron scale. Therefore, exhibits exceptional stiffness, boasting Young's modulus up 142.9 MPa specific 340.6 kN m kg –1 , remaining undeformed even after supporting 6600 times its weight. Even withstanding an impact 343 kPa, highly robust sensors fabricated remain operational. Additionally, sensor is capable accurately detecting human movements, particularly abnormal fall postures detection. provides considerable research practical value promoting material broadening application scenarios electronics.

Язык: Английский

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Silk fibroin hydrogel adhesive enables sealed-tight reconstruction of meniscus tears

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 26, 2024

Abstract Despite orientationally variant tears of the meniscus, suture repair is current clinical gold treatment. However, inaccessible in company with re-tears susceptibility remain unresolved. To extend meniscal tools from perspective adhesion and regeneration, we design a dual functional biologic-released bioadhesive (S-PIL10) comprised methacrylated silk fibroin crosslinked phenylboronic acid-ionic liquid loading growth factor TGF-β1, which integrates chemo-mechanical restoration inner regeneration. Supramolecular interactions β-sheets hydrogen bonds richened by (PIL) result enhanced wet adhesion, swelling resistance, anti-fatigue capabilities, compared to neat gel. Besides, elimination reactive oxygen species (ROS) S-PIL10 further fortifies localized meniscus tear affecting inflammatory microenvironment dynamic borate ester bonds, continuously releases TGF-β1 for cell recruitment bridging defect edge. In vivo rabbit models functionally evidence seamless dense reconstruction torn verifying that concept adhesive feasible providing promising revolutionary strategy preclinical research tears.

Язык: Английский

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Bioinspired Ultra‐Robust Ionogels Constructed with Soft‐Rigid Confinement Space for Multimodal Monitoring Electronics

Advanced Functional Materials, Год журнала: 2023, Номер 34(6)

Опубликована: Окт. 22, 2023

Abstract Ionogels are compelling materials for flexible hybrid electronics owing to their attractive physical properties and infinite adjustability of chemical structures. However, ionogels must be sufficiently strong ensure durability, stability, a wide range strains in various applications make electronic systems mechanically compliant. Inspired by the hierarchical structure multiphase substances skin, it is fabricated several transparent (>90%) ultra‐robust (tensile strength >17 MPa, toughness >40 MJ m −3 , elongation ≈300%) via situ polymerization polymers with different binding abilities ionic liquid forming soft rigid confinement space. This strategy can also applied other liquids polymers. Furthermore, designed ionogel sensors used develop wearable intelligent health monitoring system capable health‐related physiological signals, such as temperature, body tremors, wrist pulse, breathing, gestures, predicting responding emergencies, which will pave way security technology.

Язык: Английский

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Time-Salt Type Superposition and Salt Processing of Poly(methacrylamide) Hydrogel based on Hofmeister Series

Macromolecules, Год журнала: 2024, Номер 57(6), С. 2746 - 2755

Опубликована: Фев. 22, 2024

Breakthrough to the extreme properties of polymer networks relies on new insights into their molecular dynamics. Time-salt concentration superposition has been discovered in polyelectrolyte coacervate systems, proving instrumental tuning mechanical performance hydrogels. However, time-salt type never mentioned existing literature. Herein, we reported that poly(methacrylamide) (PMAm) hydrogel can be systematically regulated a vast range by treating with different salts, for example, Young's modulus tuned from 10–2 103 MPa. The unusual behavior salt-stiffening arises salt-enhanced phase separation network and subsequent glassy transition polymer-rich phase. Rheological results demonstrate dynamic hydrogels superposed onto "time-salt type" master curves salt types aligning along Hofmeister series. shift factor exhibits correlation mobility water molecules as revealed low-field nuclear magnetic resonance spectroscopy. A polymer–water–salt ternary interaction mechanism was proposed elucidate equivalent behavior. Guided principle, processing strategy brought up expand property limits PMAm hydrogel. With simply switching employed, could either stiff wear-resistant material akin plastics or soft flowable gel utilizable recycling.

Язык: Английский

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Research progress of Zn-air batteries suitable for extreme temperatures

Energy storage materials, Год журнала: 2024, Номер 69, С. 103429 - 103429

Опубликована: Апрель 23, 2024

Язык: Английский

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Designing Ultratough Single‐Network Hydrogels with Centimeter‐Scale Fractocohesive Lengths via Inelastic Crack Blunting

Advanced Materials, Год журнала: 2024, Номер 36(23)

Опубликована: Март 7, 2024

Abstract Fractocohesive length, defined as the ratio of fracture toughness to work fracture, measures sensitivity materials in presence flaws. The larger fractocohesive more flaw‐tolerant and crack‐resistant hydrogel. For synthetic soft materials, length is short, often on scale 1 mm. Here, highly flaw‐insensitive (HFI) single‐network hydrogels containing an entangled inhomogeneous polymer network widely distributed chain lengths are designed. HFI demonstrate a centimeter‐scale 2.21 cm, which highest ever recorded for hydrogels, unprecedented ≈13 300 J m −2 . uncommon flaw insensitivity results from inelastic crack blunting inherent network. When hydrogel stretched, large number short chains break while coiled long can disentangle, unwind, straighten, producing deformation that substantially blunts tip plastic manner, thereby deconcentrating crack‐tip stresses blocking extension. design strategy applicable various such polyacrylamide poly(N,N‐dimethylacrylamide) enables development composites.

Язык: Английский

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