Rapid Gelation of Tough and Anti‐Swelling Hydrogels under Mild Conditions for Underwater Communication

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(1)

Published: Nov. 4, 2022

Abstract Swelling is ubiquitous for conventional hydrogels but not favorable many situations, especially underwater applications. In this study, an anti‐swelling and mechanically robust polyacrylic acid (PAAc)/gelatin composite hydrogel reported with a rapid gelation process (10 1 s) under mild conditions via the synergy of MXene‐activated initiation zirconium ion (Zr 4+ )‐induced cross‐linking, without requirement external energy input. The MXene found efficient to activate chain initiation, while Zr prone indispensable facilitating cross‐linking formed polymer chains. resulting exhibits integration exceptional properties high mechanical performance at room temperature, thanks dense hydrogen bonds between PAAc gelatin chains that enable upper critical solution temperature above temperature. Also, desirable electrical conductivity emerges in due simultaneous contribution , allowing stable signal output gel upon deformation underwater. As demonstration, communicator by harnessing as sensing module assembled, which capable wirelessly delivering messages decoder on ground Morse codes. This study provides exemplary way tough durable

Language: Английский

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Multifunctional Organohydrogel with Ultralow‐Hysteresis, Ultrafast‐Response, and Whole‐Strain‐Range Linearity for Self‐Powered Sensors

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(15)

Published: Feb. 7, 2023

Abstract The conductive hydrogels always suffered from high internal friction, large hysteresis, and low capability of accurately predicting physical deformation, which seriously restricted their application in smart wearable devices. To address these problems, solvent molecules are directionally inserted into the polymer molecule chains via bridge effect to effectively reduce molecular friction. Moreover, swelling is also combined eliminate temporary entanglements hydrogel system. cooperation between swollen endows prepared polyacrylamide (PAM)/laponite/H 3 BO /ethylene glycol (Eg) organohydrogel (PLBOH) ultralow hysteresis (1.38%, ε = 100%), ultrafast response (≈10 ms), linearity whole‐strain‐range ( R 2 0.996) with a great sensitivity GF 2.68 at strain range 0–750%). Meanwhile, PL 10 B 30 OH exhibits long‐term stability, excellent stretchability, dissipated energy. Furthermore, assembled triboelectric nanogenerator (TENG) displays an outstanding energy harvesting performance output voltage 200 V size 20 mm × mm. sensors can monitor small facial expressions human movements, indicating tremendous applications self‐powered intelligent flexible electronics under harsh environmental conditions.

Language: Английский

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Mechanically Robust and Transparent Organohydrogel‐Based E‐Skin Nanoengineered from Natural Skin

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(15)

Published: Jan. 29, 2023

Abstract Electronic skins (e‐skins), which are mechanically compliant with human skin, regarded as ideal electronic devices for noninvasive human–machine interaction and wearable devices. In order to fully mimic e‐skins should possess reliable mechanical properties be able resist external environmental factors like heat, cold, desiccation, bacteria, while perceiving multiple stimuli, such temperature, humidity, strain. Here, a transparent, robust, environmentally stable, versatile natural skin‐derived organohydrogel (NSD‐Gel) is nanoengineered through the integration of betaine, silver nanoparticles, sodium chloride in glycerol/water binary solvent. The transparent NSD‐Gel e‐skin exhibits outstanding tensile strength (7.33 MPa), puncture resistance, moisture retention, self‐regeneration, antibacterial properties. Additionally, possesses enhanced cold/heat resistance stimuli‐responsive characteristics that effectively sense temperature humidity changes, well physiological body motion signals. vitro vivo experiments show confers desired biocompatibility tissue protective even extremely harsh environments (−196 °C 100 °C). has great potential applications multidimensional devices, human‐machine interfaces, artificial intelligence, generating platform development high‐performance on‐demand

Language: Английский

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Conductive Hydrogel for Flexible Bioelectronic Device: Current Progress and Future Perspective

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(1)

Published: Sept. 19, 2023

Abstract Conductive hydrogels (CHs) for flexible bioelectronic devices have raised great attention due to their tunable mechanical performances, adhesion, anti‐swelling, and biocompatibility. This review summarizes the current development of conductive hydrogel‐based in aspect classifications applications. Firstly, are classified into two kinds according types conductivity: ionic electronic (hydrogel based on pure materials, introducing micro/nano‐materials). Secondly, applications device, like wearable (strain sensor, body fluid detector, serviced extreme environment), tissue engineering (skin, heart, nerve, muscle), other (bionic robot, cancer treatment), highly illustrated. Finally, a depth outlook is given, which aims promote this field future.

Language: Английский

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Transparent, Ultra-Stretching, Tough, Adhesive Carboxyethyl Chitin/Polyacrylamide Hydrogel Toward High-Performance Soft Electronics

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 15(1)

Published: Dec. 7, 2022

To date, hydrogels have gained increasing attentions as a flexible conductive material in fabricating soft electronics. However, it remains big challenge to integrate multiple functions into one gel that can be used widely under various conditions. Herein, kind of multifunctional hydrogel with combination desirable characteristics, including remarkable transparency, high conductivity, ultra-stretchability, toughness, good fatigue resistance, and strong adhesive ability is presented, which was facilely fabricated through noncovalent crosslinking strategy. The resultant versatile sensors are able detect both weak large deformations, owns low detection limit 0.1% strain, stretchability up 1586%, ultrahigh sensitivity gauge factor 18.54, well wide pressure sensing range (0-600 kPa). Meanwhile, the fabrication hydrogel-based demonstrated for electronic devices, human-machine interactive system, tactile switch, an integrated skin unprecedented nonplanar visualized sensing, stretchable triboelectric nanogenerators excellent biomechanical energy harvesting ability. This work opens simple route promises practical application self-powered wearable electronics complex scenes.

Language: Английский

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Self‐Healing Hydrogel Bioelectronics

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(21)

Published: Nov. 22, 2023

Abstract Hydrogels have emerged as powerful building blocks to develop various soft bioelectronics because of their tissue‐like mechanical properties, superior bio‐compatibility, the ability conduct both electrons and ions, multiple stimuli‐responsiveness. However, hydrogels are vulnerable damage, which limits usage in developing durable hydrogel‐based bioelectronics. Self‐healing aim endow with property repairing specific functions after failure, thus improving durability, reliability, longevity. This review discusses recent advances self‐healing hydrogels, from mechanisms, material chemistry, strategies for properties improvement hydrogel materials, design, fabrication, applications bioelectronics, including wearable physical biochemical sensors, supercapacitors, flexible display devices, triboelectric nanogenerators (TENGs), implantable etc. Furthermore, persisting challenges hampering development prospects proposed. is expected expedite research

Language: Английский

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An injectable and self-healing cellulose nanofiber-reinforced alginate hydrogel for bone repair

Carbohydrate Polymers, Journal Year: 2022, Volume and Issue: 300, P. 120243 - 120243

Published: Oct. 20, 2022

Language: Английский

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Cellulosic gel-based triboelectric nanogenerators for energy harvesting and emerging applications

Nano Energy, Journal Year: 2022, Volume and Issue: 106, P. 108079 - 108079

Published: Dec. 7, 2022

Language: Английский

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Tough, Antifreezing, and Piezoelectric Organohydrogel as a Flexible Wearable Sensor for Human–Machine Interaction

ACS Nano, Journal Year: 2024, Volume and Issue: 18(4), P. 3720 - 3732

Published: Jan. 18, 2024

Piezoelectric hydrogel sensors are becoming increasingly popular for wearable sensing applications due to their high sensitivity, self-powered performance, and simple preparation process. However, conventional piezoelectric hydrogels lack antifreezing properties thus confronted with the liability of rupture in low temperatures owing use water as dispersion medium. Herein, a kind organohydrogel that integrates piezoelectricity, low-temperature tolerance, mechanical robustness, stable electrical performance is reported by using poly(vinylidene fluoride) (PVDF), acrylonitrile (AN), acrylamide (AAm),

Language: Английский

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An overview of conductive composite hydrogels for flexible electronic devices

Advanced Composites and Hybrid Materials, Journal Year: 2024, Volume and Issue: 7(2)

Published: Feb. 17, 2024

Language: Английский

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