Development of Conductive Hydrogels for Fabricating Flexible Strain Sensors

Small, Год журнала: 2021, Номер 18(5)

Опубликована: Окт. 17, 2021

Abstract Conductive hydrogels can be prepared by incorporating various conductive materials into polymeric network hydrogels. In recent years, have been developed and applied in the field of strain sensors owing to their unique properties, such as electrical conductivity, mechanical self‐healing, anti‐freezing properties. These remarkable properties allow hydrogel‐based show excellent performance for identifying external stimuli detecting human body movement, even at subzero temperatures. This review summarizes application fabrication working different modes. Finally, a brief prospectus development future is provided.

Язык: Английский

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Ionic conductive hydrogels with long-lasting antifreezing, water retention and self-regeneration abilities

Chemical Engineering Journal, Год журнала: 2021, Номер 419, С. 129478 - 129478

Опубликована: Апрель 1, 2021

Язык: Английский

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Recent Progress in Essential Functions of Soft Electronic Skin

Advanced Functional Materials, Год журнала: 2021, Номер 31(42)

Опубликована: Июль 20, 2021

Abstract Inspired by the human skin, electronic skins (e‐skins) composed of various flexible sensors, such as strain sensor, pressure shear force temperature and humility delicate circuits, are emerged to mimic sensing functions skins. In this review, strategies realize versatile functionalities natural skin‐like e‐skins, including strain‐, pressure‐, force‐, temperature‐ humility‐sensing abilities, well self‐healing ability other summarized. Some representative examples high‐performance e‐skins their applications outlined discussed. Finally, outlook future is presented.

Язык: Английский

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Injectable Self-Healing Adhesive Chitosan Hydrogel with Antioxidative, Antibacterial, and Hemostatic Activities for Rapid Hemostasis and Skin Wound Healing

ACS Applied Materials & Interfaces, Год журнала: 2022, Номер 14(30), С. 34455 - 34469

Опубликована: Июль 20, 2022

Engineered wound dressing materials with excellent injectability, self-healing ability, tissue-adhesiveness, especially the ones possessing potential therapeutic effects have great practical significance in healthcare. Herein, an injectable quaternary ammonium chitosan (QCS)/tannic acid (TA) hydrogel based on QCS and TA was designed fabricated by facile mixing of two ingredients under physiological conditions. In this system, hydrogels were mainly cross-linked dynamic ionic bonds hydrogen between TA, which endows injectable, self-healing, adhesive properties. Benefitting from inherent antioxidative, antibacterial, hemostatic abilities QCS, showed superior reactive oxygen species scavenging activity, broad-spectrum antibacterial as well rapid capability. Moreover, QCS/TA2.5 (containing 2.5% TA) exhibited biocompatibility. The vivo experiments also that not only rapidly stopped bleeding arterial deep incompressible wounds mouse tail amputation, femoral artery hemorrhage, liver incision models but significantly accelerated healing a full-thickness skin model. For potentials listed above, multifunctional offers promising network material for both hemostasis repair.

Язык: Английский

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Ultra‐Sensitive, Deformable, and Transparent Triboelectric Tactile Sensor Based on Micro‐Pyramid Patterned Ionic Hydrogel for Interactive Human–Machine Interfaces

Advanced Science, Год журнала: 2022, Номер 9(10)

Опубликована: Янв. 31, 2022

Abstract Rapid advances in wearable electronics and mechno‐sensational human–machine interfaces impose great challenges developing flexible deformable tactile sensors with high efficiency, ultra‐sensitivity, environment‐tolerance, self‐sustainability. Herein, a hydrogel sensor (THS) based on micro‐pyramid‐patterned double‐network (DN) ionic organohydrogels to detect subtle pressure changes by measuring the variations of triboelectric output signal without an external power supply is reported. By first time pyramidal‐patterned fabrication method laminated polydimethylsiloxane (PDMS) encapsulation process, self‐powered THS shows advantages remarkable flexibility, good transparency (≈85%), excellent sensing performance, including extraordinary sensitivity (45.97 mV Pa −1 ), fast response (≈20 ms), very low limit detection (50 Pa) as well stability (36 000 cycles). Moreover, LiBr immersion treatment method, possesses long‐term hyper anti‐freezing anti‐dehydrating properties, broad environmental tolerance (−20 60 °C), instantaneous peak density 20 µW cm −2 , providing reliable contact outputs different materials detecting slight human motions. integrating acquisition/process circuit, self‐power ability utilized switching button control electric appliances robotic hands simulating finger gestures, offering its potentials for multi‐functional electronic applications.

Язык: Английский

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Naturally sourced hydrogels: emerging fundamental materials for next-generation healthcare sensing

Chemical Society Reviews, Год журнала: 2023, Номер 52(9), С. 2992 - 3034

Опубликована: Янв. 1, 2023

The flourishing development of flexible healthcare sensing systems is inseparable from the fundamental materials with application-oriented mechanical and electrical properties. Thanks to continuous inspiration our Mother Nature, hydrogels originating natural biomass are attracting growing attention for their structural functional designs owing unique chemical, physical biological These highly efficient architectural enable them be most promising candidates electronic devices. This comprehensive review focuses on recent advances in naturally sourced constructing multi-functional sensors applications thereof. We first briefly introduce representative polymers, including polysaccharides, proteins, polypeptides, summarize physicochemical design principles fabrication strategies hydrogel based these polymers outlined after material properties required presented. then highlight various techniques devices, illustrate examples wearable or implantable bioelectronics pressure, strain, temperature, biomarker field systems. Finally, concluding remarks challenges prospects hydrogel-based provided. hope that this will provide valuable information next-generation build a bridge between as matter an applied target accelerate new near future.

Язык: Английский

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Multifunctional Self-Healing Dual Network Hydrogels Constructed via Host–Guest Interaction and Dynamic Covalent Bond as Wearable Strain Sensors for Monitoring Human and Organ Motions

ACS Applied Materials & Interfaces, Год журнала: 2021, Номер 13(12), С. 14612 - 14622

Опубликована: Март 16, 2021

Hydrogel-based flexible strain sensors have shown great potential in body movement tracking, early disease diagnosis, noninvasive treatment, electronic skins, and soft robotics. The good self-healing, biocompatible, sensitive stretchable properties are the focus of hydrogel-based sensors. Dual network (DN) hydrogels hopeful to fabricate self-healing with above properties. Here, multifunctional DN prepared via a combination host–guest interaction β-cyclodextrin ferrocene dynamic borate ester bonds poly(vinyl alcohol) borax. Carbon nanotubes used endow conductivity. obtained composite possess biocompatibility, stretchability (436%), fracture strength (41.0 KPa), property (healing efficiency 95%), high tensile sensitivity (gauge factor 5.9). as detect different human motions. After cutting, healed also can monitor motions stability. In addition, hydrogel may track respiratory pig lung vitro. This work exhibits new ideas approaches develop for constructing

Язык: Английский

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Highly sensitive strain sensors with wide operation range from strong MXene-composited polyvinyl alcohol/sodium carboxymethylcellulose double network hydrogel

Advanced Composites and Hybrid Materials, Год журнала: 2022, Номер 5(3), С. 1976 - 1987

Опубликована: Июль 19, 2022

Язык: Английский

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Materials with Tunable Optical Properties for Wearable Epidermal Sensing in Health Monitoring

Advanced Materials, Год журнала: 2022, Номер 34(26)

Опубликована: Март 8, 2022

Advances in wearable epidermal sensors have revolutionized the way that physiological signals are captured and measured for health monitoring. One major challenge is to convert easily readable a convenient way. possibility based on visible readouts. There range of materials whose optical properties can be tuned by parameters such as temperature, pH, light, electric fields. Herein, this review covers highlights set with tunable their integration into Specifically, recent progress, fabrication, applications these summarized discussed. Finally, challenges perspectives next generation devices proposed.

Язык: Английский

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Environment‐tolerant ionic hydrogel–elastomer hybrids with robust interfaces, high transparence, and biocompatibility for a mechanical–thermal multimode sensor

InfoMat, Год журнала: 2023, Номер 5(4)

Опубликована: Фев. 26, 2023

Abstract The human skin, an important sensory organ, responds sensitively to external stimuli under various harsh conditions. However, the simultaneous achievement of mechanical/thermal sensitivity and extreme environmental tolerance remains enormous challenge for skin‐like hydrogel‐based sensors. In this study, a novel skin‐inspired hydrogel–elastomer hybrid with sandwich structure strong interfacial bonding mechanical–thermal multimode sensing applications is developed. An inner‐layered ionic hydrogel semi‐interpenetrating network prepared using sodium carboxymethyl cellulose (CMC) as nanofiller, lithium chloride (LiCl) transport conductor, polyacrylamide (PAM) polymer matrix. outer‐layered polydimethylsiloxane (PDMS) elastomers fully encapsulating endow hybrids improved mechanical properties, intrinsic waterproofness, long‐term water retention (>98%). silane modification hydrogels imparts enhanced strength integrity. exhibit high transmittance (~91.2%), fatigue resistance, biocompatibility. multifunctional sensors assembled from realize real‐time temperature (temperature coefficient approximately −1.1% °C −1 ) responsiveness, wide‐range strain capability (gauge factor, ~3.8) over wide range (from −20°C 60°C), underwater information transmission. Notably, dual‐parameter sensor can recognize superimposed signals strain. designed prototype arrays detect magnitude spatial distribution forces temperatures. comprehensive performance via facile method superior that most similar previously reported. Finally, study develops new material platform monitoring health in environments. image

Язык: Английский

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