Ultrafast gelling using sulfonated lignin-Fe3+ chelates to produce dynamic crosslinked hydrogel/coating with charming stretchable, conductive, self-healing, and ultraviolet-blocking properties

Chemical Engineering Journal, Journal Year: 2020, Volume and Issue: 396, P. 125341 - 125341

Published: May 6, 2020

Language: Английский

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

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(9), P. 2992 - 3034

Published: Jan. 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.

Language: Английский

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Liquid Metal Supercooling for Low‐Temperature Thermoelectric Wearables

Advanced Functional Materials, Journal Year: 2019, Volume and Issue: 29(45)

Published: Sept. 6, 2019

Abstract Elastomers embedded with droplets of liquid metal (LM) alloy represent an emerging class soft multifunctional composites that have potentially transformative impact in wearable electronics, biocompatible machines, and robotics. However, for these applications it is crucial LM alloys to remain during the entire service temperature range order maintain high mechanical compliance throughout duration operation. Here, LM‐based functional do not freeze stretchable at extremely low temperatures are introduced. It shown confinement micro‐/nanometer length scales significantly suppresses their freezing (down −84.1 from −5.9 °C) melting point −25.6 +17.8 independent choice matrix material processing conditions. Such a supercooling effect allows inclusions preserve fluidic nature stretch surrounding polymer without introducing significant resistance. These results indicate highly stabilized can operate over wide open up new possibilities materials, which demonstrated self‐powered thermoelectric devices bio‐sensing personal health monitoring temperatures.

Language: Английский

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Liquid Metal–Based Soft Microfluidics

Small, Journal Year: 2019, Volume and Issue: 16(9)

Published: Oct. 1, 2019

Abstract Motivated by the increasing demand of wearable and soft electronics, liquid metal (LM)‐based microfluidics has been subjected to tremendous development in past decade, especially robotics, related fields, due unique advantages LMs that combines conductivity deformability all‐in‐one. can be integrated as core component into microfluidic systems form either droplets/marbles or composites embedded polymer materials with isotropic anisotropic distribution. The LM are found have broad applications deformable antennas, diodes, biomedical sensing chips, transient circuits, mechanically adaptive materials, etc. Herein, recent progress LM‐based their potential summarized. current challenges toward industrial future research orientation this field also summarized discussed.

Language: Английский

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Liquid metal-created macroporous composite hydrogels with self-healing ability and multiple sensations as artificial flexible sensors

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 9(2), P. 875 - 883

Published: Nov. 5, 2020

Hydrogel-based sensors have attracted significant attention owing to their promising applications in artificial intelligence. However, developing robust hydrogel conductors with customizable functionality and excellent sensor properties is challenging. In this study, a new class of sponge-like porous integrating self-healing ability, multiple sensations, mechanical proposed. These attractive comprehensive result from liquid metal-created structures. Using acrylic acid as reactive monomer, metals not only promote the formation supramolecular networks, but also enable reduction graphene oxide form electronic conductive networks create macroporous structures hydrogel. allow be used soft high compressive sensitivity (up 0.85 kPa−1), wide range strain sensitivities (more than 400%), other sensations such temperature evolution, response solvent change, sensing atmospheric negative pressure (vacuum). Furthermore, ability can further enhance durability. Such unique are expected provide novel prospects for development sophisticated flexible devices.

Language: Английский

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A self-healing electrically conductive organogel composite

Nature Electronics, Journal Year: 2023, Volume and Issue: 6(3), P. 206 - 215

Published: March 9, 2023

Language: Английский

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Multifunctional Liquid‐Free Ionic Conductive Elastomer Fabricated by Liquid Metal Induced Polymerization

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(32)

Published: June 1, 2021

Abstract Novel liquid‐free ionic conductive elastomers are fabricated by the polymerization of acrylic acid (AA) in polymerizable deep eutectic solvent (PDES). Liquid metal (LM) nanodroplets used to initiate and further cross‐link polyacrylic (PAA) chains into a polymeric network without any extra initiators cross‐linkers. The resulting exhibit high transparency (94.1%), ultra‐stretchability (2600%), autonomous self‐healing. Spin trapping electron paramagnetic resonance dye fading experiments reveal generation free radicals. UV–visible spectrometry viscosity tests demonstrate cross‐linking effect Ga 3+ . gelation time is much shorter than that conventional ammonium persulfate thermal initiation process. Furthermore, this polymer material intrinsically resistant freezing drying, enabling it operate under harsh conditions. In consideration transparency, self‐healing, ultra‐stretchability, moldability, sensory features, elastomeric conductor may hold promise for industrial applications wearable devices, force mapping, flexible electroluminescent devices.

Language: Английский

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Graphene Oxide Encapsulating Liquid Metal to Toughen Hydrogel

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(51)

Published: Sept. 17, 2021

Abstract Stretchable and tough hydrogels are highly required for various flexible devices. Liquid metal (LM) emerges as an attractive applicant in preparing functional due to its unique features. However, the high fluidity of LM incompatibility between polymer matrix make it hard fabricate hydrogels. Herein, inspired by function ligaments biological structure, graphene oxide (GO) nanosheets introduced encapsulate droplets. GO form strong interaction with both create a stable shell that prevents droplet from fracture exudation network. The LM/GO core–shell microstructure avoids phase separation produces hydrogel stress up 303 kPa at 1240% elongation. It also shows notch insensitivity adhesion surfaces. This study opens possibility using stretchable

Language: Английский

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Highly Stretchable Hydrogels as Wearable and Implantable Sensors for Recording Physiological and Brain Neural Signals

Advanced Science, Journal Year: 2022, Volume and Issue: 9(16)

Published: March 31, 2022

Recording electrophysiological information such as brain neural signals is of great importance in health monitoring and disease diagnosis. However, foreign body response performance loss over time are major challenges stemming from the chemomechanical mismatch between sensors tissues. Herein, microgels utilized large crosslinking centers hydrogel networks to modulate tradeoff modulus fatigue resistance/stretchability for producing hydrogels that closely match properties The exhibit notably different characteristics compared nanoparticles reinforced hydrogels. relatively low modulus, good stretchability, outstanding resistance. It demonstrated well suited fashioning into wearable implantable can obtain physiological pressure signals, record local field potentials rat brains, transmit through injured peripheral nerves rats. tissues, negligible response, minimal signal attenuation an extended time, successfully use long-term sensory devices. This work facilitates a deeper understanding biohybrid interfaces, while also advancing technical design concepts probes efficiently information.

Language: Английский

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Adhesive, stretchable and antibacterial hydrogel with external/self-power for flexible sensitive sensor used as human motion detection

Composites Part B Engineering, Journal Year: 2021, Volume and Issue: 220, P. 108984 - 108984

Published: May 13, 2021

Language: Английский

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