Collagen-Based Organohydrogel Strain Sensor with Self-Healing and Adhesive Properties for Detecting Human Motion

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(9), P. 12350 - 12362

Published: Feb. 24, 2023

Conductive hydrogels are ideal for flexible sensors, but it is still a challenge to produce such with combined toughness, self-adhesion, self-healing, anti-freezing, moisturizing, and biocompatibility properties. Herein, inspired by natural skin, highly stretchable, strain-sensitive, multi-environmental stable collagen-based conductive organohydrogel was constructed using collagen (Col), acrylic acid, dialdehyde carboxymethyl cellulose, 1,3-propylene glycol, AlCl3. The resulting exhibited excellent tensile (strain >800%), repeatable adhesion (>10 times), self-healing [self-healing efficiency (SHE) ≈ 100%], anti-freezing (-60 °C), moisturizing (>20 d), biocompatible This also possessed good electrical conductivity (σ = 3.4 S/m) strain-sensitive properties [GF (gauge factor) 13.65 the maximal strain of 400%]. Notably, had considerable low-temperature performance (SHE 88% at -24 °C) rapid underwater property 92%, time <20 min). type sensor could not only accurately continuously monitor large-scale motions human body provide an accurate response tiny motions. work proposes development strategy multifunctional multiple environmental stability provides potential research value construction biomimetic electronic skin.

Language: Английский

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Mechanically Robust and Highly Conductive Ionogels for Soft Ionotronics

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(10)

Published: Dec. 25, 2022

Abstract Ionogels are promising materials for flexible electronics due to their continuous conductive phase, high thermal and chemical stability. However, a large amount of ionic liquid is required get conductivity, resulting in sharp decline the mechanical properties. Therefore, it great challenge prepare ionogels with both conductivity properties, which important practical applications. Herein, strength stretchability, extraordinary excellent transparency, outstanding durability, stability fabricated crosslinked polymer, liquid, lithium salt. The adoption salt can significantly improve common dilemma material science, simultaneously, address conflict between ionogels. It primarily corresponding microphase‐separation effects induced by bonds formed ions carbonyl groups on polymer networks. Ionotronics including resistance‐type sensors strain temperature sensing triboelectric nanogenerators stable output performance fabricated. Moreover, ionogel‐based microcircuit arrays resolution accuracy through digital light processing printing technology. have promise various ionotronics many fields.

Language: Английский

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Water‐Resistant Conductive Gels toward Underwater Wearable Sensing

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(42)

Published: March 1, 2023

Abstract Conductive gels are developing vigorously as superior wearable sensing materials due to their intrinsic conductivity, softness, stretchability, and biocompatibility, showing a great potential in many aspects of lives. However, compared wide application on land, it is significant yet rather challenging for traditional conductive realize under water. The swelling the loss components aqueous environment, resulted from diffusion across interface, lead structural instability performance decline. Fortunately, efforts devoted improving water resistance employing them field underwater recent years, some exciting achievements obtained, which significance promoting safety efficiency activities. there no review thoroughly summarize gels. This presents brief overview representative design strategies water‐resistant diversified applications sensors. Finally, ongoing challenges further also discussed along with recommendations future.

Language: Английский

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High‐Performance Strain Sensors Based on Organohydrogel Microsphere Film for Wearable Human–Computer Interfacing

Advanced Science, Journal Year: 2022, Volume and Issue: 10(6)

Published: Dec. 23, 2022

Stretchable hydrogel-based strain sensors suffer from limited sensitivity, which urgently requires further breakthroughs for precise and stable human-computer interaction. Here, an efficient microstructural engineering strategy is proposed to significantly enhance the sensitivity of by sandwiching emulsion-polymerized polyacrylamide organohydrogel microsphere membrane between two Ecoflex films, are accompanied crack generation propagation effects upon stretching. Consequently, as-developed sensor exhibits ultrahigh (gauge factor (GF) 1275), wide detection range (100% strain), low hysteresis, ultralow limit (0.05% good fatigue resistance, fabrication cost. In addition, features water, dehydration, frost enabling real-time monitoring in various complex conditions due encapsulation film addition glycerol KCl. Through structural manipulation, device achieves superior response tiny strains, with a GF value 98.3 less than 1.5%. Owing high sensing performance, able detect human activities swallowing finger bending even under water. On this basis, wireless system apnea warning single-channel gesture recognition capabilities successfully demonstrated, demonstrating its great promise as wearable electronics.

Language: Английский

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Biomimetic Chromotropic Photonic‐Ionic Skin with Robust Resilience, Adhesion, and Stability

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(33)

Published: June 1, 2022

Abstract The growing interest in mimicry of biological skins greatly promotes the birth high‐performance artificial skins. Chameleon can actively transform environmental information into bioelectrical and color‐change signals simultaneously through manipulating ion transduction photonic nanostructures. Here, inspired by chameleon skins, a novel biomimetic chromotropic photonic‐ionic skin (PI‐skin) capable outputting synergistic electrical optical under strain with robust adhesion, stability, resilience is ingeniously constructed. PI‐skin exhibits sensitive structural color change synchronized response via adjusting lattice spacing crystal (mechanochromic sensitivity: 1.89 nm per %, Δ λ > 150 nm). Notably, polyzwitterionic network provides abundant electrostatic interactions, endowing excellent tolerance, outstanding mechanical stability ( 10 000 continuous cycles). Meanwhile, high loading ionic liquid (IL) weakens interaction between molecular chains, leading to resilience. finally applied construct visually interactive wearable device, realizing precise human motion monitoring, remote communication, visual localization pressure distribution. This work not only expands design ideas for construction advanced I‐skins but also general platform high‐level devices smart electronics.

Language: Английский

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Tough, Anti-Swelling Supramolecular Hydrogels Mediated by Surfactant–Polymer Interactions for Underwater Sensors

ACS Applied Materials & Interfaces, Journal Year: 2022, Volume and Issue: 14(26), P. 30385 - 30397

Published: June 23, 2022

It is a great challenge for traditional hydrogel-based sensors to be effective underwater due unsatisfactory water resistance and insufficient wet adhesion. Herein, tough supramolecular hydrogel aiming at sensing prepared by the modification of hydrophilic poly(acrylic acid) (PAA) with small amount hydrophobic lauryl methacrylate (LMA) in presence high concentrations cationic surfactant cetyltrimethylammonium bromide (CTAB). Owing synergistic effects electrostatic interactions associations CTAB P(AA-co-LMA) copolymer, content approximately 58.5 wt % demonstrates outstanding anti-swelling feature, superior tensile strength (≈1.6 MPa), large stretchability (>900%), rapid room-temperature self-recovery (≈3 min 100% strain), robust adhesion diverse substrates. Moreover, strain sensor based on displays keen sensitivity range 0-900% (gauge factor 0.42, 3.44, 5.44, 7.39 0-100, 100-300, 300-500, 500-900%, respectively) pronounced stability both air underwater. Additionally, can easily recycled dissolving anhydrous ethanol. This work provides facile strategy fabricate eco-friendly, hydrogels sensing.

Language: Английский

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Multiple hydrogen bonds reinforced conductive hydrogels with robust elasticity and ultra-durability as multifunctional ionic skins

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 451, P. 138525 - 138525

Published: Aug. 8, 2022

Language: Английский

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Hydrophobic and Stable Graphene-Modified Organohydrogel Based Sensitive, Stretchable, and Self-Healable Strain Sensors for Human-Motion Detection in Various Scenarios

ACS Materials Letters, Journal Year: 2022, Volume and Issue: 4(9), P. 1616 - 1629

Published: July 27, 2022

Developing stretchable/wearable strain sensors in different application scenarios is a global demand for creating smart society and promoting healthcare, whereas existing hydrogel-based suffer from limited sensitivity, low conductance hydrophilicity, making them difficult to operate underwater. In this work, highly sensitive, stretchable, hydrophobic sensor fabricated by coating layer of reduced graphene oxide (rGO) sheets on the surface organohydrogel. Furthermore, facile solvent-replacement approach utilized enhance anti-freezing anti-drying abilities hydrogel simultaneously incorporating propanediol solvent. Consequently, obtained rGO-organohydrogel composite features high gauge factor 140, detection limit 0.1% strain, wide range (0–400% strain), fast response time 190 ms, excellent stability repeatability, hydrophobicity (contact angle 122°), it applicable scenarios, such as real-time continuous monitoring various human motions extremely cold (−60 °C), dry, underwater environments. The sensitivity an rGO-modified organohydrogel more than 30 times higher that its unmodified counterpart, which attributed cracking tunneling effects introduced conductive rGO upon stretching.

Language: Английский

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Gel-based strain/pressure sensors for underwater sensing: Sensing mechanisms, design strategies and applications

Composites Part B Engineering, Journal Year: 2023, Volume and Issue: 255, P. 110631 - 110631

Published: Feb. 21, 2023

Language: Английский

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Synergetic Lithium and Hydrogen Bonds Endow Liquid‐Free Photonic Ionic Elastomer with Mechanical Robustness and Electrical/Optical Dual‐Output

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(20)

Published: March 6, 2023

Photonic ionic elastomers (PIEs) capable of multiple signal outputs are intriguing in flexible interactive electronics. However, fabricating PIEs with simultaneous mechanical robustness, good conductivity, and brilliant structure color still remains challenging. Here, the limitations broken through introducing synergistic effect lithium hydrogen bonds into an elastomer. In virtue bonding between ions carbonyl groups polymer matrix as well silanol on surface silica nanoparticles (SiNPs) ether along chains, demonstrate strength up to 4.3 MPa toughness 8.6 MJ m-3 . Meanwhile, synchronous electrical optical output under strains can be achieved presence dissociated contributed by bond non-close-packed SiNPs stabilized bond. Moreover, due their liquid-free nature, exhibit extraordinary stability durability, which withstand extreme conditions including both high low temperatures humidity. This work provides a promising molecular engineering route construct high-performance photonic conductors toward advanced ionotronic applications.

Language: Английский

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