Trehalose-enhanced ionic conductive hydrogels with extreme stretchability, self-adhesive and anti-freezing abilities for both flexible strain sensor and all-solid-state supercapacitor

Chemical Engineering Journal, Год журнала: 2023, Номер 472, С. 144849 - 144849

Опубликована: Июль 17, 2023

Язык: Английский

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Fishing Net‐Inspired Mutiscale Ionic Organohydrogels with Outstanding Mechanical Robustness for Flexible Electronic Devices

Advanced Functional Materials, Год журнала: 2023, Номер 33(28)

Опубликована: Апрель 7, 2023

Abstract Mechanically robust and electrically conductive organohydrogels/hydrogels are increasingly required in flexible electronic devices, but it remains a challenge to achieve with integrated high performances. Herein, inspired by the geometric deformability robustness of fishing nets, multiscale ionic organohydrogels outstanding isotropic mechanical developed. The prepared introducing polyacrylamide (PAM) hydrogel, Zn 2+ binary solvent glycerol‐water into crosslinked fibrous mat which is electrospun from poly(acrylic acid) (PAA) poly(vinyl alcohol) (PVA). Because unique structure, resultant organohydrogels, being mentioned as PAA‐PVA/PAM/Zn exhibit tensile strength (9.45 MPa), stretchability, excellent anti‐fatigue property, skin‐like behaviors conductivity. Importantly, promising devices capable operating properly over wide temperature range under harsh conditions, such mechanical‐electrical signal transducing materials mechanosensors electrolytes zinc ion hybrid supercapacitors. Not only design strategy will provide clue improve properties soft materials, also offer for future devices.

Язык: Английский

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Bionic ordered structured hydrogels: structure types, design strategies, optimization mechanism of mechanical properties and applications

Materials Horizons, Год журнала: 2023, Номер 10(10), С. 4033 - 4058

Опубликована: Янв. 1, 2023

In this paper, the structure types, optimization mechanism of mechanical properties and common application scenarios bionic ordered hydrogels are reviewed.

Язык: Английский

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Phase Change Hydrogels for Bio‐Inspired Adhesion and Energy Exchange Applications

Advanced Functional Materials, Год журнала: 2023, Номер 33(27)

Опубликована: Март 23, 2023

Abstract The adhesion strategies of the gecko's toe through surface adaptation spatulas to increase contact area and snail's epiphragm via dehydration‐induced solidification lock interfaces are combined design a class adhesion‐switchable hydrogels. hydrogels made incorporating CH 3 COONa·3H 2 O salt (SA) into polyacrylamide (PAM) aqueous networks construct supersaturated stimuli‐responsive phase change materials (PAM‐SA). crystallization dramatically strengthens mechanical properties, tensile Young's moduli 340.7 0.1 MPa for crystalline C‐PAM‐SA‐120% soft PAM hydrogel. As result, PAM‐SA‐120% shows excellent adhesive performance (adhesion strength, 348 kPa) compared with hydrogel 7 kPa). stimuli‐induced from H‐PAM‐SA‐120% releases thermal controllably, which can be utilized thermochromic thermotherapy.

Язык: Английский

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Bio-inspired anisotropic hydrogels and their applications in soft actuators and robots

Matter, Год журнала: 2023, Номер 6(11), С. 3803 - 3837

Опубликована: Сен. 7, 2023

Язык: Английский

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Hofmeister Effect‐Assisted Facile One‐Pot Fabrication of Double Network Organohydrogels with Exceptional Multi‐Functions

Advanced Functional Materials, Год журнала: 2024, Номер 34(21)

Опубликована: Фев. 1, 2024

Abstract Multi‐functional hydrogels have gained attention for their potential as smart materials in diverse applications. However, most established design principles and fabrication methods are considered convoluted ineffective. Here, by using a simple one‐pot efficient method, novel PAAm/Gelatin/Ammonium sulfate organohydrogel (PGAOH) with exceptional multifunctionality, including anti‐freezing properties, excellent conductivity, remarkable stability, free‐shapeable, sensitivity, elasticity, high transparency, resistance to drying is developed. In this system, it surprisingly discovered that the presence of acrylamide molecules, gelatin can disperse well high‐concentration salting‐out solutions, significantly shorten preparation time gel, allows precise control gel volume. More importantly, form another polyacrylamide network, further enhancing mechanical properties PGAOH. Additionally, introduction glycerol notably improved environmental stability PGAOH effectively enhanced its transparency. These innovative combinations result possessing demonstrated successful application wireless virtual reality (VR) gaming device.

Язык: Английский

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Bioinspired H‐Bonding Connected Gradient Nanostructure Actuators Based on Cellulose Nanofibrils and Graphene

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 6, 2024

Abstract The construction of flexible actuators with ultra‐fast actuation and robust mechanical properties is crucial for soft robotics smart devices, but still remains a challenge. Inspired by the unique mechanism pinecones dispersing seeds in nature, hygroscopic actuator interlayer network‐bonding connected gradient structure fabricated. Unlike most conventional bilayer designs, strategy leverages biobased polyphenols to construct strong interfacial H‐bonding networks between 1D cellulose nanofibers 2D graphene oxide, endowing materials high tensile strength (172 MPa) excellent toughness (6.64 MJ m −3 ). Furthermore, significant difference hydrophilicity GO rGO, along dense H‐bonding, enables water exchange during absorption desorption processes. resulted exhibits driving speed (154° s −1 ), pressure‐resistant cyclic stability. Taking advantages these benefits, can be fabricated into devices (such as grippers, humidity control switches) potential practical applications. presented approach constructing structures instructive achieving performance functionalization biomass nanomaterials complex 1D/2D nanomaterials.

Язык: Английский

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Novel Lignin Hydrogel Sensors with Antiswelling, Antifreezing, and Anticreep Properties

ACS Sustainable Chemistry & Engineering, Год журнала: 2023, Номер 11(22), С. 8255 - 8270

Опубликована: Май 22, 2023

Hydrogel shows great potential as a flexible wearable electronic device. However, the practical application of hydrogel is still significantly limited due to poor functional stability caused by swelling behavior, non-frost resistance high water content, and obvious creep behavior under repeated external force. In this work, macromolecular lignin with three-dimensional network structure, active groups are introduced into through esterification grafting reaction methacryloyl chloride. The introduction effectively improves antiswelling, antifreezing, sensor, while maintaining mechanical properties (elongation at break > 350%, tensile strength 1.5 MPa) electrical conductivity (10 S/m). Under extreme environments, toughness, strength, elongation remain more than 96%. Furthermore, resistance, sensors not affected after immersion in for long time (72 h). This work proposes simple strategy improve anticreep hydrogels, which has guiding significance preparation high-performance materials.

Язык: Английский

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A Cellulose Salt Gel with Mechanical Transformation and Thermal Control

Advanced Functional Materials, Год журнала: 2024, Номер 34(28)

Опубликована: Март 7, 2024

Abstract Gels as compelling soft material shows its promising versatility in actuators, electronics, and biomedical sensors. However, most gel materials are too rigid to cope with long‐term changing scenarios specific needs. Inspired by the switchable behavior of bio‐behavior muscle, study reports a thermodynamically controllable stiffness‐transformative cellulose‐salt simple thermal mixing hydrous salt, cellulose nanofiber, polyacrylamide. The achieved cellulosic dynamic microstructure presents an amazing stiffness switchability between crystalline state melted states 32.38 0.02 MPa, well regulable light transmittance 41.59% 93.43%. In addition, this has excellent behavior. That is, controlling crystallization process, displays start‐stop releasing‐energy behaviors on demand. Enabled these outstanding properties, further demonstrates application soft‐rigid coupling thermoelectric device, showing broader implications for wearable electronics aiming at on‐demand work.

Язык: Английский

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Reversible Phase Change‐Induced Hardening and Softening for Conditions‐Adaptive and Mechanics‐Reconfigurable Applications

Advanced Functional Materials, Год журнала: 2024, Номер 34(18)

Опубликована: Янв. 20, 2024

Abstract The mechanical soft–hard transition of hydrogels is desired in conditions‐adaptive deformation and mechanics reconfiguration applications. However, highly efficient, stimuli‐responsive, reversible strategies are hard to achieve. Inspired by the supercooling salt‐aqueous solutions, solid supersaturated prepared based on a hydrophilic polymer network solution. inner crystallization‐ or melting‐induced phase‐change realizes switch between soft hydrogel (modulus: 0.1 MPa) rigid composite 24.0 MPa). easily deform achieve diverse new 3D models unfamiliar makes temporary shapes be efficiently fixed (hardening). Interestingly, initial hydrogel's can regenerated relying resilience polyacrylamide when crystal melted (softening). Shape memory, complex surface morphology replication, rapid mold application, self‐supporting laminated glass accomplished this unique crystallization‐melting introduced transition. This phase change soft‐hard switching strategy will broaden functionalities hydrogels.

Язык: Английский

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