Environmentally Stable, Robust, Adhesive, and Conductive Supramolecular Deep Eutectic Gels as Ultrasensitive Flexible Temperature Sensor

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: Feb. 27, 2023

Abstract It is essential and of great significance to impart high mechanical performance, environmental stability, sensitivity emerging flexible temperature sensors. In this work, polymerizable deep eutectic solvents are designed prepared by simply mixing N‐cyanomethyl acrylamide (NCMA) containing an amide group a cyano in the same side chain with lithium bis(trifluoromethane) sulfonimide (LiTFSI), obtain supramolecular polyNCMA/LiTFSI gels after polymerization. These exhibit excellent performance (tensile strength 12.9 MPa fracture energy 45.3 kJ m −2 ), strong adhesion force, high‐temperature responsiveness, self‐healing ability, shape memory behavior due reversible reconstruction ability hydrogen bonds cyano‐cyano dipole‐dipole interactions gel network. addition, also demonstrate good stability 3D printability. To verify its application potential as sensor, gel‐based wireless monitor developed displays outstanding thermal (8.4%/K) over wide detection range. The preliminary result suggests promising PNCMA pressure sensor.

Language: Английский

---

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

---

Ultrastretchable Ionogel with Extreme Environmental Resilience through Controlled Hydration Interactions

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(2)

Published: Nov. 3, 2022

Abstract Ionic conductive gels are widely sought after for applications that require reliable ionic conduction and mechanical performance under extreme conditions, which remains a grand challenge. To address this limitation, water‐induced hydration interactions deliberately controlled within the liquid (IL)‐based (ionogels) to achieve all‐round performance. Specifically, competitive between IL, water cellulose nanofibrils (CNF) balanced preserve nanoscale morphology of CNF while avoiding its dissolution. As result, both conductivity resultant ionogel synergistically enhanced. For instance, an ultra stretchable (up 10250 ± 412% stretchability) with high toughness (21.8 0.9 MJ m −3 ) (0.70 0.06 S −1 is achieved. Furthermore, multimodal sensing functions (strain, compression, temperature, humidity) realized by assembling as skin‐like membrane. Due low volatility IL strong interaction water, maintains excellent at either ultra‐low temperature (−45 °C), (75 °C) or humidity environment (RH < 15%), demonstrating superb anti‐freezing anti‐drying Overall, simple yet versatile strategy introduced leads environmentally resilient ionogels meet requirements next‐generation electroactive devices.

Language: Английский

---

Ultra‐Tough and Recyclable Ionogels Constructed by Coordinated Supramolecular Solvents

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(50)

Published: Oct. 20, 2022

The mechanical properties of most hydrogels (ionogels) are considerably affected by covalently cross-linked networks. However, the interactions between solvent/solvent molecules and solvent/polymer chains usually ignored. Herein, a series ultra-tough ionogels were prepared via supramolecular solvent, halometallate ionic liquid, in which cations coordinating anions form 3D network. linear polymer physically with solvents synergistically enhancing strength (14.3 MPa), toughness (78 MJ m-3 ), Young's modulus (55 MPa) ionogels, effectively dispersing stress concentration under load, obtaining better fatigue resistance higher fracture energy (198 kJ m-2 ). Furthermore, reversible cross-linking enables green recovery recycling simply water. This strategy shows broad applicability based on variety coordinatable polymers.

Language: Английский

---

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

---

Tough Liquid‐Free Ionic Conductive Elastomers with Robust Adhesion and Self‐Healing Properties for Ionotronic Devices

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(4)

Published: Oct. 20, 2023

Abstract Polymerizable deep eutectic solvent (PDES) as a newly emerging type of liquid‐free ionic conductive elastomer is considered to be the most attractive candidate for next generation ionotronic devices. However, it remains huge challenge integrate high conductivity, excellent mechanical properties, good self‐healing capacity, and robust adhesion into single material that satisfies stringent demand devices in various scenarios. Herein, constructed by incorporating tannic acid‐encapsulated cellulose nanocrystals (TA@CNC) multifunctional hydrogen bond donors (HBDs) along with poly(acrylic acid) choline chloride (hydrogen acceptors, HBAs) form dynamic cross‐linking network through multiple bonds. The presence rigid crystalline regions sufficient interaction sites on TA@CNC endow resultant elastomers (ACTC) superior properties (≈496 kPa, 2400%), (≈68.6 kPa), property. Benefiting from above integrated features, wearable sensors harnessing ACTC resistance sensing module provide unaltered performance under off‐axial deformation (twisting prick). Additionally, capacitance pressure sensor stability force distribution developed, opening up new avenue development

Language: Английский

---

All-in-one strain-triboelectric sensors based on environment-friendly ionic hydrogel for wearable sensing and underwater soft robotic grasping

Nano Energy, Journal Year: 2023, Volume and Issue: 111, P. 108387 - 108387

Published: March 25, 2023

Language: Английский

---

Skin-Friendly and Wearable Iontronic Touch Panel for Virtual-Real Handwriting Interaction

ACS Nano, Journal Year: 2023, Volume and Issue: 17(9), P. 8293 - 8302

Published: April 19, 2023

Touch panels are deemed as a critical platform for the future of human–computer interaction and metaverse. Recently, stretchable iontronic touch have attracted attention due to their superior adhesivity human body. However, such adhesion can not be named "real wearable", leading discomfort wearer, rashes or itching with long-time wearing. Herein, skin-friendly wearable textile-based panel highly touch-sensing resolution deformation insensitivity is designed based on an in-suit growing strategy. This endows excellent interfacial hydrophilic biocompatibility skin by overcoming bottlenecks hydrogel-based uncomfortable sticky interface low mechanical behavior. The developed enables handwriting good capacity (114 MPa), nearly 4145 times higher than pure hydrogel. More importantly, our possesses intrinsic wide external loading from silver fiber (<0.003 g) even heavy metal block (>10 kg). As proof concept, applied interaction, flexible keyboard sketchpad. qualitities helpful next-generation electronics.

Language: Английский

---

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

---

Environmentally Adaptive Polymer Hydrogels: Maintaining Wet‐Soft Features in Extreme Conditions

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(41)

Published: June 13, 2023

Abstract Hydrogels have been widely explored to adapt different application circumstances. As typical wet‐soft materials, the high‐water content of hydrogels is beneficial their wide biomedical applications. Moreover, displaying considerable potential in some high‐tech areas, like brain‐computer interface, intelligent actuator, flexible sensor, etc. However, traditional hydrogel susceptive freezing below zero, dehydration, performance swelling‐induced deformation, and suffers from mechanical damage extremely environments, which result loss peculiarities (e.g., flexibility, structure integrity, transparency), greatly limiting Therefore, reducing point, improving dehydration/solution resistance, designing adaptability are effective strategies endow with extreme environmental adaptability, thus broadening fields. This review systematically summarizes research advances environmentally adaptive (EAHs), comprising anti‐freezing, dehydration‐resistant, acid/base/swelling deformation‐resistant, environment (MEAHs). Firstly, fabrication methods presented, including deep eutectic solvent/ionic liquid substituent, addition salts, organogel, polymer network modification, double (DN) complex/nanocomposite strategy, Meanwhile, features approaches overviewed. The mechanisms, properties, applications wound dressing, sensor) EAHs demonstrated. Finally, issues future perspectives for EAHs’ researches

Language: Английский

---