Mechanical tough and stretchable quaternized cellulose nanofibrils/MXene conductive hydrogel for flexible strain sensor with multi-scale monitoring

Journal of Material Science and Technology, Journal Year: 2024, Volume and Issue: 191, P. 181 - 191

Published: Feb. 2, 2024

Language: Английский

---

Polydopamine-Reinforced Hemicellulose-Based Multifunctional Flexible Hydrogels for Human Movement Sensing and Self-Powered Transdermal Drug Delivery

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(4), P. 5883 - 5896

Published: Jan. 23, 2023

The preparation of bio-based hydrogels with excellent mechanical properties, stable electrochemical and self-adhesive properties remains a challenge. In this study, nano-polydopamine-reinforced hemicellulose-based typical multistage pore structures were prepared. nanocomposite exhibit show no significant crushing phenomenon after 1000 cycles cyclic compression. Its ultimate tensile strain was 101%, which is significantly higher than that native skin. shear adhesion strength the hydrogel to skin tissue reaches 7.52 kPa, better fibrin glue (Greenplast) (5 kPa), property prolongs service time in biomedicine applications. impedance reduced electrical conductivity increased addition nano-polydopamine. prepared can detect various body movements (even throat vibrations) real as motion sensor while being able rapidly load cationic drugs facilitate transdermal introduction electrically stimulated drug ions patch. It provides theoretical support for fabrication through molecular design nanoparticle reinforcement. This has important implications development next-generation flexible materials suitable health monitoring self-administration.

Language: Английский

---

A Semi‐Interpenetrating Poly(Ionic Liquid) Network‐Driven Low Hysteresis and Transparent Hydrogel as a Self‐Powered Multifunctional Sensor

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(32)

Published: May 6, 2024

Abstract Conductive hydrogels are gaining significant attention as promising candidates for the fabrication materials flexible electronics. Nevertheless, improving tensile properties, hysteresis, durability, adhesion, and electrochemical properties of these remains challenging. This work reports development a novel semi‐interpenetrating network poly(ionic liquid) hydrogel named PATV, via in situ polymerization acrylamide, N ‐[Tris(hydroxymethyl)methyl] 1‐vinyl‐3‐butylimidazolium tetrafluoroborate. The density functional theory calculations reveal that acts physical cross–linking points to construct hydrogen‐bond networks. Furthermore, networks dissipate energy efficiently quickly, thus stress concentration hysteresis avoided. prepared has low (9%), high (900%), fast response (180 ms), sensitivity (gauge factor = 10.4, pressure 0.14 kPa −1 ), wide sensing range (tensile range: 1–600%, compression 0.1–20 kPa). A multifunctional sensor designed based on enables real‐time, rapid, stable response‐ability detection human movement, facial expression recognition, pronunciation, pulse, handwriting, Morse code encryption. assembled triboelectric nanogenerator displays an excellent harvesting capability, highlighting its potential application self‐powered wearable electronic devices.

Language: Английский

---

Micelle–Micelle Cross-Linked Highly Stretchable Conductive Hydrogels for Potential Applications of Strain and Electronic Skin Sensors

Chemistry of Materials, Journal Year: 2023, Volume and Issue: 35(14), P. 5582 - 5592

Published: July 7, 2023

Wearable sensors made of flexible and stretchable hydrogels have garnered significant attention. However, their use has been limited by poor mechanical performance, such as toughness, self-recovery, a large response–recovery time. To overcome these limitations, we developed novel cross-linking agent-based hydrogel with high stretchability, antifatigue properties, good conductivity. These were introducing l-glutamic acid (LGA) into hydrophobically cross-linked polyacrylamide (PAmm) chains. In this system, LGA dynamically the micelle–micelle micelle–polymer chains greatly regulates properties hydrogels. The noncovalent synergistic interactions that came insertion enable to achieve stretchability stress values, fast self-recovery behaviors without help foreign stimuli. Additionally, LGA-based can function durable highly sensitive strain for detecting various deformations time gauge factor value. As result, capability be designed wearable are capable human joint motions, neck twisting, bending, wrist, finger, elbow movements. Similarly, monitoring different subtle motions speaking differentiating between words, swallowing, drinking through larynx vibrations. Besides ability differentiate reproduce written words reliability. LGA-regulated potential applications in electric skins, medical monitoring, soft robotics, touch panels.

Language: Английский

---

High-Saline-Enabled Hydrophobic Homogeneous Cross-Linking for Extremely Soft, Tough, and Stretchable Conductive Hydrogels as High-Sensitive Strain Sensors

ACS Nano, Journal Year: 2023, Volume and Issue: 17(22), P. 23194 - 23206

Published: Nov. 6, 2023

Design of admirable conductive hydrogels combining robust toughness, soft flexibility, desirable conductivity, and freezing resistance remains daunting challenges for meeting the customized critical demands flexible wearable electronics. Herein, a promising facile strategy to prepare tailored these anticipated is proposed, which prepared in one step by homogeneous cross-linking acrylamide using hydrophobic divinylbenzene stabilized micelles under saturated high-saline solutions. The influence environments on hydrogel topology mechanical performance investigated. suppress size cross-linkers during polymerization, weaken dynamic associations soften hydrogels. Nevertheless, cross-linked networks ensure antifracture ultralarge deformations. obtained show special extremely deformability features (Young's modulus, 5 kPa; stretchability, 10200%; 134 kJ m-2; excellent anticrack propagation). saturated-saline also endow with ion conductivity (106 mS cm-1) (<20 °C). These comprehensive properties are quite suitable electronic applications, demonstrated high sensitivity durability derived strain sensors.

Language: Английский

---

Cellulose nanocrystals boosted hydrophobically associated self-healable conductive hydrogels for the application of strain sensors and electronic devices

International Journal of Biological Macromolecules, Journal Year: 2024, Volume and Issue: 260, P. 129376 - 129376

Published: Jan. 22, 2024

Language: Английский

---

Flexible Ionic Conductive Hydrogels with Wrinkled Texture for Flexible Strain Transducer with Language Identifying Diversity

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(9), P. 4703 - 4713

Published: April 24, 2024

Conductive hydrogels have garnered significant attention in the realm of flexible electronic strain transducers (FESTs). However, development such FEST has been hindered by weak mechanical performance and low conductivity, sensitivity, stability. In this study, we introduce a novel hydrogel with wrinkled surface possessing unique ability to differentiate between different spoken written languages. Our approach involved fabricating robust, tough, ionic conductive texture through simple strategy utilizing hydrophobic initiator benzophenone (BP). BP was incorporated into hydrophobically cross-linked composed lauryl methacrylate (LMA), acrylamide (Amm), cationic monomer 2-(dimethylamino) ethyl acrylate methochloride (DMAEAMC), reinforced trimesic acid (TMA). Pluronic 123 (P123) served as source micelles, dynamically connecting polymer chains facilitating diffusion produce textured hydrogels. Furthermore, LiCl salt induced conductivity (0.18 S/m), while synergistic effect TMA enhanced electrostatic interactions DMAEAMC chains. The combination enabled stretch up 1611% high remarkable sensitivity (GF = 4.98 at 500%), wide range (0.1 500%). These are valuable candidates for integration epidermal devices. Moreover, capability monitor various large joint movements well physiological activities. Additionally, can identify languages, including English, Urdu, Pashto, respond other handwriting styles alphabets, numbers, signatures. This provides promising roadmap engineering diverse applications, especially fields sensors, skin, biomedical

Language: Английский

---

Dually-crosslinked ionic conductive hydrogels reinforced through biopolymer gellan gum for flexible sensors to monitor human activities

International Journal of Biological Macromolecules, Journal Year: 2024, Volume and Issue: 276, P. 133789 - 133789

Published: July 9, 2024

Language: Английский

---

Cellulose nanocrystals boosted hydrophobic association in dual network polymer hydrogels as advanced flexible strain sensor for human motion detection

Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials, Journal Year: 2022, Volume and Issue: 138, P. 105610 - 105610

Published: Dec. 7, 2022

Language: Английский

---

Ionic conductive hydrogels formed through hydrophobic association for flexible strain sensing

Sensors and Actuators A Physical, Journal Year: 2023, Volume and Issue: 350, P. 114148 - 114148

Published: Jan. 5, 2023

Language: Английский

---