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

---

Multiple-Language-Responsive Conductive Hydrogel Composites for Flexible Strain and Epidermis Sensors

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(7), P. 4233 - 4243

Published: March 22, 2024

Conductive hydrogels are considered highly promising materials for developing skin-like sensors due to their excellent biocompatibility and mechanical flexibility. However, limited stretchability, low toughness, fatigue resistance hinder sensing capabilities durability. To overcome these limitations, we developed a conductive hydrogel composite with high performance the ability respond identify different languages. The prepared by incorporating functionalized multiwalled carbon tubes (F-CNTs) into hydrophobically associated polyacrylamide (AM) lauryl methacrylate (Lmc) hydrogels. ensure uniform dispersion of F-CNTs in network, cationic surfactant cetyldimethylethylammonium bromide (CDAB) is used; carboxylic group on cross-links micelles polymer chains through electrostatic interactions. also facilitates formation hydrophobic interactions between matrix F-CNT surface. This greatly improves properties hydrogel, resulting stretchability 2016%, toughness 551.56 kJ m–3, an antifatigue property. exhibits tensile strain sensitivity gauge factor 4.69 at 600% strain. hybrid hydrogel-based demonstrate capabilities, not only detecting full-range human activities but differentiating languages (English, Urdu, Pushto) both speaking writing. Besides sensing, has capability mimic skin touchable screen like metal. These results highlight potential F-CNT-based as wearable sensor flexible devices.

Language: Английский

---

Durability against folded test of SR/CNT/SR flexible strain sensors for human therapy motion monitoring

Sensors and Actuators A Physical, Journal Year: 2025, Volume and Issue: unknown, P. 116397 - 116397

Published: Feb. 1, 2025

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

---

Mechanical robust and highly conductive composite hydrogel reinforced by a combination of cellulose nanofibrils/polypyrrole toward high-performance strain sensor

Composites Part B Engineering, Journal Year: 2023, Volume and Issue: 266, P. 111022 - 111022

Published: Sept. 24, 2023

Language: Английский

---

Guar gum reinforced conductive hydrogel for strain sensing and electronic devices

International Journal of Biological Macromolecules, Journal Year: 2023, Volume and Issue: 246, P. 125666 - 125666

Published: July 3, 2023

Language: Английский

---

6-amino caproic acid regulated mechanical performance of ionically conductive ultra-stretchable hydrogels for flexible strain and epidermis sensors

Sensors and Actuators A Physical, Journal Year: 2023, Volume and Issue: 356, P. 114363 - 114363

Published: April 11, 2023

Language: Английский

---

Hydrophobically associated ionic conductive hydrogels as strain, pressure, and an electronic sensor for human motions detection

Sensors and Actuators A Physical, Journal Year: 2023, Volume and Issue: 362, P. 114618 - 114618

Published: Aug. 25, 2023

Language: Английский

---

Transparent, High Stretchable, Environmental Tolerance, and Excellent Sensitivity Hydrogel for Flexible Sensors and Capacitive Pens

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(37), P. 44280 - 44293

Published: Sept. 12, 2023

The prospect of ionic conductive hydrogels in multifunctional sensors has generated widespread scientific interest. new generation flexible materials should be combined with superior mechanical properties, high conductivity, transparency, sensitivity, good self-restoring fatigue and other characteristics, while the current are difficult to meet these requirements. Herein, we prepared poly(acrylamide-acrylic acid) (P(AM-AA))/gelatin/glycerol-Al3+ (PG1G2A) conducting hydrogel by one-pot polymerization under UV light. PG1G2A had tensile strength (539.18 kPa), excellent property (1412.96%), fast self-recovery resistance, transparency (>80%), moisturizing, antifreezing/drying properties. In addition, hydrogel-based strain sensor can respond stimulation generate accurate, stable, recyclable electrical signals, sensitivity (GF 5.81). could used as wearable devices for monitoring multiple subtle movements different body parts at temperatures. Interestingly, capacitive pen embedded mold write draw on screen a phone or tablet. This shows broad application prospects E-skin, motion monitoring, human-computer interaction extreme environments.

Language: Английский

---