High‐Conductivity, Self‐Healing, and Adhesive Ionic Hydrogels for Health Monitoring and Human‐Machine Interactions Under Extreme Cold Conditions

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract Ionic conductive hydrogels (ICHs) are emerging as key materials for advanced human‐machine interactions and health monitoring systems due to their unique combination of flexibility, biocompatibility, electrical conductivity. However, a major challenge remains in developing ICHs that simultaneously exhibit high ionic conductivity, self‐healing, strong adhesion, particularly under extreme low‐temperature conditions. In this study, novel ICH composed sulfobetaine methacrylate, methacrylic acid, TEMPO‐oxidized cellulose nanofibers, sodium alginate, lithium chloride is presented. The hydrogel designed with hydrogen‐bonded chemically crosslinked network, achieving excellent conductivity (0.49 ± 0.05 S m −1 ), adhesion (36.73 2.28 kPa), self‐healing capacity even at −80 °C. Furthermore, the maintain functionality over 45 days, showcasing outstanding anti‐freezing properties. This material demonstrates significant potential non‐invasive, continuous monitoring, adhering conformally skin without signal crosstalk, enabling real‐time, high‐fidelity transmission cryogenic These offer transformative next generation multimodal sensors, broadening application possibilities harsh environments, including weather outer space.

Language: Английский

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Recyclable Dynamic Hydrogen Bonding and Disulfide Based Polymer‐Silver Nanoparticle Hybrid Triboelectric Nanogenerator for Artificial Intelligence‐Assisted High‐Precision Smart Insoles

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Abstract With rapid advancement in the field of smart technology, reshapeable devices have garnered widespread interest. Liquid‐free flexible materials eliminate risk leakage thus enhancing user safety along with being recyclable. However, poor network fluidity and difficulty fully disconnecting cross‐links limited its potential as a device. In this work, silver nanoparticles (AgNPs) are doped into physically cross‐linked dynamic linear polydimethylsiloxane (PIAU) to develop closed‐loop recyclable high‐dielectric nanocomposite. This nanocomposite exhibits moderate elastoviscosity‐transition temperature spatial remodelability based on multiple types reversible hydrogen bonds S─Ag bonds. AgNPs sprayed surface form conductive coating stabilized by at polymer‐nano interface. Based refined assembly, an antibacterial triboelectric nanogenerator (TENG) is developed applied high‐precision insole. The insole 16 TENG sensors, resulting simplified system that employs machine learning (ML) for personalized motion monitoring, including recognition gait classification. Five algorithm models ensure high accuracy enable it further expand abnormal alarm system. work presents new reliable environmentally friendly strategy design high‐performance sustainable devices.

Language: Английский

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Antifreezing, Water Retention, and High‐Stretch Ionic Conductive Hydrogels for Winter Motion Sensing

Journal of Applied Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

ABSTRACT Conductive hydrogels are promising for flexible electronic device applications, where strain change is converted to electrical signal responses. However, most reported conductive typically frozen around 0°C and dried out limiting their potential applications. Herein, a highly stretchable ionic hydrogel (ICH) with antifreezing water retention properties was prepared using natural polymer‐based (sodium alginate‐co‐polyacrylamide) as the matrix material. By introducing hydrated salt CaCl 2 ethylene glycol via solvent displacement method, ICH exhibits high conductivity (0.91S/m at 20°C), transparency (95%), (−43°C). Moreover, optimized achieves satisfactory sensitivity toward tension (gauge factor = 2.58 100% strain). Interestingly, real‐time sensing system wearable motion based on resulting well developed by integrating wireless transmission platform. It anticipated that such an will significantly broaden opportunities sensor

Language: Английский

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Stretchable, Antifreeze, and Water-Retaining Silk Fibroin-Based Ionic Conductive Hydrogel for Wearable Sensors

ACS Applied Electronic Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Language: Английский

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