Stratum Corneum‐Inspired Zwitterionic Hydrogels with Intrinsic Water Retention and Anti‐Freezing Properties for Intelligent Flexible Sensors

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

Published: March 3, 2025

Abstract Hydrogels, which mimic the properties of natural tissues, are essential for flexible electronics in human‐machine interfaces (HMIs). However, traditional hydrogels suffer from dehydration, compromising stability and functionality. To address this issue, a stratum corneum‐inspired, water‐retaining hydrogel is developed using hygroscopic polymers bound water. Three types hydrophilic monomers (non‐ionic, mono‐ionic, zwitterionic) explored, with polyzwitterions, particularly N,N‐dimethyl (acrylamidopropyl) ammonium propane sulfonate (DMAAPS), forming quasi‐hydrogel that retains softness flexibility conventional hydrogels. Water acts as plasticizer, enhancing polymer chain mobility reducing stiffness. The DMAAPS maintains 100% weight retention under specific humidity conditions shows skin‐like across wide range. Young's modulus increases 54 to 118 kPa relative decreases 80% 40%. absence free water confers intrinsic anti‐freezing properties. A triple crosslinking mechanism conductive endow stretchability (> 2000%), toughness, elasticity, self‐healing, stable sensing capabilities. functions an excellent sensor real‐time, sensitive detection human motion physiological signals. An intelligent handwriting recognition platform high accuracy also established double‐channel signal collection machine learning algorithms, offering insights next‐generation durable, biomimetic, smart HMIs.

Language: Английский

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Thermal-Sensitive Artificial Ionic Skin with Environmental Stability and Self-Healing Property

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(6), P. 9115 - 9124

Published: Jan. 30, 2025

Wearable temperature-sensitive electronic skin enables robots to rapidly detect environmental changes and respond intelligently, thereby reducing temperature-related mechanical failures. Additionally, this can measure record the temperature of external objects, broadening its potential applications in medical field. In study, we designed a thermally sensitive artificial ionic using liquids (ILs) as solvents carbon nanotubes (CNTs) conductive fillers. The incorporation ILs into polymer network enhances thermal stability, while CNTs establish dual conduction pathways (CNTs-CNTs CNTs-polymer chain segments), leading rapid response times only 16 s. initiation IL dissociation at elevated temperatures boosts carrier density, resulting substantial improvement sensitivity (5%/°C). Furthermore, displays remarkable self-healing properties (90%), extending lifespan practical applications. This kind stably sense wearer's body provide an ideal long-term stable new functional material for development human such robots.

Language: Английский

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Bionic Hydrogel-based Stretchable Devices for Bioelectronics Applications

Journal of Bionic Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Language: Английский

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Multifunctional hydrogel enabled by tannin derived nanoparticles system for the application of strain sensing and human machine interfaces

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2025, Volume and Issue: unknown, P. 136367 - 136367

Published: Feb. 1, 2025

Language: Английский

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