A fully hydrophobic ionogel enables highly efficient wearable underwater sensors and communicators

Materials Horizons, Год журнала: 2021, Номер 8(10), С. 2761 - 2770

Опубликована: Янв. 1, 2021

Underwater sensing has extraordinary significance in ocean exploration (e.g., marine resources development, biology research, and environment reconnaissance), but the great difference between land seriously prevents current traditional sensors from being applied underwater sensing. Herein, we reported a fully hydrophobic ionogel with long-term adhesion stability as highly efficient wearable sensor that displays an excellent performance, including high sensitivity, rapid responsiveness superior durability. Of greater significance, showed tremendous potential applications for communication, posture monitoring biological research.

Язык: Английский

---

Stretchable Unsymmetrical Piezoelectric BaTiO₃ Composite Hydrogel for Triboelectric Nanogenerators and Multimodal Sensors

ACS Nano, Год журнала: 2022, Номер 16(1), С. 1661 - 1670

Опубликована: Янв. 11, 2022

Improving output performance of triboelectric nanogenerators (TENGs) is crucial for expanding their applications in smart devices, especially flexible and wearable bioelectronics. In this study, we design fabricate a flexible, stretchable, highly transparent TENG based on an unsymmetrical PAM/BTO composite film, made polyacrylamide (PAM) hydrogel BaTiO3 nanocubes (BTO NCs, BTO), the can be tailored by adjusting amount distribution location BTO. The stretchable electrode could bear over 8 times stretching. By changing content BTO fabricated TENGs improved, acting as pressure sensors with high sensitivity to distinguish spectrum forces (0.25-6 N) at low frequency. mechanism enhanced hydrogel-based discussed detail. integrating piezoresistive, piezoelectric, effects, optimized piezoresistive are used multimodal biomechanical detecting motions human bodies, pressure, curvature sensitivity.

Язык: Английский

---

Naturally sourced hydrogels: emerging fundamental materials for next-generation healthcare sensing

Chemical Society Reviews, Год журнала: 2023, Номер 52(9), С. 2992 - 3034

Опубликована: Янв. 1, 2023

The flourishing development of flexible healthcare sensing systems is inseparable from the fundamental materials with application-oriented mechanical and electrical properties. Thanks to continuous inspiration our Mother Nature, hydrogels originating natural biomass are attracting growing attention for their structural functional designs owing unique chemical, physical biological These highly efficient architectural enable them be most promising candidates electronic devices. This comprehensive review focuses on recent advances in naturally sourced constructing multi-functional sensors applications thereof. We first briefly introduce representative polymers, including polysaccharides, proteins, polypeptides, summarize physicochemical design principles fabrication strategies hydrogel based these polymers outlined after material properties required presented. then highlight various techniques devices, illustrate examples wearable or implantable bioelectronics pressure, strain, temperature, biomarker field systems. Finally, concluding remarks challenges prospects hydrogel-based provided. hope that this will provide valuable information next-generation build a bridge between as matter an applied target accelerate new near future.

Язык: Английский

---

Self-adhesive, self-healing, biocompatible and conductive polyacrylamide nanocomposite hydrogels for reliable strain and pressure sensors

Nano Energy, Год журнала: 2023, Номер 109, С. 108324 - 108324

Опубликована: Март 2, 2023

Язык: Английский

---

Tannic acid: a versatile polyphenol for design of biomedical hydrogels

Journal of Materials Chemistry B, Год журнала: 2022, Номер 10(31), С. 5873 - 5912

Опубликована: Янв. 1, 2022

Tannic acid (TA), a natural polyphenol, is hydrolysable amphiphilic tannin derivative of gallic with several galloyl groups in its structure. interacts various organic, inorganic, hydrophilic, and hydrophobic materials such as proteins polysaccharides via hydrogen bonding, electrostatic, coordinative interactions. has been studied for biomedical applications crosslinker anti-inflammatory, antibacterial, anticancer activities. In this review, we focus on TA-based hydrogels biomaterials engineering to help scientists engineers better realize TA's potential the design fabrication novel hydrogel biomaterials. The interactions TA or synthetic compounds are deliberated, discussing parameters that affect TA-material thus providing fundamental set criteria utilizing tissue healing regeneration. review also discusses merits demerits using developing either through direct incorporation formulation indirectly immersing final product solution. general, bioactive molecule diverse hydrogels.

Язык: Английский

---

Ultrafast Fabrication of Lignin-Encapsulated Silica Nanoparticles Reinforced Conductive Hydrogels with High Elasticity and Self-Adhesion for Strain Sensors

Chemistry of Materials, Год журнала: 2022, Номер 34(11), С. 5258 - 5272

Опубликована: Июнь 2, 2022

Conductive hydrogels are receiving considerable attention because of their important applications, such as flexible wearable electronic, human-machine interfaces, and smart/soft robotics. However, the insufficient mechanical performance inferior adhesive capability severely hinder potential applications in an emerging field. Herein, a highly elastic conductive hydrogel that integrated robustness, self-adhesiveness, UV-filtering, stable electrical was achieved by synergistic effect sulfonated lignin-coated silica nanoparticles (LSNs), polyacrylamide (PAM) chains, ferric ions (Fe3+). In detail, dynamic redox reaction constructed between catechol groups LSNs Fe3+, which could promote rapid gelation acrylamide (AM) monomers 60 s. The optimized containing 1.5 wt % junction points exhibited excellent elasticity (<15% hysteresis ratio), high stretchability (∼1100% elongation), improved robustness (tensile compressive strength ∼180 kPa ∼480 kPa). Notably, abundant endowed with long-lasting robust self-adhesion, enabling seamless adhesion to human skin. Meanwhile, also provided exceptional UV-blocking (∼95.1%) for hydrogels. combined advantages were manifested sensors high-fidelity detection various deformations over wide range strain (10–200%) good repeatability stability. We believed designed may become promising candidate material future electronics long-term movements monitoring.

Язык: Английский

---

Temperature-Responsive Ionic Conductive Hydrogel for Strain and Temperature Sensors

ACS Applied Materials & Interfaces, Год журнала: 2022, Номер 14(23), С. 26536 - 26547

Опубликована: Июнь 3, 2022

Flexible wearable devices have achieved remarkable applications in health monitoring because of the advantages multisignal collecting and real-time wireless transmission information. However, integration bulky sensing elements rigid metal circuit components traditional may lead to a mechanical signal-conducting mismatch between biological tissues, thus restricting their wide human body. The excellent properties, conductivity, high tissue resemblance conductive hydrogel contribute its application flexible electronic sensors monitor health. In this work, dual-network, temperature-responsive ionic with stretchability, fast temperature responsiveness, good conductivity was developed by introducing polyvinylpyrrolidone (PVP)/ tannic acid (TA)/ Fe3+ cross-linked network into N,N-methylene diacrylamide (MBAA) poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAAm-co-AM)) network. Furthermore, introduction PVP/TA/Fe3+ endowed stretchability conductivity. By adjusting molar ratio TA 3:5, maximal stretching 720% sensitive strain response (GF = 3.61) achieved, showing promising both large fine motions. Moreover, PNIPAAm lower critical solution (LCST), be used environmental through temperature–conductivity which can applied as sensor detect fever or hyperthermia

Язык: Английский

---

Toughening Double‐Network Hydrogels by Polyelectrolytes

Advanced Materials, Год журнала: 2023, Номер 35(26)

Опубликована: Март 20, 2023

The Hoffmeister effect of inorganic salts is verified as a promising way to toughen hydrogels, however, the high concentration may be accompanied by poor biocompatibility. In this work, it found that polyelectrolytes can obviously elevate mechanical performances hydrogels through effect. introduction anionic poly(sodium acrylate) into poly(vinyl alcohol) (PVA) hydrogel induces aggregation and crystallization PVA boost properties resulting double-network hydrogel: elevation 73, 64, 28, 135, 19 times in tensile strength, compressive Young's modulus, toughness, fracture energy compared with poly(acrylic acid), respectively. It noteworthy flexibly tuned variation polyelectrolyte concentration, ionization degree, relative hydrophobicity ionic component, type wide range. This strategy work for other Hoffmeister-effect-sensitive polymers polyelectrolytes. Also, urea bonds further improve antiswelling capability hydrogels. As biomedical patch, advanced efficiently inhibit hernia formation promote regeneration soft tissues an abdominal wall defect model.

Язык: Английский

---

Ultrastretchable Ionogel with Extreme Environmental Resilience through Controlled Hydration Interactions

Advanced Functional Materials, Год журнала: 2022, Номер 33(2)

Опубликована: Ноя. 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.

Язык: Английский

---

Highly Stretchable Hydrogels as Wearable and Implantable Sensors for Recording Physiological and Brain Neural Signals

Advanced Science, Год журнала: 2022, Номер 9(16)

Опубликована: Март 31, 2022

Recording electrophysiological information such as brain neural signals is of great importance in health monitoring and disease diagnosis. However, foreign body response performance loss over time are major challenges stemming from the chemomechanical mismatch between sensors tissues. Herein, microgels utilized large crosslinking centers hydrogel networks to modulate tradeoff modulus fatigue resistance/stretchability for producing hydrogels that closely match properties The exhibit notably different characteristics compared nanoparticles reinforced hydrogels. relatively low modulus, good stretchability, outstanding resistance. It demonstrated well suited fashioning into wearable implantable can obtain physiological pressure signals, record local field potentials rat brains, transmit through injured peripheral nerves rats. tissues, negligible response, minimal signal attenuation an extended time, successfully use long-term sensory devices. This work facilitates a deeper understanding biohybrid interfaces, while also advancing technical design concepts probes efficiently information.

Язык: Английский

---