Highly Tough Bioinspired Ternary Hydrogels Synergistically Reinforced by Graphene/Xonotlite Network

Li, Sen; Qin, Haili; Zhang, Tan; Cong, Huai‐Ping; Yu, Shu‐Hong

doi:10.1002/smll.201800673

Cited by 14 publications

(9 citation statements)

References 37 publications

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“…Meanwhile, the double-network hydrogel was composed of two networks with chemical interactions, entanglements, and interactions. It is a tightly cross-linked, rigid, and brittle network, as well as a loosely cross-linked soft and tough network [17][18][19]. The PAM-PVA hydrogels were synthesized by the polymerization of acrylamide (AM), N, N -methylenebisacrylamide (BIS), ammonium persulfate (APS), polyvinyl alcohol (PVA), and glycerol, which were employed as monomer, cross-linker, and initiator, respectively, as shown in Figure 1d.…”

Section: Synthesis and Characterization Of Pam-pva Hydrogelmentioning

confidence: 99%

Double-Network Hydrogel for Stretchable Triboelectric Nanogenerator and Integrated Electroluminescent Skin with Self-Powered Rapid Visual Sensing

Sun

Zhang

et al. 2022

Electronics

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Bio-inspired design plays a very significant role in adapting biological models to technical applications of flexible electronics. The flexible, stretchable, and portable electrode is one of the key technical challenges in the field. Inspired by the responses to mechanical stimuli of natural plants, we designed a highly transparent (over 95%), stretchable (over 1500%), and biocompatible electrode material by using polymerized double-network hydrogel for fabricating a triboelectric nanogenerator (SH-TENG). The SH-TENG can convert tiny mechanical stretching from human movements directly into electrical energy, and is capable of lighting up to 50 LEDs. Benefiting from bio-inspired design, the coplanar, non-overlapping electrode structure breaks through the limitations of conventional electrodes in wearable devices and overcomes the bottleneck of transparent materials. Furthermore, a self-powered raindrop visual sensing system was realized, which can perform quasi-real-time rainfall information monitoring and increase rainfall recognition ability of vehicle automatic driving systems. This study provides a novel strategy for making next-generation stretchable electronic devices and flexible visual sensing systems.

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Section: Synthesis and Characterization Of Pam-pva Hydrogelmentioning

confidence: 99%

Double-Network Hydrogel for Stretchable Triboelectric Nanogenerator and Integrated Electroluminescent Skin with Self-Powered Rapid Visual Sensing

Sun

Zhang

et al. 2022

Electronics

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“…As the new generation of high-performance conductive elastomers, conductive hydrogel is widely used in sports monitoring, healthcare, electronic skins, energy storage devices, and other fields [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. However, due to the single and loose gel network of traditional synthetic hydrogels and the lack of efficient energy dissipation between the molecular chains, they often exhibit brittle and weak mechanical properties under external forces [ 8 , 9 ], which greatly limits their application development. Researchers have taken great efforts in improving the mechanical performances of conductive hydrogels.…”

Section: Introductionmentioning

confidence: 99%

A Bilayer Skin-Inspired Hydrogel with Strong Bonding Interface

Yang

Cui

et al. 2022

Nanomaterials

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Conductive hydrogels are widely used in sports monitoring, healthcare, energy storage, and other fields, due to their excellent physical and chemical properties. However, synthesizing a hydrogel with synergistically good mechanical and electrical properties is still challenging. Current fabrication strategies are mainly focused on the polymerization of hydrogels with a single component, with less emphasis on combining and matching different conductive hydrogels. Inspired by the gradient modulus structures of the human skin, we propose a bilayer structure of conductive hydrogels, composed of a spray-coated poly(3,4-dihydrothieno-1,4-dioxin): poly(styrene sulfonate) (PEDOT:PSS) as the bonding interface, a relatively low modulus hydrogel on the top, and a relatively high modulus hydrogel on the bottom. The spray-coated PEDOT:PSS constructs an interlocking interface between the top and bottom hydrogels. Compared to the single layer counterparts, both the mechanical and electrical properties were significantly improved. The as-prepared hydrogel showed outstanding stretchability (1763.85 ± 161.66%), quite high toughness (9.27 ± 0.49 MJ/m3), good tensile strength (0.92 ± 0.08 MPa), and decent elastic modulus (69.16 ± 8.02 kPa). A stretchable strain sensor based on the proposed hydrogel shows good conductivity (1.76 S/m), high sensitivity (a maximum gauge factor of 18.14), and a wide response range (0–1869%). Benefitting from the modulus matching between the two layers of the hydrogels, the interfacial interlocking network, and the patch effect of the PEDOT:PSS, the strain sensor exhibits excellent interface robustness with stable performance (>12,500 cycles). These results indicate that the proposed bilayer conductive hydrogel is a promising material for stretchable electronics, soft robots, and next-generation wearables.

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“…Hydrogels with good stretchability, flexibility, and self-healing ability are potential candidate materials for strain sensors. − Most previously reported hydrogel-based strain sensors to date can be divided into two types: those that detect resistance changes caused by shape variations upon stimulation of external forces − and those that detect capacitance changes . Strain sensors have received increasing attention owing to their unique properties and potential applications in the fields of biomedicine, , soft robotics, , supercapacitors, and artificial skins. − But most strain sensors need external power to drive their functions.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing and Highly Stretchable Gelatin Hydrogel for Self-Powered Strain Sensor

Wang

Tang

Wang

et al. 2019

ACS Appl. Mater. Interfaces

206

144

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Hydrogels that electronically respond to mechanical changes can be used as strain sensors. However, these systems usually require external power to convert changes in strain into electrical signals. Here, a self-powered strain sensor is developed based on a gelatinbased hydrogel and a galvanic cell. In the hydrogel matrix, hydrophobic interactions and hydrogen bonding between tannic acid and gelatin give the prepared hydrogel great potential for elongation (1600%). The hydrogel also has a rapid self-healing ability (within 0.65 s) and high self-healing efficiency (95%). The hydrogel operates as an efficient electrolyte material and forms a hydrogel battery when assembled with a thin layer of zinc and an air electrode. This device had excellent tolerance to large compressional strain without sacrificing opencircuit voltage. On the basis of this hydrogel battery, we fabricated a self-powered strain sensor by connecting the hydrogel battery to a fixed resistor to form a closed loop. By converting its chemical energy into electrical energy, the self-powered sensor efficiently converted resistance changes, caused by stretching or compression of the hydrogel, into changes in the voltage output signals without external power. Owing to the stretchability of the hydrogel, the self-powered sensor exhibited good response and flexibility. Self-healing and continuous cycling tests confirmed the long-term stability of the device. These properties suggest that our self-powered sensor has a potential for applications to portable and wearable electronic devices.

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Highly Tough Bioinspired Ternary Hydrogels Synergistically Reinforced by Graphene/Xonotlite Network

Cited by 14 publications

References 37 publications

Double-Network Hydrogel for Stretchable Triboelectric Nanogenerator and Integrated Electroluminescent Skin with Self-Powered Rapid Visual Sensing

Double-Network Hydrogel for Stretchable Triboelectric Nanogenerator and Integrated Electroluminescent Skin with Self-Powered Rapid Visual Sensing

A Bilayer Skin-Inspired Hydrogel with Strong Bonding Interface

Self-Healing and Highly Stretchable Gelatin Hydrogel for Self-Powered Strain Sensor

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