Anti-freezing and moisturizing conductive hydrogels for strain sensing and moist-electric generation applications

He, Pan; Wu, Junying; Pan, Xiaofeng; Chen, Lihui; Li, Kai; Gao, Haili; Wu, Hui; Cao, Shilin; Huang, Liulian; Ni, Yonghao

doi:10.1039/c9ta12940e

Cited by 191 publications

(126 citation statements)

References 37 publications

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“…In the paper industry, hydrolyzed poly vinyl alcohol (PVA) is applied as a binder for paper surface treatment, and it can also be added at the papermaking wet-end (Fatehi et al 2011 ). In hydrogel application, PVA, which is rich in hydroxyl groups, forms strong crosslinked networks (Yuan et al 2019 ), and PVA based hydrogels have various applications, including strain sensors (He et al 2020 ; Hu et al 2021 ). In addition, for its dissolvable polymeric barrier attribute, PVA has been used to program/automate sequential reactions in LFA (Han et al 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Improving the sensitivity of cellulose fiber-based lateral flow assay by incorporating a water-dissolvable polyvinyl alcohol dam

Alam

et al. 2021

Cellulose

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Lateral flow assay (LFA) is an important point-of-care (POC) test platform due to the associated portability, on-site testing, and low cost for diagnosis of pathogen infections and disease biomarkers. However, compared to high-end analyzers in hospitals, LFA devices, in particular, paper-based LFA tests, fall short in accuracy. This study focuses on two ways to improve LFAs: (1) using cellulose fibers, rather than glass fibers for a sample pad, and (2) incorporating a one-step simple, facile, and low cost PVA dam into the LFA. Both strategies (cellulose fiber as a sample pad and water dissolvable PVA dam) contributed to delaying the controlled biomolecule's flow through the nitrocellulose membrane's capillary channels resulting in increased bio-recognition time, thus contributing to the enhancement of LFA sensitivity. PVA modified cellulose fiber-based LFA demonstrated 10 times higher sensitivity than the cellulose fiber-based unmodified LFA, whereas 2 times enhancement was obtained in the cellulose fiber-based sample pad LFA compared to the glass fiber-based sample pad LFA. Ultimately, 20 times increase in sensitivity was achieved in the modified LFA device. This study shows that PVA and eco-friendly cellulose fibers could be incorporated into other paper based POC testing devices for future development.

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Section: Introductionmentioning

confidence: 99%

Improving the sensitivity of cellulose fiber-based lateral flow assay by incorporating a water-dissolvable polyvinyl alcohol dam

Alam

et al. 2021

Cellulose

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“…[10] To evaluate the balanced performance of the emulsion gel-based flexible strain sensor, radar plots of responsiveness, stretchability, and conductivity with other reported gel-based strain sensors were shown in Figure S9d in the Supporting Information. Compared with other gel-based sensors published lately, [11,21] the emulsion gel sensors displayed the highest gauge factor, high work range (than 1000 %) and good conductivity.…”

Section: Sensing Performance Of Emulsion Gelsmentioning

confidence: 78%

Ultra‐Sensitive and Ultra‐Stretchable Strain Sensors Based on Emulsion Gels with Broad Operating Temperature

Chai

Zhang

et al. 2021

Chemistry A European J

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Hydrogels with mechanical elasticity and conductivity are ideal materials in wearable devices. However, traditional hydrogels are fragile upon mechanical loading and lose functions in climate change because the internal water undergoes freeze and dehydration. Herein, we synthesize stable emulsions at high and low temperatures by introducing glycerol into the W/W emulsions. Then the high-stable emulsions are used as templates to produce the freestanding emulsion gels with enhanced mechanical strength and conductivity. The introduction of glycerol endows emulsions and emulsion gels with high and low temperature resistance (À 20 to 90°C). The fabricated strain sensors based on emulsion gels show high sensitivity (gauge factor = 6.240), high stretchability (1081 %), fatigue resistance, self-healing and adhesion properties, realizing the repeatable and accurate detection of various human motions. These highperformance and eco-friendly emulsion gels can be promising candidates for next-generation artificial skin and humanmachine interface.

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“…As a proof-of-principle assay, the healing effect of the PPGS DCH was explored in a skin wound model in rats, where it showed a faster healing rate. [83] Zeng et al reported a DCH based on hydrogen bonds by incorporating multiple 2-ureido-4[1H]-pyrimidinone (UPy) groups as crosslinking points into a brittle polyaniline/poly(4-styrene sulfonate) (PANI/PSS) network. Due to its linear mechanical properties and electronic conductivity, the interpenetrated PANI/PSS network can accurately and reliably detect various human motions.…”

Section: Hydrogen Bondsmentioning

confidence: 99%

Conductive Hydrogels with Dynamic Reversible Networks for Biomedical Applications

Gaillez

Rothe

et al. 2021

Adv Healthcare Materials

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Conductive hydrogels (CHs) are emerging as a promising and well-utilized platform for 3D cell culture and tissue engineering to incorporate electron signals as biorelevant physical cues. In conventional covalently crosslinked conductive hydrogels, the network dynamics (e.g., stress relaxation, shear shining, and self-healing) required for complex cellular functions and many biomedical utilities (e.g., injection) cannot be easily realized. In contrast, dynamic conductive hydrogels (DCHs) are fabricated by dynamic and reversible crosslinks. By allowing for the breaking and reforming of the reversible linkages, DCHs can provide dynamic environments for cellular functions while maintaining matrix integrity. These dynamic materials can mimic some properties of native tissues, making them well-suited for several biotechnological and medical applications. An overview of the design, synthesis, and engineering of DCHs is presented in this review, focusing on the different dynamic crosslinking mechanisms of DCHs and their biomedical applications.

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Anti-freezing and moisturizing conductive hydrogels for strain sensing and moist-electric generation applications

Abstract: An anti-freezing and moisturizing conductive hydrogel, capable of harvesting energy from moisture, was developed by incorporating tannic acid and carbon nanotubes into polyvinyl alcohol containing a water–glycerol dispersion.

Cited by 191 publications

References 37 publications

Improving the sensitivity of cellulose fiber-based lateral flow assay by incorporating a water-dissolvable polyvinyl alcohol dam

Improving the sensitivity of cellulose fiber-based lateral flow assay by incorporating a water-dissolvable polyvinyl alcohol dam

Ultra‐Sensitive and Ultra‐Stretchable Strain Sensors Based on Emulsion Gels with Broad Operating Temperature

Conductive Hydrogels with Dynamic Reversible Networks for Biomedical Applications

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