Freezing-tolerant and robust gelatin-based supramolecular conductive hydrogels with double-network structure for wearable sensors

Yang, Jia; Sun, Xiangbin; Kang, Qiong; Zhu, Lin; Qin, G.; Chen, Qiang

doi:10.1016/j.polymertesting.2020.106879

Cited by 38 publications

(18 citation statements)

References 51 publications

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“…CEHs exhibited excellent electrical conductivity due to the free diffusion of ions in the hydrogel network. Furthermore, CEH was able to conduct self-healing and recover the circuit and light up the LED after being cut off, as shown in Figure b. , …”

Section: Resultsmentioning

confidence: 99%

Antifreezing, Ionically Conductive, Transparent, and Antidrying Carboxymethyl Chitosan Self-Healing Hydrogels as Multifunctional Sensors

Gong

Zhao

Wang

et al. 2022

ACS Biomater. Sci. Eng.

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Through a simple strategy of immersion in a mixed solution of water/ethylene glycol (EG)/lithium chloride (LiCl), self-healing carboxymethyl chitosan (CA) hydrogels, that is, CA/N-vinylpyrrolidone-EG-Li+ hydrogels (CEH) with an ultra-low-temperature freezing resistance below −70 °C were fabricated. The introduction of electrolyte ions and small-molecule polyol also made these hydrogels highly conductive (0.8 S m–1) and imparted antidrying property to them, showing stable and reversible sensitivity to finger-wrist bending as well as 150 cycles of stretching. Such hydrogels also presented highly efficient self-healing ability, with a stress–strain healing efficiency of over 90%. Furthermore, the CEH-based sensors maintained a stable sensing performance over a wide range of temperatures below the freezing point (from −10 to −70 °C) and exhibited stable sensitivity to temperatures with fast response and no significant hysteresis. The present work is expected to provide a simple and sustainable route for the preparation of multifunctional antifreezing conductive hydrogels based on CA, leading to a wide range of potential applications in soft sensor devices.

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Section: Resultsmentioning

confidence: 99%

Antifreezing, Ionically Conductive, Transparent, and Antidrying Carboxymethyl Chitosan Self-Healing Hydrogels as Multifunctional Sensors

Gong

Zhao

Wang

et al. 2022

ACS Biomater. Sci. Eng.

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“…However, these gels tend to freeze inevitably at sub-zero temperatures, leading to a gradual decline in their mechanical and electrical properties. In order to overcome these drawbacks, Yang et al [63] developed the freezing tolerant supramolecular conductive hydrogels composed of poly(N-hydroxymethyl acrylamide) (PHA), gelatin, and glycerol, via a one-pot synthesis. The unique combination was formulated around the interactions between gelatin and PHA network in order to create a double network PHA/gelatin/glycerol conductive hydrogel.…”

Section: Crosslinking In Conductive Hydrogelsmentioning

confidence: 99%

“…Hence, many research groups are currently focusing on developing an elastic conductive hydrogel, for example, hybrid crosslinking and double networking hydrogels in order to enhance the mechanical properties of the hydrogels. [62][63][64] The properties of the conducting hydrogel vary, depending on the type of conductive filler, crosslinking, and the components involved in structuring a hydrogel matrix. [65] For practical application, the conductive gels need to be biocompatible and mechanically strong with good flexibility in order to resist high stressstrains created by the movement of internal tissues/cells of humans.…”

Section: Introductionmentioning

confidence: 99%

Crosslinking Trends in Multicomponent Hydrogels for Biomedical Applications

Dodda

Azar

Sadiku

2021

Macromolecular Bioscience

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Multicomponent-based hydrogels are well established candidates for biomedical applications. However, certain aspects of multicomponent systems, e.g., crosslinking, structural binding, network formation, proteins/drug incorporation, etc., are challenging aspects to modern biomedical research. The types of crosslinking and network formation are crucial for the effective combination of multiple component systems. The creation of a complex system in the overall structure and the crosslinking efficiency of different polymeric chains in an organized fashion are crucially important, especially when the materials are for biomedical applications. Therefore, the engineering of hydrogel has to be, succinctly understood, carefully formulated, and expertly designed. The different crosslinking methods in use, hydrogen bonding, electrostatic interaction, coordination bonding, and self-assembly. The formations of double, triple, and multiple networks, are well established. A systematic study of the crosslinking mechanisms in multicomponent systems, in terms of the crosslinking types, network formation, intramolecular bonds between different structural units, and their potentials for biomedical applications, is lacking and therefore, these aspects require investigations. To this end, the present review, focuses on the recent advances in areas of the physical, chemical, and enzymatic crosslinking methods that are often, employed for the designing of multicomponent hydrogels.

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“…Gelatin, yet another biocompatible and biodegradable polymer, is widely used in photography, food, pharmaceutical, biomedical and many others applications [13][14][15][16][17]. It has poor mechanical properties that limit its potential applications.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Optimization of Real-Time Photoresponsive Gelatin for Direct Laser Writing

et al. 2022

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There is an abundance of plastic materials used in the widest range of applications, such as packaging, machine parts, biomedical devices and components, etc. However, most materials used today are non-decomposable in the environment, producing a huge burden on ecosystems. The search for better, safer alternatives is still on. Here we present a detailed analysis of a simple, cheap, non-toxic, even edible, eco-friendly material, which can be easily manufactured, laser patterned and used for the fabrication of complex structures. The base substance is gelatin which is made photoresponsive by adding plasticizers and sensitizers. The resulting films were analyzed with respect to their optical, thermal and mechanical properties, which can be modified by a slight variation of chemical composition. The material is optimized for rapid laser-manufacturing of elastic microstructures (lenses, gratings, cantilevers, etc.) without any waste or residues. Overall, the material properties were tailored to increase photothermal responsivity, improve the surface quality and achieve material homogeneity, transparency and long-term stability (as verified using electron microscopy, infrared spectroscopy and differential scanning calorimetry).

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Freezing-tolerant and robust gelatin-based supramolecular conductive hydrogels with double-network structure for wearable sensors

Cited by 38 publications

References 51 publications

Antifreezing, Ionically Conductive, Transparent, and Antidrying Carboxymethyl Chitosan Self-Healing Hydrogels as Multifunctional Sensors

Antifreezing, Ionically Conductive, Transparent, and Antidrying Carboxymethyl Chitosan Self-Healing Hydrogels as Multifunctional Sensors

Crosslinking Trends in Multicomponent Hydrogels for Biomedical Applications

Characterization and Optimization of Real-Time Photoresponsive Gelatin for Direct Laser Writing

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