Lignin-containing hydrogels with anti-freezing, excellent water retention and super-flexibility for sensor and supercapacitor applications

Mondal, Ajoy Kanti; Xu, Dezhong; Wu, Shuai; Zou, Qiuxia; Lin, Weijie; Huang, Fang; Ni, Yonghao

doi:10.1016/j.ijbiomac.2022.06.030

Cited by 27 publications

(6 citation statements)

References 56 publications

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“…In practice, if the hydrogel is exposed to the environment for a long time, it will gradually dry out, seriously affecting its performance and longevity. , Therefore, good moisture retention is another key property. To investigate the moisturizing properties of PEW organohydrogels, we recorded their weight changes when they were left at room temperature, as displayed in Figure g, and the volume of the hydrogels decreased as time increased.…”

Section: Resultsmentioning

confidence: 99%

High-Strength, Freeze-Resistant, Recyclable, and Biodegradable Polyvinyl Alcohol/Glycol/Wheat Protein Complex Organohydrogel for Wearable Sensing Devices

Li,

Liu,

Chen

et al. 2023

Biomacromolecules

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The application of flexible wearable sensing devices based on conductive hydrogels in human motion signal monitoring has been widely studied. However, conventional conductive hydrogels contain a large amount of water, resulting in poor mechanical properties and limiting their application in harsh environments. Here, a simple one-pot method for preparing conductive hydrogels is proposed, that is, polyvinyl alcohol (PVA), wheat protein (WP), and lithium chloride (LiCl) are dissolved in an ethylene glycol (EG)/water binary solvent. The obtained PVA/EG/WP (PEW) conductive organohydrogel has good mechanical properties, and its tensile strength and elongation at break reach 1.19 MPa and 531%, respectively, which can withstand a load of more than 6000 times its own weight without breaking. The binary solvent system composed of EG/water endows the hydrogel with good frost resistance and water retention. PEW organohydrogel as a wearable strain sensor also has good strain sensitivity (GF = 2.36), which can be used to detect the movement and physiological activity signals in different parts of the human body. In addition, PEW organohydrogels exhibit good degradability, reducing the environmental footprint of the flexible sensors after disposal. This research provides a new and viable way to prepare a new generation of environmentally friendly sensors.

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Section: Resultsmentioning

confidence: 99%

High-Strength, Freeze-Resistant, Recyclable, and Biodegradable Polyvinyl Alcohol/Glycol/Wheat Protein Complex Organohydrogel for Wearable Sensing Devices

Li,

Liu,

Chen

et al. 2023

Biomacromolecules

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“…The hydrogels obtained a high ionic conductivity (6.85 S m −1 ) due to the high concentration of Ni 2+ provided. [ 129 ]…”

Section: Biomass‐based Materials For Supercapacitormentioning

confidence: 99%

Biomass‐based materials for advanced supercapacitor: principles, progress, and perspectives

Wang,

Xu,

Liu

et al. 2023

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Supercapacitors exhibit considerable potential as energy storage devices due to their high power density, fast charging and discharging abilities, long cycle life, and eco‐friendliness. With the increasing environmental concerns associated with synthetic compounds, the use of environment friendly biopolymers to replace conventional petroleum‐based materials has been widely studied. Biomass‐based materials are biodegradable, renewable, environment friendly and non‐toxic. The unique hierarchical nanostructure, excellent mechanical properties and hydrophilicity allow them to be used to create functional conductive materials with precisely controlled structures and different properties. In this review, the latest development of biomass‐based supercapacitor materials is reviewed and discussed. This paper describes the physical and chemical properties of various biopolymers and their impact on supercapacitors, as well as the classification and basic principles of supercapacitors. Then, a comprehensive discussion is presented on the utilization of biomass‐based materials in supercapacitors and their recent applications across a range of supercapacitor devices. Finally, an overview of the future prospects and challenges pertaining to the utilization of biomass‐based materials in supercapacitors is provided.

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“…Lignin, an aromatic polymer derived from natural polymers, is an ideal material for multifunctional hydrogel preparation due to its biocompatibility, antioxidant properties, and ultraviolet (UV) absorbency 13,14 . For water‐soluble lignin such as lignosulfonate, it can be added directly to the hydrogel 15,16 . However, lignin with poor water solubility is usually made into nanoparticles to increase its dispersibility in hydrogels 17,18 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the elongation of the hydrogel is low due to the high cross‐linking density. During the formation process of the hydrogel, the phenolic hydroxyl groups in lignin will generate free radicals in the presence of an initiator and subsequently react with acrylic acid to create a grafted structure 15 . Therefore, the water solubility of lignin needs to meet certain requirements.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 For water-soluble lignin such as lignosulfonate, it can be added directly to the hydrogel. 15,16 However, lignin with poor water solubility is usually made into nanoparticles to increase its dispersibility in hydrogels. 17,18 It is noticeable that lignin contains abundant functional groups (hydroxyl and carboxyl) and chemically active sites (C3 and C5 positions of the aromatic ring), 19 which can enhance its application in hydrogels by chemical modification.…”

Section: Introductionmentioning

confidence: 99%

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Modified lignin‐induced composite hydrogels with good mechanical properties, adhesion, and UV resistance for strain sensors

Chen,

Li,

et al. 2023

J of Applied Polymer Sci

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The flexibility and functionality of conductive hydrogels are crucial to applications under various scenarios and complex environments. Due to single functionality and weakness in mechanical properties, the application of conductive hydrogels in flexible wearable devices remains a challenge. In this study, lignin‐graft‐poly(acrylic acid) (LPAA) was incorporated into acrylamide (AM)/sodium chloride (NaCl) solution to fabricate composite conductive hydrogels. NaCl enhanced the conductivity of hydrogels. The hydrogen‐bond crosslinking network was formed by adding LPAA into the hydrogel, which enhanced the mechanical properties of the hydrogel (the tensile strength was 96 kPa and the compressive strength was 0.54 MPa). With LPAA added, the adhesion of hydrogels was improved to 11.3 kPa on glass, 14.2 kPa on plastic, and 17.3 kPa on metal. LPAA also provided excellent UV shielding ability (99.95%) for hydrogels while maintaining good transparency. The conductive hydrogels with good sensitivity (Gauge Factor = 2.51, 100%–500%) and stability can be used as strain sensors for monitoring physical activity. It is expected to be a candidate material for future flexible wearable electronic devices.

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Lignin-containing hydrogels with anti-freezing, excellent water retention and super-flexibility for sensor and supercapacitor applications

Cited by 27 publications

References 56 publications

High-Strength, Freeze-Resistant, Recyclable, and Biodegradable Polyvinyl Alcohol/Glycol/Wheat Protein Complex Organohydrogel for Wearable Sensing Devices

High-Strength, Freeze-Resistant, Recyclable, and Biodegradable Polyvinyl Alcohol/Glycol/Wheat Protein Complex Organohydrogel for Wearable Sensing Devices

Biomass‐based materials for advanced supercapacitor: principles, progress, and perspectives

Modified lignin‐induced composite hydrogels with good mechanical properties, adhesion, and UV resistance for strain sensors

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