Transparent, high-strength, stretchable, sensitive and anti-freezing poly(vinyl alcohol) ionic hydrogel strain sensors for human motion monitoring

Pan, Shenxin; Meng, Xiangjian; Li, Hanhong; Jiang, Xueliang; He, Peixin; Sun, Zhengguang; Zhang, Yuhong

doi:10.1039/c9tc06338b

Cited by 139 publications

(83 citation statements)

References 54 publications

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“…Moreover, the high strength and toughness of the hydrogels were created by soaking the virgin PVA/glycerol hydrogels into a saturated NaCl solution at room temperature for a definite period of time to produce PVA/glycerol/NaCl hydrogels. 85 In many cases crystallization can even give better mechanical strength than chemical crosslinking.…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Synthesis, classification and properties of hydrogels: their applications in drug delivery and agriculture

et al. 2022

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Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Synthesis, classification and properties of hydrogels: their applications in drug delivery and agriculture

et al. 2022

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“…With the emerging research on soft electronic devices such as on‐skin electronics and wearable devices for human motion detection, stretchable conductive materials have attracted significant attention 2–24 . These next‐generation soft electronic materials are highly deformable and stretchable for wearable applications, beyond flexible and bendable.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the development of mechanically strong soft materials with high conductivities is crucial. Recently, various types of deformable electronics have been fabricated with soft materials, mainly from polymeric systems such as hydrogels, 1–14 ionogels, 15–19 and elastomers 20–24 owing to their excellent mechanical and electrical properties. Among them, hydrogels consisting of hydrophilic polymer networks, have been considered as attractive based material for soft electronic system because they are stretchable, transparent, and able to be designed as conductive materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanically tough dry‐free ionic hydrogel microfibers swollen in aqueous electrolyte prepared by microfluidic devices

Fitria

Yoon

2022

Journal of Polymer Science

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Soft conducting materials in the shape of microfibers with various functional geometries are crucial for soft electronics. To develop highly stretchable conducting microfibers, a microfluidic method is used to prepare hydrogels in a double‐network structure. Based on the coagulation of chitosan in cold water and simultaneous photopolymerization and photocrosslinking of N‐isopropylacrylamide and N‐diethylacrylamide, long microfibers with controlled uniform diameters can be obtained at the junction of a coaxially aligned microchannel device. After further reinforcement of the chitosan chain and exchange of the medium of the hydrogel microfiber with an aqueous electrolyte of lithium bis(trifluoromethanesulfonyl)imide, the prepared ionic hydrogel exhibits high conductivity and stretchability and dry‐free properties. Owing to its mechanical robustness and ionic conductivity, we envision a highly stretchable soft electrode with the prepared ionic hydrogel microfiber that can be stretched up to 900%. This fiber has potential for applications in soft electronics and wearable devices.

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“…Recently, some polyol agents (e.g., glycol, glycerol, sorbitol, etc.) has been introduced into hydrogels to improve the freezing-tolerant property of hydrogel ( Liao et al, 2019 ; Tu et al, 2019 ; Wu et al, 2019 ; Pan et al, 2020 ; Peng et al, 2020 ). These anti-freezing agents can effectively reduce the aggregation of water molecules and weaken their internal hydrogen bonding, resulting in preventing the formation of ice crystalline and decreasing the freezing points of hydrogels.…”

Section: Introductionmentioning

confidence: 99%

“…Based on this idea, Peng et al constructed an anti-freezing PVA-PEDOT/PSS DN organohydrogel by directly using glycol-water binary solvent as dispersion medium ( Peng et al, 2020 ). Pan et al prepared a poly(vinyl alcohol) hydrogel by dissolving poly(vinyl alcohol) in glycerol-water binary solvent, followed by soaking it in saturated NaCl aqueous solution, the obtained organohydrogel-based sensor could maintain good strain-sensitive performance at −20°C ( Pan et al, 2020 ). However, these hydrogels could not heal once damaged.…”

Section: Introductionmentioning

confidence: 99%

Ionic Conductive Organohydrogel With Ultrastretchability, Self-Healable and Freezing-Tolerant Properties for Wearable Strain Sensor

Feng

Jiang

et al. 2021

Front. Chem.

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Currently, stretchable hydrogel has attracted great attention in the field of wearable flexible sensors. However, fabricating flexible hydrogel sensor simultaneously with superstretchability, high mechanical strength, remarkable self-healing ability, excellent anti-freezing and sensing features via a facile method remains a huge challenge. Herein, a fully physically linked poly(hydroxyethyl acrylamide)-gelatin-glycerol-lithium chloride (PHEAA-GE-Gl-LiCl) double network organohydrogel is prepared via a simple one-pot heating-cooling-photopolymerization method. The prepared PHEAA-GE-Gl-LiCl organohydrogel exhibits favorable stretchability (970%) and remarkable self-healing property. Meanwhile, due to the presence of glycerol and LiCl, the PHEAA-GE-Gl-LiCl organohydrogel possesses outstanding anti-freezing capability, it can maintain excellent stretchability (608%) and conductivity (0.102 S/m) even at −40°C. In addition, the PHEAA-GE-Gl-LiCl organohydrogel-based strain sensor is capable of repeatedly and stably detecting and monitoring both large-scale human motions and subtle physiological signals in a wide temperature range (from −40°C to 25°C). More importantly, the PHEAA-GE-Gl-LiCl organohydrogel-based sensor displays excellent strain sensitivity (GF = 13.16 at 500% strain), fast response time (300 ms), and outstanding repeatability. Based on these super characteristics, it is envisioned that PHEAA-GE-Gl-LiCl organohydrogel holds promising potentials as wearable strain sensor.

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Transparent, high-strength, stretchable, sensitive and anti-freezing poly(vinyl alcohol) ionic hydrogel strain sensors for human motion monitoring

Abstract: Transparent, high-strength, stretchable, sensitive and anti-freezing poly(vinyl alcohol) ionic hydrogel sensors were facilely fabricated for human motion monitoring.

Cited by 139 publications

References 54 publications

Synthesis, classification and properties of hydrogels: their applications in drug delivery and agriculture

Synthesis, classification and properties of hydrogels: their applications in drug delivery and agriculture

Mechanically tough dry‐free ionic hydrogel microfibers swollen in aqueous electrolyte prepared by microfluidic devices

Ionic Conductive Organohydrogel With Ultrastretchability, Self-Healable and Freezing-Tolerant Properties for Wearable Strain Sensor

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