A water-retaining, self-healing hydrogel as ionic skin with a highly pressure sensitive properties

Wang, Shuxue; Li, Qiurong; Feng, Shuangjiang; Lv, Yuanfei; Zhang, Tao

doi:10.1016/j.jtice.2019.09.005

Cited by 14 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Very meaningful research results including remote liquefaction (Figure 6(a)) [127], molecular ink [128], contact lens sensor [129], and so on [130][131][132][133] are also reported. As a biocompatible polymer, PVA-based hydrogels prepared with bimetallic ions as crosslinking agents have high water retention properties, excellent mechanical strength, and self-healing properties and have also been studied for artificial skin and wearable sensor devices (Figure 6(b)) [120,134]. Moreover, in the aspect of anticounterfeiting, it also reported that the self-healable PVA hydrogel can display embedded fluorescent color under ultraviolet, as shown in Figure 6(c) [135].…”

Section: 42mentioning

confidence: 99%

Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

Wang

Bai

Shao

et al. 2021

International Journal of Polymer Science

View full text Add to dashboard Cite

Hydrogels have three-dimensional network structures, high water content, good flexibility, biocompatibility, and stimulation response, which have provided a unique role in many fields such as industry, agriculture, and medical treatment. Poly(vinyl alcohol) PVA hydrogel is one of the oldest composite hydrogels. It has been extensively explored due to its chemical stability, nontoxic, good biocompatibility, biological aging resistance, high water-absorbing capacity, and easy processing. PVA-based hydrogels have been widely investigated in drug carriers, articular cartilage, wound dressings, tissue engineering, and other intelligent materials, such as self-healing and shape-memory materials, supercapacitors, sensors, and other fields. In this paper, the discovery, development, preparation, modification methods, and applications of PVA functionalized hydrogels are reviewed, and their potential applications and future research trends are also prospected.

show abstract

Section: 42mentioning

confidence: 99%

Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

Wang

Bai

Shao

et al. 2021

International Journal of Polymer Science

View full text Add to dashboard Cite

show abstract

“…In contrast, the residual mass of the hydrogel without LiCl reduced to only 40%. The water-retention capacity of PAAm-collagen hydrogel in comparison with orther hydrogels was shown in Table S3 [ 41,[48][49][50][51]. Due to the excellent water retention ability, the PAAm-collagen hydrogel still possessed high mechanical property and conductivity after being stored at 25°C for 7 days (Fig.…”

Section: Resultsmentioning

confidence: 99%

An environment-stable hydrogel with skin-matchable performance for human-machine interface

et al. 2021

View full text Add to dashboard Cite

Ionic hydrogel-based sensors have shined a spotlight on wearable electronics. However, the sensitivity and reliability of hydrogel devices are significantly hampered by the weak adhesion of skin-sensor interface as well as inferior temperature tolerance. Here, inspired by the structure and composition of dermis, a novel skin-attachable and environment-stable hydrogel was designed by integrating collagen into the LiCl-containing chemically cross-linked polyacrylamide hydrogel. The hydrogel exhibited skin-like mechanical properties of low modulus, superior stretchability as well as excellent elasticity. Furthermore, the introduction of collagen endowed the hydrogel with robust and seamless interfaces with diverse materials, including the curved skin. As a result, the hydrogel is capable of serving as a human-machine interface for collecting reliable electrocardiography (ECG) signals and discerning various human motions, with high sensitivity (gauge factor = 10.7), fast response, negligible hysteresis as well as extensive monitoring range. Notably, the hydrogel that can mimick the temperature-tolerant mechanism of most organisms possesses persistent stabilization of adhesive, conductive, sensory and mechanical performances at subzero or ambient conditions. The skin-inspired strategy paves an effective way for the design of multifunctional materials with potential applications in next-generation electronics.

show abstract

“…In recent studies of self-healing ionic conductive hydrogel flexible sensors, conductive ions such as Fe 3+ , [124,125] Na + , [126][127][128][129] [110] glycerol-plasticized polyvinyl alcohol-borax (PVA-borax) / 0.05 [111] polyvinyl alcohol, phenylboronic acid grafted alginate, and polyacrylamide 1.1 × 10 −2 0.064 [112] polyvinyl alcohol and borax / 0.23 [74] Carbon nanotubes polyacrylamide /chitosan hybrid / 0.06 [113] hydrophobic associated polyacrylamide hydrogel / 0.3 [114] Polyacrylamide hydrogels 0.5 0.91 [115] Silver nanoparticles polyion complex/polyaniline hybrid / 3. Al 3+ , [130] ammonium persulfate, [131] sulfuric acid, [132] and lithium chloride [133,134] have been reported. Chen et al fabricated a robust, tough and self-healing ionically conductive hydrogel sensors based on synergistic multiple non-covalent bonds between carboxymethyl guar gum (CMGG), poly (acrylic acid) (PAA) and iron metal ions (Fe 3+ ).…”

Section: Conductivity Of Hydrogel Flexible Sensormentioning

confidence: 99%

“…Wang et al successfully fabricated a skin sensor and constructed a sandwich structure by introducing PDMS (polydimethylsiloxane) as a water retaining layer into the flexible hydrogels prepared by sodium dodecyl benzenesulfonate (SDBS) and bimetal ions (Fe 3+ , Al 3+ ) to maintain water as seen in Figure 9b,c. [130]…”

Section: Stability Of Hydrogel Flexible Sensormentioning

confidence: 99%

“…Ion conductive hydrogels consist of a large number of free ions in a 3D polymer network with similar flexibility as biological systems, making them ideal candidates for wearable flexible devices. In recent studies of self‐healing ionic conductive hydrogel flexible sensors, conductive ions such as Fe 3+ , [ 124,125 ] Na + , [ 126–129 ] Al 3+ , [ 130 ] ammonium persulfate, [ 131 ] sulfuric acid, [ 132 ] and lithium chloride [ 133,134 ] have been reported. Chen et al.…”

Section: Self‐healing Hydrogel Flexible Sensormentioning

confidence: 99%

See 1 more Smart Citation

Flexible Self‐Repairing Materials for Wearable Sensing Applications: Elastomers and Hydrogels

Zhou

Dong

et al. 2020

Macromol. Rapid Commun.

View full text Add to dashboard Cite

related operations, and destroy the operation of the whole equipment (system). Bao and his colleagues developed a novel self-healing and mechanical force-sensing flexible sensor using micro-structured elastomeric dielectrics, which served as a foundation to improve the stability and lifetime of flexible sensors. [8] Self-healing flexible materials can be divided into two categories, one is solvent-less or water-free after curing and high degree of polymerization of elastomers, such as polyamide, polyurethane, etc., the other is hydrogels, low degree of polymerization, structural cross-linking. In self-healing flexible elastomer sensors, the structure of elastomer is mostly linear structure or semi-cross-linked structure; the elastomer of cross-linked structure is poor flexibility and fragile due to its high degree of polymerization. The elasticity of semi-crosslinked structure has excellent resilience and great potential in the field of flexible flexural sensors. In the past two years, self-healing flexible hydrogels have attracted extensive attention due to their excellent stretchability and resilience, as well as outstanding performance in the preparation of sensors with high sensitivity and fast response. [9,10] Sensors with elastomers and hydrogels as flexible matrices face great difficulties in conductivity, which affects the sensitivity and stability of the sensors. Filling conductive materials is the most commonly method, in which organic conductive polymers (polyaniline, [11] polypyrrole [12]) are filled to construct conductive networks, and good interfacial compatibility results in uniform conductive polymer elastomers, but the inherent color fillers affect the transparency of flexible sensors, limiting their applications in the biomedical field. [13-17] Flexible materials filled with inorganic conductive particles (graphene, nano-silver wire) have high conductivity, but phase separation between filler and matrix usually reduces the tensile, toughness and fatigue resistance, and even affects the self-healing ability of flexible materials. Modified fillers are often required to improve affinity for flexible matrices and inhibit phase separation. However, many hydrogel matrices are intrinsically weak and cannot withstand cyclic loadings. [18] Although surface modified fillers can improve strength and toughness, it is difficult to compensate for the inherent weaknesses. For self-healing flexible elastomers, conductive flexible materials can still be endowed with conductivity by scraping or printing conductive particles on the Flexible pressure and strain sensors have great potential for applications in wearable and implantable devices, soft robots, and artificial skin. The introduction of self-healing performance has made a positive contribution to the lifetime and stability of flexible sensors. At present, many self-healing flexible sensors with high sensitivity have been developed to detect the signal of organism activity. The sensitivity, reliability, and stability of self-healing flexible sensors depend...

show abstract

A water-retaining, self-healing hydrogel as ionic skin with a highly pressure sensitive properties

Cited by 14 publications

References 31 publications

Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

An environment-stable hydrogel with skin-matchable performance for human-machine interface

Flexible Self‐Repairing Materials for Wearable Sensing Applications: Elastomers and Hydrogels

Contact Info

Product

Resources

About