An autonomously healable, highly stretchable and cyclically compressible, wearable hydrogel as a multimodal sensor

Tie, Jianfei; Rong, Liduo; Liu, Hongchen; Wang, Bijia; Mao, Zhiping; Zhang, Linping; Zhong, Yi; Feng, Xueling; Sui, Xiaofeng; Xu, Hong

doi:10.1039/c9py01737b

Cited by 33 publications

(29 citation statements)

References 48 publications

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“…[ 75 ] It was possible to achieve a self‐healable and highly stretchable wearable multimodal sensor using ionic hydrogels, which was achieved by blending Fe 3+ ions with polyvinyl alcohol acetoacetate and polyacrylamide hydrogel to form a double network hydrogel. [ 76 ] Ionotronic hydrogels can also be used to construct stretchable sensors using resistance [ 77 ] or triboelectric [ 78 ] signal transduction approaches.…”

Section: Soft Healthcare Materials Designmentioning

confidence: 99%

Soft Wearable Healthcare Materials and Devices

Lyu

Gong

Yin

et al. 2021

Adv Healthcare Materials

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In spite of advances in electronics and internet technologies, current healthcare remains hospital‐centred. Disruptive technologies are required to translate state‐of‐art wearable devices into next‐generation patient‐centered diagnosis and therapy. In this review, recent advances in the emerging field of soft wearable materials and devices are summarized. A prerequisite for such future healthcare devices is the need of novel materials to be mechanically compliant, electrically conductive, and biologically compatible. It is begun with an overview of the two viable design strategies reported in the literatures, which is followed by description of state‐of‐the‐art wearable healthcare devices for monitoring physical, electrophysiological, chemical, and biological signals. Self‐powered wearable bioenergy devices are also covered and sensing systems, as well as feedback‐controlled wearable closed‐loop biodiagnostic and therapy systems. Finally, it is concluded with an overall summary and future perspective.

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Section: Soft Healthcare Materials Designmentioning

confidence: 99%

Soft Wearable Healthcare Materials and Devices

Lyu

Gong

Yin

et al. 2021

Adv Healthcare Materials

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“…There are many studies on PVA hydrogel sensors, but few possess both flexibility and stability. 3,12,[14][15][16][17][18][19] The introduction of some natural substances such as sodium alginate (SA), polysaccharide chitosan (CS), and agarose (AG) into the PVA hydrogel, to form a composite hydrogel can overcome the limitations of single PVA hydrogel. Among them, the most studied system is the introduction of SA to form a PVA/SA composite hydrogel; therefore, many researchers have devoted efforts to prepare PVA/SA hydrogel by different methods.…”

Section: Introductionmentioning

confidence: 99%

PVA/SA/MXene dual‐network conductive hydrogel for wearable sensor to monitor human motions

Wang

et al. 2021

J of Applied Polymer Sci

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Conductive hydrogels with high flexibility, superior formability, good mechanical elasticity, and excellent biocompatibility have emerged as promising materials for broad applications in flexible/wearable electronic devices. In this work, a conductive dual-network PVA/SA/MXene hydrogel (PSM-h) composed of polyvinyl alcohol, sodium alginate, and MXene (Ti 3 C 2 T x ) is constructed by a green method without using chemical crosslinking agents. The resultant hydrogel with dual-network feature shows excellent cytocompatibility (no toxicity for human umbilical cord mesenchymal stem cells), high stretchability (up to 263%), and superior anti-fatigue ability (stretched up to 1000 cycles). More importantly, PSM-h based strain sensor presents good sensing sensitivity with a fast response time (62.5 ms) and a low detection limit even under a very slight strain of 0.2%. In terms of the practical application, the PSM-h based strain sensor can be applied to detect and distinguish various human motions.

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“…These introduced components can form a conductive network in the hydrogel to transfer electrons and finally result in good conductivity [64]. Generally, the higher the content of the filling components, the better the conductivity, while more filling components in hydrogels easily promote filler agglomeration and result in phase separation between the filling component and polymer matrix, subsequently reducing the stretchability, toughness, fatigue resistance and self-healing property of the sensors [65][66][67][68]. Typically, surface modification of the conductive filler or cross-linking agent is used to improve the affinity of the conductive filler to the hydrogel matrix and inhibit phase separation.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Zhang

Wang

Wei

et al. 2021

Gels

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Sensors are devices that can capture changes in environmental parameters and convert them into electrical signals to output, which are widely used in all aspects of life. Flexible sensors, sensors made of flexible materials, not only overcome the limitations of the environment on detection devices but also expand the application of sensors in human health and biomedicine. Conductivity and flexibility are the most important parameters for flexible sensors, and hydrogels are currently considered to be an ideal matrix material due to their excellent flexibility and biocompatibility. In particular, compared with flexible sensors based on elastomers with a high modulus, the hydrogel sensor has better stretchability and can be tightly attached to the surface of objects. However, for hydrogel sensors, a poor mechanical lifetime is always an issue. To address this challenge, a self-healing hydrogel has been proposed. Currently, a large number of studies on the self-healing property have been performed, and numerous exciting results have been obtained, but there are few detailed reviews focusing on the self-healing mechanism and conductivity of hydrogel flexible sensors. This paper presents an overview of self-healing hydrogel flexible sensors, focusing on their self-healing mechanism and conductivity. Moreover, the advantages and disadvantages of different types of sensors have been summarized and discussed. Finally, the key issues and challenges for self-healing flexible sensors are also identified and discussed along with recommendations for the future.

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An autonomously healable, highly stretchable and cyclically compressible, wearable hydrogel as a multimodal sensor

Abstract: Fe3+/PVAA-PAM hydrogels show highly stretchable, self-healing properties and can be used as artificial ionic skin for directly monitoring human motion.

Cited by 33 publications

References 48 publications

Soft Wearable Healthcare Materials and Devices

Soft Wearable Healthcare Materials and Devices

PVA/SA/MXene dual‐network conductive hydrogel for wearable sensor to monitor human motions

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

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