Self-healing, anti-freezing, adhesive and remoldable hydrogel sensor with ion-liquid metal dual conductivity for biomimetic skin

Zhou, Zixuan; Qian, Chunhua; Yuan, Weizhong

doi:10.1016/j.compscitech.2020.108608

Cited by 167 publications

(107 citation statements)

References 45 publications

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“…In contrast, conductive nanofillers respond to strain or temperature as a result of the general disconnection principle and the effect of heat on carrier mobility 16 , 17 . Generally, metal-based nanoparticles reduce the payload of flexible integrated system because of the higher density, and carbon-based materials with large specific surface area and lower density need to be added in large amounts for achieving suitable conductivity and sensitivity, which is detriment to the toughness and strain range, failing to meet the portability requirements of flexible electronics 18 – 22 . In comparison, the emerging 2D transition metal carbides (MXenes) are possessed with metallic conductivity and higher specific surface area, together with the amelioration of stability in oxygen, which have been developed as revolutionary materials used in electrochemistry 10 , 11 , 23 – 27 .…”

Section: Introductionmentioning

confidence: 99%

Approaching intrinsic dynamics of MXenes hybrid hydrogel for 3D printed multimodal intelligent devices with ultrahigh superelasticity and temperature sensitivity

et al. 2022

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Hydrogels are investigated broadly in flexible sensors which have been applied into wearable electronics. However, further application of hydrogels is restricted by the ambiguity of the sensing mechanisms, and the multi-functionalization of flexible sensing systems based on hydrogels in terms of cost, difficulty in integration, and device fabrication remains a challenge, obstructing the specific application scenarios. Herein, cost-effective, structure-specialized and scenario-applicable 3D printing of direct ink writing (DIW) technology fabricated two-dimensional (2D) transition metal carbides (MXenes) bonded hydrogel sensor with excellent strain and temperature sensing performance is developed. Gauge factor (GF) of 5.7 (0 − 191% strain) and high temperature sensitivity (−5.27% °C−1) within wide working range (0 − 80 °C) can be achieved. In particular, the corresponding mechanisms are clarified based on finite element analysis and the first use of in situ temperature-dependent Raman technology for hydrogels, and the printed sensor can realize precise temperature indication of shape memory solar array hinge.

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Section: Introductionmentioning

confidence: 99%

Approaching intrinsic dynamics of MXenes hybrid hydrogel for 3D printed multimodal intelligent devices with ultrahigh superelasticity and temperature sensitivity

et al. 2022

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“…Beyond the elegant simplicity of these LM ruptureoriented self-healing techniques, researchers have investigated the diverse array of chemical cross-linking selfhealing mechanisms in different types of polymer and elastomer mixtures. 109,110,[119][120][121][122] These investigations have resulted in other promising self-healing avenues but suffer from limitations such as temperature and time requirements. However, these constraints can be justified by comparing the extent of damage this technique is designed to regenerate.…”

Section: Self-healing Electronicsmentioning

confidence: 99%

“…For instance, most LMPC-based sensors are sensitive enough to detect various bending moments or vibrations on the human body. 82,83,110 A valuable demonstration of this type of sensor is shown in Figure 12C, where researchers were able to code American Sign Language to hand gestures via a resistive sensing device. Injectionbased LMPCs can also deform with more predictability due to the simplicity of the traces, making them excellent for accurately detecting forces and pressures.…”

Section: Electronic Applicationsmentioning

confidence: 99%

Multifunctional liquid metal polymer composites

Guymon

Malakooti

2022

Journal of Polymer Science

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Liquid metal polymer composites are an emerging class of functional materials with potentially transformative impacts in wearable electronics, soft robotics, and human-computer interactions. By employing different processing methods, room temperature liquid metal inclusions can be embedded in insulating polymers like elastomers to incorporate functional properties of metals while the matrix remains soft and stretchable. These solid-liquid composites offer an interesting, yet complex multifunctional material system. In this review, we present an exclusive overview of the synthesis methods, structural and functional properties, and applications of gallium-based liquid metal polymer composites. Common methods to control the size of liquid metal inclusions and their interaction in polymers are discussed. Moreover, the effect of liquid metal microstructures on the overall properties of the composites is summarized. We also highlight the new trends in terms of material composition, printing process, and novel applications of liquid metal polymer composites in intelligent systems.

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“…[5][6][7][8] Wearable sensors can be made to transmit and display real-time human condition which has important potential application value in the diagnosis and monitoring of tremor diseases. [9][10][11][12] Therefore, it arouses people's interests to research flexible wearable sensor. [13][14][15] Up to now, various materials, especially elastic gel, have been emerged to evaluate human motion.…”

Section: Introductionmentioning

confidence: 99%

A Chewing Gum Residue‐Based Gel with Superior Mechanical Properties and Self‐Healability for Flexible Wearable Sensor

Zhao

Zeng

et al. 2022

Macromol. Rapid Commun.

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Chewing gum residue is hard to decompose and easy to cause pollution, which is highly desirable to realize recycling. In this paper, a chewing gum gel with enhanced mechanical properties and self‐healing properties is prepared by using polyvinyl alcohol (PVA) as the backbone in chewing gum residue. The hydrogen bond and the borax ester bond are employed to construct reversible interaction to enhance the self‐healing ability. The physical crosslinking is realized by further freeze‐thaw treatment to improve its mechanical properties. The gel demonstrates high elongation at break of 610% and strength of 0.11 MPa, as well as excellent self‐healing performance and recyclable properties. In particular, the gel with a fast signal response is successfully applied as a wearable strain sensor to monitor different types of human motion. The gel as a sensor exhibits self‐healing properties suggesting superior safety and stability, and displays wide linear sensitivity (the gauge factor is 0.417 and 0.170). The gel can be further served to explore temperature changes, implying the application in temperature monitoring. This study develops a novel approach for the recycle and reuse of chewing gum residue. The obtained gel may be a promising candidate for the fabrication of flexible wearable sensor.

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Self-healing, anti-freezing, adhesive and remoldable hydrogel sensor with ion-liquid metal dual conductivity for biomimetic skin

Cited by 167 publications

References 45 publications

Approaching intrinsic dynamics of MXenes hybrid hydrogel for 3D printed multimodal intelligent devices with ultrahigh superelasticity and temperature sensitivity

Approaching intrinsic dynamics of MXenes hybrid hydrogel for 3D printed multimodal intelligent devices with ultrahigh superelasticity and temperature sensitivity

Multifunctional liquid metal polymer composites

A Chewing Gum Residue‐Based Gel with Superior Mechanical Properties and Self‐Healability for Flexible Wearable Sensor

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