Temperature‐Stress Bimodal Sensing Conductive Hydrogel‐Liquid Metal by Facile Synthesis for Smart Wearable Sensor

Wang, Chen; Li, Jie; Fang, Zhaozhou; Hu, Zhirui; Wei, Xiaotong; Cao, Yang; Han, Jing; Li, Yingchun

doi:10.1002/marc.202100543

Cited by 38 publications

(45 citation statements)

References 53 publications

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“…Moreover, cross-linking including physical 25 and chemical 26 could not only have an effect on the molecular structure, 27 molecular weight and crystallization etc, but also play a vital role in the mechanical properties of the material improved. 28 Senri Hayashi 29 used bis(furfuryl alcohol) cross-linked succinic anhydride to polymerize poly(diphenyl succinate) (PBFS), which made its relaxation temperature and mechanical strength improved.…”

Section: Introductionmentioning

confidence: 99%

Effects of the species of crosslinking reagents on the structures and properties of biodegradable poly (butanediol sebacate ‐ butanediol terephthalate) copolyester

et al. 2022

J of Applied Polymer Sci

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In the present study, poly(butylene sebacate-co-terephthalate)s having different crosslinking reagents were synthesized with a random distribution by a two-step esterification and one-step polycondensation process. In detail, the using crosslinking agents were included trimethylolethane (TME), trimethylolpropane, tris(hydroxymethyl)aminoethane, glycerol (GL). Particularly, CS refers to a sample with no crosslinking agent added. The copolyester with TME was the least crystalline sample, and the melting peaks of all copolyesters corresponding to both, sebacate and terephthalate-rich phases were still observable in second calorimetric heating runs. These copolyesters were associated with interesting thermal and mechanical properties. The melting points of all samples were higher than 118 C and the puncture resistance and tensile strength of GL, the tear strength of TME, and the Young's modulus of all samples have been improved. Enzymatic degradability was assessed and the effect of composition and crystallinity on the degradation rate was investigated. The copolyester adding GL appears as a highly promising biodegradable material since it showed a significant weight loss during exposure to all selected degradation media, but also exhibited good performance and properties that were comparable to those characteristic of polyethylene. In brief, the improvement of PBSeT's puncture resistance, tear strength, and degradation performance is extremely important for the development and promotion of degradable foam, film, and elastomer materials.poly (butanediol sebacate -butanediol terephthalate), species of crosslinking reagents, structures and properties

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Section: Introductionmentioning

confidence: 99%

Effects of the species of crosslinking reagents on the structures and properties of biodegradable poly (butanediol sebacate ‐ butanediol terephthalate) copolyester

et al. 2022

J of Applied Polymer Sci

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“…Composite Hydrogel. According to our previous research, 1,36 HACC can be chemically cross-linked with epichlohydrin (Figure 1a), while at the same time hydrogen bonds are formed due to the addition of glycerol in the process of concentration. A dense three-dimensional network structure of CHACC is formed by chemical and physical cross-linking (Figure 1a).…”

Section: Structural Design and Preparation Strategy Ofmentioning

confidence: 74%

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Wei

et al. 2022

ACS Appl. Mater. Interfaces

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Conductive hydrogels have attracted attention because of their wide application in wearable devices. However, it is still a challenge to achieve conductive hydrogels with high sensitivity and wide frequency band response for smart wearable strain sensors. Here, we report a composite hydrogel with piezoresistive and piezoelectric sensing for flexible strain sensors. The composite hydrogel consists of cross-linked chitosan quaternary ammonium salt (CHACC) as the hydrogel matrix, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) as the conductive filler, and poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) as the piezoelectric filler. A one-pot thermoforming and solution exchange method was used to synthesize the CHACC/PEDOT: PSS/PVDF-TrFE hydrogel. The hydrogel-based strain sensor exhibits very high sensitivity (GF: 19.3), fast response (response time: 63.2 ms), and wide frequency range (response frequency: 5−25 Hz), while maintaining excellent mechanical properties (elongation at break up to 293%). It can be concluded that enhanced strain-sensing properties of the hydrogel are contributed to both greater change in the relative resistance under stress and wider response to dynamic and static stimulus by adding PVDF-TrFE. This has a broad application in monitoring human motion, detecting subtle movements, and identifying object contours and a hydrogel-based array sensor. This work provides an insight into the design of composite hydrogels based on piezoelectric and piezoresistive sensing with applications for wearable sensors.

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“…d) Comparison of HM-2 sensor with other reported hydrogel strain sensors in terms of maximal strain and gauge factor. [49,59,[66][67][68][69][70][71][72][73][74][75][76] e) Response time and recovery time of the HM-2 strain sensor. f) Electrical hysteresis of HM-2 at a strain of 50%.…”

Section: Sensing Performance As Tactile and Wearable Sensorsmentioning

confidence: 99%

“…c) The resistance changes of HM-2 at the strain of 100-1500%. d) Comparison of HM-2 sensor with other reported hydrogel strain sensors in terms of maximal strain and gauge factor [49,59,[66][67][68][69][70][71][72][73][74][75][76]. e) Response time and recovery time of the HM-2 strain sensor.…”

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confidence: 99%

Highly Stretchable Hydrogels as Wearable and Implantable Sensors for Recording Physiological and Brain Neural Signals

et al. 2022

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Recording electrophysiological information such as brain neural signals is of great importance in health monitoring and disease diagnosis. However, foreign body response and performance loss over time are major challenges stemming from the chemomechanical mismatch between sensors and tissues. Herein, microgels are utilized as large crosslinking centers in hydrogel networks to modulate the tradeoff between modulus and fatigue resistance/stretchability for producing hydrogels that closely match chemomechanical properties of neural tissues. The hydrogels exhibit notably different characteristics compared to nanoparticles reinforced hydrogels. The hydrogels exhibit relatively low modulus, good stretchability, and outstanding fatigue resistance. It is demonstrated that the hydrogels are well suited for fashioning into wearable and implantable sensors that can obtain physiological pressure signals, record the local field potentials in rat brains, and transmit signals through the injured peripheral nerves of rats. The hydrogels exhibit good chemomechanical match to tissues, negligible foreign body response, and minimal signal attenuation over an extended time, and as such is successfully demonstrated for use as long-term implantable sensory devices. This work facilitates a deeper understanding of biohybrid interfaces, while also advancing the technical design concepts for implantable neural probes that efficiently obtain physiological information.

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Temperature‐Stress Bimodal Sensing Conductive Hydrogel‐Liquid Metal by Facile Synthesis for Smart Wearable Sensor

Cited by 38 publications

References 53 publications

Effects of the species of crosslinking reagents on the structures and properties of biodegradable poly (butanediol sebacate ‐ butanediol terephthalate) copolyester

Effects of the species of crosslinking reagents on the structures and properties of biodegradable poly (butanediol sebacate ‐ butanediol terephthalate) copolyester

Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE

Highly Stretchable Hydrogels as Wearable and Implantable Sensors for Recording Physiological and Brain Neural Signals

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