Hydroxyethyl cellulose-based electrically conductive, mechanically resistant, strain-sensitive self-healing hydrogels

Hussain, Imtiaz; Ma, Xiaofeng; Wu, Linlin; Luo, Zhenyang

doi:10.1007/s10570-022-04622-6

Cited by 13 publications

(5 citation statements)

References 50 publications

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“…Notably, the conductivity of the PNSAX double cross-linked hydrogel reached 0.43 S/m, which was comparable and even superior to the multifunctional conductive hydrogels reported recently. 70,71 Moreover, considering that the hydrogel possessed excellent stretchability and the conductivity of hydrogel might change during strain, the hydrogel might exhibit strain-sensitive conductivity. 64 To investigate the strainsensitive conductivity of the PNSAX double cross-linked hydrogel, both the qualitative test and the quantitative test were carried out.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Multistimuli-Responsive PNIPAM-Based Double Cross-Linked Conductive Hydrogel with Self-Recovery Ability for Ionic Skin and Smart Sensor

et al. 2022

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Multistimuli-responsive conductive hydrogels have been appealing candidates for multifunctional ionic skin. However, the fabrication of the multistimuli-responsive conductive hydrogels with satisfactory mechanical property to meet the practical applications is still a great challenge. In this study, a novel poly(N-isopropylacrylamide-co-sodium acrylate)/alginate/hectorite clay Laponite XLS (PNIPAM-SA/ALG/XLS) double cross-linked hydrogel with excellent mechanical property, self-recovery ability, temperature/pH-responsive ability, and strain/temperature-sensitive conductivity was fabricated. The PNSAX hydrogel possessed a moderate tensile strength of 290 kPa at a large elongation rate of 1120% and an excellent compression strength of 2.72 MPa at 90%. The hydrogel also possessed excellent mechanical repeatability and self-recovery ability. Thus, the hydrogel could withstand repetitive deformations for long time periods. Additionally, the hydrogel could change its transparency and volume once at a temperature of 44 °C and change its volume at different pHs. Thus, the visual temperature/pH-responsive ability allowed the hydrogel to qualitatively harvest environmental information. Moreover, the hydrogel possessed an excellent conductivity of 0.43 S/m, and the hydrogel could transform large/subtle deformation and temperature information into electrical signal change. Thus, the ultrafast strain/temperature-sensitive conductivity allowed the hydrogel to quantitatively detect large/small-scale human motions as well as environmental temperature. A cytotoxicity test confirmed the good cytocompatibility. Taken together, the hydrogel was suitable for human motion detecting and environmental information harvesting for long time periods. Therefore, the hydrogel has a great application potential as a multifunctional ionic skin and smart sensor.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Multistimuli-Responsive PNIPAM-Based Double Cross-Linked Conductive Hydrogel with Self-Recovery Ability for Ionic Skin and Smart Sensor

et al. 2022

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“…And absorption peak at 1330 cm –1 is related to C–H bending vibration of the primary alcohol (−CHOH−). Moreover, the vibrational band at 1061 cm –1 is assigned to the C–O stretching vibration. , The FT-IR spectra of MoS 2 /HEC contain all the characteristic peaks of MoS 2 and HEC, which further proves the successful preparation of MoS 2 /HEC.…”

Section: Resultsmentioning

confidence: 67%

Flexible Pressure Sensors Based on Molybdenum Disulfide/Hydroxyethyl Cellulose/Polyurethane Sponge for Motion Detection and Speech Recognition Using Machine Learning

Chen

Zhang

Luan

et al. 2022

ACS Appl. Mater. Interfaces

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Flexible pressure sensors with excellent performance have broad application potential in wearable devices, motion monitoring, and human−computer interaction. In this paper, a flexible pressure sensor with a porous structure is proposed by coating molybdenum disulfide (MoS 2 ) and hydroxyethyl cellulose (HEC) on a polyurethane (PU) sponge skeleton. The obtained sensor has excellent sensitivity (0.746 kPa −1 ), a wide detection range (250 kPa), fast response (120 ms), and outstanding repeatability over 2000 cycles. It is proven that the sensor can realize human motion detection and distinguish the touch of varying strength. In addition, a pressure sensing array was fabricated to reflect the pressure distribution and recognize the writing of Arabic numerals. Finally, the sensor performs speech detection through throat muscle movements, and high-accuracy (97.14%) speech recognition for seven words was achieved by a machine learning algorithm based on the support vector machine (SVM). This work provides an opportunity to fabricate simple flexible pressure sensors with potential applications in next-generation electronic skin, health detection, and intelligent robotics.

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“…The strain-induced resistance change of the IHPS unit was different compared with an ideal electroconductive resistor. This phenomenon might be caused by the inhomogeneous elongation of four types of hydrogels with different initial ion concentration and ion-selective efficiency in one unit 27 , 28 , which still necessitates a comprehensive investigation in the future. Besides, during cyclic stretching testing, the consecutively-printed IHPS unit exhibited relatively stable voltage output, which showed a reduction of 2.52% after undergoing 1000 cycles of stretching-and-releasing (ε l = 100%) for 120 min (Fig.…”

Section: Resultsmentioning

confidence: 99%

Consecutive multimaterial printing of biomimetic ionic hydrogel power sources with high flexibility and stretchability

He,

Yue,

Qiu

et al. 2024

Nat Commun

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Electric eel is an excellent example to harness ion-concentration gradients for sustainable power generation. However, current strategies to create electric-eel-inspired power sources commonly involve manual stacking of multiple salinity-gradient power source units, resulting in low efficiency, unstable contact, and poor flexibility. Here we propose a consecutive multimaterial printing strategy to efficiently fabricate biomimetic ionic hydrogel power sources with a maximum stretchability of 137%. The consecutively-printed ionic hydrogel power source filaments showed seamless bonding interface and can maintain stable voltage outputs for 1000 stretching cycles at 100% strain. With arrayed multi-channel printhead, power sources with a maximum voltage of 208 V can be automatically printed and assembled in parallel within 30 min. The as-printed flexible power source filaments can be woven into a wristband to power a digital wristwatch. The presented strategy provides a tool to efficiently produce electric-eel-inspired ionic hydrogel power sources with great stretchability for various flexible power source applications.

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Hydroxyethyl cellulose-based electrically conductive, mechanically resistant, strain-sensitive self-healing hydrogels

Cited by 13 publications

References 50 publications

Multistimuli-Responsive PNIPAM-Based Double Cross-Linked Conductive Hydrogel with Self-Recovery Ability for Ionic Skin and Smart Sensor

Multistimuli-Responsive PNIPAM-Based Double Cross-Linked Conductive Hydrogel with Self-Recovery Ability for Ionic Skin and Smart Sensor

Flexible Pressure Sensors Based on Molybdenum Disulfide/Hydroxyethyl Cellulose/Polyurethane Sponge for Motion Detection and Speech Recognition Using Machine Learning

Consecutive multimaterial printing of biomimetic ionic hydrogel power sources with high flexibility and stretchability

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