A stretchable, self-healing conductive hydrogels based on nanocellulose supported graphene towards wearable monitoring of human motion

Chen, Zheng; Lu, Kaiyue; Lu, Youcai; Zhu, Sailing; Yue, Yiying; Xu, Xinwu; Mei, Changtong; Xiao, Huining; Wu, Qinglin

doi:10.1016/j.carbpol.2020.116905

Cited by 199 publications

(74 citation statements)

References 63 publications

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“…Noticeably, the self-healing hydrogels were wholly merged. It is noteworthy that the self-healing time of the tailored self-healing hydrogels is so lower than that of polyacrylic acid-based self-healing structures 40 , 41 , 47 , 48 . This spontaneous phenomenon is originated from diffusion and permeation at fractured interfaces, generated from the molecular dynamics reviving inter- and intramolecular hydrogen bonds, healing cross-links, and leading to more and more entanglements of the polymers 28 , 29 , 31 – 33 .…”

Section: Resultsmentioning

confidence: 96%

“…Figure 3 presents FTIR spectrum of the samples. The assigned peak at 3400 and 1636 cm −1 are respectively ascribed to the stretching and bending vibrations of the hydroxyl functional groups existing in the hydrogel meanwhile the peaks at 2920 and 2850, and 802 cm −1 are related to the symmetric and asymmetric stretching vibrations as well as out-of-plane bending vibrations of C–H functional groups 14 , 18 , 31 , 33 , 40 , 41 . Besides, the observed peaks at 1419, 1273, 1109, and bump at 716 cm −1 are associated with the stretching vibrations of B–O and C–O derivates including B–O–C, B–O–H, C–O–H, and C–O–B, as well as deformation vibration of O–B–O in the borate networks 42 – 46 .…”

Section: Resultsmentioning

confidence: 99%

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Preparation of self-healing hydrogel toward improving electromagnetic interference shielding and energy efficiency

Peymanfar

Selseleh-Zakerin

Ahmadi³

et al. 2021

Sci Rep

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In this study, a self-healing hydrogel was prepared that is transparent to visible (Vis) light while absorbing ultraviolet (UV), infrared (IR), and microwave. The optothermal features of the hydrogel were explored by monitoring temperature using an IR thermometer under an IR source. The hydrogel was synthesized using sodium tetraborate decahydrate (borax) and polyvinyl alcohol (PVA) as raw materials based on a facile thermal route. More significantly, graphene oxide (GO) and graphite-like carbon nitride (g-C3N4) nanostructures as well as carbon microsphere (CMS) were applied as guests to more dissect their influence on the microwave and optical characteristics. The morphology of the fillers was evaluated using field emission scanning electron microscopy (FE-SEM). Fourier transform infrared (FTIR) attested that the chemical functional groups of the hydrogel have been formed and the result of diffuse reflection spectroscopy (DRS) confirmed that the hydrogel absorbs UV while is transparent in Vis light. The achieved result implied that the hydrogel acts as an essential IR absorber due to its functional groups desirable for energy efficiency and harvesting. Interestingly, the achieved results have testified that the self-healing hydrogels had the proper self-healing efficiency and self-healing time. Eventually, microwave absorbing properties and shielding efficiency of the hydrogel, hydrogel/GO, g-C3N4, or CMS were investigated, demonstrating the salient microwave characteristics, originated from the established ionic conductive networks and dipole polarizations. The efficient bandwidth of the hydrogel was as wide as 3.5 GHz with a thickness of 0.65 mm meanwhile its maximum reflection loss was 75.10 dB at 14.50 GHz with 4.55 mm in thickness. Particularly, the hydrogel illustrated total shielding efficiency (SET) > 10 dB from 1.19 to 18 and > 20 dB from 4.37 to 18 GHz with 10.00 mm in thickness. The results open new windows toward improving the shielding and energy efficiency using practical ways.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Preparation of self-healing hydrogel toward improving electromagnetic interference shielding and energy efficiency

Peymanfar

Selseleh-Zakerin

Ahmadi³

et al. 2021

Sci Rep

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show abstract

“…Compared with the unoxidized cellulose, the spectra of TOCNs and Ca 2+ -TOCN exhibited asymmetric -OCO-stretching bands at 1607 and 1604 cm − 1 , respectively. In the spectra of unoxidized cellulose and H + -TOCN, the bands of 1645 cm − 1 and 1636 cm − 1 were attributed to the absorption of the water which was not completely dried in the nanocellulose (Yue et al 2019;Zheng et al 2020). In addition, H + -TOCN exhibited a new characteristic absorption band at 1724 cm − 1 which was attributed to the vibration absorption band of -COOH.…”

Section: Structures Of Ionic Conductive Tocn Hydrogelsmentioning

confidence: 99%

Antifreezing ionotronic skin based on flexible, transparent, and tunable ionic conductive nanocellulose hydrogels

Zhu

Xie

et al. 2021

Cellulose

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Ionic hydrogels with excellent exibility and good conductivity have great potential in diverse electric devices. However, it remains challenging to improve the biocompatibility of ionic hydrogels. Here, natural and environment-friendly cellulose nano ber hydrogels were prepared without adding any organic active materials. The cellulose hydrogel networks with free metal ions (Li + /Ca 2+ /K + ) were obtained by soaking in ion aqueous solution of different concentrations in order to endow tunable conductivity, thus a new kind of transparent ionic hydrogels with both excellent sensing performance obtained by a simple, lowcost and harmless process. The free metal ions locked in the negatively charged nanocellulose network through electrostatic interaction provided adjustable conductivity and sensing performance. Hydrogels doped with 4 mol L − 1 lithium ions exhibited the best sensing performance with the conductivity of 4.36×10 − 4 S cm − 1 , and the current response value was as high as 127%. It was worth noting that the strain-sensitive performance of calcium ions was generally excellent even at low temperatures (-30°C).The antifreezing of the hydrogel improved its service under extreme environment. This kind of hydrogel has great application prospects in arti cial intelligence products, such as human healthy monitoring equipment and soft robotics at subzero temperature.

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“…[5][6][7] The intrinsic selfhealing materials based on reversible chemical bonds including covalent and noncovalent bonds have attracted increasing attention. [8][9][10][11] Many researchers [12][13][14] have designed and synthesized elastomer with excellent self-healing effect. Zhang 15 designed a novel glycidyl-terminated alkoxyamine, which could be repeatedly healed in the air without heating.…”

Section: Introductionmentioning

confidence: 99%

A conductive rubber with self‐healing ability enabled by metal‐ligand coordination

Xiong

Gong

Ding

et al. 2021

Polymers for Advanced Techs

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At present, flexible conductive materials have been widely noticed. However, developing electronic materials with both good mechanical and electrical self-healing abilities remains both a great challenge and an exciting goal. Herein, we prepared a commercial nitrile butadiene rubber (NBR) with electrical healing capability based on constructing Fe(III) coordination and CNT networks. With 3 phr (parts per hundreds of rubber) CNT, the tensile strength and the elongation at break of rubber composite reached 1.1 MPa and 300%, respectively. After healing at 80 C for 9 hours, the recovery efficiency of rubber composite achieved 90%. After adding 5 phr CNT, the conductivity can reach 0.077 S/m, and the electrical conductivity was 0.076 S/m after self-healing. Such material can maintain resistance change within 5 times at high strain (100%), so it is applicable in the field of strain sensor.

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A stretchable, self-healing conductive hydrogels based on nanocellulose supported graphene towards wearable monitoring of human motion

Cited by 199 publications

References 63 publications

Preparation of self-healing hydrogel toward improving electromagnetic interference shielding and energy efficiency

Preparation of self-healing hydrogel toward improving electromagnetic interference shielding and energy efficiency

Antifreezing ionotronic skin based on flexible, transparent, and tunable ionic conductive nanocellulose hydrogels

A conductive rubber with self‐healing ability enabled by metal‐ligand coordination

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