Highly stretchable and self-healing cellulose nanofiber-mediated conductive hydrogel towards strain sensing application

Jiao, Yue; Lu, Youcai; Lu, Kaiyue; Yue, Yiying; Xu, Xinwu; Xiao, Huining; Li, Jian

doi:10.1016/j.jcis.2021.04.001

Cited by 158 publications

(67 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to design more ideal strain-sensing materials, people often introduce various substrates and functional additives into the same hydrogel system to maximize the realization of multifunctional synergy. For example, scholars introduced conductive ions or conductive polymers − into cellulose nanofiber (CNF)-based hydrogels to prepare functional hydrogels with elasticity, stretchability, self-healing, and conductivity. Based on the high conductivity and high strain sensitivity of the prepared hydrogel, it has been used in the field of strain sensors.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing, Self-Adhesive Silk Fibroin Conductive Hydrogel as a Flexible Strain Sensor

Zheng

Nan

et al. 2021

ACS Appl. Mater. Interfaces

206

117

View full text Add to dashboard Cite

Flexible and wearable hydrogel strain sensors have attracted tremendous attention for applications in human motion and physiological signal monitoring. However, it is still a great challenge to develop a hydrogel strain sensor with certain mechanical properties and tensile deformation capabilities, which can be in conformal contact with the target organ and also have self-healing properties, self-adhesive capability, biocompatibility, antibacterial properties, high strain sensitivity, and stable electrical performance. In this paper, an ionic conductive hydrogel (named PBST) is rationally designed by proportionally mixing polyvinyl alcohol (PVA), borax, silk fibroin (SF), and tannic acid (TA). SF can not only be a reinforcement to introduce an energy dissipation mechanism into the dynamically cross-linked hydrogel network to stabilize the non-Newtonian behavior of PVA and borax but it can also act as a cross-linking agent to combine with TA to reduce the dissociation of TA on the hydrogel network, improving the mechanical properties and viscoelasticity of the hydrogel. The combination of SF and TA can improve the self-healing ability of the hydrogel and realize the adjustable viscoelasticity of the hydrogel without sacrificing other properties. The obtained hydrogel has excellent stretchability (strain > 1000%) and shows good conformal contact with human skin. When the hydrogel is damaged by external strain, it can rapidly self-repair (mechanical and electrical properties) without external stimuli. It shows adhesiveness and repeatable adhesiveness to different materials (steel, wood, PTFE, glass, iron, and cotton fabric) and biological tissues (pigskin) and is easy to peel off without residue. The obtained PBST conductive hydrogel also has a wide strain-sensing range (>650%) and reliable stability. The hydrogel adhered to the skin surface can monitor large strain movements such as in finger joints, wrist joints, knee joints, and so on and detect swallowing, smiling, facial bulging and calming, and other micro-deformation behaviors. It can also distinguish physical signals such as light smile, big laugh, fast and slow breathing, and deep and shallow breathing. Therefore, the PBST conductive hydrogel material with multiple synergistic functions has great potential as a flexible wearable strain sensor. The PBST hydrogel has antibacterial properties and good biocompatibility at the same time, which provides a safety guarantee for it as a flexible wearable strain sensor. This work is expected to provide a new way for people to develop ideal wearable strain sensors.

show abstract

Section: Introductionmentioning

confidence: 99%

Self-Healing, Self-Adhesive Silk Fibroin Conductive Hydrogel as a Flexible Strain Sensor

Zheng

Nan

et al. 2021

ACS Appl. Mater. Interfaces

206

117

View full text Add to dashboard Cite

show abstract

“…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%

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

Peymanfar

Selseleh-Zakerin

Ahmadi³

et al. 2021

Sci Rep

View full text Add to dashboard Cite

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.

show abstract

“…It was revealed that the self‐healing efficiency based on tensile strength and strain of the hydrogels with different BNNS‐NH 2 contents were all above 90% and the self‐healing time was only 10 min exhibited highly efficient self‐healing property which is much faster than the published works. [ 38–40 ] Benefiting from the highly efficient self‐healing property, the hydrogel displayed excellent shapeability. The significant feature made the hydrogel enable to shape and reshape easily realizing the recycling.…”

Section: Resultsmentioning

confidence: 99%

Boron Nitride Nanosheets Strengthened PVA/Borax Hydrogels with Highly Efficient Self‐Healing and Rapid pH‐Driven Shape Memory Effect

Xue

Liu

Lai

et al. 2021

Macro Materials & Eng

View full text Add to dashboard Cite

Self‐healing hydrogels often possess poor mechanical properties which largely limits their applications in many fields. In this work, boron nitride nanosheets are introduced into a network of the poly(vinyl alcohol)/borax (PVA/borax) hydrogels to enhance the mechanical properties of the hydrogel without compromising the self‐healing abilities. The obtained hydrogels exhibit excellent mechanical properties with a tensile strength of 0.410 ± 0.007 MPa, an elongation at break of 1712%, a Young's Modulus of 0.860 ± 0.023 MPa, and a toughness of 3.860 ± 0.075 MJ m−3. In addition, the self‐healing efficiency of the hydrogels is higher than 90% within 10 min at room temperature. Benefiting from the excellent self‐healing properties, the shapeability of the hydrogel fragments is observed using different molds. In addition, the hydrogels display rapid pH‐driven shape memory effects and can recover to their original shape within 260 s. Overall, this work provides a new approach to hydrogels with integrated excellent mechanical properties, self‐healing abilities, and rapid pH‐driven shape memory effects.

show abstract

Highly stretchable and self-healing cellulose nanofiber-mediated conductive hydrogel towards strain sensing application

Cited by 158 publications

References 57 publications

Self-Healing, Self-Adhesive Silk Fibroin Conductive Hydrogel as a Flexible Strain Sensor

Self-Healing, Self-Adhesive Silk Fibroin Conductive Hydrogel as a Flexible Strain Sensor

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

Boron Nitride Nanosheets Strengthened PVA/Borax Hydrogels with Highly Efficient Self‐Healing and Rapid pH‐Driven Shape Memory Effect

Contact Info

Product

Resources

About