TEMPO-oxidized cellulose nanofibers/polyacrylamide hybrid hydrogel with intrinsic self-recovery and shape memory properties

Lu, Youcai; Han, Jingquan; Ding, Qinqin; Xia, Changlei; Ge, Shengbo; Le, Quyet Van; Dou, Xiaomin; Sonne, Christian; Lam, Su Shiung

doi:10.1007/s10570-020-03606-8

Cited by 78 publications

(45 citation statements)

References 71 publications

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“…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

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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.

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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

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“…On the other hand, BNNS‐NH 2 passivated the tips of cracks and obstructed the extension of cracks protecting the hydrogel from macrodamage exhibiting the remarkable mechanical property. [ 26–30 ] The stress of PB x ‐hydrogel decreased with the strain increasing even touched the bottom at break which was attributed to the relaxation of PVA chains and the limited service life of reversible bonds like dynamic borate bonds which was easily broken during stretching process. Therefore, the reversible bonds were broken and rebuilt during deformation.…”

Section: Resultsmentioning

confidence: 99%

“…The large improvement of Young's Modulus was ascribed to the introduction of BNNS‐NH 2 impeded the growth of cracks and blunted the points of the cracks protecting the hydrogel from macrodestruction. [ 28–30 ] On the other hand, BNNS‐NH 2 dispersed in the network of PB x ‐hydrogel reinforcing the stiffness of the hydrogel not only attributing to the excellent mechanical property of BNNS‐NH 2 , but also owing to the synergy of PVA chains between BNNS‐NH 2 . [ 26,27 ] Further improving the concentration of BNNS‐NH 2 , the stiffness of PB x ‐hydrogel was reduced instead because the excess BNNS‐NH 2 were reunited in the network generating the impediment of the polymer chains under stretching leading to the dropping off of stiffness.…”

Section: Resultsmentioning

confidence: 99%

“…Although the mechanical property of the PVA/BNNS‐NH 2 hydrogel is a bit ordinary compared with the elastomers and hydrogels without self‐healing ability, it is great among the self‐healing hydrogels. [ 13,14,29,30 ] The hydrogel with such great mechanical property also displayed excellent self‐healing capacity owing to the reversible crosslinking network through dynamic borate bonds. As shown in Scheme , the dynamic borate bonds were disconnected after damaging, while the dynamic borate bonds were re‐established after putting together at room temperature for 10 min, exhibiting the extraordinary self‐healing capability.…”

Section: Resultsmentioning

confidence: 99%

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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

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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.

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“…The use of nanocellulosic materials in obtaining hydrogels from renewable materials has been a much-desired goal that has been achieved for many hydrogel types [ 47 , 48 , 49 ]. Several smart hydrogels such as injectable hydrogels [ 33 , 50 , 51 ], shape memory [ 52 , 53 ], supramolecular hydrogels [ 54 , 55 ], double-membrane hydrogels [ 56 ], temperature-sensitive hydrogels [ 57 ], and many other hydrogels types based on nanocellulose with potential for biomedical applications have been developed.…”

Section: Advanced Functional Materials Based On Nanocellulose—general Characteristicsmentioning

confidence: 99%

Advanced Functional Materials Based on Nanocellulose for Pharmaceutical/Medical Applications

Nicu¹,

Ciolacu

Ciolacu³

2021

Pharmaceutics

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Nanocelluloses (NCs), with their remarkable characteristics, have proven to be one of the most promising “green” materials of our times and have received special attention from researchers in nanomaterials. A diversity of new functional materials with a wide range of biomedical applications has been designed based on the most desirable properties of NCs, such as biocompatibility, biodegradability, and their special physicochemical properties. In this context and under the pressure of rapid development of this field, it is imperative to synthesize the successes and the new requirements in a comprehensive review. The first part of this work provides a brief review of the characteristics of the NCs (cellulose nanocrystals—CNC, cellulose nanofibrils—CNF, and bacterial nanocellulose—BNC), as well as of the main functional materials based on NCs (hydrogels, nanogels, and nanocomposites). The second part presents an extensive review of research over the past five years on promising pharmaceutical and medical applications of nanocellulose-based materials, which have been discussed in three important areas: drug-delivery systems, materials for wound-healing applications, as well as tissue engineering. Finally, an in-depth assessment of the in vitro and in vivo cytotoxicity of NCs-based materials, as well as the challenges related to their biodegradability, is performed.

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TEMPO-oxidized cellulose nanofibers/polyacrylamide hybrid hydrogel with intrinsic self-recovery and shape memory properties

Cited by 78 publications

References 71 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

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

Advanced Functional Materials Based on Nanocellulose for Pharmaceutical/Medical Applications

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