ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wu Bin Ying,Zhe Yu,Do Hwan Kim,Kyung Jin Lee,Han Hu,Yiwei Liu,Zhengyang Kong,Kai Wang,Jie Shang,Ruoyu Zhang,Jin Zhu,Run-Wei Li
A stretchable electronic skin (e-skin) requires a durable elastomeric matrix to serve in various conditions. Therefore, excellent and balanced properties such as elasticity, water proof capability, toughness, and self-healing are demanded. However, it is very difficult and often contradictory to optimize them at one time. Here, a polyurethane (BS-PU-3) containing a polydisperse hard segment, hydrophobic soft segment, and a dynamic disulfide bond was prepared by one-pot synthesis. Unlike the normal two-pot reaction, BS-PU-3 obtained through the one-pot method owned a higher density of self-healing points along the main chain and a faster self-healing speed, which reached 1.11 μm/min in a cut-through sample and recovered more than 93% of virgin mechanical properties in 6 h at room temperature. Moreover, a remarkable toughness of 27.5 MJ/m3 assures its durability as an e-skin matrix. Even with a 1 mm notch (half of the total width) on a standard dumbbell specimen, it could still bear the tensile strain up to 324% without any crack propagation. With polybutadiene as the soft segment, the shape, microstructure, and conductivity in BS-PU-3 and BS-PU-3-based stretchable electronics kept very stable after soaking in water for 3 days, proving the super waterproof property. An e-skin demo was constructed, and self-healing in pressure sensitivity, mechanical, and electrical properties were verified.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-10
·
IF 4.6
Zhao Xiaojiong,Tian Min,Wei Ruichao,Jiang Saihua
To improve flame retardancy of wood, a novel high-water-retention and self-healing polyvinyl alcohol/phytic acid/MXene hydrogel coating was developed through facile one-pot heating and freeze–thaw cycle methods, and then painted on wood surface. The coating exhibit excellent self-healing property and significantly enhanced water-retention property (water content ≥ 90 wt%), due to the increased hydrogen bonds within the coating system with the presence of MXene nanosheets. Compared to pristine wood, the flame retardancy of coated wood is greatly improved, such as passed V0 rating in UL-94 test, increasing time to ignition (TTI, from 32 to 69 s), and decreased heat release rate and total heat release by 41.6% and 36.14%. The cooling effect and large thermal capacity of high-water-retention hydrogel, and physical barrier effects for flammable gas products, heat and oxygen by MXene nanosheets and the compact char layer formed during combustion play key roles in the flame retardancy enhancements of the wood. High thermal stability of MXene nanosheets is another beneficial factor. The detailed flame-retardant and self-healing mechanisms were proposed.
研究领域:
材料科学
·
防火技术
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产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2024
·
IF 5.5
Xiaoyu Guo,Bin Yang,Junyi Chen
The preparation of polysaccharide-peptide hydrogels usually involves multiple synthetic steps, thus reducing the effectiveness and practicality of these approaches. Inspired by recent discoveries in aqueous N-carboxyanhydride (NCA) ring-opening polymerization (ROP) and ring-opening polymerization-induced nanogelation, we present an aqueous one-pot strategy to prepare polysaccharide-polypeptide hydrogels. In this study, water-soluble polysaccharide carboxymethyl chitosan is used as the macromolecular initiator to prepare polysaccharide-polypeptide copolymers through the aqueous ROP of NCA. The catalyst-free approach afforded hydrogels with properties that could be controlled by adjusting the type and amount of NCA used, with the elastic modulus ranging from 50 Pa to 18000 Pa. The hydrogen bond-cross-linked hydrogel exhibited self-healing and injectable properties. Morphology characterization revealed that micelles were formed in the early stage of reaction, suggesting that the polymerization follows an aqueous ring-opening polymerization-induced self-assembly (ROPISA) mechanism and that aggregation of micelles during the reaction caused the gelation. Moreover, the hydrogels displayed high swelling ratios (>95% water content), and hemolysis and cytotoxicity experiments demonstrated that the hydrogels had excellent biocompatibility, indicating their potential in medical applications.
研究领域:
材料科学
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生物医学工程
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 42
·8862-8870
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IF 6.331
Yaqing Liu,Daren Xu,Yi Ding,Xiaoxiao Lv,Tingting Huang,Bolei Yuan,Lin Jiang,Xueying Sun,Yuanqing Yao,Jun Tang
MXene is recognized as an ideal material for sensitive wearable strain sensors because of its unique advantages of conductivity, hydrophilicity and mechanical properties. However, conventional hydrogel sensors utilizing MXene as a conductive material inevitably encounter the excessive accumulation of MXene nanosheets during the process of synthesis, which limits the electron transmission, reduces the conductivity, and concurrently weakens the mechanical capability and sensitivity of sensors. Herein, we construct a dispersion-enhanced MXene hydrogel (DEMH) through a chitosan-induced self-assembly strategy for the first time. Charge transfer is carried out through the flow of a material or a collection of material microstructures, and thus the highly interconnected 3D MXene@Chitosan network provides fast transport channels for electrons, and the DEMH exhibits excellent conductivity and sensibility simultaneously. Besides, the electrostatic self-assembly between MXene and chitosan, and the supramolecular interactions between MXene, chitosan and polyacrylamide chain segment result in excellent mechanical strength (of up to 1900%) and flexibility of DEMH. Furthermore, the introduction of chitosan which possesses a high density of positively charged groups and MXene with semiconducting properties also endows sensor versatility, such as self-adhesion properties and antibacterial activity. This work develops a simple and cut-price strategy for combining MXene unaggregated into a hydrogel as a sensor with high conductivity, sensibility and flexibility. A simple and inexpensive strategy for avoiding self-stacking of two-dimensional conductive materials is proposed, which paves the way for a broad range of applications in electronic skin, human motion detection and intelligent devices.
研究领域:
材料科学
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生物医学工程
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电子皮肤研究
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xiaojia Zhang,Yingying Mu,Lijie Zhao,Yanlong Hong,Lan Shen
Biomaterials capable of achieving effective sealing and hemostasis at moist wounds are in high demand in the clinical management of acute hemorrhage . Bletilla striata polysaccharide (BSP), a natural polysaccharide renowned for its hemostatic properties, holds promising applications in biomedical fields. In this study, a dual-dynamic-bonds crosslinked hydrogel was synthesized via a facile one-pot method utilizing poly(vinyl alcohol) (PVA)-borax as a matrix system, followed by the incorporation of BSP and tannic acid (TA). Chemical borate ester bonds formed around borax , coupled with multiple physical hydrogen bonds between BSP and other components, enhanced the mechanical properties and rapid self-healing capabilities. The catechol moieties in TA endowed the hydrogel with excellent adhesive strength of 30.2 kPa on the surface of wet tissues and facilitated easy removal without residue. Benefiting from the synergistic effect of TA and the preservation of the intrinsic properties of BSP, the hydrogel exhibited outstanding biocompatibility , antibacterial, and antioxidant properties. Moreover, it effectively halted acute bleeding within 31.3 s, resulting in blood loss of 15.6 % of that of the untreated group. As a superior hemostatic adhesive, the hydrogel in this study is poised to offer a novel solution for addressing future acute hemorrhage, wound healing , and other biomedical applications.
研究领域:
生物材料学
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组织工程学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2017
·
IF 0
Hailong Fan,Jiahui Wang,Qiuya Zhang,Zhaoxia Jin
Adhesiveness of hydrogels depends on the balance and synergy of their cohesion and adhesion. However, it is a challenge to fabricate catechol-based hydrogels with high adhesiveness because the required condition for cohesion and adhesion of these hydrogels is in conflict with each other: strong cohesion (gelation) requires a weak basic condition, whereas strong adhesion requires an acidic condition. Here, we demonstrated that by utilizing polyphenol supramolecular chemistry, the coexistence of strong cohesion and adhesion can be achieved in a hydrogel via the one-pot method. Poly(dimethyl diallyl ammonium chloride)/tannic acid (PDDA/TA) hydrogel has been studied as a proof of concept. Compared with catechol moieties that covalently grafted on polymer chains, TA can bring high density of pyrogallol/catechol functional groups for polymers via a noncovalent pathway, as well as high acidity in the system. As a result, the cohesion of the hydrogel is enhanced significantly, the highest storage moduli can reach up to ca. 0.15 MPa; besides, the high acidity of the hydrogel prevents pyrogallol/catechol groups from oxidation and guarantees strong adhesion; thus, the hydrogel can adhere to diverse substrates steadily, including tissues, glass, metals, and plastic. Moreover, because of the adjustable adhesiveness via changing the pH, the PDDA/TA hydrogel becomes a unique system with patternable adhesiveness. In addition, the hydrogel has rapid self-healing and high ionic conductivity (∼4.3 S m–1). This study demonstrates that utilizing polyphenol chemistry in the construction of hydrogels opens a new path toward multifunctional hydrogels with improved properties.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
ACS Nano
·
2023
·
IF 17.1
Rui Qiu,Jiaxin Wang,Qinqi Ren,Weihong Huang,Jiahao Zhu,Dexing Liu,Xinyu Gao,Wanting Wang,Qi Liu,Min Zhang
The coexistence and interaction of excitatory and inhibitory neurotransmitters at biological synapses enable bilingual communication, serving as a physiological foundation for organism adaptation, internal stability, and regulation of behavior and emotions in mammals. Neuromorphic electronics are expected to emulate the bilingual functions of the biological nervous system for artificial neurorobotics and neurorehabilitation. Here, we have proposed a bilingual bidirectional artificial neuristor array, which utilizes ion migration and electrostatic coupling properties between intrinsically stretchable and self-healing poly(urea-urethane) elastomer and carbon nanotube electrodes, realized by van der Waals integration. The neuristor exhibits depression or potentiation behaviors in response to the same stimulus in different operational phases and achieves a four-quadrant information-processing capability. These properties make it possible to simulate complex neuromorphic processes, which involve bilingual bidirectional responses, such as withdrawal or addiction responses, and array-based automated refresh. Furthermore, the neuristor array is a self-healing neuromorphic electronic device that can function effectively even under 50% mechanical strain and can recover operation voluntarily within 2 h after experiencing mechanical injury. Additionally, the bilingual bidirectional stretchable self-healing neuristor can emulate coordinated neural signal transmission from the motor cortex to muscles and integrate proprioception through strain modulation, similar to the biological muscle spindle. The properties, structure, operation mechanisms, and neurologically integrated functions of the proposed neuristor signify an advancement in neuromorphic electronics for next-generation neurorehabilitation and neurorobotics.
研究领域:
神经科学
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材料科学
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机器人学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jia Liu,Xiaoning Ma,Yanping Tong,Meidong Lang
Ditelluride bonds have been reported as dynamic covalent bonds which could undergo reversible formation and cleavage at room-temperature. In this work, a novel self-healing ditelluride-containing polyurethane was synthesized by incorporating ditelluride bond into its main chain. Base on the dynamic nature of ditelluride bonds, this polyurethane could self-heal in darkness at room temperature without external intervention. The study on the exchange mechanism revealed that the reversible exchange of ditelluride bonds and the intermolecular hydrogen bonding were the two main factors that responsible for the self-healing behavior of this polyurethane. The ditelluride content and chain mobility of the polymer have a significant effect on its self-healing property. The unique non-intervention self-healing properties and wild applicability makes this polymers ideal for environment friendly smart systems.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 41
·19360-19366
·
IF 7.233
Shengping Dai,Xiaoshuang Zhou,Shuai Wang,Jianning Ding,Ningyi Yuan
Self-healing conductive elastomers have emerged as a class of novel materials that are important for fabricating human-motion sensors, soft robots and healthcare monitoring systems. Herein, we report on a hydrogel of modified poly(γ-glutamic) acid polymer chains crosslinked by coordination complexes, which exhibits good stretchability (1375%), long-term stability (more than 40 days), and self-healing ability (99.0 ± 1.5% in 3 h). Furthermore, a “sandwich” structure composite was fabricated, which is composed of self-healing hydrogels and Au nanograin-decorated aligned multiwall carbon nanotube sheets. It possesses fast self-healing ability, a low stable electronic resistance of 10 ± 1 Ω sq−1, in the temperature range of −40–90 °C, the humidity range of 10–90%, and a stretching range up to 200%.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 12
·1392
·
IF 2.935
Wenyan Li,Shengchang Lu,Mengchan Zhao,Xinxing Lin,Min Zhang,He Xiao,Kai Liu,Liulian Huang,Lihui Chen,Xinhua Ouyang,Yonghao Ni,Hui Wu
Self-healing gels based on reshuffling disulfide bonds have attracted great attention due to their ability to restore structure and mechanical properties after damage. In this work, self-healing gels with different cellulose nanocrystals (CNC) contents were prepared by embedding the thiuram disulfide bonds into gels via polyaddition. By the reshuffling of thiuram disulfide bonds, the CNC-containing gels repair the crack and recover mechanical properties rapidly under visible light in air. The thiuram disulfide-functionalized gels with a CNC content of 2.2% are highly stretchable and can be stretched approximately 42.6 times of their original length. Our results provide useful approaches for the preparation of dynamic CNC-containing gels with implications in many related engineering applications.Keywords:cellulose;disulfide;gel;self-healing
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2019
·
IF 3.771
Bo Wu,Zhimeng Liu,Yuan Lei,Yi Wang,Qinfeng Liu,Anqian Yuan,Yuanyang Zhao,Xi Zhang,Jingxin Lei
Achieving good transparency, high strength and superior extensibility simultaneously in autonomic self-healing elastomers remains challenging and fascinating. Herein, a complementary design strategy of combining densely distributed multiple hydrogen bonds (H bonds) and loosely packed spacer units in supramolecular elastomer was reported to address the inherent contradiction of robust strength and room temperature self-healing. The chemical structure can be tuned to achieve a good compromise between the mechanical properties and self-healing efficiency. The representative elastomers can achieve robust strength (6.81 MPa), high extensibility (2520%) and superior toughness with the dissipated energy up to 63.7 MJ/m 3 . Moreover, this elastomer is capable of recovering mechanical fractures and routine scratches with the self-healing efficiency up to 90%, which are comparable to that of room-temperature self-healable counterparts. Spacer units with steric hindrance effect can facilitate segmental motions and dynamic changes of H-bonds. Meanwhile, the randomly distributed multiple H bonds crosslinking such spacers contribute to the good mechanical performance and intriguing self-healing. In contrast to previous reports, this strategy provides an uncomplicated and cost-effective route to prepare robust elastomers that can self-heal at room temperature without any need of external assistance.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
H.T. Zheng,Y.C. Zhang,X. He,H.H. Liu,A.Y. Chen,X.F. Xie
Self-healing hydrogels exhibit special self-healing or self-recovery function like human skin after injuring, thereafter, draw lots of attention in biomedical applications. However, self-healing hydrogels with strong mechanical and rapid self-healing properties are not fully realized. MoS 2 /polyvinyl alcohol (PVA) hydrogels are developed to achieve rapid self-healing function by utilizing the excellent photothermal conversion effect of MoS 2 under near-infrared (NIR) light. Effects of microstructure and content of MoS 2 on self-healing and mechanical properties of MoS 2 /PVA hydrogels are investigated, including flower-like MoS 2 spheres by bottom-up hydrothermal reaction and MoS 2 sheets by liquid-phase stripping method. The MoS 2 /PVA hydrogels embodied with the two types of MoS 2 were produced by simple freezing/thawing method, and exhibited rapid self-healing function, together with simultaneous enhancement of strength and ductility. The MoS 2 /PVA hydrogel modified by flower-like MoS 2 spheres with a content of 0.5 wt% presents a significant self-healing function with a healing efficiency up to 90.0% within 5 min, and an enhancement of tensile strength of 9.1 MPa (190% to blank PVA) and a ductility of 162.5% (290% to blank PVA). Furthermore, the MoS 2 /PVA gel with flower-like MoS 2 spheres into the PVA networks produces a significant enhancement of fracture strength (58.4 MPa) after fully curing, characterized by an increases of 612% compared with the pure PVA. The photo-induced self-healing and strengthening effects of the MoS 2 /PVA hydrogels are discussed.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）