Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 15
·8038-8047
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IF 11.9
Bingyan Guo,Yukuan Wu,Shaoshuai He,Changyong Wang,Mengmeng Yao,Qingyu Yu,Xiaojun Wu,Chaojie Yu,Min Liu,Lei Liang,Zhongming Zhao,Yuwei Qiu,Fanglian Yao,Hong Zhang,Junjie Li
In the field of flexible electronic devices, conductive hydrogels have attracted great attention. However, it is difficult for existing hydrogel materials to realize excellent mechanical properties and high electrical conductivity simultaneously. To address this issue, this study proposes a facile method for producing super-strong conductive hydrogels via mechanical stretching combined with the Hofmeister effect. The anisotropic hydrogels possess highly anisotropic structures, which provide anisotropic mechanical properties and electrical conductivity. The prepared anisotropic hydrogels exhibit a combination of high strength (16.57 MPa), ultra-high toughness (39.23 MJ m−3), and high conductivity (0.38 S m−1), which are better than those of the anisotropic hydrogel along the vertical stretching direction and the isotropic hydrogel. And thus, the anisotropic hydrogels achieve a remarkable gauge factor (GF = 1.17). The anisotropic hydrogels demonstrate superior capabilities in human motion sensing. The excellent mechanical properties and high conductivity of anisotropic hydrogels make them a potential candidate for flexible electronic materials.
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
POLYMER
·
2024
·
IF 4.1
Qingchen Lu,Xiaoming Zhang,Yexiong Qi,Haibo Yuan,Guoli Li
Polyvinyl alcohol (PVA) has excellent physical and chemical properties; however, its rigidity easily leads to brittleness and breakage during use. Additionally, due to intramolecular hydrogen bonding, the dense structure of the film limits its application. This research used a self-toughening approach by homogeneously blending PVA 0588 and PVA 0499 with different molecular weights to enhance the toughness of PVA and create a porous structure for broader application in membrane separation. Porous PVA membranes were then produced through mechanical stretching. Rheological testing, differential scanning calorimetry, and dynamic thermomechanical analysis confirmed that the blend system is partially compatible. Mechanical characterization revealed that adding PVA 0499 decreased the tensile modulus, strength, and bending modulus of the blended film but increased the elongation at break, reaching a maximum of 179 %. This result indicates that homogeneous blending effectively achieved PVA self-toughening. After this, the PVA blended membrane underwent mechanical stretching. Results showed that the stretched membrane developed a porous structure with a PVA 0588 content of 60 wt%, yielding a pure water flux of 70.3 L m −2 h −1 MPa −1 and a glucan rejection rate of 91.07 %. The molecular weight cut-off test demonstrated that the resulting porous membrane was suitable for water treatment, effectively filtering substances with a molecular weight of ≥70 kDa. The membrane also exhibited notable antifouling properties. The hydrophilicity and high roughness of the porous membrane facilitated the formation of additional hydrogen bonds between the membrane surface and water molecules, thereby reducing direct contact between pollutants and the membrane surface. This study provides preliminary theoretical and experimental insights into enhancing PVA toughness and expanding its applications in membrane separation. Furthermore, homogeneous blending opens new avenues for improving the mechanical performance of polymers.
研究领域:
材料科学
·
化学工程
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环境工程
·
高分子科学
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产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 6
·996-1002
·
IF 4.803
Zhang Changgeng,Zhang Qi
Recent advances in novel electroactive devices have placed new requirements on material development. High-performance dielectric elastomers with good mechanical stretchability and high dielectric constant are under high demand. However, the current strategy for fabricating these materials suffers from high cost or low thermal stability, which greatly hinders large-scale industrial production. Herein, we have successfully developed a novel strategy for improving the dielectric constant of polymeric elastomers via deep eutectic solvent inclusion by taking advantage of the low cost, convenient and environmentally benign synthesis process and high ionic conductivity from deep eutectic solvents. The as-prepared composite elastomers showed good stretchability and a greatly enhanced dielectric constant with a negligible increase in dielectric dissipation. Moreover, we have proven the universality of our strategy by using different types of deep eutectic solvents. It is believed that low-cost, easy-synthesis and environmentally friendly deep eutectic solvents including composite elastomers are highly suitable for large-scale industrial production and can greatly broaden the application fields of dielectric elastomers.
研究领域:
材料科学
·
电活性设备
·
聚合物科学
✓ 已验证
DOI
高影响因子
CELL PROLIFERATION
·
2023
·
IF 8.5
Guanhui Cai,Yahui Lu,Weijie Zhong,Ting Wang,Yingyi Li,Xiaolei Ruan,Hongyu Chen,Lian Sun,Zhaolan Guan,Gen Li,Hengwei Zhang,Wen Sun,Minglong Chen,Wei-Bing Zhang,Hua Wang
Macrophages are multifunctional immune system cells that are essential for the mechanical stimulation-induced control of metabolism. Piezo1 is a non-selective calcium channel expressed in multifarious tissues to convey mechanical signals. Here, a cellular model of tension was used to study the effect of mechanical stretch on the phenotypic transformation of macrophages and its mechanism. An indirect co-culture system was used to explore the effect of macrophage activation on bone marrow mesenchymal stem cells (BMSCs), and a treadmill running model was used to validate the mechanism in vivo for in vitro studies. p53 was acetylated and deacetylated by macrophages as a result of mechanical strain being detected by Piezo1. This process is able to polarize macrophages towards M2 and secretes transforming growth factor-beta (TGF-β1), which subsequently stimulates BMSCs migration, proliferation and osteogenic differentiation. Knockdown of Piezo1 inhibits the conversion of macrophages to the reparative phenotype, thereby affecting bone remodelling. Blockade of TGF-β I, II receptors and Piezo1 significantly reduced exercise-increased bone mass in mice. In conclusion, we showed that mechanical tension causes calcium influx, p53 deacetylation, macrophage polarization towards M2 and TGF-β1 release through Piezo1. These events support BMSC osteogenesis.
研究领域:
免疫学
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细胞生物学
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力学生物学
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骨生物学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2023
·
IF 4.7
Hui Zhi,Fengya Wang,Xiaobo Zhang,Qinxin Cai,Meng Chen,Yushu Shi,Liang Feng
Traditional hydrogel dressings generally have poor mechanical properties and stability when subjected to external stress due to the undesirable chain entanglement structure of their single valence bond compositions. Therefore, it is particularly important to develop a type of gel dressing with good mechanical strength, stability, and environment-friendly monitoring. In this work, a transparent, pH-sensitive, highly stretchable, and biocompatible anthocyanidin ionogel dressing was prepared, realizing green and accurate detection. Attributed to the antibacterial activity of the ionic liquid, the biocompatibility of the pectin, and the ability to scavenge free radicals of the anthocyanidin, the ionogel dressing exhibited excellent re-epithelialization in the 14 day wound healing process. Besides, changes in pH values monitoring of the ionogel over 3 days coincided with normal wound exudate. The obtained ionogel also showed good water retention, swelling properties, mechanical stretchability, and 5 week stability, illustrating great potential in wound dressings.
研究领域:
材料科学
·
生物医学工程
·
伤口护理
✓ 已验证
DOI
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-8
·
IF 11.878
Li Huili,Lv Tian,Sun Huanhuan,Qian Guiju,Li Ning,Yao Yao,Chen Tao
Due to inherently poor healable and stretchable features, the most explored polyvinyl alcohol-based gel electrolytes cannot well meet the requirements of stretchable, healable and multifunctional supercapacitors. Here, we report a hydrogel of a copolymer cross-linked by double linkers of Laponite (synthetic hectorite-type clay) and graphene oxide. The resultant hydrogel shows high mechanical stretchability, excellent ionic conductivity, and superior healable performance. Along with designing wrinkled-structure electrodes, supercapacitors fabricated by using this hydrogel as a gel electrolyte not only exhibit ultrahigh mechanical stretchability of 1000%, but also achieve repeated healable performance under treatments of both infrared light irradiation and heating. More significantly, a broken/healed supercapacitor also possesses an ultrahigh stretchability up to 900% with slight performance decay. This hydrogel electrolyte could be easily functionalized by introducing other functional components, and extended for use in other portable and wearable energy related devices with multifunction.
研究领域:
材料科学
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电化学
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纳米技术
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 34
·16148-16159
·
IF 3.3
Jie Ren,Minmin Zhang,Meng Li,Ruirui Li,Yan Li,Wu Yang
Conductive hydrogels have attracted the attention of researchers due to their similarity to biological tissues and potential application in flexible wearable electronic devices. However, fabrication of hydrogels with high sensitivity in combination with mechanical stretchability and biocompatibility via a simple method remains a great challenge. Here, a novel multifunctional hydrogel with high tensile properties, self-adhesion, strain sensitivity and conductivity is prepared by introducing tannic acid (TA) coated graphitized carbon nanotubes (CNTs) into the network structure composed of polyacrylic acid (PAA) and carboxymethyl cellulose (CMC). The chemical cross-linking constructed the framework for the network of the hydrogel. The dynamic physical cross-linking of the multiple hydrogen bonding among TA, CMC, and PAA together with the π–π stacking between CNTs could dissipate energy effectively. The hybrid of chemical and physical cross-linking endowed the hydrogel with excellent toughness, high stretchability, and self-adhesion. The strain reached 1385% of its original length and self-adhesion force on the wood can reach 16.65 kPa. When the carbon nanotube content was 0.6 wt%, the conductivity of the hydrogel reached 5.13 S m−1. Furthermore, the resultant hydrogel as a strain sensor to detect various physiological human movements was investigated in detail. The results indicated that the multifunctional hydrogel has high strain sensitivity and fast response ability. Therefore, the resultant hydrogel has potential application as a strain sensor for human movement monitoring.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
可穿戴电子
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Penggang Wang,Danfeng Pei,Zengbin Wang,Mingjie Li,Xiaomei Ma,Jun You,Chaoxu Li
Artificial electric skin, which is capable of strongly adhering to different parts of human bodies and precisely detect different types of human motions, shows great promise for biomedical prosthetics, human/machine interfaces, wearable devices and soft robotics. In this study, biocompatible ionic gels with shape-adaptability and skin-adhering are produced through in situ polymerizing (3-acrylamidophenyl) boronic acid and acrylamide in the presence of chitosan containing catechol groups. The chemical cross-linkers are capable of modulating their elasticity, toughness and stretching tolerance. The reversible cross-linkers of H-bonding and dynamic covalent bonds endow the gels not only with strong adhering strength on different surfaces (including skin) and rapid self-healing in minutes, but also with large stretchability (e.g., 12–200 times of tensile length) and plasticity for shape-adaptability on irregular surfaces. Thus, by introducing mussel-inspired catechol groups into biomass-based macromolecules, a novel type of artificial ionic skin is designed with high sensitivity in combination with mechanical stretchability and bio-compatibility. They will promise great potential as (but not limited to) the skin-friendly sensor to detect various human motions with high accuracy and repeatability.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
可穿戴技术
·
软体机器人
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）