CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yuye Zhu,Min Chen,Limin Wu
Polymeric coatings are usually threatened by some harsh environment factors, which induce the formation of cracks or loss of functional components. Traditional extrinsic self-healing coatings usually have only one single repair mode (crack-repairing or function-restoring mode) that may not be powerful enough to meet the complex repair needs in practical applications. Herein, we first report a UV-responsive, dual-functional, fully-utilized microsphere-based system for highly efficient self-healing coatings, in which the UV-reversible coumarin crosslinking shells can not only encapsulate and release functional compounds as the function-repairing agents, but also participate in self-healing process as the crack-repairing agents, thus realizing two modes of repair with 100% of utilization efficiency of microspheres.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2023
·Vol. 20
·期 6
·3635-3646
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IF 2.1
Haopeng Cai,Yinglong Wei,Baoguo Wang,Kun Jiang
It is necessary to give self-healing function to ceramic materials because of their notch sensitivity. In the past, studies on self-healing ceramics have mainly focused on the high-temperature stage, and less research has been done below 1000°C. In this study, SiC/Al 2 O 3 /TiB 2 ceramic composites were prepared by spark plasma discharge sintering, and cracks were introduced on the surface of the polished specimens. Crack healing at 600°C–800°C was investigated, and the recovery of macroscopic bending strength and the change of microscopic crack morphology after heat treatment were used to evaluate the crack-healing effect. It was found that the surface cracks of the material were completely filled and healed by oxidation products after heat treatment at 700°C for 60 min, and the highest healing efficiency exceeded 95% for both specimens with different crack lengths, and the main mechanism of crack by Si-Al-B-Na-Ca-O type glass produced by the reaction of TiB2 and a small amount of SiC with oxygen to produce oxides and glass powder. Good healing effect and fast healing speed effectively improve the service life and reliability of ceramic materials, which has very far-reaching significance for the practical application with ceramic materials.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
POLYMER COMPOSITES
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2024
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IF 4.8
Fenglei Zhang,Dongdong Han,Ning Xu,Xing Cui,Lei Zhang
Epoxy asphalt, a thermosetting polymer, is characterized by stable, irreversible internal chemical bonds that prevent recovery and spontaneous micro-crack healing, unlike conventional asphalt. This study introduces a renewable nano-modifier synthesized via esterification of carboxyl-functionalized carbon nanotubes (CNTs-COOH) and furfuryl alcohol (FA), termed CNTs-FA. The successful synthesis of CNTs-FA was confirmed through various microscopic techniques. Integrating CNTs-FA into epoxy asphalt materials, the optimal dosage was identified as 0.05% of the total epoxy asphalt mass using tensile tests and fluorescence microscopy. Thermal reversible effects and mechanisms were further analyzed through multiple regeneration cycles using tensile properties, fluorescence microscopy, and infrared spectroscopy. The study elucidates that the thermal reversibility in epoxy asphalt is facilitated by the Diels-Alder (DA) reaction between the conjugated diene structure in FA and the curing agent oleylamine. This research provides an effective solution to the non-recoverability and unrepairable micro-cracks of traditional epoxy asphalt mixtures. Highlights CNTs-FA was successfully prepared by esterification reaction. Using nano modification methods, introduce DA reaction into curing system. Renewable function of epoxy asphalt by DA reversible reaction.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Xiaoqing Zhang,Jianwei Xiong,Fengzhen Chang,Zhuijun Xu,Zheng Wang,Philip Hall,Ya-Jun Cheng,Yonggao Xia
The Ni-rich cathode holds great promise for high energy density lithium-ion batteries because of its high capacity and operating voltage. However, crucial problems such as cation disorder, structural degradation, side reactions, and microcracks become serious with increasing nickel content. Herein, a novel and facile sol/antisolvent coating modification of Ni-rich layered oxide LiNi0.85Co0.1Mn0.05O2 (NCM) is developed where we use ethanol to disperse the nanosized LiBO2 to form the sol and adopt tetrahydrofuran (THF) as antisolvent to prepare the cluster of nanoparticles to be coated on the surface of NCM. The coating thickness can be tuned through the THF addition amount. The LiBO2 nanorod deposition is formed as well over the crack of the NCM cathode, likely acting as a patch to repair the original defect of the intrinsic crack. The uniform LiBO2 nanospherical particle coating together with LiBO2 nanorod wrapping provides a double protection against electrolytes. Compared with the raw material, LiBO2-coated LiNi0.85Co0.1Mn0.05O2 (LiBO2-coated NCM) exhibits a high initial Coulombic efficiency of 90.3% at 0.2 C between 2.8 and 4.3 V vs Li+/Li, a superior rate capability, enhanced fast charge property at 3 C, and restricted microcrack formation. This simple in-site modification and repairing technology guarantees a good mechanical integrity of the polycrystalline Ni-rich cathode.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
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IF 15.7
Xie Xiaoming,Li Runhan,Qiao Yongsheng,Zhang Jiaqi,Zhang Zilin,Xu Xingyu,Yang Jie,Peng Yan-Yu,Chen Yifa,Li Shun-Li,Lan Ya-Qian
Low temperature tolerant adhesive with high flexibility and adhesion strength is highly desired yet challenging owing to the presence of obvious volume shrinkage, increased brittleness, and reduced transmission of mechanical stress at low temperature. Inspired by the cobweb, we hereby develop a kind of flexible adhesive that can be used at low temperature by in-situ polymerization of disulfide bond-based polymer with polyoxometalate. This low-temperature tolerant adhesive presents high flexibility and adhesion strength, good processability and reversible adhesion ability, a wide tolerable temperature range (i.e., −196 to 50 °C), and a long-lasting adhesion effect (>80 days, −196 °C) that is significantly better than commercial solvent-free adhesives. The adhesive can be processed into high-strength cobwebs, injected into tiny tube models, and adhered onto complicated interfaces. Notably, it enables to be kilogram-scale produced through a solvent-free method, holding promise for potential utilization in fields like repairing artifacts or precision instruments with micro-fractures at low temperature.
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
危险品化学品经营许可证（带存储）