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Corrosion Behavior of graphene nanosheets Reinforced Magnesium Matrix Composites in Simulated Body Fluids

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 525-536页

作者： Liwen Chen Jianhui Jing Lulu Zhang Jing Li Weipeng Chen Limin Li Yuan Zhao Hua Hou Yuhong Zhao School of Materials Science and Engineering Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-Performance Al/Mg Alloy MaterialsNorth University of ChinaTaiyuan 030051China Shanxi Key Laboratory of Advanced Manufacturing Technology School of Mechanical EngineeringNorth University of ChinaTaiyuan 030051China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Magnesium(Mg)alloy is considered as a promising biodegradable implant material but restricted to rapid ***,the new strategies based on thixomolding process had been explored to utilize the outstanding anti-permeability of graphene nanosheets(GNPs)while inhibit its galvanic corrosion with the matrix,so as to improve the corrosion resistance of *** agglomerate of GNPs with 0.9 wt%content is the main reason for the deterioration of corrosion performance due to the formation of micro-galvanic *** grain refinement of composites with 0.6 wt%content had positive effects on the better corrosion *** process adjusting,the unique distributions of GNPs along grain boundaries play a vital role in improving the corrosion *** can be ascribed to the following mechanisms:(I)The barriers can be established between the Mg matrix and corrosive medium,hence blocking the charge transfer at the interface;(II)The GNPs can effectively promote apatite deposition on the Mg matrix,leading to form dense apatite layers and prevent the further invasion of SBF;(III)The GNPs acting as reinforcements exists in the corrosion layer and apatite layer,impede the apatite layer falling off from the Mg *** findings broaden the horizon for biomedical applications in Mg matrix composites to realize desired performances.

关键词： Magnesium matrix composite graphene nanosheets Corrosion resistance

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Auxiliary ball milling to prepare WS_(2)/graphene nanosheets composite for lithium-ion battery anode materials

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Tungsten 2024年第1期6卷 124-133页

作者： Yong-Lin Wu Jia-Bin Hong Wei-Xu Zhong Chun-Xiang Wang Zhi-Feng Li Sydorov Dmytro Jiangxi Provincial Key Laboratory of Power Batteries and Materials Jiangxi University of Science and TechnologyGanzhou 341000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Institute of Bioorganic Chemistry and Petrochemistry National Academy of Sciences of UkraineKiev 02160Ukraine

A novel nano-WS_(2)/graphene nanosheets(GNSs)composite is obtained by ball milling with xylitol as auxiliary agent and hightemperature *** improves the shear force during ball milling and well overcomes the van der Waals interactions between the interlayer of graphite and WS_(2).Through high-temperature calcination,GNSs and WS_(2) nanosheets can form tight interface *** produced WS_(2)/GNSs composites can be used as anode materials for lithium-ion batteries,while maintaining a high reversible specific capacity of 705 mAh·g^(-1)with the capacity retention of 95%at a current density of 250 mA·g^(-1)after 200 cycles,mainly because WS_(2)/GNSs composites have a higher Li^(+)diffusion coefficient of 2.2×10^(-9)cm^(2)·s^(-1)and a higher specific surface area of 70.10 m^(2)·g^(-1).As a result,the xylitol-assisted ball milling method designed in this work is suitable for extended preparation of peeling of two-dimensional layer materials into nanosheets.

关键词： Lithium-ion battery Anode material WS_(2) graphene nanosheets Auxiliary ball milling

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Construction of SnS-Mo-graphene nanosheets composite for highly reversible and stable lithium/sodium storage

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Journal of Materials Science & Technology 2022年第26期121卷 190-198页

作者： Deliang Cheng Lichun Yang Renzong Hu Jie Cui Jiangwen Liu Min Zhu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Institute of Advanced Materials Jiangxi Normal UniversityNanchang 330022China Analytical and Testing Center South China University of TechnologyGuangzhou 510640China

Sn-based chalcogenides are considered as one of the most promising anode materials for lithium-ion batteries(LIBs)because of their high capacities through both conversion and alloying ***,the realization of full capacities of Sn-based chalcogenides is mainly hindered by the large volume variation and inferior reversibility of conversion reaction during *** present work,a new ternary Sn SMo-graphene nanosheets(Sn S-Mo-GNs)composite is fabricated by a simple and scalable plasma milling method,in which Sn S nanoparticles are tightly bonded with Mo and *** Mo and GNs additives can effectively alleviate the large volume change of Sn S upon cycling,which leads to a stable electrochemical ***,they can significantly suppress the Sn agglomeration in lithiated Sn S,which enables highly reversible conversion reaction during *** anode for LIBs,the Sn S-Mo-GNs composite exhibits a high initial coulombic efficiency of 86.9%(almost complete reversibility of Sn S,~97.3%),high cyclic coulombic efficiency after initial three cycles(>99.5%),and long lifespan(up to 600 cycles).Moreover,it also demonstrates superior electrochemical performance for sodium ***,this work demonstrates a potential anode for batteries application and provides a viable strategy to obtain highly reversible and stable anodes for lithium/sodium storage.

关键词： SnS nanoparticle Mo metal graphene nanosheets Reversibility Anode

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Tribological properties of copper matrix composites reinforced with homogeneously dispersed graphene nanosheets

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Journal of Materials Science & Technology 2018年第10期34卷 1925-1931页

作者： Xin Gao Hongyan Yue Erjun Guo Shaolin Zhang Longhui Yao Xuanyu Lin Bao Wang Enhao Guan School of Materials Science and Engineering Harbin University of Science and Technology Department of Physics Dongguk University

graphene reinforced copper matrix composites （Gr/Cu） were fabricated by electrostatic self-assembly and powder metallurgy. The morphology and structure of graphene oxide, graphene oxide-Cu powders and Gr/Cu composites were characterized by scanning electronic microscopy, transmission electronic microscopy, X-ray diffraction and Raman spectroscopy, respectively. The effects of graphene contents, applied loads and sliding speeds on the tribological behavior of the composites were investigated. The results indicate that the coefficient of friction of the composites decreases first and then increases with increasing the graphene content. The lowest friction coefficient is achieved in 0.3 wt~ Gr/Cu composite, which decreases by 65% compared to that of pure copper. The coefficient of friction of the composite does not have significant change with increasing the applied load, however, it increases with increasing the sliding speed. The tribological mechanisms of the composite under different conditions were also investigated.

关键词： graphene nanosheets Copper matrix composites Tribological properties Microstructure

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Sliding wear behavior of copper-based composites reinforced with graphene nanosheets and graphite

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Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3354-3362页

作者：李景夫张雷肖金坤周科朝中南大学粉末冶金国家重点实验室长沙410083

The mechanical and tribological properties of hot-pressed copper-based composites containing different amounts of graphene nanosheets（GNSs） are compared with those of copper-graphite（Gr） composites fabricated by the same *** results show that the Cu-GNSs composites exhibit higher relative density,microhardness and bending strength compared with Cu-Gr composites with the same volume fraction of GNSs and ***,the friction coefficients and wear rates reduce significantly by the addition of GNSs,whereas the limited impact on reducing friction and wear is found on *** abrasive and delamination wear are the dominant wear mechanisms of the *** is believed that the superior mechanical and tribological performances of Cu-GNSs composites are attributed to the unique strengthening effect as well as the higher lubricating efficiency of graphene nanosheets compared with those of graphite,which demonstrates that GNS is an ideal filler for copper matrix composites,acting as not only an impactful lubricant but also a favorable reinforcement.

关键词： graphene nanosheets graphite composite friction coefficient wear mechanism

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The Effect of Thermal Exfoliation Temperature on the Structure and Supercapacitive Performance of graphene nanosheets

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Nano-Micro Letters 2015年第1期7卷 17-26页

作者： Haiyang Xian Tongjiang Peng Hongjuan Sun Jiande Wang Institute of Mineral Materials & Application Southwest University of Science and Technology School of Material Science and Engineering Southwest University of Science and Technology

graphene nanosheets(GSs) were prepared from graphite oxide by thermal exfoliation method. The effect of thermal exfoliation temperature on the structure and supercapacitive performance of GSs has been investigated. The results show that the GSs with pore sizes center around 4.0 nm. With an increase of thermal reduction temperature, the number of stacking layers and the structure disorder degree increase, while the oxygen-containing groups content, BET surface area,and electrical resistivity of GSs decrease. The results indicate that 673 K is the preferable thermal exfoliation temperature to acquire good supercapacitive performance. In this case, the GSs have the best supercapacitive performance(233.1 F g-1) in a 6 mol L-1KOH electrolyte. The prepared GSs at the preferable thermal exfoliation temperature have good rate performance and cycle stability.

关键词： graphene nanosheets Thermal exfoliation temperature Supercapacitive performance

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Nano-mechanical and tribological properties of copper matrix composites reinforced by graphene nanosheets

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Progress in Natural Science:Materials International 2018年第4期28卷 416-421页

作者： Xiancong He Gaopeng Zou Yongxiang Xu Haochun Zhu Hao Jiang Xiaofan Jiang Wei Xia Jingtao Chen Jiawei Wu Shaofeng Yang Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology and School of Materials Science and Engineering Nanjing Institute of Technology

The impacts of graphene nanosheets content on microstructure, nano-mechanical and tribological properties of the copper matrix composites were investigated. The graphene nanosheets randomly distributed in copper matrix, which obviously hindered its grain growth. The elastic modulus and nano-hardness of the copper matrix composite with 0.2 wt% graphene nanosheets were enhanced 47.5% and 54.7% compared to these of pure copper, respectively. The average creep degree(5.1%) was lower than that(11.8%) of pure copper in holding stage. The creep rate(ca. 0.016 nm/s) decreased 10 times as that(ca. 0.16 nm/s) of pure copper in steady-state creep. The tribological performances were improved dramatically with increase of graphene nanosheets content.

关键词： Copper matrix composites graphene nanosheets Nano-mechanical properties

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Electrochemical performance of graphene nanosheets as electrode material for supercapacitors

Electrochemical performance of graphene nanosheets as electr...

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第八届中国功能材料及其应用学术会议

作者： LI Liang-yu ZHAO Dong-lin ZHANG Dong-dong State Key Laboratory of Chemical Resource Engineering Key Laboratory of Carbon Fiber and Functional PolymersMinistry of EducationBeijing University of Chemical Technology

ISBN: (纸本)9783037859698

graphene nanosheets(GNSs) were prepared from flake natural graphiteby oxidation,rapid expansion and ultrasonic *** morphology,structure and electrochemical performance of GNSs as electrode materials forsupercapacitors were systematically investigated via high-resolution transmission electron microscopy,X-ray diffraction,nitrogen adsorption and desorption isotherms and a variety of electrochemical testing *** electrodes with freestanding GNSs prepared by coating methodexhibited good rate capability and reversibility at high scan rates in electrochemical *** electrode with specific surface area of 243mg1maintained a stable specific capacitanceof 200 F g under specific current of 0.1 A gfor 500 cycles of charge/discharge.

关键词： graphene nanosheets Supercapacitors Electrochemical performance

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High dielectric permittivity and low dielectric loss nanocomposites based on poly(VDF-TrFE-CTFE)and graphene nanosheets

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Journal of Advanced Dielectrics 2013年第2期3卷 33-38页

作者： Fei Wen Zhuo Xu Weimin Xia Xiaoyong Wei Zhicheng Zhang Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchXi’an Jiaotong UniversityXi’an 710049P.R.China Department of Applied Chemistry MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterSchool of ScienceXi’an Jiaotong UniversityXi’an710049P.R.China

In this work,nanocomposites(poly(vinylidenefluoridetrifluoroethylenechlorotrifluoroethylene)/graphene nanosheets)(P(VDF-TrFE-CTFE)/GNS)were fabricated via solution cast *** were covalently functionalized with KH550 to improve their interfacial interactions with the terpolymer matrix P(VDF-TrFE-CTFE).Compared to neat terpolymer,significantly improved dielectric permittivity and low loss were observed for the *** instance,at 1 kHz the P(VDF-TrFE-CTFE)/GNS composites with 4%GNS possessed a dielectric permittivity of 144,over 14 times larger than that of neat terpolymer,while the loss was only *** findings represent an effective route to design potential dielectric polymer films for high-charge storage capacitors.

关键词： Dielectric graphene nanosheets nanocomposites ferroelectric elastomer

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Interface Design Strategy for GNS/AZ91 Composites with Semi-Coherent Structure

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 467-483页

作者： Jing-Peng Xiong Yi-Qi Zeng Jin-Long Liu Wei-Cheng Wang Lan Luo Yong Liu Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province School of Advanced ManufacturingNanchang UniversityNanchang 330031China School of Physics and Materials Science Nanchang UniversityNanchang 330031China

The interfacial structure plays an important role in the mechanical properties of magnesium matrix composite(MMCs)reinforced with graphene nanosheet(GNS)due to their poor wettability with the Mg *** interface design strategy was proposed to form the semi-coherent interfacial structure with superior bonding *** lattice mismatch and interfacial bonding strength between Mg/rare earth oxide/carbon were utilized as key characteristics to evaluate the interfacial *** oxide(La2O3)was selected as the intermediate candidate due to its low lattice mismatch and high interfacial bonding *** identify the interfacial structure of Mg/La2O3/graphene,first-principles calculations were conducted to calculate the ideal work of separation and electronic structure of the *** demonstrated the presence of strong ionic and covalent interactions at the interface,which theoretically verified the strong interfacial bonding strength among Mg/La2O3/graphene *** experimentally validate the interface strength,MMCs with the interface structure of Mg/La2O3/GNS were *** formation of in-situ La2O3 led to the successful attainment of semi-coherent structures between Mg/La2O3 and La2O3/GNS,resulting in high strength and good ductility of the ***,this work proposes a new approach to interface design in MMCs with an enhancement of mechanical properties.

关键词： Interface design strategy Magnesium matrix composite graphene nanosheets Semi-coherent interface Mechanical properties

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