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Intedrcalation in Two-Dimensional Transition Metal Carbides and Nitrides(MXenes) toward Electrochemical Capacitor and Beyond

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Energy & Environmental Materials 2020年第3期3卷 306-322页

作者： jianmin li Hao Wang Xu Xiao Department of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu Sichuan 610054China School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingapore 637459Singapore

Since its discovery in 2011,the emerging family of two-dimensional(2D)transition metal carbides,nitrides,and carbonitrides(denoted as MXenes)has shown tremendous promise in the field of energy storages,especially electrochemical capacitors(ECs).The intercalation of foreign species,including but not limited to proton,cations,organic ions,and solvents,is demonstrated as one of the dominant facts during the energy storage process of MXenes,through which interlayer spacing of MXenes can be reversibly tuned,followed with reversible redox reactions on the surface of *** a mechanism provides MXenes extremely high capacitance up to 1500 F cm-3,in aqueous acidic *** addition,because of the versatile terminations on their surface,the intercalation of ions into MXenes can simultaneously induce the reversible transformation of their electronic structure to trigger some other phenomenon,for example,electrochromic effect,which has great potential on electrochromic smart window—an extended application of ***,regulating and facilitating the intercalation in MXenes is of great significance for MXene-based *** this review,we summarize the recent progress on the intercalation in MXenes towards ECs,discussing on the intercalated species,working mechanisms,and methods to promote the ***,we prospect the future research directions of intercalation of MXenes in ECs,such as the combination of simulation and experiment on finding the best intercalation species,precisely controlling the interlayer spacing and beyond,to boost the electrochemical performance of MXene toward practical applications and multi-functional devices.

关键词： electrochemical capacitors intercalation ions MXenes solvents

Comparing EMG Pattern Recognition with and Without Hand and Wrist Movements

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Journal of Bionic Engineering 2022年第3期19卷 700-708页

作者： lizhi Pan Kai liu Kun Zhu jianmin li Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education School of Mechanical EngineeringTianjin UniversityTianjin300072China

Electromyography(EMG)pattern recognition has been widely employed for prosthesis *** studies demonstrated that amputees had poorer performances of EMG pattern recognition when compared to able-bodied *** factors,such as the muscle weakness and atrophy of residual limbs,the length of residual limbs,and the decrease of the affected side's motor cortex,had been studied to improve the performance of ***,there was no study on the factor that the absence of joint movements for *** study aimed to investigate whether the hand and wrist joint movements had effects on the EMG pattern *** able-bodied subjects were tested for 11 hand and wrist gestures with two different gesture modalities:hand and wrist joints unconstrained(HAWJU)and constrained(HAWJC).Time-domain(TD)features and linear Discriminant Analysis(LDA)were employed to compare the classification performance of the two *** to HAWJU,HAWJC significantly reduced the average Classification Accuracy(CA)across all subjects from 95.53 to 85.52%.The experimental results demonstrated that the hand and wrist joint movements had significant effects on EMG pattern *** outcomes provided a new perspective to study the factors affecting EMG pattern recognition.

关键词： Electromyography(EMG) Pattern recognition Classification accuracy(CA) Joint movements

Improved Fatigue and Damage Tolerant Material Design for Aerospace Industry

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Journal of Materials Science & Technology 2005年第6期21卷 856-862页

作者： Yigeng XU Jiang CHEN jianmin li Zefei ZHU School of Aerospace Automotive and Design Engineering University of Hertfordshire Hatfield Herts AL109AB UK Zhejiang University of Technology Hangzhou 310014 China Zhejiang Institute of Science and Technology Hangzhou 310033 China

Various micro-mechanical and micro-structural influences on fatigue crack growth resistance of the material have been investigated over the years. It is widely recognized that resistance to fatigue crack growth can be differentiated into ‘intrinsic＇ and ‘extrinsic＇. The separation of intrinsic and extrinsic crack growth resistance has constituted a major theme of fatigue research in the last 30 years, with the concept of crack closure or crack tip shielding being used to rationalize a wide range of micro-structural and mechanical influences on fatigue crack growth behavior. An accurately quantitative understanding of intrinsic and extrinsic effects on crack growth is essential to directed alloy design for improved fatigue resistance, and/or improved structural service life. This paper presents a compliance-based crack closure measurement method and a multi-mechanism based analytical model for the separation of intrinsic and extrinsic material fatigue resistance, with application in characterizing the fatigue performance of two high strength damage tolerant airframe AI alloys.

关键词： Fatigue Crack closure Alloy design

Variations in the Microstructure and Properties of Mn-Ti Multiple-phase Steel with High Strength under Different Tempering Temperatures

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 430-436页

作者： li Dazhao li Xiaonan CUI Tianxie li jianmin WANG Yutian FU Peimao School of Materials Scinece and Engineering North University of China Technology Center Taiyuan Iron & Steel (Group) Co. School of Materials Scinece and Engineering Tianjin University

There are few relevant researches on coils by tempering,and the variations of microstructure and properties of steel coil during the tempering process also remain *** using thermo-mechanical control process（TMCP）technology,Mn-Ti typical HSLA steel coils with yield strength of 920 MPa are produced on the 2250 hot rolling production ***,the samples are taken from the coils and tempered at the temperatures of 220℃,350℃,and 620℃*** tempering the strength,ductility and toughness of samples are tested,and meanwhile microstructures are *** initially emerge inside the ferrite laths and the density of the dislocation ***,the lath-shaped ferrites begin to gather,and the retained austenite films start to ***,the retained austenite films are completely decomposed into coarse and short rod-shape precipitates composed of C and Ti *** yield strength increases with increasing tempering temperature due to the pinning effect of the precipitates,and the dislocation density *** yield strength is highest when the steel is tempered at 220℃because of pinning of the precipitates to *** total elongation increases in all samples because of the development of ferrites during *** tensile strength and impact absorbed energy decline because the effect of impeding crack propagation weakens as the retained austenite films completely decompose and the precipitates *** paper clarifies the influence of different tempering temperatures on phase transformation characteristics and process of Mn-Ti typical multiphase steels,as well as its resulting performance variation rules.

关键词： multiple-phase microstructure lath-shaped ferrite polygonal ferrite precipitate retained austenite film

Mechanical Properties and Microstructure of Sulfur Aluminate Cement Composites Reinforced by Multi-walled Carbon Nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2018年第1期33卷 102-107页

作者：王宝民 XING Yunqing li jianmin School of Civil Engineering Dalian University of Technology

The effect of multi-walled carbon nanotubes（MWCNTs） on the mechanical properties and microstructure of sulfur aluminate cement（SAC） composites was investigated. The dispersed MWCNTs were added into SAC in various weight *** results of mechanical properties of the MWCNTs/SAC composites indicated that the addition of 0.08 wt% MWCNTs can improve the SAC compressive strength, flexural strength, and bend-press ratio by 15.54%, 52.38%, and 31.30% at maximum, respectively. The degree of SAC hydration and porosity and pore size distribution of the matrix were measured by X-ray diffraction（XRD）, thermal analysis（TG/DTG）, and mercury intrusion porosimetry（MIP）. Results show that the addition of MWCNTs in SAC composites can promote the hydration of SAC and the formation of C-S-H gel, reduce the porosity and refine the pore size distribution of the matrix. The microstructure was characterized by scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）. It is found that the MWCNTs have been dispersed homogeneously between the hydration products of SAC paste and act as bridges and networks between cracks and voids, which prevents the development of the cracks and transfers the load.

关键词： multi-wall carbon nanotubes(MWCNTs) sulfur aluminate cement (SAC) mechanical properties microstructure

Viologen-based flexible electrochromic devices

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Journal of Energy Chemistry 2024年第6期93卷 453-470,I0012页

作者： Wenwen Wu Shanlu Guo Jing Bian Xingyu He Haizeng li jianmin li College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina Department of Pathology College of MedicineUniversity of CincinnatiCincinnati 45221OhioUSA Optics and Thermal Radiation Research Center Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237ShandongChina

Electrochromic technology has gained significant attention in various fields such as displays,smart windows,biomedical monitoring,military camouflage,human-machine interaction,and electronic skin due to its ability to provide reversible and fast color changes under applied *** the rapid development and increasing demand for flexible electronics,flexible electrochromic devices(FECDs)that offer smarter and more controllable light modulation hold great promise for practical *** electrochromic material(ECM)undergoing color changes during the electrochemical reactions is one of the key components in electrochromic *** the ECMs,viologens,a family of organic small molecules with 1,1'-disubstituted-4,4'-dipyridinium salts,have garnered extensive research interest,due to their well-reversible redox reactions,excellent electron acceptance ability,and the ability to produce multiple ***,viologen-based FECDs demonstrate color changes in the liquid or semisolid electrolyte layer,eliminating the need for two solid electrodes and thus simplifying the device ***,viologens offer significant potential for the development of FECDs with high optical contrast,fast response speed,and excellent *** review aims to provide a comprehensive overview of the progress and perspectives of viologen-based *** begins by summarizing the typical structure and recent exciting developments in viologen-based FECDs,along with their advantages and ***,the review discusses recent advancements in FECDs with additional functionalities such as sensing,photochromism,and energy ***,the remaining challenges and potential research directions for the future of viologen-based FECDs are addressed.

关键词： Flexible electrochromic devices Optical modulation Viologens Flexible electronics Multifunctional devices Electrochromism

Structural transformation of FePt nanocomposite films during annealing and its effects on magnetic properties

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Rare Metals 2006年第Z1期25卷 588-591页

作者： ZHAN Xiaoyuan ZHANG Yue GU Yousong li jianmin Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

Fe100-xPtx(x=30at.%-60at.%) nanocomposite films were deposited on natural-oxidized Si(100) substrates by magnetron sputtering. The as-deposited films were annealed between 373 and 1073 K. In situ X-ray diffraction shows that the FePt nanocomposite films undergo a phase transformation from a disordered FCC phase to an ordered L10 phase between 673 and 773 K. The coercivity is 306 kA·m-1 whiles the average grain sizes is about 10 nm in the optimized FePt alloy film sample annealed at 673 K. The adjustable coercivity and fine grain size suggest that this FePt nanocomposites system is suitable as recording media at extremely high areal density.

关键词： structural transformation annealing process magnetic properties recording media

MXene fibers for electronic textiles:Progress and perspectives

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Chinese Chemical Letters 2023年第8期34卷 82-89页

作者： jianmin li Chaoyang Miao Jing Bian Shayan Seyedin Ke li College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Engineering Newcastle UniversityNewcastle upon Tyne NE17RUUnited Kingdom Centre for Research on Adaptive Nanostructures and Nanodevices(CRANN)&Advanced Materials and BioEngineering Research(AMBER)Centre School of ChemistryTrinity College DublinDublinDublin 2Ireland

The rapid evolution of portable and wearable electronic devices has fueled the development of smart functional textiles that are able to conduct electricity,sense body movements,or store *** main challenge inhibiting the further development of functional textile-based electronics is the lack of robust functional fibers with suitable electrical,electrochemical and sensing ***,an emerging family of two-dimensional(2D)materials,have shown to be promising candidates for producing functional fibers due to their exceptional electrical and electrochemical properties combined with solution *** unique ability of MXenes to readily form liquid crystal phases in various solvents has allowed them to generate additive-free fibers using a wet spinning *** this work,we review the recent exciting developments in the fabrication of neat MXenes fibers and present a critical evaluation of practical challenges in MXenes processing that influence the macroscale material properties and the performance of the subsequent *** also provide our assessment for the future opportunities and challenges in producing MXene fibers to help pave the way for their widespread use in advanced wearable applications.

关键词： MXene liquid crystal Wet spinning Conductive fiber Functional textile Flexible electronics

Contemporary Russia's Economic Transition and Development and China-Russia Economic and Trade Cooperation

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Social Sciences in China 2021年第4期42卷 158-178页

作者： li jianmin li Changjiang Institute of Russian Eastern European and Central Asian StudiesChinese Academy of Social Sciences the School of International Police Studies at People’s Public Security University of China

The year 2021 marks the 30th anniversary of the dissolution of the Soviet Union and Russia’s transition from a planned to a market *** is also the 25th anniversary of the announcement of a strategic partnership of cooperation between China and Russia and the 20th anniversary of the signing of the China-Russia Treaty of Good Neighborliness and Friendly ***,2021 is especially important both in terms of the development of contemporary Russia and the evolution of China-Russia *** the transitional economy of a great power,the Russian economy has distinctive characteristics;analysis of its economic transition and development over the past thirty years since the collapse of the Soviet Union,and especially in the period since Putin took office,is of immediate significance for observing the development of the Russian *** present,the profound changes the world is undergoing and alterations in the external environment present increasing uncertainties and obstacles to China-Russia economic and trade *** paper introduces the present state of China-Russia economic and trade cooperation and analyzes the new challenges and opportunities for future bilateral cooperation.

关键词： Russia's economic transition Putin's economic and institutional framework China-Russia economic and trade cooperation