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High thermoelectric performance of flexible Ag/Ag_(2)Se composite film on nylon for low-grade energy harvesting

Journal of Materials Science & technology 2024年第12期179卷 79-85页

作者： Ying Liu Jiajia Li Zixing Wang Ping Wei Wenyu Zhao Lidong Chen Kefeng Cai Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Shanghai Key Laboratory of Development and Application for Metal-Functional MaterialsSchool of Materials Science&EngineeringTongji UniversityShanghai 201804China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In this work,Ag/Ag_(2)Se composite films with excellent thermoelectric(TE)properties and flexibility are prepared based on a simple one-pot *** adjusting the nominal ratios of Ag/Se,an optimal Ag/Ag_(2)Se composite film shows a large power factor of~2275 μW m^(-1) K^(-2) at 300 *** an outstand-ing TE performance of the composite film is due to the unique microstructure and the synergistic effect between the Ag and Ag_(2)***,the composite film also shows outstanding flexibility(~91.8%of the initial electrical conductivity is maintained,and the S is unchanged after 1500 bending cycles with a bending radius of 4 mm).Furthermore,a 4-leg flexible TE generator assembled with the optimal film produces a voltage of 14.06 mV and 4.96 μW at a temperature difference of 30.4 *** work provides a new inspiration for the preparation of flexible Ag_(2)Se-based films with excellent TE performance near room temperature.

关键词： Thermoelectric Ag/Ag_(2)Se Flexible Film Power generator

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Enhanced breakdown strength of BaTiO_(3)-based multilayer ceramic capacitor by structural optimization

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Rare Metals 2023年第8期42卷 2552-2561页

作者： Qian Liu Hua Hao Qing-Hu Guo Zhong-Hui Shen Jian Wang Ming-He Cao Zhong-Hua Yao Han-Xing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528220China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000China International School of Material Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China

0.5 wt%Nb_(2)O_(5)doped 0.12BiAlO_(3)-0.88BaTiO_(3)(12BA5N)multilayer ceramic capacitor(MLCC-1)was prepared,which satisfied EIA X7R specification(where X is the minimum temperature,R is the percentage of capacitance variation limit)at 1 *** distribution of internal electric field under breakdown voltage was simulated by finite element method(FEM),indicating that the electric field strength increased significantly at the terminal of internal *** areas may become the headstream of breakdown for MLCC-1 due to the shape *** order to improve the breakdown performance of MLCC-1,it was optimized by 12BA5N+2G green sheets(prepared by 12BA5N ceramic powder with 2 wt%B-Al-Si glass additive),then MLCC-2 was obtained which satisfied EIA X8R *** BDS rose from 20 to29.4 kV·mm^(-1),and the electric field distribution of dielectric layer was also analyzed by ***,it was also found that the grain size and the dielectric constants of"core"and"shell"parts for the 12BA5N+2G dielectric layer both contributed to the enhanced BDS of MLCC-2according to the simulation results from FEM.

关键词： Multilayer ceramic capacitor(MLCC) Breakdown strength(BDS) Simulation Grain size Dielectric constant

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Sp/sp^(2)carbon ratio-driven high-throughput screening of electrocatalytic nitrogen reduction performance on transition metal single-atom catalysts

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Rare Metals 2024年第11期43卷 5781-5791页

作者： Ze-Xiang Yin Yu-Dan Li Yu-Huan Ye Yuan Liu Mian-Feng Li Zi-Jun Yang Xue-Rong Zheng Hao-Zhi Wang Yang Wang Yi-Da Deng State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570100China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsKey Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)Tianjin UniversityTianjin 300072China

Single-atom catalysts(SACs)have been widely utilized in electrochemical nitrogen reduction reactions(NRR)due to their high atomic utilization and *** to the unique sp/sp^(2)co-hybridization,graphyne materials can offer stable adsorption sites for single metal *** investigate the influence of the sp/sp^(2)hybrid carbon ratio on the electrocatalytic NRR performance of graphyne,a high-throughput screening of 81 catalysts,with27 transition metals loaded on graphyne(GY1),graphdiyne(GY2),and graphtriyne(GY3),was conducted using firstprinciples *** results of the screening revealed that Ti@GY3 exhibits the lowest energy barrier for the rate-determining step(0.32 eV)in ***,to explore the impact of different sp/sp^(2)-hybridized carbon ratios on the catalytic activity of SACs,the mechanism of nitrogen(N_(2))adsorption,activation,and the comprehensive pathway of NRR on Ti@GY1,Ti@GY2,and Ti@GY3 was systematically *** was found that the ratio of sp/sp^(2)-hybridized carbon can significantly modulate the d-band center of the metal,thus affecting the energy barrier of the rate-determining step in NRR,decreasing from Ti@GY1(0.59 eV)to Ti@GY2(0.49 eV);and further to Ti@GY3(0.32 eV).Additionally,the Hall conductance was found to increase with the bias voltage in the range of 0.4-1 V,as calculated by Nanodcal software,demonstrating an improvement in the conductivity of the *** summary,this work provides theoretical guidance for modulating the electrocatalytic nitrogen reduction activity of SACs by varying the ratio of sp/sp^(2)hybrid carbon,with Ti@GY3 showing potential as an excellent NRR catalyst.

关键词： Nitrogen reduction reactions Single-atom catalysts Graphyne Ratio of sp/sp^(2)hybrid carbon High-throughput screening

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Swarming Magnetic Fe_(3)O_(4)@Polydopamine-Tannic Acid Nanorobots:Integrating Antibiotic-Free Superficial Photothermal and Deep Chemical Strategies for Targeted Bacterial Elimination

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Research 2025年第1期2024卷 840-853页

作者： Luying Si Shuming Zhang Huiru Guo Wei Luo Yuqin Feng Xinkang Du Fangzhi Mou Huiru Ma Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina Wuhan Institute of Photochemistry and Technology WuhanChina School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhanChina

Micro/nanorobots(MNRs)are envisioned to provide revolutionary changes to therapies for infectious diseases as they can deliver various antibacterial agents or energies to many hard-to-reach infection ***,existing MNRs face substantial challenges in addressing complex infections that progress from superficial to deep ***,we develop swarming magnetic Fe3O4@polydopamine-tannic acid nanorobots(Fe3O4@PDA-TA NRs)capable of performing targeted bacteria elimination in complicated bacterial infections by integrating superficial photothermal and deep chemical *** Fe3O4@PDA-TA nanoparticles(NPs),serving as building blocks of the nanorobots,are fabricated by in situ polymerization of dopamine followed by TA *** driven by alternating magnetic fields,Fe3O4@PDA-TA NPs can assemble into large energetic microswarms continuously flowing forward with tunable ***,the swarming Fe3O4@PDA-TA NRs can be navigated to achieve rapid broad coverage of a targeted superficial area from a distance and rapidly eradicate bacteria residing there upon exposure to near-infrared(NIR)light due to their efficient photothermal ***,they can concentrate at deep infection sites by traversing through confined,narrow,and tortuous passages,exerting sustained antibacterial action through their surface TA-induced easy cell adhesion and subsequent membrane ***,the swarming Fe3O4@PDA-TA NRs show great potential for addressing complex superficial-to-deep *** study may inspire the development of future therapeutic microsystems for various diseases with multifunction synergies,task flexibility,and high efficiency.

关键词： therapies infectious diseases complex infections chemical therapy magnetic nanoparticles polydopamine photothermal therapy targeted bacteria elimination tannic acid

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High-strength,electrically insulated industrial meta-aramid paper reinforced with polyethylene terephthalate microfibre pulp in a sandwich structure

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High Voltage 2024年第6期9卷 1402-1413页

作者： Meijun Chen Songjun Yao Guobin Zhu Mengyun Wu Zhiying Li Siwei Xiong Shiwen Yang Hua Wang Liangbo Zhu Luoxin Wang State Key Laboratory of New Textile Materials&Advanced Processing Technology College of Materials Science and EngineeringWuhan Textile UniversityWuhanChina High-Tech Organic Fibers Key Laboratory of Sichuan Province ChengduSichuanChina

The weak interfacial strength and porous structure of the meso-aramid paper cause mechanical and insulating *** density,regulating pore structure,and improving interfacial interactions of meso-aramid are crucial for promoting the perfor-mance of meso-aramid papers.A PMIA/polyethylene terephthalate(PET)composite paper was prepared using the wet method with meso-aramid short cut fibres(PMIA)and PET pulp as raw *** sandwich-structured PMIA/PET paper was achieved by covering PET microfiber non-wovens served as the surface layer while the PMIA/PET composite paper acted as the core *** the high-temperature hot pressing process,the PET pulp transformed into a viscous melt that coated on aramid fibres in between layers,forming a typical‘reinforced concrete’interface structure within the core layer of the PMIA/PET composite *** PET non-wovens on top and bottom surfaces were converted into a dense PET film that filled and covered the holes and defects in the PMIA/PET composite *** unique structure enabled the sandwich-structured PMIA/PET composite paper to exhibit excellent tensile strength(80.41 N/cm)and breakdown strength(56.35 kV/mm),surpassing most reported performances of meso-aramid papers in *** work not only provides novel insights for pre-paring high-performance meso-aramid papers,but also shows potential applications for other materials and structures.

关键词： strength structure sandwich

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Progress on mechanical and tribological characterization of 2D materials by AFM force spectroscopy

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Friction 2024年第12期12卷 2627-2656页

作者： Shuai WU Jie GU Ruiteng LI Yuening TANG Lingxiao GAO Cuihua AN Qibo DENG Libin ZHAO Ning HU Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China Advanced Equipment Research Institute Co. Ltd.of Hebei University of TechnologyTianjin 300401China Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of EducationTianjin 300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin 300130China

Two-dimensional(2D)materials are potential candidates for electronic devices due to their unique structures and exceptional physical properties,making them a focal point in nanotechnology *** assessment of the mechanical and tribological properties of 2D materials is imperative to fully exploit their potential across diverse ***,their nanoscale thickness and planar nature pose significant challenges in testing and characterizing their mechanical *** the in situ characterization techniques,atomic force microscopy(AFM)has gained widespread applications in exploring the mechanical behaviour of nanomaterials,because of the easy measurement capability of nano force and displacement from the AFM ***,AFM-based force spectroscopy is a common approach for studying the mechanical and tribological properties of 2D *** review comprehensively details the methods based on normal force spectroscopy,which are utilized to test and characterize the elastic and fracture properties,adhesion,and fatigue of 2D ***,the methods using lateral force spectroscopy can characterize the interfacial properties of 2D materials,including surface friction of 2D materials,shear behaviour of interlayers as well as nanoflake-substrate *** influence of various factors,such as testing methods,external environments,and the properties of test samples,on the measured mechanical properties is also *** the end,the current challenges and issues in AFM-based measurements of mechanical and tribological properties of 2D materials are discussed,which identifies the trend in the combination of multiple methods concerning the future development of the in situ testing techniques.

关键词： two-dimensional(2D)materials atomic force microscopy(AFM) mechanical properties nanomechanical testing nanotribology

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Highly reliable joints between dissimilar materials

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Journal of Iron and Steel Research International 2024年第10期31卷 2327-2328页

作者： Wei-min Long State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou 450001HenanChina

As high-end core equipment evolves toward intelligence,lightweight,and integration,the service environment of key components has become increasingly *** single-material structures can hardly,if not all,meet the requirement of comprehensive performance for high-end equipment manufacturing,reflecting the increas-ing importance of highly reliable joints between dissimilar materials.

关键词： service Highly evolve

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Atomistic study of inverse size effect induced by interfacial plasticity in pearlitic multi-principal element alloy

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Rare Metals 2024年第7期43卷 3341-3355页

作者： Chen Yang Qiao-Sheng Xia Cun-Hong Yin Dong-Peng Hua College of Mechanical Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Advanced Manufacturing Technology Ministry of EducationGuizhou UniversityGuiyang 550025China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072China

Owing to the fine nano-laminated structure,the pearlitic multi-principal element alloy(PMPEA) exhibits excellent mechanical and tribological ***,the incomplete understanding of the size effect of its lamella thickness and the unclear understanding of the plasticity-interface interaction mechanism limit further optimization of *** this study,the FeCoNi/Ni_3Ti interface-mediated plastic deformation behavior in PMPEA and the variation of mechanical and tribological properties with lamella thickness within the nanoscale range using molecular dynamics(MD) simulation were *** results indicate that the mechanical and tribological properties of the PMPEA with lamella thicknesses below 10 nm have a significant inverse size effect,i.e.,the smaller the lamella thickness,the weaker the *** is because the plastic carrier-interface interaction mechanism changes from a strengthening mechanism that hinders dislocations to a weakening mechanism that promotes dislocations with the decreases in the lamella thickness,and the weakening effect becomes more pronounced as the lamella thickness decreases and the number of interfaces *** particular,the deformation behavior of Ni_3Ti lamellae changes from crystal-like to amorphous-like with decreasing ***,in the sample with larger lamella thickness,the occurrence of hierarchical slips in the body-centered cubic(BCC) phase due to the multiprincipal elements effect can better alleviate the stress concentration caused by the dislocation accumulation at the interface,so that the phase interface exhibits outstanding load-bearing *** the dislocation pattern in BCC phase shows a firm high-density cell,which makes the substrate exhibit a stable tribological response.

关键词： Multi-principal element alloy Nano-laminated structure Molecular dynamics simulation Nanoindentation and nanoscratch

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Review of spatial scale dispersion models (ATDMs) to simulate environmental dispersion and deposition of radionuclides and the overview of GIS coupling with dispersion models

International Journal of Advanced Nuclear Reactor Design and...

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International Journal of advanced Nuclear Reactor Design and technology 2024年第4期6卷 256-280页

作者： Muhammad, Hussaini Xuan, Wang Wang, Mingjun Su, Guanghui School of Nuclear Science and Technology Shanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Abuja Nigeria

Estimation of the radiological consequences including the calculation of radiation doses to the exposed population requires numerical evaluation of atmospheric radioactive releases from nuclear facilities under accidental scenarios for implementation of adequate protective and other response actions to prevent or minimize severe deterministic effects and reduce the probability of occurrence of stochastic effects. This paper reviews various state-of-the-art spatial scale atmospheric dispersion models, known as the ATDMs, designed to evaluate atmospheric transport, dispersion, and depositions of radionuclide emissions from release sources. The ATDMs (atmospheric transport, dispersion, and deposition models) reviewed in this paper are FLEXPART, CALPUFF, LADAS, RASCAL, RIMPUFF, and HotSpot. These ATDMs are increasingly applied to perform probabilistic radiological risk assessment, which is one of the IAEA safety requirements for site evaluation of new NPP, and the calculated doses can be used to establish EPZs, an underlying basis of emergency preparedness. The numerical approaches, modeling methodology, advantages, limitations, scope of applications, and research investigations performed using these models in radiological and other environmental impact assessments within their scope of applications are presented. GIS has been widely recognized as a technique applied to aid the modeling of pollutant dispersion and visualization of model outputs in a spatial context, among other benefits. In nuclear accident consequence evaluation, spatial data provides key information such as accident location, range of radiological contamination, population density, etc, which are very important. This demonstrates the high significance of GIS-ATDMs coupling. Therefore, an overview of the coupling of dispersion models with GIS is also highlighted. © 2025 Xi'an Jiaotong University

关键词： Risk assessment

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Conversion-type cathode materials for high energy density solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期100卷 409-425页

作者： Yuhao Ma Shihong Qing Hongyu Liu Chuntao Ma Yuan Yu Chuang Yu Liping Wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Solid-state lithium batteries(SSLBs)are regarded as an essential growth path in energy storage systems due to their excellent safety and high energy *** particular,SSLBs using conversion-type cathode materials have received widespread attention because of their high theoretical energy densities,low cost,and *** the great progress in research and development of SSLBs based on conversiontype cathodes,their practical applications still face challenges such as blocked ionic-electronic migration pathways,huge volume change,interfacial incompatibility,and expensive processing *** review focuses on the advantages and critical issues of coupling conversion-type cathodes with solid-state electrolytes(SSEs),as well as state-of-the-art progress in various promising cathodes(e.g.,FeS_(2),CuS,FeF_(3),FeF_(2),and S)in ***,representative research on conversion-type solid-state full cells is discussed to offer enlightenment for their practical ***,the energy density exhibited by the S cathode stands out impressively,while sulfide SSEs and halide SSEs have demonstrated immense potential for coupling with conversion-type ***,perspectives on conversion-type cathodes are provided at the material,interface,composite electrode,and battery levels,with a view to accelerating the development of conversion-type cathodes for high-energy–density SSLBs.

关键词： Conversion-type cathode Lithium-free cathode Solid-state electrolyte Solid-state lithium battery High energy density

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