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Intermittent oxidation kinetics and metal/oxide interfacial undulation

Physical Review B 2024年第8期110卷 085402-085402页

作者： Dongxiang Wu Xianhu Sun Judith C. Yang Guangwen Zhou Department of Mechanical Engineering & Materials Science and Engineering Program Department of Chemical and Petroleum Engineering

The phenomenon of oxygen adsorption induced surface restructuring is widespread across various metal-oxygen systems, yet its impact on initiating bulk oxide formation remains largely unexplored. Through in situ atomic-resolution electron microscopy observations of surface oxidation of Cu(110) and Cu85Au15(110), we unveil intermittent oxide-film growth modulated by oxygen-induced surface restructuring. This modulation is evidenced by repeated pinning of the Cu2O growth front at isolated Cu columns of the c(6×2)-O reconstruction, owing to required long-range diffusion of Cu and O atoms to the Cu2O growth front. We reveal that Cu vacancies, generated at the Cu2O growth front, are injected into the Cu2O/Cu interface, inducing hill and valley undulation of the Cu2O film. In contrast, atomic vacancies produced during the Cu85Au15(110) oxidation preferentially migrate into interfaces between Au-rich and Au-poor regions in the bulk, resulting in a flat and adherent Cu2O film. These findings demonstrate the critical role of oxygen-induced surface restructuring in modulating oxide film growth kinetics and the manipulability of the fate of injected vacancies by alloying, thereby offering insights applicable to a broader range of metal-oxygen systems for fine-tuning oxidation kinetics and enhancing oxide/metal interfacial adhesion.

关键词： Surface & interfacial phenomena Surface reconstruction Surface growth Density functional theory Transmission electron microscopy

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Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance

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Journal of materials science & Technology 2023年第17期148卷 250-259页

作者： Fushan Li Qiuyu Li Hideo Kimura Xiubo Xie Xiaoyu Zhang Nannan Wu Xueqin Sun Ben Bin Xu Hassan Algadi Rami Adel Pashameah Abdullah K.Alanazi Eman Alzahrani Handong Li Wei Du Zhanhu Guo Chuanxin Hou School of Environmental and Material Engineering Yantai UniversityYantai 264005China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264005China School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran 11001Saudi Arabia Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMakkah 24230Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Integrated Composites Laboratory(ICL) Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK Department of Chemical and Bimolecular Engineering University of TennesseeKnoxvilleTN 37996United States

The microscopic morphology of electromagnetic wave absorbers influences the multiple reflections of electromagnetic waves and impedance matching,determining the absorption ***,the urchin-shaped bimetallic nickel-cobalt oxide/carbon(NiCo_(2)O_(4)/C)composites are prepared via a hy-drothermal route,whose absorption properties are investigated by different morphologies regulated by changing calcination temperature.A minimum reflection loss(RL_(min))of-75.26 dB is achieved at a match-ing thickness of 1.5 mm,and the effective absorption bandwidth(EAB)of 8.96 GHz is achieved at 2 ***-advantages of the synthesized NiCo_(2)O_(4)/C composites contribute to satisfactory absorption ***,the interweaving of the needle-like structures increases the opportunities for scattering and multiple reflections of incident electromagnetic waves,and builds up a conductive network to facilitate the enhancement of conductive ***,the carbon component in the NiCo_(2)O_(4)/C composites en-hances the interfacial polarization and reduces the density of the ***,generous oxygen va-cancy defects are introduced into the NiCo_(2)O_(4)/C composites,which induces defect polarization and dipole *** summary,the ternary coordination of components,defects and morphology led to out-standing electromagnetic wave absorption,which lightened the path for improving the electromagnetic wave absorption property and enriching the family of NiCo_(2)O_(4) absorbers with excellent performance.

关键词： NiCo_(2)O_(4)/C Oxygen vacancies Interfacial polarization Electromagnetic wave absorber

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HIGH-PRECISION THERMAL CHARACTERIZATION OF ULTRA-LOW THERMAL RESISTANCE COPPER NANO-WIRE (CUNWS)POLYDIMETHYLSILOXANE (PDMS) COMPOSITE THERMAL INTERFACE materialS (TIMS) TAPE

HIGH-PRECISION THERMAL CHARACTERIZATION OF ULTRA-LOW THERMAL...

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ASME 2024 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, InterPACK 2024

作者： Jiang, Kaiying Kwon, Heungdong Qiao, Hansen He, Yini Asheghi, Mehdi Goodson, Kenneth E. Department of Mechanical Engineering Stanford University StanfordCA94305 United States Department of Material Science Engineering Stanford University StanfordCA94305 United States

ISBN: (纸本)9780791888469

This work details high-precision thermal characterization of CuNWs-PDMS composite TIMs using infrared (IR) cross-sectional microscopy. To enhance measurement sensitivity and to reduce the thermal resistances across TIM tester components and sample, we apply thin layers of high thermal conductivity gallium-based liquid metal (LM) to reduce the dry contact thermal interface resistances from ~10-4 to 1.4×10-6 m2KW-1. Application of the LM in combination with a 1 mm thick silicon wafer as the reference layer, yields thermal resistance of ~(3.23 ± 0.6)×10-6 m2KW-1 for the CuNWs/PDMS composite. Theoretical analyses suggest the potential for achieving even lower thermal resistance values with optimized LM wetting thickness while the accuracy of the measurements can be further improved by pattering a heater on the backside of the 1 mm thick silicon reference substrate. Copyright © 2024 by ASME.

关键词： Silicon wafers

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A soft magnetoelectric finger for robots’multidirectional tactile perception in non-visual recognition environments

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npj Flexible Electronics 2024年第1期8卷 938-948页

作者： Yizhuo Xu Shanfei Zhang Shuya Li Zhenhua Wu Yike Li Zhuofan Li Xiaojun Chen Congcan Shi Peng Chen Pengyu Zhang Michael D.Dickey Bin Su State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074 HubeiP.R.China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074 HubeiP.R.China Department of Chemical and Biomolecular Engineering North Carolina State UniversityRaleighNC 27695USA

Robotic fingers with multidirectional tactile perception are of great importance for the robotic exploration of complex unknown space,especially in environments in which visualization is not ***,most existing tactile sensors for robotic fingers cannot detect multidirectional forces,which greatly limits their potential for further development in navigating complex ***,we demonstrate a soft magnetoelectric finger(SMF)that can achieve self-generated-signal and multidirectional tactile *** SMF is composed of two parts:a‘finger’covered with a skin-like flexible sheath containing five liquid metal(LM)coils and a‘phalangeal bone’containing a *** to the changes in magnetic flux through the LM coils caused by external forces,diverse induced voltages are generated and collected in real-time,which can be explained by Maxwell’s numerical *** the analysis of the signals generated by the five LM coils,the SMF can detect forces in varied directions and distinguish 6 different common objects with varied Young’s moduli with an accuracy of 97.46%.These capabilities make the SMF suitable for complex unknown space exploration tasks,as proved by the black box *** SMF can enable the development of self-generated-signal and multidirectional tactile perception for future robots.

关键词： environments magneto perception

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Correction to: Mechanism and machinability in novel electroplastic-assisted grinding ductile iron (Advances in Manufacturing, (2025), 13, 1, (245-263), 10.1007/s40436-024-00533-w)

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Advances in Manufacturing 2025年 1-2页

作者： Liu, Jia‑Hao Jia, Dong‑Zhou Li, Chang‑He Zhang, Yan‑Bin Fu, Ying Lv, Zhen‑Lin Feng, Shuo College of Mechanical Engineering and Automation Liaoning University of Technology Liaoning Jinzhou121001 China School of Mechanical & Automotive Engineering Qingdao University of Technology Shandong Qingdao266520 China Songshan Lake Material Laboratory Guangdong Dongguan523808 China School of Materials Science and Engineering Xi’an University of Technology Xi’an710048 China

In this article, the biography details for authors Chang‑He Li, Yan‑Bin Zhang, Ying Fu, Zhen‑Lin Lv and Shuo Feng were incorrectly given as "is a lecturer at School of mechanical engineering and Automation, Liaoning University of Technology, Jinzhou, China. He received his Ph.D. degree from Qingdao University of Technology, Qingdao, China, in 2021. His current research interests focus on precision and special machining technology, multi-energy field composite machining technology." The correct biography details should read as below. Chang-He Li is a foreign academician of the Russian academy of engineering, professor, and doctoral supervisor at School of mechanical and Automotive engineering, Qingdao University of Technology, Qingdao, China. His research interests include grinding and precision machining, quasi-dry green manufacturing, intelligent manufacturing equipment and production lines, and intelligent agricultural machinery equipment. Yan-Bin Zhang is a professor of Qingdao University of Technology. He is a Xiangjiang Scholar from The Hong Kong Polytechnic University. He received his Ph.D. degree from Qingdao University of Technology, Qingdao, China in 2018. His current research interests focus on intelligent and clean precision manufacturing. Ying Fu is a senior researcher at Songshan Lake materials Laboratory, Dongguan, China. His current research interests focus on vacuum metallurgy technology and equipment development, metal matrix composite materials, metal purification technology. Zhen-Lin Lv is a professor at School of materials science and engineering, Xi’an University of Technology, Xi’an, China. His current research interests focus on tribology and performance optimization of materials, powder metallurgy and ceramic materials, high-temperature structural materials and molding technology. Shuo Feng is a master student at School of mechanical engineering and Automation, Liaoning University of Technology, Jinzhou, China. His current research interests

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NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

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Journal of materials science & Technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial Key Laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

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Direct Multi-group Cross-sections via NJOY+OJOYU for PWR and FLiBe-MSR Reactor Systems

Direct Multi-group Cross-sections via NJOY+OJOYU for PWR and...

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2023 Transactions of the American Nuclear Society Annual Meeting and Technology Expo, ANS 2023

作者： Wang, Meng-Jen Simpson, Michael Sjoden, Glenn E. Nuclear Engineering Program Department of Civil and Environmental Engineering University of Utah United States Department of Material Science and Engineering University of Utah United States

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Determination of interfacial heat transfer coefficient at the frozen sand mold casting process of ZL101 alloy

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Journal of materials science & Technology 2024年第27期194卷 28-42页

作者： Shijie Dong Zhongde Shan Feng Lin Haoqin Yang Xiao Liang Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and TechnologyBeijing 100037China Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaBeijing 100084China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Compared to the resin sand mold casting process, frozen casting is more environmentally friendly, providing a better working environment and enhanced supercooling degree. The interfacial heat transfer coefficient (IHTC) between frozen sand mold and metal is an important parameter that significantly influences the final mechanical properties and microstructure of the castings. This paper solved the inverse heat conduction problem using the finite difference method (FDM). In addition, the conjugate gradient method (CGM) was adopted to calculate the temperature distribution and heat flux in the molten metal. At the same time, the particle swarm optimization algorithm (PSO) was used in temperature distribution determination in frozen sand mold. The interfacial heat transfer coefficient (IHTC) was estimated during the solidification of ZL101. The results showed a good agreement between calculated and experimental data, obtaining accurate casting interface temperature Tm, frozen sand mold interface temperature Ts, heat flux q, and IHTC. The analysis of the IHTC variation revealed a water content value within the range of 4 wt.% to 5 wt.% resulted in IHTC in two types of interpretation, called ‘fluctuation type’ and ‘turning type’.

关键词： Frozen sand mold Interfacial heat transfer coefficient(IHTC) Finite difference method(FDM) Conjugate gradient method(CGM) Particle swarm optimization(PSO)

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Strengthening behavior of AlCoCrFeNi(TiN)_(x) high-entropy alloy coatings fabricated by plasma spraying and laser remelting

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Journal of materials science & Technology 2022年第26期121卷 163-173页

作者： Bingqian Jin Nannan Zhang Shuo Yin Department of Material Science and Engineering Shenyang University of TechnologyShenyang 110870China Department of Mechanical Manufacturing and Biomedical EngineeringTrinity College DublinThe University of DublinParsons BuildingDublin 2Ireland

High-entropy alloy(HEA)coatings are of great importance in the fabrication of wear resistance *** coatings containing ceramic particles as reinforcement phase usually have better wear *** this study,AlCoCrFe Ni(TiN)_(x)(x:molar ratio;x=0,0.2,0.4,0.6,0.8,1.0)HEA coatings were fabricated on Q235 steel by plasma spray first and then subjected to laser *** experimental results confirm that plasma spray together with post laser remelting could result in the in-situ formation of TiN-Al_(2)O_(3) ceramic particles and cuboidal B2 phase in the AlCoCrFeNi(TiN)_(x) HEA *** in-situ TiN-Al_(2)O_(3) and nano-cuboidal B2 precipitation phase strengthened the coatings and improved their wearresistance *** to the dispersion of hard phase and nano-particles resulting from second heating,the microhardness of the Al Co Cr Fe Ni(Ti N)coatings significantly increased from 493 to 851 HV after laser *** the same reasons,the wear-resistance performance was also significantly promoted after laser remelting.

关键词： High-entropy alloy Coatings Ceramics Laser remelting Microstructure Wear resistance

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High resolution and high sensitivity imaging magnetometer with magnetic nanoparticle and optical heterodyne detection

High resolution and high sensitivity imaging magnetometer wi...

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2024 Frontiers in Optics, FiO 2024

作者： Bartos, Jan Tis, Taleb Ba Park, Wounjhang Huang, Shu-Wei Department of Electrical Computer and Energy Engineering University of Colorado Boulder80309 United States Material Science and Engineering Program University of Colorado Boulder80309 United States

We present progress towards an imaging magnetometer using a magneto-optical polymer nanocomposite thin film, experimentally demonstrating 29nT/√Hz sensitivity with © Optica Publishing Group 2024, © 2024 The... 详细信息

关键词： Heterodyne detection

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