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IEEE Conference on Nanotechnology

作者： Yao-Tien Tseng Russell Clemente Jing-Chie Lin Institute of Materials Science and Engineering National Central University Taoyuan Taiwan International Master Program in Applied Materials Science National Central University Taoyuan Taiwan

In this study, steric Zn-Ni alloy columns were fabricated via microanode-guided electroplating (MAGE), which had a very small electrode gap (90 µm) and a very high deposition rate (> 2 µm/min). These microcolumns were used to produce hydrogen by the electrocatalytic decomposition of water in alkaline aqueous solutions of 1 M KOH. The surface morphology study was acquired via the SEM, and after numerous electrocatalytic reactions, the porous structure of the Zn-Ni alloy progressively developed on the surface. The amount of zinc present in the alloy fell from 91 at. % to 52 at. %, which resulted in the column diameter of Zn-Ni increasing from 248 to 300 µm. After conducting an XRD investigation, the primary structure of the Zn-Ni alloy microcolumn was determined to be that of an intermetallic compound belonging to the Zn-Ni series. The phases shifted from Ni 3 Zn 22 to Ni 2 Zn 11 and NiZn 3 when the percentage of zinc in the alloy decreased from 91 to 52 at. %. The results of the linear sweep voltammetry showed that the Zn-Ni alloy microcolumns exhibited good hydrogen production efficiency at 13–24 at.% Ni, the lowest Tafel slope of 45 mV/dec, and only 36 mV overpotential when operating at 10 mA/cm 2 current density. Because of the enormous number of nano-networked nickel hydroxide on the surface that was investigated by TEM, the excellent efficiency with which hydrogen was produced can be attributed to the fact that this resulted in a significant increase in the amount of electrochemical surface area available.

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Energy Production Techniques - An Overview

Energy Production Techniques - An Overview

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IEEE International Conference on Emerging & Sustainable Technologies for Power & ICT in a Developing Society (NIGERCON)

作者： Sunday Adeniran. Afolalu Temitayo Samson. Ogedengbe Moses. Emetere Elewa R. Remilekun Ogunnigbo Charles Olawale Lodewyk Willem Beneke Mechanical and Mechatronics Engineering Department Afe Babalola University Ado-Ekiti Ado-Ekiti Nigeria Department of Mechanical Science University of Johannesburg Johannesburg South Africa Mechanical Engineering Department Nile University of Nigeria Abuja Physics Program. Bowen University Iwo Osun State Nigeria Department of Mechanical Engineering Faculty of Engineering and Built Environment Tshwane University of Technology Pretoria South Africa

ISBN: (数字)9798331542559

ISBN: (纸本)9798331542566

Green Hydrogen (GH) has emerged as a very promising medium for transporting environmentally friendly energy. The integration of H 2 -based energy capacity frameworks and fuel cells with other sustainable energy sources has been facilitated by the use of H 2 as the primary operational medium, making such integration extremely cost-effective. This report presents an outline of the ebb and flow movements inside the field of GH age techniques using water electrolyzers energized by sustainable power sources. This review focuses on solar and hydrogen energy generation. The role of these energy types as well as the challenges with their generation has also been discussed. Hydrogen can be used to produce electricity in a variety of ways, including fuel cells and gas turbines. If made cheaper than its fossil fuel alternatives, this would be an incentive for power-producing companies to go green.

关键词： Hydraulic turbines Humanities Reviews Electricity Green products Fuel cells Production Green hydrogen Fossil fuels Water resources

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High-entropy carbide ceramics: a perspective review

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Tungsten 2021年第2期3卷 131-142页

作者： Zhe Wang Zhong-Tao Li Shi-Jun Zhao Zheng-Gang Wu College of Materials Science and Engineering and Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan UniversityChangsha 410082China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China

High-entropy carbide ceramics(HECCs)exhibited a series of property superiority,such as high hardness,high oxidation resistance and adjustable range of thermal conductivity,making them great candidates for structural materials used in extreme service ***,current HECC-related reports can only provide limited guidance for the design of HECC materials with promising properties and stable structure or for their high-quality *** fill this gap,we proposed in the current review that integrated efforts should be taken in the following three aspects to advance the design and fabrication of high-performance ***,the rule for the single-phase formation needs to be theoretically identified using high-throughput density functional theory calculations(HTDFT)and a highly accurate predictive model for rapid compositional design warrants establishment through the combination of HTDFT and machine-learning *** parallel with the compositional design,the lack of theoretical foundation and guidance for the synthesis of highly dense and highly pure HECC materials necessitates extensive studies focusing on the principle for the synthesis of HECC pre-alloy powders and on the powder densification mechanisms during high-temperature ***,great attentions are to be paid to the mechanistic understandings on the mechanical,oxidation and thermal conduction behaviors of HECC materials;for example,the toughening and strengthening mechanisms of HECC materials could be elucidated through discerning the"HECC composition-stacking fault energy distribution/bonding state-dislocation behavior"correlations.

关键词： High-entropy carbide ceramics Phase formation mechanical property Oxidation behavior Thermal conduction Fabrication

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A super wear-resistant coating for Mg alloys achieved by plasma electrolytic oxidation and discontinuous deposition

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Journal of Magnesium and Alloys 2023年第8期11卷 2939-2952页

作者： Xixi Dong Mingxu Xia Feng Wang Hailin Yang Gang Ji E.A.Nyberg Shouxun Ji College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Brunel Centre for Advanced Solidification Technology(BCAST) Brunel University LondonUxbridge UB83PHUK School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Metallurgy and Materials University of BirminghamBirmingham B152TTUK State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Univ.Lille CNRSINRAECentrale LilleUMR 8207-UMET-UnitéMatériaux et TransformationsF-59000 LilleFrance Kaiser Aluminum Spokane ValleyWA 99216USA

Magnesium alloys are lightweight materials with great potential,and plasma electrolytic oxidation(PEO)is effective surface treatment for necessary improvement of corrosion resistance of magnesium ***,the∼14µm thick and rough PEO protection layer has inferior wear resistance,which limits magnesium alloys as sliding or reciprocating parts,where magnesium alloys have special advantages by their inherent damping and denoising properties and attractive *** a novel super wear-resistant coating for magnesium alloys was achieved,via the discontinuous sealing(DCS)of a 1.3µm thick polytetrafluoroethylene(PTFE)polymer layer with an initial area fraction(A_(f))of 70%on the necessary PEO protection layer by selective spraying,and the wear resistance was exceptionally enhanced by∼5500 times in comparison with the base PEO *** initial surface roughness(Sa)under PEO+DCS(1.54µm)was imperfectly 59%higher than that under PEO and conventional continuous sealing(CS).Interestingly,DCS was surprisingly 20 times superior for enhancing wear resistance in contrast to *** induced nano-cracks that splitted DCS layer into multilayer nano-blocks,and DCS also provided extra space for the movement of nano-blocks,which resulted in rolling friction and nano ***,DCS promoted mixed wear of the PTFE polymer layer and the PEO coating,and the PTFE layer(HV:6 Kg·mm^(−2),A_(f):92.2%)and the PEO coating(HV:310 Kg·mm^(−2),A_(f):7.8%)served as the soft matrix and the hard point,***,the dynamic decrease of Sa by 29%during wear also contributed to the super wear *** strategy of depositing a low-frictional discontinuous layer on a rough and hard layer or matrix also opens a window for achieving super wear-resistant coatings in other materials.

关键词： Magnesium alloy Coating Plasma electrolytic oxidation Discontinuous deposition Wear resistance Mechanism

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A Griffith description of fracture for non-monotonic loading with application to fatigue

arXiv

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arXiv 2024年

作者： Saha, Subhrangsu Dolbow, John E. Lopez-Pamies, Oscar Department of Civil and Environmental Engineering University of Illinois Urbana–ChampaignIL61801 United States Department of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States

With the fundamental objective of establishing the universality of the Griffith energy competition to describe the growth of large cracks in solids not just under monotonic but under general loading conditions, this paper puts forth a generalization of the classical Griffith energy competition in nominally elastic brittle materials to arbitrary non-monotonic quasistatic loading conditions, which include monotonic and cyclic loadings as special cases. Centered around experimental observations, the idea consists in: i) viewing the critical energy release rate Gc not as a material constant but rather as a material function of both space X and time t, ii) one that decreases in value as the loading progresses, this solely within a small region Ω(t) around crack fronts, with the characteristic size of such a region being material specific, and iii) with the decrease in value of Gc being dependent on the history of the elastic fields in Ω(t). By construction, the proposed Griffith formulation is able to describe any Paris-law behavior of the growth of large cracks in nominally elastic brittle materials for the limiting case when the loading is cyclic. For the opposite limiting case when the loading is monotonic, the formulation reduces to the classical Griffith formulation. Additional properties of the proposed formulation are illustrated via a parametric analysis and direct comparisons with representative fatigue fracture experiments on a ceramic, mortar, and PMMA. © 2024, CC BY-NC-ND.

关键词： Brittleness

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Oil-Infused Slippery Surface on Al Substrates Fabricated by Chemical Etching 2

Oil-Infused Slippery Surface on Al Substrates Fabricated by ...

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2021 2nd International Conference on Internet of Things, Artificial Intelligence and mechanical Automation, IoTAIMA 2021

作者： Wang, Qiulin Wu, Song Zhang, Haoqun Sun, Jing Pan, Weihao School of Mechanical Engineering Dalian University of Technology Dalian116024 China School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

In recent years, the oil-infused slippery surfaces inspired by Nepenthes pitcher have potential applications in domestic and industrial fields due to their excellent water repellence. However, the current preparation methods of the oil-infused slippery surfaces have the disadvantages of time-consuming, expensive equipment and complex processes. In our research, we reported an approach to prepare the oil-infused slippery surface with multi-functional applications by simple chemical etching. First, Al plates were etched by hydrochloric acid solution and modification with lower surface energy. Then, the as-prepared samples were immersed into the lubricant oil. After that, the oil-infused slippery surface with a water slide-off angle of 3° was obtained. The freezing rain tests, chemical stability tests, and self-cleaning tests were conducted on original Al plate and the as-prepared sample. This work will enrich the preparation methods of the oil-infused slippery surfaces. © Published under licence by IOP Publishing Ltd.

关键词： Chemical stability

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Investigation of Rheological and Tribological Properties of Garlic Oil Filled Grease Developed from Waste Cooking Oil

SSRN

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SSRN 2024年

作者： Malik, Aamir Hameed Khan, M. Jebran Wani, M.F. Saleem, Sheikh Shahid Parray, Mohammad Arif Department of Mechanical Engineering SSM College of Engineering Parihaspora Kashmir Pattan India Islamic University of Science and Technology Awantipora Kashmir Pulwama India Tribology Laboratory Department of Mechanical Engineering National Institute of Technology Kashmir Srinagar India Department of Metallurgical and Materials Engineering National Institute of Technology Kashmir Srinagar India

The rheological and tribological performances of waste cooking oil as base oil-based grease with and without additive were assessed as per the ASTM standards. The addition of 6% garlic oil as an extreme pressure additive increased the weld load of waste cooking oil-based grease from 1560N to 2450N. The average wear scar diameter of WCO based grease is 13.87% which is lower than commercial grease and the average wear scar diameter of WCO + (GO + 6 wt.%) grease is 19.30%. The experiments were conducted at a temperature of 45 °C with different shear rates. The results shows that rheological properties of the waste cooking oil-based grease increase with the increase in the concentration of lithium soap. © 2024, The Authors. All rights reserved.

关键词： Welds

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Gradient-based Design of Computational Granular Crystals

arXiv

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arXiv 2024年

作者： Parsa, Atoosa O'Hern, Corey S. Kramer-Bottiglio, Rebecca Bongard, Josh Department of Computer Science University of Vermont BurlingtonVT United States Department of Mechanical Engineering and Materials Science Yale University New HavenCT United States

There is growing interest in engineering unconventional computing devices that leverage the intrinsic dynamics of physical substrates to perform fast and energy-efficient computations. Granular metamaterials are one such substrate that has emerged as a promising platform for building wave-based information processing devices with the potential to integrate sensing, actuation, and computation. Their high-dimensional and nonlinear dynamics result in nontrivial and sometimes counter-intuitive wave responses that can be shaped by the material properties, geometry, and configuration of individual grains. Such highly tunable rich dynamics can be utilized for mechanical computing in special-purpose applications. However, there are currently no general frameworks for the inverse design of large-scale granular materials. Here, we build upon the similarity between the spatiotemporal dynamics of wave propagation in material and the computational dynamics of Recurrent Neural Networks to develop a gradient-based optimization framework for harmonically driven granular crystals. We showcase how our framework can be utilized to design basic logic gates where mechanical vibrations carry the information at predetermined frequencies. We compare our design methodology with classic gradient-free methods and find that our approach discovers higher-performing configurations with less computational effort. Our findings show that a gradient-based optimization method can greatly expand the design space of metamaterials and provide the opportunity to systematically traverse the parameter space to find materials with the desired functionalities. © 2024, CC BY-NC-ND.

关键词： Granular materials

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Anomalous thermal conductivity in 2D silica nanocages of immobilizing noble gas atom

arXiv

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arXiv 2024年

作者： Wang, Yang Gao, Zhibin Wang, Xiaoying Sun, Jinping Feng, Minxuan Hao, Yuzhou Li, Xuejie Zhao, Yinchang Ding, Xiangdong State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi’an Jiaotong University Xi’an710049 China School of Materials Science and Engineering Harbin Institute of Technology at Weihai 2 West Wenhua Road Weihai264209 China Department of Physics Yantai University Yantai264005 China

Noble gas atoms, such as Kr and Xe are byproducts of nuclear fission in nuclear plants. How to trap and confine these volatile even radioactive gases is particularly challenging. Recent studies have shown that they can be trapped in nanocages of ultrathin silica. Here we exhibit with self-consistent phonon (SCP) theory and four-phonon (4ph) scattering where the adsorption of noble gases results in an anomalous increase in lattice thermal conductivity (κL), while the presence of Cu atoms doping leads to a reduction in κL. We trace this behavior in host-guest 2D silica to an interplay of tensile strain, rattling phonon modes, and redistribution of electrons. We also find that 4ph scatterings play indispensable roles in κL of 2D silica. Our work illustrates the microscopic heat transfer mechanism in 2D silica nanocages with the immobilization of noble gas atoms and inspires further exploring materials with the kagome and glasslike κL © 2024, CC BY.

关键词： Silica

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A novel aluminum-carbon nanotubes nanocomposite with doubled strength and preserved electrical conductivity

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Nano Research 2021年第8期14卷 2776-2782页

作者： Shuai Zhang Gaoqiang Chen Timing Qu Jinquan Wei Yufan Yan Qu Liu Mengran Zhou Gong Zhang Zhaoxia Zhou Huan Gao Dawei Yao Yuanwang Zhang Qingyu Shi Hua Zhang State Key Laboratory of Tribology Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaDepartment of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Lab for Advanced Materials Processing Technology of Education Ministry School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Loughborough materials characterization center Department of materialsLoughborough UniversityLoughboroughLEU 3TUUK State Key Laboratory of Special Cable Technology Shanghai Electric Cable Research Institute Co.Ltd.Shanghai 200093China School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing 102617China

Enhancing the mechanical strength of highly conductive pure metals usually causes significant reduction in their electrical *** example,introducing phase/matrix interfaces or more grain boundaries,are common and effective methods to strengthen *** it simultaneously increases the electron scattering at the interface,thus reducing the electrical *** this study,we demonstrate that pure aluminum(Al)/carbon nanotubes(CNTs)nanocomposites prepared by friction stir processing have successfully broken through these *** yield strength and tensile strength of Al/CNTs nanocomposites have improved by 104.7%and 51.8%compared to pure Al,while the electrical conductivity remained comparable to that of pure *** explore the potential mechanisms,the interface between CNTs and Al was examined and characterized by transmission electron microscopy(TEM)and Raman *** interfacial reaction compounds were present and no visible physical gaps were observed at CNTs and Al *** defined it as a clean and tightly bonded *** the quantity of phase interface has increased,the electrical conductivity of the nanocomposite remains approximately *** attribute the preserved electrical conductivity to the clean and tightly bonded CNTs/Al interface in the nanocomposite.

关键词： carbon nanotubes/aluminum nanocomposites mechanical properties electrical conductivity friction stir processing interface

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