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arXiv 2020年

作者： Liu, Yingxia Pu, Li Yang, Yong He, Quanfeng Zhou, Ziqing Tan, Chengwen Zhao, Xiuchen Zhang, Qingshan Tu, K.N. Dept. of Materials Science and Engineering Beijing Institute of Technology Beijing China Dept. of Mechanical Engineering City University of Hong Kong Hong Kong China Dept. of Materials Science and Engineering City University of Hong Kong Hong Kong China Dept. of Materials Science and Engineering University of California Los Angeles United States

SnBiInZn based high entropy alloy (HEA) was studied as a low reflow temperature solder with melting point around 80 oC. The wetting angle is about 52o after reflow at 100 oC for 10 min. The interfacial intermetallic compound (IMC) growth kinetics was measured to be ripening-control with a low activation energy about 18.0 kJ/mol, however, the interfacial reaction rate is very slow, leading to the formation of a very thin IMC layer. The low melting point HEA solder has potential applications in advanced electronic packaging technology, especially for bio-medical devices. Copyright © 2020, The Authors. All rights reserved.

关键词： Entropy

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Thermophysical properties of graphene-based nanofluids

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International Journal of Thermofluids 2021年 10卷

作者： Elsaid, Khaled Abdelkareem, Mohammad Ali Maghrabie, Hussein M. Sayed, Enas Taha Wilberforce, Tabbi Baroutaji, Ahmad Olabi, A.G. Chemical Engineering Program Texas A& M University College StationTX United States Dept. of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box 27272 Sharjah United Arab Emirates Center for Advanced Materials Research University of Sharjah PO Box 27272 Sharjah United Arab Emirates Chemical Engineering Department Minia University Elminia Egypt Department of Mechanical Engineering Faculty of Engineering South Valley University Qena83521 Egypt Mechanical Engineering and Design Aston University School of Engineering and Applied Science Aston Triangle BirminghamB4 7ET United Kingdom School of Engineering Faculty of Science and Engineering University of Wolverhampton Telford United Kingdom

Heat transfer operations are very common in the process industry to transfer a huge amount of thermal energy, i.e., heat, from one fluid to another for different purposes. Many fluids are used as heat transfer fluid (HTF), in which water is the most common HTF due to its high specific heat, availability, and affordability. However, conventional HTFs, including water, have a lower thermal conductivity, which is the most critical thermophysical property, hence decreased heat transfer efficiency. The addition of solid particles of highly thermally conductive material, specifically at nano-size, i.e., nanoparticles NPs, result in nanofluid NF, which has evolved over the last two decades as efficient HTF and have been investigated in a wide range of applications. Among NPs, graphene (Gr) based materials have shown very high potential as NF due to the very high thermal conductivity up to 5,000 W/m.K, hence higher thermal conductivity NF. This work aims to thoroughly discuss the thermophysical properties of Gr-based NFs, including thermal conductivity, heat capacity, density, and viscosity. The discussion focus on the thermophysical properties as it is the ultimate determinator of the heat transfer characteristics of the HTF, such as the convective and the overall heat transfer coefficient as well as the heat transfer capacity of the NF. The discussion expands to the relative enhancement in such thermophysical properties reaching up to a 40% increase in thermal conductivity, as the most critical thermophysical property. The discussion shows that Gr-based NF has a much higher thermal conductivity relative to widely studied metal oxide NF and at much lower content, and lower density and viscosity increase, which is critical for determining the pumping power requirements. Critical challenges facing the application of Gr-based NFs such as cost, stability, increased density and viscosity, and environmental impacts are thoroughly discussed with mitigation recommendations given.

关键词： Graphene

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Towards establishing best practice in the analysis of hydrogen and deuterium by atom probe tomography

arXiv

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arXiv 2024年

作者： Gault, Baptiste Saksena, Aparna Sauvage, Xavier Bagot, Paul Aota, Leonardo S. Arlt, Jonas Belkacemi, Lisa T. Boll, Torben Chen, Yi-Sheng Daly, Luke Djukic, Milos B. Douglas, James O. Duarte, Maria J. Felfer, Peter J. Forbes, Richard G. Fu, Jing Gardner, Hazel M. Gemma, Ryota Gerstl, Stephan S.A. Gong, Yilun Hachet, Guillaume Jakob, Severin Jenkins, Benjamin M. Jones, Megan E. Khanchandani, Heena Kontis, Paraskevas Kramer, Mathias Kuhbach, Markus Marceau, Ross K.W. Mayweg, David Moore, Katie L. Nallathambi, Varatharaja Ott, Benedict C. Poplawsky, Jonathan D. Prosa, Ty Pundt, Astrid Saha, Mainak Schwarz, Tim M. Shang, Yuanyuan Shen, Xiao Vrellou, Maria Yu, Yuan Zhao, Yujun Zhao, Huan Zou, Bowen Max Planck Institute for Sustainable Materials Max-Planck-Straé 1 Dusseldorf Germany Department of Materials Imperial College London Royal School of Mines Prince Consort Rd South Kensington LondonSW7 United Kingdom Univ Rouen Normandie INSA Rouen Normandie CNRS Groupe de Physique des Materiaux UMR6634 Rouen76000 France Department of Materials University of Oxford Parks Road OxfordOX1 3PH United Kingdom University of Gottingen Institute for Materials Physics GottingenD-37077 Germany Leibniz-Institute for Materials Engineering-IWT Badgasteiner Straé 3 Bremen28359 Germany MAPEX Center for Materials and Processes Universitat Bremen Bibliothekstraé 1 Bremen28359 Germany Hermann-von-Helmholtz-Platz 1 Eggenstein-LeopoldshafenD-76344 Germany Australian Centre for Microscopy and Microanalysis The University of Sydney Australia School of Materials Science and Engineering Nayang Technological University Singapore Singapore School of Geographical and Earth Sciences University of Glasgow Glasgow United Kingdom University of Belgrade Faculty of Mechanical Engineering Kraljice Marije 16 Belgrade11120 Serbia Department of Materials Science & Engineering Institute I: General Materials Properties Friedrich-Alexander-Universitat Erlangen-Nurnberg Erlangen Germany Quantum Foundations and Technologies Group School of Mathematics and Physics University of Surrey United Kingdom Department of Mechanical and Aerospace Engineering Monash University Melbourne Australia Materials Science and Engineering UK Atomic Energy Authority Culham Science Centre Oxfordshire Abingdon United Kingdom Dept. of Applied Chemistry Tokai University Kanagawa259-1292 Japan Micro/Nano Technology Center Tokai University Kanagawa259-1292 Japan Scientific Center for Optical and Electron Microscopy ETH Zurich Zurich8093 Switzerland Department of Physics Chalmers University of Technology GoteborgSE-412 96 Sweden National Nuclear Laboratory Windscale Laboratory Sellafield Seascale

As hydrogen is touted as a key player in the decarbonization of modern society, it is critical to enable quantitative H analysis at high spatial resolution if possible at the atomic scale. Indeed, H has a known deleterious impact on the mechanical properties (strength, ductility, toughness) of most materials that can hinder their use as part of the infrastructure of a hydrogen-based economy. Enabling H mapping, including local hydrogen concentration analyses at specific microstructural features, is essential for understanding the multiple ways that H affect the properties of materials, including for instance embrittlement mechanisms and their synergies, but also spatial mapping and quantification of hydrogen isotopes is essential to accurately predict tritium inventory of future fusion power plants, ensuring their safe and efficient operation for example. Atom probe tomography (APT) has the intrinsic capabilities for detecting hydrogen (H), and deuterium (D), and in principle the capacity for performing quantitative mapping of H within a material s microstructure. Yet the accuracy and precision of H analysis by APT remain affected by the influence of residual hydrogen from the ultra-high vacuum chamber that can obscure the signal of H from within the material, along with a complex field evaporation behavior. The present article reports the essence of discussions at a focused workshop held at the Max-Planck Institute for Sustainable materials in April 2024. The workshop was organized to pave the way to establishing best practices in reporting APT data for the analysis of H. We first summarize the key aspects of the intricacies of H analysis by APT and propose a path for better reporting of the relevant data to support interpretation of APT-based H analysis in materials. Copyright © 2024, The Authors. All rights reserved.

关键词： Hydrogen

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Impact of microplastics on terrestrial ecosystems: A plant-centric perspective

Environmental Pollution and Management

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Environmental Pollution and Management 2024年 1卷 223-234页

作者： Md Mehedee Hasan Most Nishat Tarannum Gazi A.K.M. Rafiqul Bari Ashikur Rahman Swapon Md Shahjahan Kabir Shakil Ahmmed Md. Daraj Uddin Prodhan Department of Agricultural Chemistry Chonnam National University Gwangju 61186 South Korea Department of Fisheries Hajee Mohammad Danesh Science and Technology University Dinajpur Bangladesh School of Mechanical Smart and Industrial Engineering Gachon University 1342 Seongnam-daero Sujeong-gu Seongnam-si 13120 Gyeonggi-do Republic of Korea Department of Convergence Biosystems Engineering College of Agriculture and Life Sciences Chonnam National University Gwangju Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Republic of Korea Department of Food Processing and Preservation Hajee Mohammad Danesh Science and Technology University Dinajpur Bangladesh Department of Biochemistry and Molecular Biology Bangladesh Agricultural University Mymensingh 2202 Bangladesh Dept. of Genetics and Plant Breeding Sher-e-Bangla Agricultural University Dhaka 1207 Bangladesh

Microplastics (MPs), defined as plastic particles smaller than five millimeters, are pervasive environmental pollutants affecting ecosystems from aquatic habitats to terrestrial soils. While extensive research has been conducted on MPs contamination in marine environments, the impacts of MPs in agricultural soils, particularly on plant health, remain underexplored. This review presents a comprehensive analysis of MPs contamination sources, pathways, and effects on soil properties and plant systems, focusing on MPs unique mechanisms of translocation within plants. By examining the role of MPs in disrupting soil structure, microbial communities, and plant growth, this paper identifies critical knowledge gaps and highlights the ecological risks of MPs presence in agricultural settings. Unlike prior reviews, this work provides a plant-centric perspective, addressing MPs uptake, translocation, and accumulation within plant tissues, and proposes novel mitigation strategies such as biodegradable alternatives and advancements in waste management. Furthermore, we discuss the implications of MPs interactions with heavy metals and other pollutants in soil, which may amplify toxicity in plant systems and impact overall soil fertility. This review aims to inform future research directions and policy-making efforts to mitigate the adverse effects of MPs in terrestrial ecosystems, with significant implications for agricultural productivity, soil health, and long-term food security.

关键词： Microplastics Soil contamination Plant health Agricultural productivity Environmental pollution

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Structure of AlN on Si (111) Deposited with Metal Organic Vapor Phase Epitaxy

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MRS Internet Journal of Nitride Semiconductor Research 2020年第1期4卷 322-326页

作者： Rehder, Eric Zhou, M. Zhang, L. Perkins, N. R. Babcock, S. E. Kuech, T. F. Materials Science Program University of Wisconsin -Madison Madison USA Dept. of Materials Science University of Wisconsin -Madison Madison USA Dept. of Chemical Engineering University of Wisconsin -Madison Madison USA

The surface morphology and structure of AlN deposited by metal organic vapor phase epitaxy (MOVPE) on Si (111) at growth temperatures ranging from 825 to 1175°C was investigated. Transmission electron microscopy (TEM), reflection high energy electron diffraction (RHEED), atomic force microscopy (AFM), and secondary ion mass spectrometry (SIMS) techniques were used to study the resulting film structure. Growth at high temperatures but less than ∼1100°C, resulted in a wire texture with some degree of in-plane alignment with (0001)AlN/ /(111)Si, < 10 $$\bar 1$$ 0>AlN//< $$\bar 2$$ 11>Si, and 11 $$\bar 2$$ 0>AlN//< $$\bar 1$$ 10>Si. Deposition at temperatures greater than 1100°C results in single crystal films consisting of domains 60 nm across with an aspect ratio near unity. Growth below1100°C leads to degraded crystal quality with the grains developing random rotational misalignments around the AlN [0001] axis. Growth at lower temperatures produces islands elongated along the [11 $$\bar 2$$ 0] direction. At the growth temperature of 825°C, the aspect ratio of the islands increased to 3 and a width of 25 nm. Cross-sectional TEM reveals that these islands are faceted due to slow growth on the {1 $$\bar 1$$ 01}planes.

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Non-Invasive Coronary Ct Angiography-Derived Fractional Ow Reserve: A Benchmark Study Comparing the Diagnostic Performance of Four Different Computational Methodologies

SSRN

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SSRN 2024年

作者： Bourantas, Georgios C. Zwick, Benjamin Siogkas, Panagiotis Sakellarios, Antonis A. Katsanos, Konstantinos Burganos, Vasilios N. Miller, Karol Tsigkas, Grigorios Davlouros, Periklis Fotiadis, Dimitrios I. University of Patras Department of Agriculture New buildings Messolonghi 30200 Greece Intelligent Systems for Medicine Laboratory School of Engineering The University of Western Australia 35 Stirling Highway PerthWA Australia Medlytic Labs Patras Greece Department of Mechanical Engineering and Aeronautics University of Patras Rio26504 Greece Department of Interventional Radiology School of Medicine University Hospital of Patras Patras Greece PatrasGR-26504 Greece Department of Cardiology School of Medicine University of Patras Patras Greece Unit of Medical Technology and Intelligent Information Systems Dept. of Materials Science and Engineering University of Ioannina Ioannina Greece Foundation for Research and Technology-Hellas Biomedical Research Institute Ioannina Greece University of Ioannina Greece

We benchmark the diagnostic performance of four distinct numerical methodologies for assessing the functional significance of obstructive coronary lesions using coronary computed tomography angiography (CCTA) data. Specifically, we non-invasively compute the fractional ow reserve (FFR) index by applying an established mathematical formula for pressure drop calculation, utilizing the geometrical data (centerlines) from a limited data set of 14 vessels from 10 patients. We compare the FFR values obtained using our mathematical formula-based approach with those obtained using 0D-1D numerical models. Our approach is fast (less than 5 seconds) and straightforward compared to the other methods. The clinical data used in the FFR work ow are publicly available. © 2024, The Authors. All rights reserved.

关键词： Numerical methods

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Fabrication and anisotropic electrical property for oriented ceramic of Li-(Nb,Ta)-Ti-O system under high-magnetic field

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2020年第4期67卷 208-212页

作者： Nakano, Hiromi Suzuki, Tohru Kan, Akinori Toyohashi University of Technology CRFC Center 1-1 Hibarigaoka Tempaku-cho Toyohashi441-8580 Japan National Institute for Materials Science Research Center for Functional Materials 1-2-1 Sengen Tsukuba305-0047 Japan Meijo University Dept. Vehicle and Mechanical Engineering 1-501 Shiogamaguchi Tempaku-ku Nagoya468-8502 Japan

The Li1+x-y(Nb,Ta)1-x-3yTix+4yO3 (0.06 ≤ x ≤ 0.33, 0 ≤ y ≤ 0.09) forms a unique and periodical structure as a superstructure. In this work, toward application of the unique qualities of an electro-ceramic, we fabricated oriented bulk ceramics by slip casting in a strong magnetic field of 12 T. The c-axis of the powders was aligned parallel to the magnetic field. As a result, we found anisotropic- electric properties which were caused by a superstructure with intergrowth layers of corundum-type [Ti2O3]2+. In the Li-Nb-Ti-O system, the Qf value parallel to the c-axis was about five times greater than that of perpendicular to the c-axis. We concluded from our analytical and simulation results that the large Qf value parallel to the c-axis was caused from a combination of two factors;one being the anisotropic electron conductivity and the other the anisotropic bonding strength in the superstructure by insertion of the intergrowth layer. © 2020 Japan Society of Powder and Powder Metallurgy.

关键词： Corundum

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Effect of Ni and Sr additions on the microstructure, mechanical properties, and coefficient of thermal expansion of Al-23%Si alloy

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materials Today: Proceedings 2021年 46卷 2732-2736页

作者： Vijeesh Vijayan M. Ravi K Narayan Prabhu Department of Mechanical Engineering N.M.A.M Institute of Technology (Autonomous College Under V.T.U) Nitte Karkala 574110 India Materials Science and Technology Division CSIR- National Institute for Interdisciplinary Science and Technology Thiruvananthapuram Kerala 695019 India Dept. of Metallurgical and Materials Engineering National Institute of Technology Surathkal Srinivasnagar Mangalore Karnataka 575025 India

In this paper, the combined and individual effect of strontium (Sr) and nickel (Ni) additions on the microstructure and mechanical properties of hypereutectic Al-23Si alloy was studied using an optical microscopy, universal tensile testing machine and Brinell hardness tester. The wear properties and coefficient of thermal expansion of the melt treated samples were determined using pin on disc wear testing machine and linear expansion measurement unit respectively. The results indicate that the Ni additions significantly enhanced the mechanical properties of the alloy, whereas, presence of Sr was detrimental. It was observed that the improvement in mechanical properties due to Ni was primarily due to refinement and transformation of the star shaped primary silicon into polyhedral crystals. However, the addition of Sr, both as separate and when combined with Ni, transformed the primary silicon into a faceted crystal and hence decreased the mechanical property. Among all, the Ni melt treated alloy samples showed lowest wear rate and coefficient of thermal expansion.

关键词： Hypereutectic Al-Si alloy T6 heat treatment Wear Refinement Modification

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G and GO interaction into TiO2 (010) anatase and its influence on the bandgap: DFT Study

G and GO interaction into TiO2 (010) anatase and its influen...

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International Conference on Electrical engineering, Computing science and Automatic Control (CCE)

作者： Francisco J. Cano Oleksandr Korolevych Malgorzata Makowska-Janusik Sandrine Coste A. Ashok S. Velumani A. Kassiba Institute of Molecules & Materials of Le Mans Le Mans Universite France Programa de Nanociencias y Nanotecnologia CINVESTAV-IPN Mexico Faculty of Science and Technology Jan Dlugosz University Częstochowa Poland Instituto de Fisica UNAM Mexico Departamento de Ingenieria Electrica (SEES) CINVESTAV-IPN Mexico J. Mike Walker ‘66 Dept. of Mechanical Engineering Texas A&M University USA

In this work, density functional theory (DFT) calculations were used to investigate the effect of graphene (G) and graphene oxide (GO) on the electronic properties of TiO 2 . Initially, a bandgap of 3.23 eV was determined for pure anatase TiO 2 layers. Subsequently, with the incorporation of G and GO, a possible hybridization effect of the electron states at the interface was observed, leading to the formation of new intermediate energy bands not originally found in TiO 2 . This condition causes the bandgap of the hybrid material to be reduced. Our calculations further showed how both structures interact with the TiO 2 surface, providing valuable information that offers opportunities to optimize the interfaces and improve the performance of these materials in various applications.

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Room-Temperature B-Doped Nanodiamond Composite Hard Coatings: mechanical, Structural, and Tribological Properties

SSRN

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SSRN 2022年

作者： Egiza, Mohamed Ali, Ali M. Murasawa, Koki Yoshitake, Tsuyoshi Department of Mechanical Engineering Kafrelsheikh University Kafrelsheikh33516 Egypt Department of Applied Science for Electronics and Materials Kyushu University Fukuoka Kasuga816-8580 Japan Dept. of Physics Al-Azhar University Cairo11884 Egypt OSG Corporation 2-17 Shirakumo-cho Aichi Toyokawa-shi442-0018 Japan

The effects of B-doping on the tribological, mechanical, and structural properties of nanodiamond composite (NDC) coatings deposited on cemented carbide (WC-Co) substrates by coaxial arc plasma deposition are studied. The results showed degraded films hardness by increasing B concentrations by 0 at.%, 1 at.%, 5 at.%, and 10 at.% as following 51 GPa, 35 GPa, 27GPa, and 25 GPa, respectively, which is attributed to films graphitization. The films graphitization is induced by the catalytic effects of Co atoms that diffused from the substrate into the films. The diffusion of Co atoms hardly occurs during the deposition of undoped NDC films. Therefore, an undoped NDC buffer layer was deposited before the deposition of 1 at.% B-doped films, which improved the hardness from 35 GPa to 58 GPa, and enhanced the wear resistance because the B atoms facilitate the formation of strong C-C sp3 bonds. Due to B doping, the sliding behaviour is improved by achieving a stabilized low friction coefficient of 0.08 against the Al2O3 counterpart. It was found that, by suppressing Co-catalytic effects, B doping enhances wear resistance, hardness, and sliding behaviour of NDC films. B-doped NDC films are a promising hard coating for machining difficult-to-cut materials. © 2022, The Authors. All rights reserved.

关键词： Wear resistance

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