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Evaluation of the Influence of Eggshell (ES) Concentration on the Degradation Behavior of Mg-2.5Zn Biodegradable Alloy in Simulated Body Fluid

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ACS Biomaterials science and engineering 2023年第5期9卷 2376-2391页

作者： Radwan, A. Bahgat Okonkwo, Paul C. Murugan, Srinivasan Parande, Gururaj Taryba, Maryna Montemor, M. Fatima Al-Mansoori, Layla Elrayess, Mohamed A. Al-Qahtani, Noora Gupta, Manoj Youssef, Khaled M. Case, Raymundo Shakoor, R.A. Abdullah, Aboubakr M. Center for Advanced Materials Qatar University Doha2713 Qatar Department of Mechanical and Mechatronics Engineering Dhofar University Salalah211 Oman Mahendra Engineering College Tamil Nadu Namakkal637503 India Department of Mechanical Engineering National University of Singapore 9 Engineering Drive 1 Singapore117576 Singapore Centro de Quimica Estrutural Instituto Superior Técnico Universidade de Lisboa Avenida Rovisco Pais Lisboa1049-001 Portugal Qatar University Doha2713 Qatar Materials Science and Technology Graduate Program College of Arts and Sciences Qatar University Doha2713 Qatar Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States

Currently, permanent vascular stents are fabricated using titanium and stainless steel implants that are nondegradable and offer high stability, but they have certain disadvantages. For example, the prolonged exposition of aggressive ions in the physiological media and the existence of defects in the oxide film create conditions for corrosion to occur, thus triggering unwanted biological events and compromising the mechanical integrity of the implants. Moreover, when the implant does not need to be permanent, there is the need to submit the patient for a second surgery for implant removal. As a solution for nonpermanent implants, biodegradable magnesium alloys have been deemed a promising substitute, for example, for cardiovascular-related applications and the construction of orthopedic devices. A biodegradable magnesium alloy (Mg-2.5Zn) reinforced by zinc and eggshell was employed in this study as an environment-conscious magnesium (eco) composite (Mg-2.5Zn-xES). Disintegrated melt deposition (DMD) was used to fabricate the composite. Experimental studies were conducted to investigate the biodegradation performance of Mg-Zn alloys containing 3 and 7 wt % eggshell (ES) in simulated body fluid (SBF) at 37 °C. Different corrosion techniques were used to study the corrosion behavior of the Mg-2.5Zn-xES composites, including weight loss measurements, hydrogen evolution, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning vibrating electrode technique (SVET). Scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were employed to scrutinize the corroded surfaces’ morphology and composition. The outcomes indicated that Mg-2.5Zn-3ES possesses the lowest degradation activity. © 2023 American Chemical Society.

关键词： Electrochemical impedance spectroscopy

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Pulsing-Induced Healing of a Surface Crack of a Nickel-Based Alloy

SSRN

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SSRN 2024年

作者： Wang, Qian Quan, Mingming Tan, Zhen Liu, Ming Wang, Dianlong Yang, Xiao Liu, Ying Mao, Yaning Liang, Zhimin Yang, Fuqian Wang, Liwei School of Material Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China Hebei Key Laboratory of Material Near-Net Forming Technology Shijiazhuang050018 China School of Mechanical Engineering and Automation Fuzhou University Fuzhou350108 China HBIS Group Materials Institute HBIS Group Hebei Shijiazhuang050023 China Materials Program Department of Chemical and Materials Engineering University of Kentucky LexingtonKY40506 United States School of Material Science and Engineering Australia

In this work, we demonstrate the feasibility of applying electric pulses to heal surface cracks on Ni-based GH4169 alloy under compressive load. There exists an incubation time for the onset of the healing of a crack, which is associated with local temperature at the crack tip. The crack size decreases with increasing the pulsing time at a constant healing rate prior to complete healing of the crack. Increasing compressive load accelerates the healing process. The electric pulsing leads to the formation of an influential zone surrounding the crack with the finest grain sizes in the healed crack and the coarsest grain sizes away from the influential zone. The indentation hardness increases with the increase the distance to the crack tip of the healed crack. A model of viscous flow in the crack channel is proposed for the crack healing. The resultant force on the crack faces due to the crack healing increases with the increase of the healing time and the decrease of the crack width. © 2024, The Authors. All rights reserved.

关键词： Crack tips

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Assessment of mechanical and Antimicrobial Properties of Die-Cast Al Scrap-Cu Alloy for Contact Surface Application

Assessment of Mechanical and Antimicrobial Properties of Die...

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Advanced Innovations in Smart Cities (ICAISC), International Conference on

作者： Maruf Yinka Kolawole Jacob Olayiwola Aweda Sefiu Adekunle Bello Kamoru Olufemi Oladosu Zainab Motunrayo Saheed Department of Mechanical Engineering Kwara State University Malete Kwara State Nigeria Department of Mechanical Engineering University of University Ilorin Kwara State Nigeria Department of Material Science & Engineering Kwara State University Malete Kwara State Nigeria

ISBN: (数字)9798331506995

ISBN: (纸本)9798331507008

Contact surface bacterial infections are on the increase globally. Metallic silver and copper with excellent antibacterial properties have been reported in the literature but seldom use for structural application due to high cost and relative scarcity. In this work, Al-xwt%Cu alloys with 2.5, 7.5, 5.0, 10.0, 15.0, 20.0, and 25.0 wt% Cu were developed and produced via die-casting technique with mould pre-heating temperature of 300°C. mechanical and antimicrobial properties of the die-cast Al-xCu products were investigated following standard procedure. The results revealed an enhancement in tensile and compressive strength of the alloy with increase in wt% addition of Cu up to 20 wt% and thereafter decline. The peak yield tensile and compressive strength of 200.641 and 373.26 MPa which falls within the recommended value of 110–240 MPa for structural handrail contact surface application was recorded in the sample with 20% wt Cu addition in aluminum thus obtaining a 538 and 80% improvement respectively compared to control sample with 0% Cu. Results of antimicrobial property of the developed Al-xCu alloy antimicrobial property enhancement and the performance is dependent on the specific exposed bacteria strains and weight concentration of Cu. The efficacy of antibacterial assessment of Al-xCu alloy indicated the addition of Cu beyond 20 wt% relative to control sample within each bacteria yielded 238, 141, 95 and 94% antibacterial enhancement on Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli respectively. Hence Escherichia coli has more resistance to the antibacterial property of Al-xCu alloy

关键词： Technological innovation Temperature Surface resistance Metals Escherichia coli Antibacterial activity Copper Biofuels Strain Immune system

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Emerging semiconductor ionic materials tailored by mixed ionic-electronic conductors for advanced fuel cells

Advanced Powder Materials

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Advanced Powder materials 2024年第6期3卷 1-25页

作者： Bushra Bibi Atif Nazar Bin Zhu Fan Yang Muhammad Yousaf Rizwan Raza M.A.K.Yousaf Shah Jung-Sik Kim Muhammad Afzal Yongpeng Lei Yifu Jing Peter Lund Sining Yun School of Energy and Environment Southeast UniversityNanjing 210096China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Department of Physics COMSATS University IslamabadLahore CampusPakistan Sino-French Engineer School/School of General Engineering Beijing UniversityBeijing 100191China Department of Mechanical Engineering University of South CarolinaColumbiaSC 29208-4106USA State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Department of Material Science Shenzhen MSU-BIT UniversityShenzhen 518000China Department of Applied Physics Aalto UniversityOtakaari 2402150 EspooFinland Functional Materials Laboratory(FML) School of Materials Science and EngineeringXi'an University of Architecture and TechnologyXi'an 710055China

Mixed ionic-electronic conductors(MIECs)play a crucial role in the landscape of energy conversion and storage technologies,with a pronounced focus on electrode materials’application in solid oxide fuel cells(SOFCs)and proton-conducting ceramic fuel cells(PCFCs).In parallel,the emergence of semiconductor ionic materials(SIMs)has introduced a new paradigm in the field of functional materials,particularly for both electrode and electrolyte development for low-temperature,300–550℃,SOFCs,and *** review article critically delves into the intricate mechanisms underpinning the synergistic relationship between MIECs and SIMs,with a particular emphasis on elucidating the fundamental working principles of semiconductor ionic membrane fuel cells(SIMFCs).By exploring critical facets such as ion-coupled electron transfer/transport,junction effect,energy bands alignment,and theoretical computations,it casts an illuminating spotlight on the transformative potential of MIECs,also involving triple charge conducting oxides(TCOs)in the context of SIMs and advanced fuel cells(FCs).The insights and findings articulated herein contribute substantially to the advancement of SIMs and SIMFCs by tailoring MIECs(TCOs)as promising avenues toward the emergence of high-performance *** scientific quest not only addresses the insistent challenges surrounding efficient charge transfer,ionic transport and power output but also unlocks the profound potential for the widespread commercialization of FC technology.

关键词： MIEC SIM e-i coupling SIMFC TCO Surface and interface Heterostructures

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Assessment of mechanical and Antimicrobial Properties of Die-Cast Al Scrap-Cu Alloy for Contact Surface Application 2

Assessment of Mechanical and Antimicrobial Properties of Die...

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2nd International Conference on Advanced Innovations in Smart Cities, ICAISC 2025

作者： Kolawole, Maruf Yinka Aweda, Jacob Olayiwola Bello, Sefiu Adekunle Oladosu, Kamoru Olufemi Saheed, Zainab Motunrayo Kwara State University Department of Mechanical Engineering Kwara State Malete Nigeria University of University Department of Mechanical Engineering Kwara State Ilorin Nigeria Kwara State University Department of Material Science & Engineering Kwara State Malete Nigeria

ISBN: (纸本)9798331506995

Contact surface bacterial infections are on the increase globally. Metallic silver and copper with excellent antibacterial properties have been reported in the literature but seldom use for structural application due to high cost and relative scarcity. In this work, Al-xwt%Cu alloys with 2.5, 7.5, 5.0, 10.0, 15.0, 20.0, and 25.0 wt% Cu were developed and produced via die-casting technique with mould pre-heating temperature of 300°C. mechanical and antimicrobial properties of the die-cast Al-xCu products were investigated following standard procedure. The results revealed an enhancement in tensile and compressive strength of the alloy with increase in wt% addition of Cu up to 20 wt% and thereafter decline. The peak yield tensile and compressive strength of 200.641 and 373.26 MPa which falls within the recommended value of 110-240 MPa for structural handrail contact surface application was recorded in the sample with 20% wt Cu addition in aluminum thus obtaining a 538 and 80% improvement respectively compared to control sample with 0% Cu. Results of antimicrobial property of the developed Al-xCu alloy antimicrobial property enhancement and the performance is dependent on the specific exposed bacteria strains and weight concentration of Cu. The efficacy of antibacterial assessment of Al-xCu alloy indicated the addition of Cu beyond 20 wt% relative to control sample within each bacteria yielded 238, 141, 95 and 94% antibacterial enhancement on Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella pneumoniae and Escherichia coli respectively. Hence Escherichia coli has more resistance to the antibacterial property of Al-xCu alloy © 2025 IEEE.

关键词： Compressive strength

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Advances in Digital Multi-material Composite Sand-Mold Binder-Jetting Forming Technology and Equipment

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Additive Manufacturing Frontiers 2024年第2期3卷 130-147页

作者： Haoqin Yang Zhongde Shan Dandan Yan Jianpei Shi Haoming Shi Jian Huang College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China

In response to the demand for environmentally friendly and sustainable manufacturing processes for intricate castings used in advanced equipment, binder jetting technology has emerged as a leading method for achieving rapid casting design and manufacturing. This technology has attracted much interest from research institutions, universities, and enterprises worldwide. Binder jetting-based sand-mold additive manufacturing can be used to manufacture complex sand molds (cores) directly and does not require traditional molds, expediting the produc- tion of complex castings and the accompanying process refinement. The exceptional design and manufacturing versatility afforded by this technology has enabled a profound transformation in the foundry industry, advancing the digitization, sustainability, and intelligent evolution of sand casting. This paper explores the recent research progress and achievements in the field of binder jetting sand-mold additive manufacturing in four dimensions: materials, design methods, process technologies, and system equipment. Finally, the characteristics and applica- tion advantages of binder jetting technology are analyzed, and the future development trends and challenges of binder jetting-based sand-mold additive manufacturing technology are investigated.

关键词： Multi-material sand mold Additive manufacturing Binder jetting Sand casting Rapid prototyping

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Hydrophobicity and performance analysis of beverage and agricultural waste torrefaction for high-grade bio-circular solid fuel

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Carbon Resources Conversion 2025年第1期8卷 165-172页

作者： Napat Kaewtrakulchai Sutthipoj Wongrerkdee Benjapon Chalermsinsuwan Namfon Samsalee Chao-Wei Huang Kanit Manatura Kasetsart Agricultural and Agro-industrial Product Improvement Institute(KAPI) Kasetsart UniversityBangkok10220Thailand Department of Physical and Material Sciences Faculty of Liberal Arts and ScienceKasetsart University Kamphaeng Saen CampusNakhon Pathom 73140 Thailand Department of Chemical Technology Faculty of ScienceChulalongkorn UniversityBangkok 10330 Thailand Department of Applied Biology Faculty of Sciences and Liberal ArtsRajamangala University of Technology IsanNakhon Ratchasima30000 Thailand Department of Engineering Science National Cheng Kung UniversityTainan City 701401TaiwanChina Department of Mechanical Engineering Faculty of Engineering at Kamphaeng SaenKasetsart UniversityKamphaeng Saen campusNakhon Pathom73140Thailand

Torrefaction is recognized as a high-performance technology for converting raw biomass into high-grade solid *** this study,hydrophobic and ANOVA analyses were employed to investigate torrefied brewery waste,palm kernel shell,and water hyacinth ***,the torrefaction experiments were conducted at four temperatures(180,230,280,and 330℃)for a residence time of 30 *** biomass type and temperature were crucial in determining the optimum conditions for three response parameters:energy yield(EY),specific energy consumption(SEC),and hygroscopic reduction equilibrium(HRE).Hydrophobicity was assessed by measuring the contact angle(CA),and equilibrium moisture content(EMC)to represent hygroscopic *** ANOVA results indicated that temperature had the most significant impact on the response *** torrefaction of brewery waste at 180℃ yielded an EY of 82.05%,SEC of 81.88 kWh/kg,and HRE of 23.2%.These findings highlight the advantages of biomass-derived torrefaction products in waste utilization,transport,and storage of biomass-derived torrefaction ***,this study demonstrates an efficient method for enhancing the fuel quality of biomass,contributing significantly to the bio-circular green economy concept.

关键词： Torrefaction Hydrophobicity Brewery waste Optimization ANOVA Biochar

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Ab Initio Investigations on the Electronic Properties and Stability of Cu-Substituted Lead Apatite (Lk-99) Family with Different Doping Concentrations (X=0, 1, 2)

SSRN

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SSRN 2023年

作者： Yang, Songge Zhong, Yu Liu, Guangchen Mechanical and Materials Engineering Worcester Polytechnic Institute WorcesterMA01609 United States Department of Material Science and Engineering

The pursuit of room-temperature ambient-pressure superconductivity in novel materials has sparked interest, with recent reports suggesting such properties in Cu-substituted lead apatite, known as LK-99. However, these claims lack comprehensive experimental and theoretical support. In this study, we address this gap by conducting ab initio calculations to explore the impact of varying doping concentrations (x = 0, 1, 2) on the stability and electronic properties of five compounds in the LK-99 family. Our investigations confirm the isolated flat bands that intersect the Fermi level in LK-99 (Pb9Cu(PO4)6O:Cu). In contrast, the other four parent compounds exhibit insulating behavior with wide band gaps. X-ray diffraction spectra based on the DFT simulations at 0K confirm the presence of Cu substitution on Pb(1) sites in the originally synthesized LK-99 sample, while an extra peak suggests potential alternative like Pb8Cu2(PO4)6 phases due to compositional variations in the original LK-99 samples. Furthermore, the LK-99 structure undergoes substantial lattice constriction, resulting in a significant 5.5% reduction in volume and 6.8% in area of two mutually inverted triangles formed by Pb(2) atoms. Meanwhile, energy calculations reveal a marginal energy preference for substituting Cu on Pb(2) sites over Pb(1) sites, with a difference of approximately 0.010 eV per atom (roughly 0.9645 k/mol). Intriguingly, at pressures exceeding 73 GPa, stability shifts towards LK-99 containing Cu substitutions on Pb(1) sites. Despite exhibiting higher electronic conductivity than parent compounds, Pb9Cu(PO4)6O:Cu falls short of the conductivity levels observed in metals or advanced oxide conductors with the simulation based on the Boltzmann transport theory. © 2023, The Authors. All rights reserved.

关键词： Stability

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EXERGETIC ANALYSIS OF A SOLAR ENERGY-BASED HYDROGEN PRODUCTION SYSTEM 23

EXERGETIC ANALYSIS OF A SOLAR ENERGY-BASED HYDROGEN PRODUCTI...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Akci, Hilal Gunerhan, Huseyin Hepbasli, Arif Ege University Graduate School of Natural and Applied Science Mechanical Engineering Program Bornova Izmir35100 Turkey Ege University Faculty of Engineering Department of Mechanical Engineering Bornova Izmir35100 Turkey Yasar University Faculty of Engineering Department of Energy Systems Engineering Bornova Izmir35100 Turkey

ISBN: (纸本)9786250008430

In this study, energy, exergy and sustainability analyses are performed for a solar energy-based hydrogen production system, which is modeled with TRNSYS and engineering Equation Solver (EES) software packages. This system consists of solar photovoltaic panels (PVs), a controller, an electrolyzer, a metal hydride hydrogen tank used for hydrogen production and storage, and Proton Exchange Membrane Fuel Cell (PEMFC) for electricity storage. Dead state temperature is taken as 0 ºC. The results revealed that the PEMFC had the highest energy efficiency of 53.28%. Exergy efficiencies of the solar PV panel, the electrolyzer and the PEMFC were determined to be 9.66%, 60% and 29.39%, respectively. The exergetic sustainability index of the electrolyzer had the maximum value of 2.501. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Hydrogen production

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Recent advances in carbon-supported non-precious metal singleatom catalysts for energy conversion electrocatalysis

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National science Open 2023年第2期2卷 115-160页

作者： Li-Xia Liu Yangyang Ding Linan Zhu Jin-Cheng Li Huitong Du Xiang Li Zhaoyuan Lyu Dan Du Fuqiang Liu Yuanyuan Wang Wenlei Zhu Yuehe Lin State Key Laboratory of Pollution Control and Resource Reuse State Key Laboratory of Analytical Chemistry for Life Sciencethe Frontiers Science Center for Critical Earth Material CyclingSchool of the EnvironmentSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Mechanical and Materials Engineering Washington State UniversityPullman WA 99164USA Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus MaterialsKunming University of Science and TechnologyKunming 650500China

Non-precious metal single-atom catalysts(NPM-SACs)with unique electronic structures and coordination environments have gained much attention in electrocatalysis owing to their low cost,high atomic utilization,and high ***-SACs on carbon support(NPM-SACs/CS)are promising because of the carbon substrate with a large surface area,excellent electrical conductivity,and high chemical *** review provides an overview of recent developments in NPM-SACs/CS for the electrocatalytic ***,the state-of-the-art synthesis methods and advanced characterization techniques of NPM-SACs/CS are discussed in ***,the structural adjustment strategy of NPM-SACs/CS for optimizing electrocatalytic performance is introduced ***,we provide a comprehensive summary of recent advances in developing NPM-SACs/CS for important electrochemical reactions,including carbon dioxide reduction reaction,hydrogen evolution reaction,oxygen evolution reaction,oxygen reduction reaction,and nitrogen reduction *** the end,the existing challenges and future opportunities of NPM-SACs/CS in the electrocatalytic field are highlighted.

关键词： single-atom catalysts non-precious metal electrocatalytic reaction carbon-supported

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