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Oscillatory Hall effect from magnetoelectronic coupling in flexoelectronic silicon

Physical Review B 2024年第8期109卷 L081113-L081113页

作者： Paul C. Lou Ravindra G. Bhardwaj Anand Katailiha W. P. Beyermann Sandeep Kumar Department of Mechanical Engineering University of California Riverside California 92521 USA Department of Physics and Astronomy University of California Riverside California 92521 USA Materials Science and Engineering Program University of California Riverside California 92521 USA

Magnetoelectronic coupling can be defined as cross-domain coupling between electronic and magnetic properties, where modulation in magnetic properties changes the electronic properties. In this Letter, explicit experimental evidence of magnetoelectronic coupling is presented, which is uncovered from the oscillatory Hall effect response in Hall measurement. The strain gradient in a MgO (1.8 nm)/p-Si (∼400 nm) freestanding sample leads to transfer of electrons (∼5×1018cm−3) from valence to conduction band due to flexoelectronic charge separation in the p-Si layer. The resulting flexoelectronic polarization gives rise to the temporal magnetic moment from dynamical multiferroicity. The external magnetic field changes the net temporal magnetic moment, which causes modulations in charge carrier concentration and oscillatory Hall effect. The period of oscillatory Hall response is 1.12 T, which is attributed to the magnitude of the temporal magnetic moment. The discovery of the oscillatory Hall effect adds another member to the family of Hall effects.

关键词： Hall effect Doped semiconductors Electronically polarized systems Flexoelectrics Multiferroics Hall bar

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High-strength and thermally stable TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy fabricated via selective laser melting

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International Journal of Minerals,Metallurgy and materials 2024年第10期31卷 2221-2232页

作者： Jiang Yu Yaoxiang Geng Yongkang Chen Xiao Wang Zhijie Zhang Hao Tang Junhua Xu Hongbo Ju Dongpeng Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China CEMMPRE-Centre for Mechanical Engineering Materials and Processes Department of Mechanical EngineeringUniversity of CoimbraRua Luís Reis SantosCoimbra 3030-788Portugal

To increase the processability and plasticity of the selective laser melting(SLM)fabricated Al-Mn-Mg-Er-Zr alloys,a novel TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy with a mixture of Al-Mn-Mg-Er-Zr and nano-TiB_(2) powders was fabricated by *** pro-cessability,microstructure,and mechanical properties of the alloy were systematically investigated by density measurement,microstruc-ture characterization,and mechanical properties *** alloys fabricated at 250 W displayed higher relative densities due to a uni-formly smooth top surface and appropriate laser energy *** maximum relative density value of the alloy reached(99.7±0.1)%,demonstrating good *** alloy exhibited a duplex grain microstructure consisting of columnar regions primarily and equiaxed regions with TiB_(2),Al6Mn,and Al3Er phases distributed along the grain *** directly aging treatment at a high tem-perature of 400℃,the strength of the SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy increased due to the precipitation of the secondary Al6Mn *** maximum yield strength and ultimate tensile strength of the aging alloy were measured to be(374±1)and(512±13)MPa,*** SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy demonstrates exceptional strength and thermal stability due to the synergistic effects of the inhibition of grain growth,the incorporation of TiB_(2) nanoparticles,and the precipitation of secondary Al6Mn nanoparticles.

关键词： selective laser melting aluminum alloy processability mechanical properties thermal stability

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Recent advances using equal-channel angular pressing to improve the properties of biodegradable Mg-Zn alloys

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Journal of Magnesium and Alloys 2023年第7期11卷 2260-2284页

作者： Mohammad Hashemi Reza Alizadeh Terence G.Langdon Department of Materials Science and Engineering Sharif University of TechnologyTehranIran Materials Research Group Department of Mechanical EngineeringUniversity of SouthamptonSouthampton SO171BJUnited Kingdom

Magnesium alloys are of considerable current interest for use as degradable implants due to their unique properties including biodegrad-ability,biocompatibility,low density and adequate mechanical ***,there is a need to further improve these properties either by alloying or through the use of appropriate *** the different biodegradable Mg alloys now in use,the Mg-Zn series are of special interest and have been the subject of many research *** is primarily because Zn is an essential element for the human body in addition to its positive effects in improving the mechanical strength and lowering the degradation rate of the *** properties of Mg-Zn alloys may be further improved both through the addition of third and fourth alloying elements such as Ca,Ag,Sn or Sr and/or by thermo-mechanical processing where the latter is more environmentally and economically *** practice,procedures based on the application of severe plastic deformation(SPD)are especially suited to produce fine-grained microstructures with improved mechanical,degradation and cell ***-channel angular pressing(ECAP)is a popular SPD technique that has the capability of pro-ducing bulk materials that are sufficiently large for use as typical ***,this review is designed to provide a comprehensive summary of the research that has been undertaken on ECAP-processed biodegradable Mg-Zn alloys.

关键词： Bio-degradation ECAP Fine-grained microstructure Mg–Zn alloys Severe plastic deformation

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Multi-objective optimization of micro crystalline cellulose and montmorillonite filled poly lactic acid bio–composite and its characterizations

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Journal of engineering and Applied science 2024年第1期71卷 1-20页

作者： Zeleke, Nehemiah Mengistu Sinha, Devendra Kumar Kumar, Santosh Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering Adama Science and Technology University Adama Ethiopia Center of Excellence Advanced Manufacturing Engineering Adama Science and Technology University Adama Ethiopia Varanasi India

In this research study, the synthesis of poly lactic acid (PLA) based bio composite material factors contributions were investigated through the Taguchi-based grey relational analysis (GRA) technique. Effects of micro crystalline cellulose (MCC) and montmorillonite (MTT) nano clay filler, sorbitol (S) plasticizer, and temperature (T) operating factor on the PLA matrix through melt-mixing preparation method. The tensile strength (TS), Young modulus (YM), flexural strength (FS), flexural modulus (FM), hardness, impact strength (IS), water absorption (WA), and density properties of bio composite material were investigated for each experimental setup (orthogonal array, L16). Additionally, neat PLA and optimal sample structural, thermal, and morphological properties were examined through Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (X-RD), thermal gravimetry analysis/differential thermal gravimetry (TGA/DTG), and DSC and SEM analyses. The obtained result for optimal mechanical and physical properties of MCC/MTT/S/PLA bio composite was MCC at level 3 (6%), MTT at level 4 (9%), S at level 2 (10%), and T at level 4 (175 °C). Analysis of variance (ANOVA) shows that MTT has the greatest significant effect on mechanical and physical properties of MCC/MTT/S/PLA bio composite followed by MCC, T, and S. The confirmation test indicates that the improvement of weighted grey relational grade (GRG) from 0.7896 to 0.846 and the FTIR, XRD, thermal gravimetry/differential scanning calorimetry (TG/DSC), and scanning electron microscopy (SEM) results indicates that the good interaction between PLA and fillers, improvement of thermal and morphological properties of optimal (6MCC/9MTT/10S/175 °C) bio composite samples. Therefore, the multi-response characteristics of MCC/MTT/S/PLA bio composite can be highly improved by this technique. © The Author(s) 2024.

关键词： Fourier transform infrared spectroscopy

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Chemical Compounds from GC/MS Analysis, Functional Investigations, and Corrosion Inhibition Efficacy of a Bio-based and Sustainable Extract against HCl Solution-Activated Corrosion

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Journal of Bio- and Tribo-Corrosion 2025年第2期11卷 1-20页

作者： Ofuyekpone, Okiemute Dickson Okuma, Silas Oseme Iweriolor, Sunday Utu, Ochuko Goodluck Department of Materials and Metallurgical Engineering Faculty of Engineering Delta State University of Science and Technology Ozoro Nigeria Department of Mechanical Engineering Faculty of Engineering Nigeria Maritime University Okerenkoko Nigeria Department of Mechanical Engineering Faculty of Engineering University of Delta Agbor Nigeria Department of Welding and Fabrication Engineering Delta State Polytechnic Ogwashi-Uku Nigeria

Chemicalcompounds from Gas Chromatography/Mass Spectroscopy and functional experimentations of pulverized egg shell extract (PESE) with acetone as solvent showed the presence of polar and non-polar compounds. Among the found organic compounds, some were found to be green and raw materials for medical companies and the polymer industry. Corrosion inhibition investigation was carried out using gravimetric, thermometric, and potentiodynamic polarization approaches, and morphological characterization. Results obtained demonstrated that the extract significantly reduced the half-life of steel, indicating that the oxidation of mild steel in HCl solutions was mitigated due to the adsorption of active chemical components from the extract onto the adsorbent surface. This suggests that the active ingredients in the extract were instrumental in safeguarding and prolonging the lifespan of the steel samples against corrosion-triggering chloride anion. Findings from gravimetric, thermometric, and potentiodynamic polarization approaches are in alignment and indicate that the extract's effectiveness is dependent on concentration and time. The extract efficiency was noticed to increase with concentration until the solution reached saturation point, and decreased with prolonged immersion time. The observed FTIR peaks and morphological display also corroborate the reported inhibitory prowess of the extract. Potentiodynamic polarization parameters revealed that the extract acted with a mixed mechanism. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Gas chromatography

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The Significance of the Critical Stress Ratio in the Formulation of Nonlinear Constant Life Diagrams for CFRP Laminate Life Prediction

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Journal of The Institution of Engineers (India): Series E 2024年第2期105卷 119-128页

作者： Behera, Alok Kale, Sandeep Thawre, Manjusha M. Ballal, Atul Department of Mechanical Engineering Indian Institute of Science Karnataka Bangalore India Department of Metallurgical and Materials Engineering Visvesvaraya National Institute of Technology Nagpur India

The constant life diagram (CLD), a trusted method for life prediction, is generated based on static strength and constant amplitude fatigue data. This study examines the predictive accuracy of various nonlinear CLDs, including the innovative Anisomorphic CLDs, for a [+ 45,− 45]3S carbon fiber reinforced polymer composite laminate fabricated via autoclave curing with a 59% fiber volume. Initial calculations encompassed ultimate tensile strength (UTS) and ultimate compressive strength (UCS) using a constant crosshead speed of 1 mm/min. Subsequently, constant amplitude fatigue experiments were conducted for five stress ratios, encompassing the critical stress ratio (CSR) (χ = UCS/UTS), R = 0.1 and 0.5 (tension–tension), − 1 (tension–compression), and 5 (compression-compression). The predictive accuracy of three top-performing nonlinear CLDs, i.e., asymmetric Gerber, inclined Goodman, and the innovative Anisomorphic CLD, was assessed through necessary stress-life (S–N) curves. Notably, the novel Anisomorphic CLD, utilizing only static and CSR fatigue data, demonstrated optimal accuracy, positioning the maximum amplitude stress for any random fatigue life (Nf) on CSR. Its practical implementation undoubtedly streamlines the process, saving time, money, and effort required for extensive fatigue data generation. © The Institution of Engineers (India) 2024.

关键词： Fatigue of materials

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Repulsion, Acceleration, and Coalescence between Water Droplets on Superhydrophobic Glass by Triboelectrification

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Langmuir 2024年第25期40卷 13219-13226页

作者： Chen, Kuan Ting Wu, Yu Ping Huang, Yu Fang Hsu, Chin Chi Shieh, Jiann Department of Materials Science and Engineering National United University Miaoli36063 Taiwan Department of Mechanical Engineering National United University Miaoli36063 Taiwan

Manipulating the motion of water droplets on surfaces, which is crucial for various applications, such as microfluidics and heat transfer, presents considerable challenges, primarily due to the significant influence of capillary forces. This effect becomes more pronounced when droplets are in close proximity, often resulting in undesired coalescence. Triboelectrification, which involves charging pure water droplets, is a promising approach to enhance the ability to manipulate water droplets. For effective triboelectrification, charges must accumulate within the droplets;this ensures efficient and sustained droplet manipulation while minimizing dissipation. Low-friction, superhydrophobic, insulating surfaces are ideal for this purpose. However, few studies have explored the application of insulating superhydrophobic surfaces to manipulate droplet motion. In this study, we investigated the behavior of water droplets on insulating superhydrophobic quartz surfaces after triboelectrification. The droplets acquired significant charge when dripped onto a superhydrophobic glass surface. Consequently, these charged droplets exhibited behaviors such as repulsion and acceleration from one another, uphill movement, and rapid long-distance transport to specific positions. These advancements in droplet manipulation techniques hold promise for diverse fields such as microfluidics and heat exchangers. © 2024 American Chemical Society.

关键词： Microfluidics

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Targeted regeneration and upcycling of spent graphite by defect‐driven tin nucleation

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Carbon Energy 2024年第4期6卷 91-103页

作者： Zhiheng Cheng Zhiling Luo Hao Zhang Wuxing Zhang Wang Gao Yang Zhang Long Qie Yonggang Yao Yunhui Huang Kun Kelvin Fu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationDepartment of Materials Science and EngineeringJilin UniversityChangchunChina Electronic Materials Research Laboratory(Key Lab of Education Ministry) School of Electronic and Information Engineeringand Instrumental Analysis CenterXi'an Jiaotong UniversityXi'anChina Department of Mechanical Engineering University of DelawareNewarkUSA

The recycling of spent batteries has become increasingly important owing to their wide applications,abundant raw material supply,and sustainable *** with the degraded cathode,spent anode graphite often has a relatively intact structure with few defects after long ***,most spent graphite is simply burned or discarded due to its limited value and inferior performance on using conventional recycling methods that are complex,have low efficiency,and fail in performance ***,we propose a fast,efficient,and“intelligent”strategy to regenerate and upcycle spent graphite based on defect‐driven targeted *** Sn as a nanoscale healant,we used rapid heating(~50 ms)to enable dynamic Sn droplets to automatically nucleate around the surface defects on the graphite upon cooling owing to strong binding to the defects(~5.84 eV/atom),thus simultaneously achieving Sn dispersion and graphite *** a result,the regenerated graphite showed enhanced capacity and cycle stability(458.9 mAh g^(−1) at 0.2 A g^(−1) after 100 cycles),superior to those of commercial *** from the self‐adaption of Sn dispersion,spent graphite with different degrees of defects can be regenerated to similar structures and *** analysis indicates that targeted regeneration and upcycling have significantly lower energy consumption(~99%reduction)and near‐zero CO_(2) emission,and yield much higher profit than hydrometallurgy,which opens a new avenue for direct upcycling of spend graphite in an efficient,green,and profitable manner for sustainable battery manufacture.

关键词： battery recycling spent graphite targeted regeneration upcycling graphite

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Hybrid electrodes effective for both electrowetting-and dielectrowetting-driven digital microfluidics

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Droplet 2023年第3期2卷 60-67页

作者： Hongyao Geng Sung Kwon Cho Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPennsylvaniaUSA

Electrowetting on dielectric(EWOD)and dielectrowetting(DEW)are two major principles to drive droplets in digital *** is effective to manipulate(create,transport,split,and merge)conductive droplets being currently used for many biological,chemical,and optical *** can also manipulate droplets but more efficiently with dielectric(nonconductive)fluids.A digital microfluidic platform efficiently operable by both EWOD and DEW would offer higher versatility in handling a wide range of fluids,regardless of their *** this regard,this article presents a new hybrid electrode design enabling EWOD and DEW to drive various kinds of droplet fluids on a single *** addition,a slippery liquid-infused surface(SLIPS)is integrated with the hybrid *** SLIPS is well known to resist biofouling and repel sticky fluids,which endows the hybrid electrodes with much wider application *** a result,the present SLIPS-integrated hybrid electrodes facilitate actuating various kinds of fluids which would not be driven by conventional EWOD and/or DEW *** paper presents the successful transportation of not only conductive fluids including water,protein solution,glycerol,and honey but also nonconductive fluids including dodecane,silicone oil,and light and heavy crude oil,all driven by the SLIPS-integrated hybrid *** performance comparisons among solid,interdigitating,and hybrid electrodes are made by testing both conductive and nonconductive droplets.

关键词： dielectric fluid fouling

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Integrated modeling to control vaporization-induced composition change during additive manufacturing of nickelbased superalloys

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npj Computational materials 2024年第1期10卷 788-798页

作者： Tuhin Mukherjee Junji Shinjo Tarasankar DebRoy Chinnapat Panwisawas Department of Mechanical Engineering Iowa State UniversityAmesIAUSA Next Generation Tatara Co-Creation Centre Shimane UniversityMatsueJapan Department of Materials Science and Engineering Pennsylvania State UniversityUniversity ParkPAUSA School of Engineering and Materials Science Queen Mary University of LondonLondonUK

Acritical issue in laserpowder bed fusion(LPBF)additivemanufacturing is the selective vaporization of alloying elements resulting in poor mechanical properties and corrosion resistance of *** process also alters the part’s chemical composition compared to the *** we present a novel multi-physics modeling framework,integrating heat and fluid flow simulations,thermodynamic calculations,and evaporation modeling to estimate and control the composition change during LPBF of nickel-based *** validation confirms the accuracy of our ***,we quantify the relative vulnerabilities of different nickel-based superalloys to composition change quantitatively and we examine the effect of remelting due to the layer-by-layer deposition during the LPBF *** variations in evaporative flux and compositions for each element were determined,providing valuable insights into the LPBF process and product *** results of this study can be used to optimize theLPBF process parameters such as laserpower,scanning speed,and powder layer thickness to ensure the production of high-quality components with desired chemical compositions.

关键词： corrosion alloying additive

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