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SSRN 2024年

作者： Kim, Hyojung Moon, Cheon Woo Choi, Min-Ju Suh, Jun Min Shim, Young-Seok Yang, Seok Joo Kim, Soo Young Jang, Ho Won Cai, Zhicheng Lee, Mi Gyoung Department of Semiconductor Systems engineering Sejong University Seoul05006 Korea Republic of Department of Materials Science and Engineering Seoul National University Seoul08826 Korea Republic of Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge United States School of Energy Materials and Chemical Engineering Korea University of Technology and Education Cheonan Korea Republic of Davidson School of Chemical Engineering Purdue University West LafayetteIN47907 United States Department of Materials Science and Engineering Incheon National University Incheon22012 Korea Republic of Department of Display Materials Engineering Soonchunhyang University Asan31538 Korea Republic of Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of

In this study, we propose the (PEA)2MA3Pb4I13, a quasi-two-dimensional (2D) halide perovskite, in the realm of resistive switching memory devices. A quasi-2D perovskite film, (PEA)2MA3Pb4I13, with a thickness measuring 450 nm, has been effectively fabricated on a silicon substrate coated with platinum through an all-solution process conducted at low temperatures. The constructed resistive switching memory devices, incorporating an Ag/(PEA)2MA3Pb4I13/Pt/Ti/SiO2/Si configuration, display dependable and consistent bipolar switching attributes. The device showed an ultra-low operating voltage of less than +0.1 V, an impressive high ON/OFF ratio exceeding 108, reversible resistive switching via pulse voltage operation, and the capability for multilevel data storage. Furthermore, we fabricated resistive switching of (PEA)2MA3Pb4I13 thin films at the 4-inch wafer. The switching characteristics observed throughout the 4-inch wafer closely resembled those seen in smaller-scale devices. This set of findings robustly supports the premise that (PEA)2MA3Pb4I13 is adeptly compatible with non-volatile memory applications. Conclusively, this research paves the way in elucidating the attributes of quasi-2D halide perovskites pertinent to high ON/OFF ratios and low-voltage resistive switching. Moreover, it casts a spotlight on their immense potential in the development of low-energy-consuming nonvolatile memory devices that can be integrated into future computing systems. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Barriers to Additive Manufacturing Implementation in Plastic Waste Management - A Case Study from a Developing Economy

Barriers to Additive Manufacturing Implementation in Plastic...

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2022 IEEE International Conference on Industrial engineering and engineering Management, IEEM 2022

作者： Aruchunarasa, Banusha Fernando, W. Madushan Perera, H. Niles Thibbotuwawa, Amila Chandima Ratnayake, R.M. University of Moratuwa Center for Supply Chain Operations and Logistics Optimization Sri Lanka University of Stavanger Department of Mechanical and Structural Engineering and Materials Science Norway University of Jaffna Faculty of Engineering Department of Interdisciplinary Studies Ariviyal Nagar Sri Lanka

ISBN: (数字)9781665486873

ISBN: (纸本)9781665486873

The advances in additive manufacturing (AM) help the recycling, redesign, and reuse of waste plastics, enabling circular economy supply chains and business ecosystems. Distributed Recycling through Additive Manufacturing (DRAM) is a technique for recycling waste plastics using mechanical processes for AM. Even though these integrated concepts enable a new path to recycle waste plastics, there are numerous barriers to their implementation, especially in developing economies. The ten barriers to implementing DRAM for waste plastic recycling were finalized through the use of a literature review and the Delphi technique. To determine the contextual relationship between the barriers, the Interpretative Structural Modeling (ISM) technique was used. A case study was carried out to investigate the barriers to implementing AM in plastic waste management in a developing economy. The interrelationship among barriers was investigated and barrier prioritization was performed. The findings from the case study reveal that the lack of flexibility to implement circular economy (CE) goals is one of the main barriers to implementing AM in plastic waste management. Findings from this study provide insights for industry practitioners and policymakers in developing a strategy to implement AM in plastic waste management. © 2022 IEEE.

关键词： 3D printers

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The size-dependent elastohydrodynamic lubrication contact of a coated half-plane with non-Newtonian fluid

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Applied Mathematics and Mechanics(English Edition) 2021年第7期42卷 915-930页

作者： Jie SU Hongxia SONG Liaoliang KE S.M.AIZIKOVICH School of Mechanical Engineering Tianjin UniversityTianjin 300350China School of Mathematical Science Inner Mongolia UniversityHohhot 010021China Laboratory of Functionally Graded and Composite Materials Research and Education Center"Materials"Don State Technical UniversityRostov-on-Don 344000Russia

Based on the couple-stress theory,the elastohydrodynamic lubrication(EHL)contact is analyzed with a consideration of the size *** lubricant between the contact surface of a homogeneous coated half-plane and a rigid punch is supposed to be the non-Newtonian *** density and viscosity of the lubricant are dependent on fluid *** of film thickness,in-plane stress,and fluid pressure are calculated by solving the nonlinear fluid-solid coupled equations with an iterative *** effects of the punch radius,size parameter,coating thickness,slide/roll ratio,entraining velocity,resultant normal load,and stiffness ratio on lubricant film thickness,in-plane stress,and fluid pressure are *** results demonstrate that fluid pressure and film thickness are obviously dependent on the size parameter,stiffness ratio,and coating thickness.

关键词： elastohydrodynamic lubrication(EHL) non-Newtonian fluid size effect couple-stress theory coating

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Exploring lattice rotation and distortion on Kikuchi patterns during Nanoindentation: MD simulation approach

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materials Characterization 2025年 225卷

作者： Chen, Wei-Chieh Kuo, Cheng-Zhang Chang, I-Ling Tung, Shih-Heng Kuo, Jui-Chao Department of Materials Science and Engineering National Cheng-Kung University Tainan701 Taiwan Department of Mechanical Engineering National Cheng-Kung University Tainan701 Taiwan Department of Civil and Environmental Engineering National University of Kaohsiung Kaohsiung811 Taiwan

The novelty of the present study lies in clarifying the effects of lattice rotation and distortion on Kikuchi patterns during nanoindentation using molecular dynamics (MD) simulations. The MD simulations revealed the changes in the orientations and lattice parameters, which are reflected in the Kikuchi patterns. Then, high-resolution electron backscatter diffraction was used to calculate the strain and misorientation using the simulated Kikuchi patterns. Our study is the first to investigate the changes in lattice rotation and distortion induced by dislocations. Subsequently, the effects of lattice rotation and distortion on the changes in the Kikuchi pattern were studied. The results indicated that the influence of atomic rotation induced by dislocations extends within a radius of approximately 20 Å. In addition, we demonstrated that changes in the lattice rotation and distortion affected the zone axes of the Kikuchi patterns during nanoindentation. © 2025

关键词： Distortion (waves)

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Elastomers Fail from the Edge

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Physical Review X 2024年第1期14卷 011054-011054页

作者： Nan Xue Rong Long Eric R. Dufresne Robert W. Style Department of Materials ETH Zürich 8093 Zürich Switzerland Department of Materials Science and Engineering Cornell University Ithaca New York 14853 USA Laboratory of Atomic and Solid-State Physics Cornell University Ithaca New York 14853 USA Department of Mechanical Engineering University of Colorado Boulder Boulder Colorado 80309 USA

The performance of soft devices is limited by the fracture resistance of elastomers. Thus, understanding how fracture resistance changes with material and sample geometry is an important challenge. A key observation is that thicker elastomers can be significantly tougher than thinner ones. We show that this surprising toughness enhancement in thick samples emerges from the 3D geometry of the fracture process. In contrast to the classical picture of a 2D crack, failure is driven by the growth of two separate “edge” cracks that nucleate early on at a sample’s sides. As loading is increased, these cracks propagate in towards the sample midplane. When they merge, samples reach their ultimate failure strength. In thicker samples, edge cracks need to propagate farther before meeting, resulting in increased sample toughness. We demonstrate that edge-crack growth is controlled by the elastomer’s strain-stiffening properties. Our results have direct implications for how to effectively toughen elastomers by controlling their geometry and large-strain mechanical properties.

关键词： Elastic forces Fracture mechanical deformation Elastomers

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Stabilizing High-Nickel Cathodes via Interfacial Hydrogen Bonding Effects Using a Hydrofluoric Acid-Scavenging Separator

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engineering 2024年第8期39卷 117-126页

作者： Shijie Zhong Liwei Dong Botao Yuan Yueyao Dong Qun Li Yuanpeng Ji Yuanpeng Liu Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments &Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Nickel-rich layered Li transition metal oxides are the most promising cathode materials for high-energydensity Li-ion ***,they exhibit rapid capacity degradation induced by transition metal dissolution and structural reconstruction,which are associated with hydrofluoric acid(HF)generation from lithium hexafluorophosphate *** potential for thermal runaway during the working process poses another *** are promising components to alleviate the aforementioned ***,an ultrathin double-layered separator with a 10 lm polyimide(PI)basement and a 2 lm polyvinylidene difluoride(PVDF)coating layer is designed and fabricated by combining a nonsolvent induced phase inversion process and coating *** PI skeleton provides good stability against potential thermal shrinkage,and the strong PI-PVDF bonding endows the composite separator with robust structural integrity;these characteristics jointly contribute to the extraordinary mechanical tolerance of the separator at elevated ***,unique HF-scavenging effects are achieved with the formation of-CO…H-F hydrogen bonds for the abundant HF coordination sites provided by the imide ring;hence,the layered Ni-rich cathodes are protected from HF attack,which ultimately reduces transition metal dissolution and facilitates long-term cyclability of the Ni-rich ***||NCM811 batteries(where“NCM”indicates LiNi_(x)Co_(y)Mn_(1-x-y)O_(2))with the proposed composite separator exhibit a 90.6%capacity retention after 400 cycles at room temperature and remain sustainable at 60℃with a 91.4%capacity retention after 200 *** adopting a new perspective on separators,this study presents a feasible and promising strategy for suppressing capacity degradation and enabling the safe operation of Ni-rich cathode materials.

关键词： Nickel-rich cathodes Composite separator HF scavenging Transition metal dissolution Long-term cyclability

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Development of High Temperature Lead-free Solders in the Al-95Zn + xSn Systems

Development of High Temperature Lead-free Solders in the Al-...

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International Conference on Electronics Packaging (ICEP)

作者： Andromeda Dwi Laksono Yee-Wen Yen Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan R.O.C Study Program of Materials and Metallurgical Engineering Institut Teknologi Kalimantan Balikpapan East Kalimantan Indonesia

The high-temperature lead-free solder alloys of Al-95Zn with the modification of the addition of Sn have been investigated. Its proportion is used to adjust the metallographic microstructure, solidified precipitate phase, and liquidus temperature of the solder alloy. The characterization results, such as scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and differential scanning calorimeter (DSC), will be discussed in this study. The study results show that the Al-Sn-Zn-based alloy has (Zn)+β- Sn+(Al) precipitates when heat-treated at 900°C for 36 h. Its liquidus temperature of Al-95Zn + xSn is between 342-385°C, and increased Sn content will decrease its liquidus temperature.

关键词： Heating systems Scanning electron microscopy X-ray scattering Lead X-ray diffraction Microstructure Dispersion

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Influence of Groove Orientation on Transmission Characteristics of Hydro-viscous Clutch Considering Oil Film Cavitation

Influence of Groove Orientation on Transmission Characterist...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Fangwei Xie Chunjie Xu Xudong Zheng Jinjie Ji Ramesh K. Agarwal Xiumei Liu School of Mechatronic Engineering China University of Mining and Technology Xuzhou China School of Mechanical Engineering Jiangsu University Zhenjiang China Department of Mechanical Engineering and Materials Science Washington University in St. Louis Missouri USA

ISBN: (数字)9798350304947

ISBN: (纸本)9798350304954

In order to investigate the influence of oil film cavitation on the transmission characteristics, a single oil film of the hydro-viscous clutch was taken as the research object. Considering the groove orientation, the mathematical model and phase transient model of the oil film were established. Based on the Reynolds equation of viscous flow, the oil film flow field is solved. Both numerical analysis and simulated results show that the oil film cavitation will occur first in the upstream position of the groove area at the outer radius of the oil film, and the cavitation bubbles will diffuse into the innerradius area of the groove and the non-groove area with the increase of the rotational speed, which is consistent with the cavitation morphology captured in the experiment. Considering that the cavitation in the groove with a negative inclination angle is more severe than that in the groove with a positive inclination angle, the influence of groove orientation on oil film transmission characteristics was analyzed experimentally. Results show that the cavitation bubbles in a negatively inclined groove are more likely to destroy the integrity of the oil film when the rotational speed is greater than 600 r/min, resulting in a decrease in the oil film bearing capacity and transmission torque. Therefore, the friction pair with positively inclined grooves will have better transmission performance.

关键词： Photography Torque Oils Friction Velocity control Morphology Mathematical models

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Microstructure, mechanical properties, and wear behaviors of CrSiN films on oxynitriding-treated Vanadis 60 high-speed steel by the direct current magnetron sputtering process

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Thin Solid Films 2024年 801卷

作者： Huang, Kuo-Tsung Chang, Shih-Hsien Huang, Han-Fu Chen, Chien-Wei Yang, Chih-Hao Department of Auto-Mechanics National Kangshan Agricultural Industrial Senior High School Kaohsiung82049 Taiwan Department of Materials and Mineral Resources Engineering National Taipei University of Technology Taipei10608 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei10608 Taiwan Department of Mechanical Engineering National Pingtung University of Science and Technology Pingtung 91201 Taiwan China

This study utilized the direct current magnetron sputtering technique within the physical vapor deposition process to apply a chrome silicon nitride (CrSiN) coating onto the oxynitrided surface of Vanadis 60 high-speed steel. The experimental parameters include various deposition bias voltages (0, -25, -50, -75, and -100 V), a gas flow rate of 45/30 (Ar/N2) sccm, a power of 100 W, a voltage of 400 V, a deposition time of 2.5 h, and a deposition temperature of 225 °C. The research results show that the substrate formed an oxynitriding layer with a thickness of about 30 μm, while the surface hardness increased to about 1300 HV0.05. When the coatings were deposited at a bias voltage of -100 V, the CrSiN coatings possessed the highest hardness (5.74 GPa) and elastic modulus (110.94 GPa), thus, it had the best wear resistance (specific wear rate was 1.19×10−5, and 7.29×10−5 mm3·m−1·N−1 under the loads of 1.5 N and 3 N), and good corrosion resistance (corrosion current was 3.28×10−5 A·cm−2, and polarization resistance was 793.18 Ω·cm2 in a 0.1 N H2SO4 solution). Furthermore, transmission electron microscopy observations confirm that the CrSiN coatings had a significant amorphous structure. © 2024 Elsevier B.V.

关键词： Wear of materials

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Dense Hydrogen-Bonding Network Boosts Ionic Conductive Hydrogels with Extremely High Toughness,Rapid Self-Recovery,and Autonomous Adhesion for Human-Motion Detection

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Research 2021年第1期2021卷 713-726页

作者： Bing Zhang Xu Zhang Kening Wan Jixin Zhu Jingsan Xu Chao Zhang Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInnovation Center for Textile Science and TechnologyDonghua UniversityShanghai 201620China School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E14NSUK Shaanxi Institute of Flexible Electronics(SIFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an 710072China School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China

The construction of ionic conductive hydrogels with high transparency,excellent mechanical robustness,high toughness,and rapid self-recovery is highly desired yet ***,a hydrogen-bonding network densification strategy is presented for preparing a highly stretchable and transparent poly(ionic liquid)hydrogel(PAM-r-MVIC)from the perspective of random copolymerization of 1-methyl-3-(4-vinylbenzyl)imidazolium chloride and acrylamide in *** to the formation of a dense hydrogen-bonding network,the resultant PAM-r-MVIC exhibited an intrinsically high stretchability(>1000%)and compressibility(90%),fast self-recovery with high toughness(2950 kJ m^(-3)),and excellent fatigue resistance with no deviation for 100 *** particle dynamics simulations revealed that the orientation of hydrogen bonds along the stretching direction boosted mechanical strength and toughness,which were further proved by the restriction of molecular chain movements ascribing to the formation of a dense hydrogen-bonding network from mean square displacement *** with high ionic conductivity over a wide temperature range and autonomous adhesion on various surfaces with tailored adhesive strength,the PAM-r-MVIC can readily work as a highly stretchable and healable ionic conductor for a capacitive/resistive bimodal sensor with self-adhesion,high sensitivity,excellent linearity,and great *** study might provide a new path of designing and fabricating ionic conductive hydrogels with high mechanical elasticity,high toughness,and excellent fatigue resilience for skin-inspired ionic sensors in detecting complex human motions.

关键词： toughness fatigue bonding

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