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Green materials and Electronic Packaging Interconnect Technology Symposium, EPITS 2022

作者： Rosmamuhamadani, R. Razali, N.F.M. Basir, N.N.A. Osman, S. Mahat, M.M. Yahaya, S.M. Zakaria, M.N. Material Science and Technology Program Faculty of Applied Sciences Universiti Teknologi MARA Selangor Shah Alam40450 Malaysia Applied Chemistry Program Faculty of Applied Sciences Universiti Teknologi MARA Selangor Shah Alam40450 Malaysia Eco-Technology Program Faculty of Applied Sciences Universiti Teknologi MARA Shah Alam40450 Malaysia Selangor School of Materials and Mineral Resources Engineering Universiti Sains Malaysia Penang Nibong Tebal14300 Malaysia

ISBN: (纸本)9789811992667

Aluminum metal matrix composites (MMC) are potential materials for many applications due to their outstanding physical and mechanical properties. Reinforcements in the metallic matrix enhance the qualities of stiffness, specific strength, wear, creep, and fatigue when compared to conventional engineering materials. The discussion covered the corrosion behavior of strontium (Sr) reinforced with aluminum–magnesium and aluminum–copper. Utilizing electrochemical studies such electrochemical impedance spectra, linear polarization tests, open-circuit potential, and potentiodynamic tests, the corrosion resistance of the Al-MMC composites created in this study was examined. The linear polarization resistance (LPR) method of the Gamry Reference Potentiostat is used to evaluate the rate of corrosion of different Al-MMCs. Sr is frequently utilized in the casting industry to modify hypoeutectic aluminum–silicon (Al–Si) alloys’ eutectic silicon. Sr has been found to increase the amount and severity of casting faults, particularly porosity and oxide inclusions, according to the reviews that have been done. This study made an effort to assess the effects of the reinforcing material Sr used in the synthesis of Al-MMC on the materials’ corrosion behavior. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Metallic matrix composites

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Effects of femtosecond laser micropatterning on the surface properties and cellular response of biomedical tantalum-blended composites

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Journal of Central South University 2022年第10期29卷 3376-3384页

作者： LUO Fang-fang LIU Peng QIU Tie-cheng ZHAI Yong-ping WANG Xian-wei GUO Ting LIU Jia-bin WANG Zu-yong School of Science Huzhou UniversityHuzhou 313000China College of Materials Science and Engineering Hunan UniversityChangsha 410082China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Department of Vascular Surgery Xiangya HospitalCentral South UniversityChangsha 410008China

Poly(ε-caprolactone)(PCL)holds unique bioresorbability and competent biomechanical properties for tissueengineering ***,PCL is hydrophobic intrinsically and poor in cell-biomaterial *** this study,we prepared a composite based on PCL and bioactive tantalum(Ta)to understand the effects of direct laser micropatterning on composite surface *** PCL/Ta composite after preparation was surface-patterned by femtosecond laser and characterized with surface morphology,crystal structure,chemical composition,wettability and cellular response of *** was found that laser micropatterning enlarged the difference of wetting properties(~15°)on PCL and PCL/Ta *** wetting changes was dependent on both material composition and lasermachined *** blending of Ta enhanced surface wettability with prolonged contact time on the laser-machined line and rectangle *** vitro culture results showed beneficial effects of laser micropatterning on cell morphology of the *** the PCL/Ta surfaces with line and rectangle microarrays,the cells were more likely to bridge the sidewalls of the microgrooves,showing adaptive 3D morphologies to the micro/nano topographies on the *** findings are envisaged to facilitate surface design and micropattern optimization for favorable tuning the cell response to biomedical PCL/Ta composites.

关键词： laser micropatterning biomaterials poly(ε-caprolactone) tantalum

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Deep peak property learning for efficient chiral molecules ECD spectra prediction

arXiv

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arXiv 2024年

作者： Li, Hao Long, Da Yuan, Li Tian, Yonghong Wang, Xinchang Mo, Fanyang School of Electronic and Computer Engineering Peking University Shenzhen China -Preferred Program Peking University Shenzhen Graduate School Shenzhen China College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Peng Cheng Laboratory Shenzhen China School of Materials Science and Engineering Peking University Beijing China

Chiral molecule assignation is crucial for asymmetric catalysis, functional materials, and the drug industry. The conventional approach requires theoretical calculations of electronic circular dichroism (ECD) spectra, which is time-consuming and costly. To speed up this process, we have incorporated deep learning techniques for the ECD prediction. We first set up a large-scale dataset of Chiral Molecular ECD spectra (CMCDS) with calculated ECD spectra. We further develop the ECDFormer model, a Transformer-based model to learn the chiral molecular representations and predict corresponding ECD spectra with improved efficiency and accuracy. Unlike other models for spectrum prediction, our ECDFormer creatively focused on peak properties rather than the whole spectrum sequence for prediction, inspired by the scenario of chiral molecule assignation. Specifically, ECDFormer predicts the peak properties, including number, position, and symbol, then renders the ECD spectra from these peak properties, which significantly outperforms other models in ECD prediction, Our ECDFormer reduces the time of acquiring ECD spectra from 1-100 hours per molecule to 1.5s. Copyright © 2024, The Authors. All rights reserved.

关键词： Forecasting

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Mo2C@3D ultrathin macroporous carbon realizing efficient and stable nitrogen fixation

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science China Chemistry 2020年第11期63卷 1570-1577页

作者： Zhiwei Fang Desiree Fernandez Nana Wang Zhongchao Bai Guihua Yu Materials Science and Engineering Program Texas Materials InstituteThe University of Texas at AustinAustinTexas 78712United States Institute for Superconducting and Electronic Materials University of WollongongInnovation CampusWollongongNew South Wales 2500Australia

Ammonia is a key feedstock of fertilizers for farming and convenient hydrogen carrier as an emerging clean fuel,but industrial ammonium production process,Haber-Bosch reaction,is an energy-intensive process,consuming 1%–2%of global energy and producing 3%global *** nitrogen reduction reaction(NRR)is one of the most promising routes to realize highly efficient NH3 production under ambient ***,up to now,few precious-metal-free electrocatalysts with desirable catalytic performance have been *** this work,Mo2C nanodots anchored on three-dimensional ultrathin macroporous carbon(Mo2C@3DUM-C)framework is developed toward significantly enhanced nitrogen reduction *** to the special structural design of 3D ultrathin macroporous carbon and highly active and stable Mo2C toward N2 electrochemical reduction,the Mo2C@3DUM-C framework exhibits a high Faradaic efficiency of 9.5%for NH3 production at−0.20 V and the yield rate reaches 30.4µg h−1 mgMo2C−*** electrochemical characterizations reveal the enhanced electron transfer and increased electrochemical surface area in the 3D macroporous carbon ***,the Mo2C@3DUM-C electrocatalysts hold high catalytic stability after long-term NRR *** temperature-dependent yield rate of NH3 demonstrates that the activation energy of nitrogen reduction on the employed catalyst was calculated to be 28.1 kJ mol−*** proposed earth-abundant Mo2C@3DUM-C demonstrates an alternative insight into developing efficient and stable nitrogen fixation catalysts in acids as alternatives to noble metal catalysts.

关键词： electrocatalyst nitrogen fixation nanoparticles molybdenum macroporous carbon

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Scalable Production of Photovoltaic-Grade WSe2 via Tungsten Selenization

Scalable Production of Photovoltaic-Grade WSe2 via Tungsten ...

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IEEE Conference Photovoltaic Specialists (PVSC)

作者： Kathryn M. Neilson Sarallah Hamtaei Koosha Nassiri Nazif Joshua M. Carr Sepideh Rahimi Frederick Nitta Guy Brammertz Jeffery L. Blackburn Joke Hadermann Krishna C. Saraswat Obadiah G. Reid Bart Vermang Alwin Daus Eric Pop Dept. of Electrical Engineering Stanford Univ. Stanford CA United States Hasselt Univ. imo-imomec Hasselt Belgium Imec imo-imomec Genk Belgium EnergyVille imo-imomec Genk Belgium Materials Science & Engineering Program Univ. Colorado Boulder Boulder CO United States Univ. Antwerp Electron Microscopy for Materials Science (EMAT) Antwerp Belgium Dept. of Materials Science & Engineering Stanford Univ. Stanford CA United States University of Colorado Boulder Renewable and Sustainable Energy Institute Golden CO United States

ISBN: (数字)9781665464260

ISBN: (纸本)9781665475822

Transition metal dichalcogenides (TMDs) hold significant promise for photovoltaic applications with high specific power thanks to their high absorption coefficients enabling ultrathin form factor., desirable band gaps for solar energy harvesting, and dangling-bond-free surfaces. Nevertheless, their small-scale synthesis methods have limited their practicality for commercial use. Here, we address this shortcoming and report an industrial, wafer-scale, and rapid selenization method to synthesize thickness-tunable TMD films (i.e., WSe2) from (pre-patterned) sputtered tungsten layers, using solid source selenium or H2Se precursors. These absorbers are shown to have a smooth surface, with a layered van der Waals structure, and charge carrier lifetimes up to 144 ns, over 14x higher than large-area TMD films previously demonstrated. Such high carrier lifetimes correspond to a power conversion efficiency of nearly 22% and a specific power of nearly 64 W/g in a packaged solar cell or almost 3 W/g in a fully packaged module.

关键词： Photovoltaic systems Films Tungsten Solar energy Production Solids Selenium Transition metal dichalcogenides Power conversion Charge carrier lifetime

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Measurement of Cationic Diffusivity Through Er2O3/Y2O3 Interdiffusion Under AC-Flash Event

SSRN

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SSRN 2024年

作者： Yang, Ying Masuda, Hiroshi Yoshida, Hidehiro Department of Materials Science and Engineering School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Next Generation Zirconia Social Cooperation Program Institute of Engineering Innovation The University of Tokyo 2-11-16 Yayoi Bunkyo-ku Tokyo113-8656 Japan

The diffusivity of Er cations in Y2O3 was directly investigated using Er2O3/Y2O3 interdiffusion couples under alternating current (AC) flash events. Compared to the conventional heat treatment with no electric field, the AC-flash treatment resulted in a 3-times longer diffusion distance within a 33-times shorter duration at comparable specimen temperatures. This indicates that the cationic interdiffusion was athermally promoted by an AC electric field. At the specimen temperatures of 1520℃–1760℃, both the lattice and grain boundary diffusivities were 2–3 orders greater under AC-flash events than without the electric field. Grain growth and grain boundary migration associated with remarkable grain boundary bowing-out were also enhanced with increasing current density. The pronounced decrease in the activation energy of grain boundary diffusion under flash events was suggested as the origin of the athermal effect of AC electric field on the mass transport kinetics. © 2024, The Authors. All rights reserved.

关键词： Grain growth

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Effect of Deformation Temperatures on Microstructure of Aq80 Magnesium Alloy Under Repeated Upsetting-Extrusion

SSRN

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SSRN 2022年

作者： Fan, Yutian Lu, Liwei Zhang, Hua Zhao, Hongliang Wu, Zhiqiang Jia, Weitao Xue, Yong Wang, Wen School of Materials Science and Engineering Hunan University of Science and Technology Xiangtan411201 China Institute for Advanced Studies in Precision Materials Yantai University Yantai264005 China College of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China College of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan030024 China School of Material Science and Engineering North University of China Taiyuan030051 China School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi’an University of Architecture and Technology Xi'An710055 China

A new RUE process was proposed to improve the microstructure and the mechanical properties of Mg alloys. The effects of deformation temperature on the microstructure and microhardness of RUEed AQ80 Mg alloy were studied. The results showed that the Mg alloy is subjected to sufficient corner shear deformation, upsetting deformation, and extrusion deformation, resulting in a large and uniformly distributed effective strain after RUE deformation. The microstructure is refined to an average grain size of 2.1 μm by the CDRX mechanism at 250 °C. As the temperature increases to 300°C, the DDRX mechanism is activated and the average grain size is refined to 1.6 µm by the combined effect of CDRX and DDRX. The orientations of the CDRXed grains have a clearly preferred orientation in relation to the parent grains, but those of the DDRXed grains are entirely different from their parent grains. At 350 °C, {10-12} extension twins appear in the microstructure, and the TDRX mechanism plays an important role in grain refinement. With the two strengthening mechanisms of fine-grained strengthening and dislocation strengthening, the microhardness of the 250 °C sample is greatly improved, with an increase of about 35.1% compared to the initial sample. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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P-210: Photolithography Patterning of Organic Light-Emitting Diodes Using Solvent Resistant Electron Transport materials

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SID Symposium Digest of Technical Papers 2024年第1期55卷 2181-2183页

作者： Hyunjin Yu Eun Yeong So Kyunghyun Eun Byung Jun Jung Myungwoong Kim Jin-Kyun Lee Jun Yeob Lee School of Chemical Engineering Sungkyunkwan University 2066 Seobu-ro Jangan-gu Suwon-si Gyeonggi-do Republic of Korea 16419 Department of Materials Science and Engineering University of Seoul Seoul Republic of Korea 02504 Department of Chemistry and Chemical Engineering Inha University Incheon Republic of Korea 22212 Program in Environment and Polymer Engineering Inha University 100 Inha-ro Michuhol-gu Incheon Republic of Korea 22212

In this paper, we develop a novel approach to achieve ultra-high resolution in organic light-emitting diodes (OLEDs) through a photolithography patterning process. It is important to apply a solvent resistant electron transport layer (ETL) in the photolithography pattering of OLED because of solution coating process of photoresist on the ETL. Therefore, a solvent resistant ETL named 2,7-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9 ′ -spirobi[fluorene] (SBF-Trz) was developed and employed as the ETL of OLEDs. The SBF-Trz demonstrated excellent solvent resistance during photolithography process and enabled device performances comparable to those of the conventional OLED without any photolithography process. It was found that the SBF-Trz ETL is appropriate as the ETL of the OLED patterned by photolithography due to good electron transport property, good stability, and good solvent resistance.

关键词： Organic light-emitting diodes (OLED) Electron Transport Layer (ETL) Photolithography Patterning Reactive Ion Etching (RIE) Micro display Ultra High resolution FMM-Free

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Effect of Deformation Temperatures on Microstructure of Aq80 Magnesium Alloy Under Repeated Upsetting-Extrusion

SSRN

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SSRN 2022年

关键词： Microstructure

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Low-temperature sintering of Li0.33La0.55TiO3 electrolyte for all-solid-state Li batteries

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Journal of the European Ceramic Society 2023年第16期43卷 7543-7552页

作者： Lin, Che-an Ihrig, Martin Kung, Kuan-chen Chen, Hsiang-ching Scheld, Walter Sebastian Ye, Ruijie Finsterbusch, Martin Guillon, Olivier Lin, Shih-kang Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Institute of Energy and Climate Research – Materials Synthesis and Processing Forschungszentrum Jülich GmbH Jülich52425 Germany Department of Chemical Engineering National Taiwan University of Science and Technology No. 43 Keelung Rd. Section 4 Da'an Dist Taipei City106 Taiwan Helmholtz Institute Münster: Ionics in Energy Storage Corrensstr. 46 Münster48149 Germany Research Center National Cheng Kung University Tainan70101 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Core Facility Center National Cheng Kung University Tainan70101 Taiwan

Ceramic solid-state Li batteries have promising electrochemical properties. However, their device integration is hampered by the required high sintering temperature step to obtain good ionic conductivity. The sintering temperature often leads to thermal decomposition of the cathode active material. Advanced sintering techniques, such as field-assisted sintering technology/spark plasma sintering (FAST/SPS), utilizing applied mechanical pressure to achieve a lower sintering temperature and shorter dwell time, are helpful in overcoming thermal stability challenges. While thermal stability issues are overcome by a lower sintering temperature, new challenges in the form of surface impurities arise. Low-temperature sintering does not thermally decompose surface impurities which causes low grain boundary conductivity and thus low total ionic conductivity. In this work, a cleaning method and a low-temperature sintering process is exemplarily developed for Li0.33La0.55TiO3 (LLTO) and the impact of applied mechanical pressure during FAST/SPS on the total ionic conductivity and the phase stability of LLTO is revealed. © 2023 Elsevier Ltd

关键词： Spark plasma sintering

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