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SSRN 2022年

作者： Rieland, Julie M. Hu, Zeyuan Deese, Julian S. Love, Brian J. The University of Michigan United States Department of Materials Science and Engineering Department of Biomedical Engineering Macromolecular Science and Engineering Graduate Program

Microplastics are a growing environmental concern, with a large body of evidence documenting substantial distribution of plastic material in virtually all environmental compartments. Countermeasures that help to bind, aggregate, or coalesce these distributed particles might result in lower human and animal exposures. Pressure sensitive adhesives (PSAs) have been identified as a viable microplastic (MP) capture mechanism with a range of potential use conditions. As with any countermeasure, there is a need to evaluate potential solutions in terms of collection efficiency, cost, ease of installation, etc. Expanding on our previous work, spray-coated PSAs were investigated as submerged surfaces as tools to assess MP binding in aqueous dispersions. Resins containing two differing molecular weights of poly(2-ethylhexyl acrylate) PSA (92k and 950k), and a 50:50 by weight mixture of the two resins were applied as spray-coated substrates to compare the effect of resin composition on MP-adhesive binding. Thin films of PSA (92k 6 ± 1 μm, 950k 4 ± 2 μm, 50:50 BD 6.5 ± 1 μm) were sprayed on borosilicate glass slides using a commercial air brush. Polydisperse nylon-12 particles varying in size from 15-30 µm in diameter were dispersed in deionized water at concentrations between 0.01 and 5 mg mL -1 and agitated under ambient conditions to assess adhesive binding as quantitative comparisons of microparticle capture. Mixed assays were also performed comparing binding of common MP species including polyethylene (50, 200 µm), polystyrene (10 µm), and polyester fibers (1000 µm) to understand how varying composition, size, and form factor affect adsorption. The glass slide method showed increasing linear trends of particle binding with increased adhesive exposure time and MP concentration. The lower molecular weight 92K adhesive had lower viscosity, higher wettability for microplastics but also led to a less stable adhesive film complicating analysis. As a field-deployable scheme for mi

关键词： Aggregates

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Improved thermolytic dehydrogenation of LiBH4 nanoconfined in few-layer graphene with different functionalities

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materials Today Sustainability 2023年 24卷

作者： Guo, R.-F. Hsu, C.-Y. Kostoglou, N. Hinder, S. Baker, M. Mitterer, C. Rebholz, C. Wang, C.-Y. Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Materials Science Montanuniversität Leoben Leoben8700 Austria Department of Mechanical Engineering Sciences University of Surrey GuildfordGU27XH United Kingdom Department of Mechanical and Manufacturing Engineering University of Cyprus 1 Panepistimiou Avenue Nicosia2109 Cyprus

In this work, lithium borohydride (LiBH4) was loaded into plasma-activated nanoporous few-layer graphene (FLG) powders with different specific surface areas (∼400–800 m2/g) and functional groups (carboxyl and amine) to investigate the effect of LiBH4@FLG nanoconfinement on the dehydrogenation properties. It was observed that the dehydrogenation temperature dropped significantly from 463 °C for pure LiBH4 to ∼120 °C for all LiBH4@FLG nanocomposites. This was attributed to the nano-sized pores of the FLG materials that can constrain LiBH4 by nanoconfinement and thus decrease the dehydrogenation temperature. The highest dehydrogenation yield of 83% occurred in LiBH4@FLG with 400 m2/g surface area and amine groups, possibly due to Lewis basic amino groups and better graphitic structure. Moreover, it was found that both the surface area and the graphitic defects on the FLG host materials have an influence on the dehydrogenation kinetics. LiBH4@FLG with 800 m2/g surface area and carboxyl groups possesses the lowest activation energy due to its high surface area and high concentration of graphitic defects. © 2023 Elsevier Ltd

关键词： Graphene

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Exceptional Thermal Stability and mechanical Properties of Dual-Phase Amorphous-Nanocrystalline Al-Mo Alloy Films

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SSRN 2023年

作者： Wang, Caixia Fan, Qi Wang, Tao Yu, Shouming Cao, Linlin Zhang, Guojun School of Materials Science & Engineering Xi’an University of Technology Xi’an710048 China School of Mechanical Engineering Harbin Institute of Petroleum Harbin150028 China

Dual-phase amorphous-nanocrystalline Al100-xMox (x=20, 26, 30) alloy films prepared in the way of dual-phase co-growth directly through magnetron sputtering were studied in terms of thermally induced microstructural evolution and mechanical properties via annealing at 550°C. It was observed that, the annealed Al74Mo26 and Al70Mo30 alloy films maintained stable dual-phase amorphous-nanocrysatlline structure and precipitated Al8Mo3 nano-grains dispersed in amorphous matrix uniformly. After annealing, the surface roughness of Al74Mo26 and Al70Mo30 alloy films remained unchanged of 7.5 nm and the hardness and elastic modulus of them were as high as 13 and 210 GPa which enhanced about 50% and 24% than before, respectively. In contrast, the Al80Mo20 alloy film crystallized completely and mainly contained intermetallic Al12Mo phase along with apparent grain coarsening after annealing, which resulted in significant increase of surface roughness and deterioration of hardness. The excellent thermal stability of dual-phase amorphous-nanocrystalline Al74Mo26 and Al70Mo30 alloy films stem from the small driving force for precipitated Al8Mo3 nano-grain growth, as well as benefit from effect of diffusion field impingement. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

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Summer School on Circular Economy for Sustainable Manufacturing: A Case Study and Lessons Learned 31

Summer School on Circular Economy for Sustainable Manufactur...

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31st CIRP Conference on Life Cycle engineering, LCE 2024

作者： Rejeb, Helmi Ben Muxika, Eñaut Ghadimi, Pezhman Univ. Grenoble Alpes CNRS Grenoble INP G-SCOP Grenoble France Mondragon University Electronics & Computer Science Department - Signal Theory & Communications Arrasate Spain Laboratory for Advanced Manufacturing Simulation and Robotics School of Mechanical & Materials Engineering University College Dublin Belfield Dublin Ireland

The Circular Economy Action Plan is the main building block of the European Green Deal, Europe's new agenda for sustainable growth. Businesses need new technologies, new methods and new industrial organization either to create new businesses or to transform their products, processes and business models. They also need new talents to innovate, create businesses and new jobs, and transform society into a more sustainable one. Circular economy has grown significantly in recent years as a topic taught in engineering curricula. The purpose of this paper is to present the design, implementation and evaluation of a summer school program dedicated to the development, transformation and implementation of circular economy systems and new business models in manufacturing. The program was designed in collaboration with three university partners during a European project and relied on contributions from industrial companies, including start-ups and innovative companies. At the end, some lessons are drawn in order to show the main added value based on the evaluation of this summer school and to identify recommendations for the design and implementation of similar summer schools. © 2024 The Author(s).

关键词： engineering education

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Effect of Current Density on Microstructure, mechanical Behavior and Corrosion Resistance of Black MAO Coating on 6063 Aluminum Alloy

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SSRN 2024年

作者： Yu, Dongliang Jiang, Bo Qi, Xing Wang, Chao Song, Renguo School of Materials Science and Engineering Changzhou University Jiangsu Changzhou213164 China Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Jiangsu Changzhou213164 China School of Aeronautics and Mechanical Engineering Changzhou Institute of Technology Jiangsu Changzhou213032 China

Black micro-arc oxidation (MAO) coatings were prepared on 6063 aluminum alloy using alkaline silicate electrolyte at different current densities. Effect of current densities on the microstructure, mechanical behavior and corrosion resistance of black ceramic coatings was studied. The experimental results indicated that the current density could increase the process voltage, enhance the MAO reaction, increase the coating thickness, reduce the poriness, increase the surface roughness, and improve the mechanical properties (hardness, adhesion, friction and wear). The black MAO coating prepared in the current density with 6A/dm2 had the best corrosion resistance in 3.5wt% NaCl solution, as manifested by a corrosion current density of 3.713´10-7 A/cm2 that was 2 orders of magnitude less than that of the 4A/cm2. The corrosion resistance results were further confirmed through an immersion corrosion test. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance

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Recent Advances in Triboelectric Nanogenerators: From Technological Progress to Commercial Applications

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ACS Nano 2023年第12期17卷 11087-11219页

作者： Choi, Dongwhi Lee, Younghoon Lin, Zong-Hong Cho, Sumin Kim, Miso Ao, Chi Kit Soh, Siowling Sohn, Changwan Jeong, Chang Kyu Lee, Jeongwan Lee, Minbaek Lee, Seungah Ryu, Jungho Parashar, Parag Cho, Yujang Ahn, Jaewan Kim, Il-Doo Jiang, Feng Lee, Pooi See Khandelwal, Gaurav Kim, Sang-Jae Kim, Hyun Soo Song, Hyun-Cheol Kim, Minje Nah, Junghyo Kim, Wook Menge, Habtamu Gebeyehu Park, Yong Tae Xu, Wei Hao, Jianhua Park, Hyosik Lee, Ju-Hyuck Lee, Dong-Min Kim, Sang-Woo Park, Ji Young Zhang, Haixia Zi, Yunlong Guo, Ru Cheng, Jia Yang, Ze Xie, Yannan Lee, Sangmin Chung, Jihoon Oh, Il-Kwon Kim, Ji-Seok Cheng, Tinghai Gao, Qi Cheng, Gang Gu, Guangqin Shim, Minseob Jung, Jeehoon Yun, Changwoo Zhang, Chi Liu, Guoxu Chen, Yufeng Kim, Suhan Chen, Xiangyu Hu, Jun Pu, Xiong Guo, Zi Hao Wang, Xudong Chen, Jun Xiao, Xiao Xie, Xing Jarin, Mourin Zhang, Hulin Lai, Ying-Chih He, Tianyiyi Kim, Hakjeong Park, Inkyu Ahn, Junseong Huynh, Nghia Dinh Yang, Ya Wang, Zhong Lin Baik, Jeong Min Choi, Dukhyun Kyung Hee University Gyeonggi Yongin17104 Korea Republic of Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Mechanical Engineering Soft Robotics Research Center Seoul National University Seoul08826 Korea Republic of Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon16419 Korea Republic of Sungkyunkwan University 2066 Seobu-ro Gyeonggi Suwon16419 Korea Republic of Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Division of Advanced Materials Engineering Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Department of Physics Inha University 100 Inha-ro Incheon22212 Korea Republic of School of Materials Science & Engineering Yeungnam University Gyeongbuk Gyeongsan38541 Korea Republic of 291 Daehak-ro Daejeon34141 Korea Republic of School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Institute of Flexible Electronics Technology of Tsinghua Zhejiang Jiaxing314000 China Nanomaterials and System Lab Major of Mechatronics Engineering Faculty of Applied Energy System Jeju National University Jeju632-43 Korea Republic of School of Engineering University of Glasgow GlasgowG128QQ United Kingdom Seoul02792 Korea Republic of Department of Physics Inha University Incheon22212 Korea Republic of Suwon16419 Korea Republic of Department of

Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources and a number of superior advantages in a wide availability and selection of materials, relatively simple device configurations, and low-cost processing. Significant experimental and theoretical efforts have been achieved toward understanding fundamental behaviors and a wide range of demonstrations since its report in 2012. As a result, considerable technological advancement has been exhibited and it advances the timeline of achievement in the proposed roadmap. Now, the technology has reached the stage of prototype development with verification of performance beyond the lab scale environment toward its commercialization. In this review, distinguished authors in the world worked together to summarize the state of the art in theory, materials, devices, systems, circuits, and applications in TENG fields. The great research achievements of researchers in this field around the world over the past decade are expected to play a major role in coming to fruition of unexpectedly accelerated technological advances over the next decade. © 2023 The Authors. Published by American Chemical Society

关键词： Nanogenerators

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Ultrahigh Efficiency and Energy Density in Tri-Layered Ferroelectric Polymer Composites Utilizing Ultralow Loading of Micro-Sized Plates

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SSRN 2024年

作者： Chen, Jie Wang, Pansong Wang, Zhen Chen, Weixing Li, Meng Jing, Hongmei Wang, Yifei Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices School of Materials Science and Chemical Engineering Xi'an Technological University Xi'An710032 China School of Physics and Information Technology Shaanxi Normal University Xi'An710062 China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University 710049 China

Ferroelectric-based composites have demonstrated tremendous potential in electrostatic capacitor owing to their exceptional dielectric characteristics. However, it is extremely challenge to attain desirable energy density (Ue) and above 95% efficiency (η) under low electric fields in the ferroelectric polymer-based composites because of the dominating electrical conduction loss. Herein, a ferroelectric polymer composites consisting of SrTiO3@SiO2 plates/(PVDF-co-HFP) as inner layer and polycarbonate (PC) as the outer polymer layers is elaborately proposed. The vital role of the multiple interlaminar interfaces (electrode/dielectric interface and interlayer interface) on the reduction of conduction loss and improvement of corresponding energy storage properties of the ferroelectric polymer is verified by experimental and theoretical simulations. The resulting composite with an ultralow loading of SrTiO3@SiO2 plates (0.5 vol%) displays a record high capacitive performance (~8.73 J cm−3) at above 95% η under the low electric field of 280 MV m−1, indicating an enormous ~118% increment of the maximal Ue over the commercial bench-mark BOPP (~4 J cm−3) and far outperforming those of the polymer-based dielectrics reported to date. Along with fast discharge time (9 ns), this contribution presents a versatile and competitive technology for fabricating composites with exceptional energy storage capabilities operating under low electric fields. © 2024, The Authors. All rights reserved.

关键词： Silica

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Microstructural softening induced adiabatic shear banding in Ti-23Nb-0.7Ta-2Zr-O gum metal

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Journal of materials science & Technology 2020年第19期54卷 31-39页

作者： Silu Liu Y.Z.Guo Z.L.Pan X.Z.Liao E.J.Lavernia Y.T.Zhu Q,M,Wei Yonghao Zhao Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Department of Mechanical Engineering University of North Carolina at CharlotteNC 28223-0001USA School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneyNSW 2006Australia Department of Materials Science and Engineering University of Californi1IrvineCA 92697USA Department of Materials Science and Engineering North Carolina State UniversityNC 27695USA

Ti-23Nb-0.7Ta-2Zr-O gum metal(GM)is an attractive candidate material for applications that require superior mechanical *** our earlier investigation of the GM[1],geometrical softening and the generation of adiabatic shear bands(ASBs)were proposed as primary reasons for the documented anisotropic impact *** the present study,electron backscattered diffraction(EBSD)analysis reveals two different deformed microstructures,i.e.,deformed ultrafine grains(UFGs)and dynamically recrystallized UFGs,formed in the ASBs of GM samples processed by extrusion equal channel angular pressing(ECAP),*** calculation of temperature rise during dynamic compression suggests that the above microstructure differences in the ASBs was originated from their different maximum ASB temperatures(608 K for extruded GM and 1159 K for ECAP-processed GM).Moreover,our calculation on the temperature at the onset of ASBs indicates that microstructural softening is the primary cause for the development of ASBs in both extruded GM(321 K)and ECAP-processed GM(331 K).

关键词： Gum metal Split hopkinson bar Adiabatic shear band Microstructures

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Modification of Cold Sprayed CoCrMo Alloy Coatings via Laser Shock Peening 2nd

Modification of Cold Sprayed CoCrMo Alloy Coatings via Laser...

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2nd International Conference on Advanced Surface Enhancement, INCASE 2021

作者： Sun, Wen Maharjan, Niroj Wu, Kaiqiang Tan, Adrian Wei-Yee Huang, Renzhong Xie, Yingchun Lan, Haiming Chu, Xin Liu, Erjia National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China School of Materials Science and Engineering South China University of Technology Guangzhou510641 China Advanced Remanufacturing and Technology Centre CleanTech Loop Singapore637143 Singapore School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore School of Engineering University of Southampton Malaysia Iskandar Puteri Johor79200 Malaysia

ISBN: (纸本)9789811657627

In this study, CoCrMo alloy coatings were fabricated by high pressure cold spray deposition. Laser shock peening with and without an ablative layer was applied to the coatings. The microstructure characteristics and mechanical properties of the both as-sprayed and laser shock peened CoCrMo coatings were systematically investigated. Laser shock peening without a protective overlay resulted in both mechanical and thermal loading of the coatings, leading to melting and solidification of the outermost surfaces of the coatings along with deformation. For comparison, laser shock peening with a polyvinyl tape as sacrificial layer was also applied to the as-sprayed CoCrMo coatings. It was found that this sacrificial layer could protect the samples from thermal effects and introduce a deep compressive residual stress in the coatings, which resulted in cracks in the coating. Those cracks in the coatings appeared to be continuous and parallel to the coating/substrate interface due to the strong shock wave imposed during the laser peening process. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： CoCrMo alloy coating High pressure cold spray Laser shock peening mechanical properties Microstructure

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Effect of Tio2 Nanoparticles on Microstructure, mechanical Behavior and Corrosion Resistance of Black MAO Coating on 6063 Aluminum Alloy

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SSRN 2024年

作者： Yu, Dongliang Jiang, Bo Qi, Xing Song, Renguo Wang, C. School of Materials Science and Engineering Changzhou University Jiangsu Changzhou213164 China Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Jiangsu Changzhou213164 China School of Aeronautics and Mechanical Engineering Changzhou Institute of Technology Jiangsu Changzhou213032 China

Black ceramic coatings with TiO2 nanoparticles were prepared on 6063 aluminum alloy using micro-arc oxidation (MAO) technique. Effect of TiO2 concentrations on the microstructure, mechanical behavior and corrosion resistance of black ceramic coatings was studied. The experimental results indicated that the TiO2 nanoparticles could increase the coating thickness, reduce the poriness, increase the surface roughness, and improve the mechanical properties (hardness, adhesion, friction and wear). The black MAO coating prepared in the TiO2 concentrations with MAO-1.5Ti had the best corrosion resistance in 3.5wt% NaCl solution, as manifested by a corrosion current density of 3.598×10-9 that was 2 orders of magnitude less than that of the MAO-0Ti . The corrosion resistance results were further confirmed through an immersion corrosion test. © 2024, The Authors. All rights reserved.

关键词： Aluminum corrosion

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