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Aggregate 2022年第4期3卷 85-100页

作者： Pavana Siddhartha Kollipara Ritvik Mahendra Jingang Li Yuebing Zheng Walker Department of Mechanical Engineering The University of Texas at AustinAustinTexasUSA Department of Electrical and Computer Engineering The University of Texas at AustinAustinTexasUSA Material Science and Engineering Program Texas Materials InstituteThe University of Texas at AustinAustinTexasUSA

Developing on-chip functional devices requires reliable fabrication methods with high resolution for miniaturization,desired components for enhanced performance,and high throughput for fast prototyping and mass ***,laser-based bubble-pen lithography(BPL)has been developed to enable sub-micron linewidths,in situ synthesis of custom materials,and on-demand patterning for various functional components and *** exploits Marangoni convection induced by a laser-controlled microbubble to attract,accumulate,and immobilize particles,ions,and molecules onto different *** years have witnessed tremendous progress in theory,engineering,and application of BPL,which motivated us to write this ***,an overview of experimental demonstrations and theoretical understandings of BPL is ***,we discuss the advantages of BPL and its diverse applications in quantum dot displays,biological and chemical sensing,clinical diagnosis,nanoalloy synthesis,and *** conclude this review with our perspective on the challenges and future directions of BPL.

关键词： additive manufacturing capillary flow lithography marangoni convection microbubbles sensing

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Measuring surface energy of solid surfaces using centrifugal adhesion balance

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Physical Review E 2024年第1期110卷 014801-014801页

作者： Appu Vinod Yuval Barak Sakshi Yadav Schmid Semih Gulec Yagnavalkya Bhimavarapu Akash Jena David Katoshevski Nitsa Haikin Rafael Tadmor Department of Mechanical Engineering Materials Transformation Material Science and Engineering Dan F. Smith Department of Chemical Engineering Department of Physics

The standard way to evaluate the solid surface energy using probe liquids relies on contact angle measurements. The measured contact angles rely on visible means and are different from their nanoscopic thermodynamic values. This compromises the surface-energy predictions so much that the surface energy-values can be hundreds of percentages higher than expected based on comparisons with different methods as reported in several studies. We consider the Owen-Wendt approach, which breaks the surface energy to polar and dispersive components, and present a technique for measuring surface energy of solids using probe liquids. Our method avoids the need to measure contact angles; instead, it uses solid-liquid work of adhesion measurements which are performed using a centrifugal adhesion balance. In agreement with the studies mentioned above, we found that indeed, the surface energies of the measured solids are significantly lower than those based on contact angle measurements. More importantly we found that our method results in a reasonable breakdown of the surface energy to polar and dispersive components with a higher polar component for more polar solids. This is in contrast with the surface energy based on contact angle measurements for which the breakdown did not make sense, i.e., the measurements reflected higher polar components of the surface energy for less polar solids.

关键词： Adhesives Coatings

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Performance Analysis of Vortex Tube Refrigeration System by Experimental Method 2nd

Performance Analysis of Vortex Tube Refrigeration System by ...

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2nd International Conference on materials, Design and Manufacturing for Sustainable Environment, ICMDMSE 2022

作者： Aravinth, B. Manivannan, S. Rameshkannan, C. Subramaniyan, M. Raj Kumar, V. Department of Mechanical Engineering Dr. Navalar Nedunchezhiyan College of Engineering Tholudur India Department of Mechanical Engineering Center for Material Science Karpagam Academy of Higher Education Coimbatore India Department of Mechanical Engineering PSG Institute of Technology and Applied Research Coimbatore India

ISBN: (纸本)9789811930522

The vortex tube may be an uncommon cooling device, without a transferring components which could create bloodless air and warm air from suppressed compressed fueloline while now no longer touching the encompassing area. While the competitive air is tangentially injected into the vortex chamber, a robust vortex glide is created that may be divided into two air streams, one warm movement at the rims and any other bloodless in the backbone at every end. It is used economically consisting of cooling of slicing equipment, heating gadget, fridges, etc. It is far weightless and desires a small toilet. Also, the preliminary fee is low, and its running expenses degree a rectangular anywhere suppressed fueloline is provided quickly. The cutting-edge mission is to research the overall performance of the vortex tube with the aid of using dynamical size of air in water and in bloodless climates. The vortex air-cooled tube cooling gadget turned into evolved with the assist of equipment consisting of rotameter, strain transmitter, and RTD temperature sensors. In the course of this experiment, an alittle vortex tube made from stainless steel turned into used. The vortex tube is nicely prepared with ideal insulation. The study agrees with the multiple thermo-physical properties of the compressed gasoline utilised as the active fluid. Strain, air temperature, and air temperature are determined at utterly unique locations for utterly unique pressures of water performance by adjusting the modern terminal control of the vortex tube. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Vortex flow

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Delivering quantum dots to lubricants: Current status and prospect

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Friction 2022年第11期10卷 1751-1771页

作者： Wenling ZHANG Tianhao LI Rong AN Jiong WANG Yu TIAN School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Herbert Gleiter Institute of Nanoscience School of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Very recently,two-dimensional quantum dots(2D QDs)have been pioneeringly investigated as lubricant additives,which exhibit superior friction-reducing and wear *** with 2D nanoparticles,2D QDs possess small size(~10 nm)and abundant active *** distinguished advantages enable them to quickly disperse into common lube mediums and maintain long-term storage *** good dispersion stability of 2D QDs not only effectively improves their embedding capacity,but also enables continuous supplements of lubricants during the sliding ***,2D QDs are attracting increasing research interest as efficient lubricants with desirable service *** this review,we focus on the latest studies of 2D QDs as liquid lubricant additives(both in polar and nonpolar mediums),self-lubricating solid coatings and gels,*** advanced strategies for synthesis and modification of 2D QDs are summarized.A comprehensive insight into the tribological behavior of a variety of 2D QDs together with the associated mechanism is reviewed in *** superior lubricating performances of 2D QDs are attributed to various mechanisms,including rolling effect,self-mending performance,polishing effect,tribofilm formation,nanostructure transfer and synergistic effects,*** for friction modulation of 2D QDs,including internal factors(surface modification,elemental doping)and extrinsic factors(counter surfaces,test conditions)are discussed,special attentions for achieving intelligent tribology toward superlubricity and bio-engineering,are also ***,the future challenges and research directions regarding QDs as lubricants conforming to the concept of“green tribology”toward a sustainable society are discussed.

关键词： quantum dots(QDs) design diversity dispersibility embedding stability lubrication

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Effect of injection timing on the performance of dual fuel engine fueled with algae nano-biodiesel blends and biogas

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materials Today: Proceedings 2022年 59卷 289-296页

作者： Karthik, T. Banapurmath, N.R. Basavarajappa, D.N. Ganachari, Sharanabasava V. Kulkarni, Pratap S. Harari, P.A. Department of Mechanical Engineering Presidency University Karnataka Bangalore India Centre for Material Science School of Mechanical Engineering BVB College of Engineering and Technology KLE Technological University Hubballi India Department of Mechanical Engineering GM Institute of Technology Karnataka Davangere India Department of Mechanical Engineering Proudhadevaraya Institute of Technology Karnataka Hosapete583225 India School of Mechanical Engineering CMR University Karnataka Bengaluru India

The impact of injection time (IT) and nano-biodiesel mix on the performance of the biogas introduced dual fuel engine (DFE) is studied while maintaining fixed injection pressure (IP). Algae oil methyl ester (ALGAEOME), its B20 blend (ALGAEOME B20), and its nano fuel blend (ALGAEOME B20 GO60) utilizing graphene oxide (GO) nanoparticles with a 60 mg dose are utilized as pilot injected fuels in the modified DFE, while biogas (purified) is used as the inducted fuel. The goal of this study is to improve the performance of a DFE as it suffers from lower BTE (Brake Thermal Efficiency) compared to single fuel operation. Higher emissions of diesel engine such as smoke and NOx can be effectively controlled using nano-biodiesel and gaseous fuel mixtures in the modified dual fuel engine. DFE with nano-biodiesel blends-biogas combination can effectively address the emissions of NOx are detected, as well as increase the brake thermal efficiency (BTE) with reduced emissions of carbon monoxide (CO), hydrocarbon (HC), and smoke respectively. Decreased Ignition delay (ID), and higher peak pressure (PP) are obtained. Because of the larger surface area of the GO nanoparticles infused ALGAEOME B20 mix, it resulted in higher improved combustion activity, enhancing the in-cylinder temperature and pressures and heat release rate (HRR). DF engine powered with renewable fuels such as biodiesel and biogas may help to reduce greenhouse gas emissions by partially substituting fossil fuels. Advancing the IT and utilizing nanoparticle-infused biodiesel reduces the smoke, CO, and NOx emissions of biogas powered DF engines and provides overall enhanced engine performance. © 2022

关键词： Biodiesel

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A review on flexibility of free bending forming technology for manufacturing thin-walled complex-shaped metallic tubes

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International Journal of Lightweight materials and Manufacture 2023年第2期6卷 165-188页

作者： Abd El-Aty, Ali Guo, Xunzhong Lee, Myoung-Gyu Tao, Jie Hou, Yong Hu, Shenghan Li, Tao Wu, Cong Yang, Qiucheng Department of Materials Science and Engineering & RIAM Seoul National University 1-Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Jiangsu Province Nanjing211106 China Mechanical Engineering Department Faculty of Engineering-Helwan Helwan University Cairo Egypt

Free bending forming (FBF) is a flexible forming technology that gained significant attention recently because of its broad applications in critical industries such as the automotive, aerospace, and nuclear industries. Thus, this paper aims to present a comprehensive review of FBF technology and its flexibility in manufacturing thin-walled complex-shaped metallic tubes with variable curvatures. First, the historical development and state of the art of FBF technology were reviewed and discussed its importance in tube forming recently. Then, the fundamental principles, theoretical modelling, deformation mechanisms during complex bending, critical process parameters, and forming defects with a discussion of the recent research and technological developments of FBF technology under three-, five- and six-axis processes were explained. After that, the system dies and tools design of the FBF machines and the trajectory control of the bending die were presented. Afterwards, the mechanisms of manufacturing spiral and involute hollow metallic tubes and outstanding solutions for critical issues during tube manufacturing, such as springback, cross-section deformation, over-thinning (even cracking), and wrinkling instability were introduced. Finally, the paper is concluded by providing the discussions on the system, die and tool design methodology, and outlook of the FBF technology. © 2022 The Authors

关键词： Bending (forming)

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Cationization of Cellulose Dissolved in TEAOH/urea Solvent and its Preparation of Cellulose Beads: Effect of Added Amount of GTAC

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2022年第6期54卷 85-93页

作者： Kim, Younglae Jang, Minseok Cho, Byoung-Uk Department of Paper Science & Engineering College of Forest and Environmental Science Kangwon National University Korea Republic of Program of Paper Material Science & Engineering College of Forest and Environmental Science Kangwon National University Korea Republic of

To widen the applications, cationic cellulose beads were synthesized by adding glycidyltrimethylammonium chloride (GTAC) to cellulose fibers dissolved in a mixture of tetraethylammonium hydroxide and urea at room temperature for cationic modification, and dropping the cationic cellulose solution into an acetic acid solution. Herein, the effects of the added GTAC amount on the properties of cationic cellulose soultion and cellulose beads were investigated. It was observed that increasing the amount of GTAC increased the viscosity and surface tension of the cationically modified cellulose solution and increased the particle size of the cellulose beads. Furthermore, the zeta potential of the cellulose beads can be controlled by modifying the GTAC amount. © 2022 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Chemical modification

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Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination

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Rare Metals 2022年第1期41卷 96-105页

作者： Jin-Jin Zhao Xiao Su Zhou Mi Ying Zhang Yan-Jun Hu Hua-Jun Guo Yi-Nan Jiao Yu-Xia Zhang Yan Shi Wei-Zhong Hao Jing-Wei Wu Yi Wang Cun-Fa Gao Guo-Zhong Cao School of Materials Science and Engineering School of Mechanical EngineeringShijiazhuang Tiedao UniversityShijiazhuang 050043China School of Materials Science and Engineering Hebei Key Laboratory of Material Near Net Forming TechnologyHebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation *** this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n... 详细信息

关键词： Lithium ions Ni^(3+) Oxidized defect Photocurrent Perovskite solar cells

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On the Necessity for Improving Effectiveness of Qualification Process for Spare Parts Additive Manufacturing in a Circular Economy Supply Chain

On the Necessity for Improving Effectiveness of Qualificatio...

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

作者： Chandima Ratnayake, R.M. University of Stavanger Department of Mechanical and Structural Engineering and Material Science Norway

ISBN: (数字)9781665486873

ISBN: (纸本)9781665486873

Additive manufacturing (AM) has attracted extensive research attention, due to the flexibility and capability to deal with additive manufactured (AM 'ed) parts with complicated geometries. Benefiting from the recent development of material technology, manufacturing control tools, and integrated platforms, powder bed fusion (PBF) based AM has been successfully extended to build free form metallic parts. A more comprehensive understanding of the powder processing thermos mechanical metallurgical characteristics correlation is still lacking for the metallic AM. The metallic AM process involves non-uniform temperature distributions and rapid thermal cycles that result in microstructures featured with porosity and anisotropy. The different microstructure features critically affect the mechanical properties of the AM'ed parts. It is necessary to establish optimal parameters' combination that provides predefined microstructure in an AM process to achieve desired mechanical properties of the AM builds. The AM'ed parts qualification is a requirement to assure accurate and repeatable builds. First, this manuscript demonstrates the use of parameter design approach for simulations and experimental validation to establish optimal parameter combinations to develop a qualification record. Second, it presents a framework illustrating how to perform feedstock metal powder production, AM of parts, qualification, and reuse of material in an integrated circular economy supply chain. © 2022 IEEE.

关键词： Supply chains

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Spontaneous Self-healing Bio-inspired Lubricant-infused Coating on Pipeline Steel Substrate with Reinforcing Anti-corrosion,Anti-fouling,and Anti-scaling Properties

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Journal of Bionic engineering 2022年第6期19卷 1601-1614页

作者： Hao Li Yujie Peng Kai Zhang Pengchang Li Lei Xin Xiaoli Yin Sirong Yu School of Material Science and Engineering Shandong University of Science and TechnologyQingdao266590China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of Petroleum(East China)Qingdao266580China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao266580China

Superhydrophobic surfaces(SHS)and slippery lubricant-infused porous surfaces(SLIPS)attract great attention due to their multiple properties in both industries and our daily ***,we first fabricated the SHS with micro-scale flower-like structures composed of nano-sheets on pipeline steel ***,we obtained the SLIPS by spin-coating lubricant into gaps of micro-scale flower-like structures,with the air still trapped among gaps of *** SLIPS shows excellent liquid repellency as the *** SLIPS also shows stability after the scour of flowing *** results of polarization curves(Tafel)and electrochemical impedance spectroscopies deduced the SLIPS with better and more stable anti-corrosion property than the *** with the SHS,the lack of attachment and CaCO_(3) on the SLIPS indicates that the SLIPS demonstrates better anti-fouling and anti-scaling properties than the ***,the SLIPS shows promising wear resistance under the abrasion simulated by sandpaper compared with the ***,the air trapped among nano-sheets is conducive to the lubricant flowing to the surface quickly,exhibiting spontaneous self-healing in atmosphere,even if part flower-like structures of the SLIPS subject to damage with the lubricant consumed after scratched.

关键词： Pipeline steel Bioinspiration Slippery surface Self-healing

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