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Influence of deformation zone length on bending radius of SS304 tubes with small diameters manufactured via free bending-based active motion

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Chinese Journal of Aeronautics 2023年第6期36卷 420-434页

作者： Shenghan HU Cheng CHENG Ali Abd EL-ATY Shuo ZHENG Xunzhong GUO Chunmei LIU Jie TAO College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 21ll00China Department of Materials Science and Engineering&RIAM Seoul National UniversityI-Gwanak-roGwanakguSeoul 08826Republic of Korea Mechanical Engineering Department Faculty of Engineering-HelwanHelwan UniversityCairo 11795Egypt

In three and six-axis free-bending equipment,the deformation zone length(A)is a fixed mechanical structure parameter modified when the relevant structure is redesigned and *** this study,a six degree of freedom(6-DOF)parallel mechanism was used as the control mechanism of the bending die,and a new method of changing the deformation zone length(A)was ***,an idealized geometric model of free bending-based active motion was ***,the influence of the deformation zone length(A)on the bending moment and the bending radius of the tube was *** addition,the finite element simulation and a kinematic model of free bending-based active motion controlled by the 6-DOF parallel mechanism were established,and bending processes of the SS304 tube with different deformation zone lengths were ***,the impact of the deformation zone length(A)on the bending radius,bending moment,wall thickness,and motion of the parallel mechanism were ***,experiments were carried out on the free-bending equipment based on the 6-DOF parallel *** verified the rules in the theoretical analysis,finite element simulation,and kinematic simulation.

关键词： Bending radius Deformation zone length 6-DOF parallel mechanism Free bending-based active motion Small diameter tube

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Bending the Rule: Naphthobisthiadiazole-Based Terpolymers with Both High Solubility and Crystallinity for Organic Photovoltaics

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ACS Applied Polymer materials 2024年第5期6卷 2586-2593页

作者： Chou, Li-Hui Chen, Fengkun Nakano, Kyohei Yamanaka, Kodai Mikie, Tsubasa Saito, Masahiko Liu, Cheng-Liang Tajima, Keisuke Osaka, Itaru Department of Applied Chemistry Graduate School of Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8527 Japan Department of Chemical and Materials Engineering National Central University Taoyuan32001 Taiwan Saitama Wako351-0198 Japan Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8527 Japan Department of Materials Science and Engineering National Taiwan University Taipei10617 Taiwan

Achieving a good balance between the crystallinity and solubility is of great importance in the design of π-conjugated polymers. Here, we synthesized a series of terpolymers in which small fractions of a planar V-shaped fused ring, triphenyleno[1,2-c:7,8-c′]bis([1,2,5]thiadiazole) (TPTz), are incorporated into the linear-shaped backbone of a highly crystalline polymer based on naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole) (NTz), PNTz4T. Due to the "bending" structure induced by the TPTz unit, the terpolymers had greatly improved solubility by about 5-9 times compared to the linear-shaped PNTz4T. In particular, the terpolymers preserved the crystallinity of PNTz4T to a considerable extent with a higher fraction of face-on oriented domains in films. As a result, the highly solution-processable terpolymers exhibited high photovoltaic performances and slightly outperformed PNTz4T. Our results indicate that the incorporation of a V-shaped unit into a linearly shaped polymer is a good strategy to develop π-conjugated polymers with high solubility and crystallinity. © 2024 American Chemical Society.

关键词： Solubility

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Natural dyes in textile printing: parameters, methods, and performance

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Environmental science and Pollution Research 2024年第35期31卷 47552-47583页

作者： Repon, Md. Reazuddin Islam, Tarekul Paul, Tamal Krishna Jurkonienė, Sigita Haji, Aminoddin Shukhratov, Sharof Toki, Gazi Farhan Ishraque Laboratory of Plant Physiology Nature Research Centre Akademijos g. 2 Vilnius08412 Lithuania Department of Production Engineering Faculty of Mechanical Engineering and Design Kaunas University of Technology Studentų 56 Kaunas51424 Lithuania Department of Textile Engineering Daffodil International University Dhaka1216 Bangladesh ZR Research Institute for Advanced Materials Sherpur2100 Bangladesh Department of Materials Science and Engineering King Fahd University of Petroleum and Minerals Dhahran31261 Saudi Arabia Department of Textile Engineering Faculty of Mechanical Engineering Khulna University of Engineering & ampTechnology Khulna9203 Bangladesh Department of Textile Engineering Yazd University Yazd Iran Department of Technological Education Fergana State University Fergana150100 Uzbekistan State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201620 China National Institute of Textile Engineering and Research University of Dhaka Dhaka1000 Bangladesh

In recent years, consumer preferences have begun to turn back to natural dyes, whereas synthetic dyes have been pushed into the background over the previous 60 years. This is a result of increased knowledge of the potential hazards associated with the creation of synthetic dyes, which use raw materials derived from petrochemicals and involve intense chemical interactions. Such dyes need a lot of energy to produce, and their negative effects on the environment increase pollution. It has been discovered that several of these dyes, particularly the azo-based ones are carcinogenic. On the contrary, natural dyes are getting more attention from scientists and researchers as a result of their several advantages like being eco-friendly, biodegradable and renewable, sustainable, available in nature, having no disposal problems, minimizing the consumption of fossil fuel, anti-bacterial, insect repellent, and anti-allergic, anti-ultraviolet, intensify dyeing and finishing process efficiency, less expensive, and no adverse effects on human health and environment. However, there are also some drawbacks, like poor fastness properties, natural dye printing for bulk production, difficulties in reproducibility of shades, and so forth. Despite all these limitations, the demand for natural dyes is increasing significantly in textile industries because they offer far more safety than synthetic dyes. This study provides an overall concept of the natural dyes in textile printing. It illustrates parameters of printing performance, methods, and techniques of extraction of natural dyes, printing methods, and printing of natural and synthetic fibers. Finally, this study describes the challenges and future prospects of natural dyes in textile printing. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Textile industry

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3D-printed,citrate-based bioresorbable vascular scaffolds for coronary artery angioplasty

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Bioactive materials 2024年第8期38卷 195-206页

作者： Yonghui Ding Liam Warlick Mian Chen Eden Taddese Caralyn Collins Rao Fu Chongwen Duan Xinlong Wang Henry Ware Cheng Sun Guillermo Ameer Centre for Advanced Regenerative Engineering(CARE) Northwestern UniversityEvanstonIL 60208USA Department of Biomedical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Surgery Feinberg School of MedicineNorthwestern UniversityChicagoIL 60611USA

Fully bioresorbable vascular scaffolds(BVSs)aim to overcome the limitations of metallic drug-eluting stents(DESs).However,polymer-based BVSs,such as Abbott’s Absorb,the only US FDA-approved BVS,have had limited use due to increased strut thickness(157μm for Absorb),exacerbated tissue inflammation,and increased risk of major cardiac events leading to inferior clinical performance when compared to metallic *** we report the development of a drug-eluting BVS(DE-BVS)through the innovative use of a photopolymerizable,citrate-based biomaterial and a high-precision additive manufacturing *** with a clinically relevant strut thickness of 62μm can be produced in a high-throughput manner,*** BVS per minute,and controlled release of the anti-restenosis drug everolimus can be achieved by engineering the structure of polymer coatings to fabricate drug-eluting *** achieved the successful deployment of BVSs and DE-BVSs in swine coronary arteries using a custom-built balloon catheter and BVS delivery system and confirmed BVS safety and efficacy regarding maintenance of vessel patency for 28 days,observing an inflammation profile for BVS and DE-BVS that was comparable to the commercial XIENCE^(TM)DES(Abbott Vascular).

关键词： coronary inflammation balloon

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Effects of process parameters and many-objective optimisation of SiC/TiC/16MnCr5 coating deposited through laser cladding using NSGA III

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International Journal of Advanced Manufacturing Technology 2025年第7期138卷 3371-3403页

作者： Kyekyere, Ernest Onyono, Seth Omwenga Olakanmi, Eyitayo Olatunde Prasad, Raghupatruni Ventaka Satya Botes, Annelize Pityana, Sisa Lesley Skhosane, Samuel Department of Mechanical Energy & Industrial Engineering Botswana International University of Science & Technology Palapye Botswana Botswana International University of Science & Technology Palapye Botswana Research Group Botswana International University of Science & Technology Palapye Botswana Department of Chemical Materials and Metallurgical Engineering Botswana International University of Science & Technology Palapye Botswana Department of Mechanical Engineering Nelson Mandela University Port Elizabeth South Africa Laser-Enabled Manufacturing Research Group Council for Scientific & Industrial Research Pretoria South Africa

Due to its several advantages, laser cladding has been used to enhance the surface properties of parts subjected to severe loading conditions. Despite its benefits, the performance and quality characteristics of the coatings produced depend highly on the complex relationship between the coating materials and the process variables. Hybrid reinforcements such as TiC and SiC in metal matrix composites can provide synergistic benefits for components used in extreme environments, like mining, by significantly enhancing wear resistance and mechanical properties. In this work, the effect and many-objective optimisation of the laser processing variables were carried out on TiC/SiC/16MnCr5 multi-track composite coating on A514 steel. By employing hybrid response surface modelling (RSM) and non-dominated sorting genetic algorithm III (NSGA III), the effect of scanning speed (S), powder feed rate (F), and laser power (P) on coating aspect ratio, dilution, microhardness, and wear resistance were investigated and optimised. The influence of the process variables on aspect ratio, dilution, microhardness, and wear volume loss are in this order, respectively: S > P > F;S > F > P;P > F > S;and P > S > F. The interaction of the process parameters was significant. The wear resistance and microhardness were enhanced due to the partial dissolution of carbides in the matrix. Based on the NSGA III optimisation, the optimal process parameters identified were P = 1550 W, S = 500 mm/min, and F = 7 g/min. The validation experiment revealed a close agreement with the predicted results, with errors of less than 5% for all the objectives. The optimised coating’s microstructure consisted predominantly of columnar crystals with minor regions of equiaxed dendrites. Compared to the substrate, the optimised coating’s microhardness improved by 350%, while its compressive strength was enhanced by 41%. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Microhardness

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A Miniaturized CMOS-MEMS Amperometric Gas Sensor for Rapid Ethanol Detection

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IEEE Sensors Journal 2023年第8期23卷 8128-8137页

作者： Thu, Do Thi Liu, Zong-Han Lee, Ya-Chu Kuo, Tzu-Wen Sung, Wei-Lun Chu, Yen-Chang Chueh, Yu-Lun Fang, Weileun Institute of NanoEngineering and MicroSystem National Tsing Hua University Department of Power Mechanical Engineering Department of Materials Science and Engineering Hsinchu30013 Taiwan Hsinchu Science Park PixArt Imaging Inc. Hsinchu30076 Taiwan

This study presents the design and implementation of a chip-scale amperometric ethanol sensor using the standard commercially available complementary metal oxide semiconductor (CMOS) process together with the post-CMOS micromachining processes. The presented amperometric sensor consists of a suspended plate with a microhole structure as the working electrode, a fully anchored plate with a microhole structure as the counter electrode, and a microcavity as the electrolyte reservoir. The metal and dielectric layers inherent in the standard CMOS process are exploited to realize these structures. The electrode with a microhole structure could enhance its surface area to improve the sensitivity of the sensor. The suspended working electrode covered a thinner Nafion R layer could facilitate gas diffusion to shorten the response time of the sensor. To characterize the ethanol sensing, a Ni film is deposited on the working electrode. Measurements indicate the presented sensor has a sensing range of ppm (20-1000 ppm) at room temperature. Moreover, its sensitivity and response time are, respectively, 0.01 nA/ppm and 6 s. The presented design shows the CMOS-MEMS is a promising approach to realize the amperometric ethanol sensor. © 2001-2012 IEEE.

关键词： Electrolytes

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Role of Microstructural Heterogeneity on Nanoscale mechanical Properties and Wear Responses of Additively Manufactured CoCrNi Medium Entropy Alloy and 316L Stainless Steel

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Journal of materials engineering and Performance 2024年第12期33卷 5717-5726页

作者： Vashishtha, Himanshu Kumar, Deepak Kim, You Sub Lee, Soo Yeol Huang, E-Wen Jain, Jayant Department of Materials Science and Engineering Indian Institute of Technology Delhi New Delhi110016 India School of Metallurgy and Materials University of Birmingham BirminghamB15 2TT United Kingdom Department of Mechanical Engineering Carnegie Mellon University 5000 Forbes Ave PittsburghPA15213 United States Department of Materials Science and Engineering Chungnam National University Daejeon34134 Korea Republic of Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsin-Chu30013 Taiwan

In the present study, a systematic comparison of additively manufactured CoCrNi medium entropy alloy having face-centered-cubic (FCC) structure with standard FCC materials 316L austenitic stainless steel was carried out. The effect of energy density (71 J/mm2) on microstructural heterogeneity and crystallographic orientation of planes parallel to the build direction (X–Z) and perpendicular to the build direction (X–Y) was recorded. Scanning electron microscopy, x-ray diffraction and electron backscattered diffraction techniques were used to reveal the surface and structural features. The effect of repetitive heating associated with layer-by-layer deposition of the X–Z axis was reflected as the favorable formation of the (1 1 1) plane at the expense of the (2 2 0) plane. The low angle grain boundaries at the X–Z axis have been decreased by ~ 27% compared to the X–Y axis for CoCrNi, while a ~ 17% reduction was recorded for 316L austenitic stainless steel. Furthermore, the decreasing trends in nanomechanical properties and wear resistance were observed, with a low number of low angle grain boundaries at the X–Z axis, by employing a nanoindenter. Significant microcracks in CoCrNi medium entropy alloy manifest the brittle fracture mode, whereas 316L alloy denotes the mixed type of failure mode. © ASM International 2023.

关键词： Cobalt alloys

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Regulating the radical intermediates by conjugated units in covalent organic frameworks for optimized lithium ion storage

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Journal of Energy Chemistry 2022年第6期31卷 428-433,I0012页

作者： Shuai Gu Xiaoxia Ma Jingjing Chen Rui Hao Zhiqiang Wang Ning Qin Wei Zheng Qingmeng Gan Wen Luo Muqing Li Zhiqiang Li Kemeng Liao Hao Guo Guiyu Liu Kaili Zhang Zhouguang Lu Department of Materials Science and Engineering Shenzhen Key Laboratory of Interfacial Science and Engineering of MaterialsGuangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesSouthern University of Science and TechnologyShenzhen 518055GuangdongChina Department of Mechanical Engineering City University of Hong KongKowloonHong Kong 999077China

Organic active units often transform into radical intermediates during the redox processes but exhibit poor cycling stability due to the uncontrollable redox of the radicals. Herein, we report a facile and efficient strategy to modulate the molecular orbital energies, charge transport capacities, and spin electron densities of the active units in covalent organic frameworks(COFs) via regulating the conjugated unit size to optimize the redox activity and stability of the organic radicals. COFs based on different imide conjugated units exhibit tunable discharge voltages, rate performance and cycling stabilities. Detailed characterizations and theoretical calculation reveal that imide radicals are the important active intermediates during the redox processes of these COFs. Specifically, increasing the size of the imide conjugated units could effectively delocalize the radical electrons and improve the stability of the COFs electrodes. This study offers a very effective strategy to modulate the redox chemistry of organic materials for electrochemical energy storage.

关键词： Organic electrodes Radical intermediates Covalent organic frameworks

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Effect of Surface Roughness on the Magnetism, Nano-indentation, Surface Energy, and Electrical Properties of Co60Fe20Dy20 Films on Si (100) Substrate

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Journal of Electronic materials 2024年第4期53卷 1752-1762页

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Lin, Chih-Chien Chen, Pei-Ling Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung City80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

In this study, we focused on depositing a target material, cobalt-iron-dysprosium (Co60Fe20Dy20), onto silicon (Si) (100) substrates with thickness varying from 10 nm to 50 nm through a direct-current (DC) magnetron sputtering technique. The subsequent step involved subjecting the samples to an hour-long annealing process in a vacuum annealing furnace at temperatures of 100°C, 200°C, and 300°C. To assess the elemental composition of the CoFeDy films, energy-dispersive X-ray spectroscopy (EDS) was employed. An observed trend indicated an increase in low-frequency alternating-current magnetic susceptibility (χac) with the increasing thickness. Remarkably, the CoFeDy films exhibited their peak χac following annealing at 300°C, with an optimal resonance frequency of 50 Hz. After annealing at 300°C, the CoFeDy film’s surface energy peaked at 50 nm. The magnetic, electrical, and adhesive properties of the CoFeDy films were notably influenced by surface roughness at different annealing temperatures. Atomic force microscopy (AFM) analysis revealed a gradual reduction in film roughness post-annealing, corresponding to smoother surfaces indicative of a weaker domain wall pinning effect, heightened carrier conductivity, and increased liquid spreading. Collectively, these outcomes contributed to diminished χac, reduced electrical resistance, and enhanced adhesion. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Adhesion

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Scalable synthesis of hcp ruthenium-molybdenum nanoalloy as a robust bifunctional electrocatalyst for hydrogen evolution/oxidation

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Journal of Energy Chemistry 2022年第9期31卷 176-185,I0006页

作者： Zhen Zhang Haijun Liu Liwen Ni Zhi-Liang Zhao Hui Li School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Department of Materials Science and Engineering Shenzhen Key Laboratory of Hydrogen EnergySouthern University of Science and TechnologyShenzhen 518055GuangdongChina Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

The hydrogen evolution reaction(HER)is the cathodic process of water splitting,and its reverse,the hydrogen oxidation reaction(HOR),is the anodic process of an H-Ofuel cell;both play important roles in the development of hydrogen *** rational design and scalable fabrication of low-cost and efficient bifunctional catalysts for the HER/HOR are highly ***,ultrasmall Mo-Ru nanoalloy(Mo_(0.5)Ru_(3)and Mo_(0.5)Ru_(3))particles uniformly distributed on mesoporous carbon(MPC)were successfully synthesized by a simple method that is easy to scale up for mass *** the incorporation of Mo atoms,the as-prepared Mo_(0.5)Ru_(3)and Mo_(0.5)Ru_(3)nanoalloys maintain a hexagonal-close-packed crystal *** acidic media,Mo_(0.5)Ru_(3)exhibits excellent Pt-like HER and HOR activity,as well as good *** functional theory(DFT)calculations reveal that the H adsorption free energy(ΔG)on the Mo_(0.5)Ru_(3)(001)surface(-0.09 eV)is much closer to zero than that of metallic Ru(-0.22 eV),which contributes to the enhanced catalytic *** alkaline media,Mo_(0.5)Ru_(3)also presents outstanding HER and HOR activity,even significantly outperforming Pt/*** DFT results confirm that optimal binding energies with H*and OH*intermediate species,and low energy barriers in the water dissociation and formation steps,efficiently accelerate the alkaline HER/HOR kinetics of Mo_(0.5)Ru_(3).This study provides a new avenue for the scalable fabrication of high-efficiency bifunctional electrocatalysts for the HER and HOR in both acidic and alkaline media.

关键词： Hydrogen evolution reaction Hydrogen oxidation reaction Ruthenium Water splitting Fuel cell

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