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作者： Setswalo, K. Oladijo, O.P. Namoshe, M. Siengchin, S. Sanjay, M.R. Department of Mechanical Energy and Industrial Engineering Botswana International University of Science and Technology Palapye Botswana Department of Chemcial Materials and Metallurgical Engineering Botswana International University of Science and Technology Palapye Botswana Natural Composites Research Group Lab Department of Materials and Production Engineering King Mongkut's University of Technology North Banmkok Bangkok Thailand

This work is focused on finding an ecological and economic soaking duration suitable for natural fibers, and in the process obtaining the best possible mukwa wood fibers for manufacturing polymeric composites. Waste mukwa wood fibers found in the semi-arid conditions of Botswana were subjected to 5 wt% NaOH at soaking durations of 1.5 h, 2.5 h, 4 h, 8 h, 12 h, and 24 h. The effect of soaking duration and alkaline treatment on the chemical components, crystallinity, surface morphology, character of molecular bonds, and thermal stability were studied through weight loss, chemical composition, scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscope (FTIR) and Thermogravimetric analysis (TGA) respectively. The results of this study found the 2.5 h soaking duration to be more economic, time saving, and effective in modifying mukwa wood fibers. © 2022

关键词： Thermodynamic stability

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Efficient Perovskite quantum dots Light Emitting Diodes

Efficient Perovskite quantum dots Light Emitting Diodes

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International Conference on Display Technology, 2024

作者： Deng, Ming Li, Yanming Zhang, Xuanyu Xiang, Chaoyu Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo Zhejiang 315211 China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and Engineering Hangzhou Bay Campus Chinese Academy of Sciences Zhejiang Ningbo315300 China Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Ningbo315201 China Department of Mechanical Materials and Manufacturing Engineering University of Nottingham Ningbo China Zhejiang Ningbo315100 China

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Strain-enhanced dynamic regulation of chiroptical responses in 3D suspended nested metamaterials

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Optics Express 2025年第11期33卷 23440-23451页

作者： Li, Bo Duan, Shilong Zou, Qiushun Guo, Ruansheng Chen, Yimin Gu, Chenjie Zhang, Peiqing Shen, Xiang Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo315211 China Laboratory of Infrared Material and Devices Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices Advanced Technology Research Institute Ningbo University Zhejiang 315211 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Anhui Hefei230027 China

Three-dimensional (3D) chiral metamaterials, which exhibit strong chiroptical responses, have attracted tremendous attention in the broad fields of next-generation photonic devices and chiroptical spectroscopy techniques. There is an urgent need for a novel fabrication approach that enables the rapid and straightforward preparation of 3D chiral nanostructures, along with a robust strategy for achieving dynamic regulation. Here, we proposed a strain-enhanced strategy for dynamically regulating the chiroptical responses of 3D suspended nested metamaterials from the transformation of a 2D precursor. The local strain enhancement could effectively resolve the bottleneck of insufficient strain and low precision for the buckling strain self-assembly. The changing morphology and circular dichroism (CD) of 3D suspended chiral metamaterials were analyzed under the impact of a strain-enhanced effect. Then, the uplifted heights of these 3D nanostructures increased with the substrate’s pre-strain (Εpre). Its CD reached up to 0.79, mainly resulting from ring electric dipoles. Interestingly, the chiroptical responses of 3D nanopyramids were regulated dynamically by controlling the substrate’s pre-strain. Such a strategy provides a new pathway for achieving high-performance chiral metamaterials and offers promising applications in circularly polarized light detection, super-chiral light sources, optical communication, and advanced nanophotonic systems. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Metamaterials

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Additive Manufacturing for Sustainable Production: A Survey on Titanium Alloys

Additive Manufacturing for Sustainable Production: A Survey ...

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2024 International Conference on science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Onu, Peter Gad, Shedrach Musa Adediran, Adeolu A. Mbohwa, Charles Landmark University Department of Mechanical Engineering Omu-Aran Nigeria University of South Africa College of Science Engineering and Technology Florida Johannesburg South Africa University of Manchester Corrossion and Protection Centre School of Materials Manchester United Kingdom

ISBN: (纸本)9798350358155

The high cost of manufacturing intricate machine components, as per high-profile engineering applications, has hindered the widespread adoption of titanium alloys. These alloys pose challenges in terms of geometrical qualities, energy consumption, and the risk of material failure. In contrast, additive manufacturing (AM) technology offers a more adaptable and superior alternative to traditional production methods, simplifying the fabrication of titanium. This article explores the potential of AM for long-term industrial manufacturing. It delineates the benefits it can bring to small and medium enterprises (SMEs) in developing economies, enabling them to compete in high-end titanium/product manufacturing. It emphasizes the potential of additive manufacturing for metal production and the various processes that can replace existing manufacturing methods. The paper discusses the microstructure, characteristics, and economic advantages of titanium alloys produced from AM processes. The study examines the current knowledge regarding the challenges and prospects of AM-fabricated titanium-based alloys. As a result, it provides valuable insights and recommendations for academics and other individuals interested in researching and utilizing the metal AM method for producing/manufacturing components. © 2024 IEEE.

关键词： Cost engineering

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Injectable and rapidly expandable thrombin-decorated cryogels achieve rapid hemostasis and high survival rates in a swine model of lethal junctional hemorrhage

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Bioactive materials 2024年第8期38卷 154-168页

作者： Syed Muntazir Andrabi S.M.Shatil Shahriar Al-Murtadha Al-Gahmi Benjamin L.Wilczewski Mark A.Carlson Jingwei Xie Department of Surgery-Transplant and Mary&Dick Holland Regenerative Medicine Program University of Nebraska Medical CenterOmahaNE68198USA Departments of Surgery-General Surgery and Genetics Cell Biology and AnatomyUniversity of Nebraska Medical CenterOmahaNE68198USA Department of Mechanical and Materials Engineering University of Nebraska LincolnLincolnNE68588USA

Effective therapies are urgently needed to stabilize patients with marginally compressible junctional hemorrhage long enough to get them to the hospital ***,we report injectable and rapidly expandable cryogels consisting of polyacrylamide and thrombin(AT cryogels)created by cryo-polymerization for the efficient management of lethal junctional hemorrhage in *** produced cryogels have small pore sizes and highly interconnected porous architecture with robust mechanical *** cryogels exhibit rapid shape memory properties and prove to be resilient against *** cryogels also show high water/blood absorption capacity,fast blood clotting effect,and enhanced adhesion of red blood cells and platelets in ***,in vivo,hemostatic efficacy tests in a lethal swine junctional hemorrhage model suggest that treatment with AT cryogels,especially AT-2 cryogels,achieves the least blood loss and the highest survival rate(100%)compared to currently employed products such as XStat®and combat *** high hemostatic performance of the cryogels may be attributed to highly interconnected porous architecture with small pore size and the use of thrombin as a pro-coagulant ***,injectable and rapidly expandable thrombin-decorated polyacrylamide-based cryogels show significant promise as hemostatic material,offering effective management of marginally compressible junctional hemorrhages in prehospital settings.

关键词： Polyacrylamide cryogels Blood clotting Shape memory and injectable Lethal junctional hemorrhage

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Magneto-optical Kerr spectra of gold induced by spin accumulation

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Physical Review B 2022年第1期106卷 014410-014410页

作者： Víctor H. Ortiz Sinisa Coh Richard B. Wilson Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside 92521 CA United States

We report the magneto-optic Kerr effect (MOKE) angle of Au magnetically excited by spin accumulation. We perform time-resolved polar MOKE measurements on Au/Co heterostructures. In our experiment, the ultrafast optical excitation of the Co drives spin accumulation into an adjacent Au layer. The spin accumulation, together with spin-orbit coupling, leads to nonzero terms in the off-diagonal conductivity tensor of Au, which we measure by recording the polarization and ellipticity of light reflected from the Au surface for photon energies between 1.3 and 3.1 eV. In a narrow energy range near the interband transition threshold of Au, the sensitivity to magnetization measured exceeds 1μradperA/m. In the photon energy interval of 0.6–4.4 eV, the maximum value for transition ferromagnetic metals like Ni are <10nradperA/m, while predicted values for heavy metals like Pt or W are <13nradperA/m. The exceptional sensitivity of the optical properties of Au to spin magnetic moments make Au an exceptionally sensitive optical magnetometer, with potential applications in the development of optospintronic technologies.

关键词： Density of states Magneto-optical Kerr effect Spin accumulation Ultrafast magnetic effects

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Microstructural and textural gradients in SLM-manufactured AlSi10Mg after low-draught cold-rolling and heat treatment 8

Microstructural and textural gradients in SLM-manufactured A...

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8th International Conference on Recrystallization and Grain Growth, Rex and GG 2023

作者： Liao, Z. Zhang, L. Huang, X. Jensen, D. Juul College of Materials Science and Engineering Chongqing University Chongqing400045 China Shenyang National Laboratory for Materials Science Chongqing University Chongqing400044 China Department of Civil and Mechanical Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark

Additively manufactured AlSi10Mg is often subject to a two-stage heat treatment, namely solid solution treatment followed by artificial aging, to achieve optimal properties. Before such heat treatments, slight surface plastic deformation may be applied to modify the surface quality and properties. However, gradients in microstructure and texture near the surface introduced by the plastic deformation may cause undesired microstructural and textural evolutions during subsequent heat treatment. In this work, we introduce plastic deformation in the surface layer in an SLM-manufactured AlSi10Mg sample by relatively low-draught cold rolling and we investigate the through-thickness variations in microstructure and texture in the deformed state and after heat treatment. The SLM-manufactured AlSi10Mg sample has a fine-scale microstructure and a weak texture, and is rather thermally stable during subsequent heat treatments. Applying 10% low-draught cold rolling to the SLM-manufactured AlSi10Mg sample is found to introduce a near Goss texture in the surface layer, while little change is observed in the center layer. After subsequent solution treatment and aging, abnormal grain growth occurred in the surface layer resulting in remarkable through thickness gradients in microstructure and texture. © Published under licence by IOP Publishing Ltd.

关键词： Heat treatment

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Experimental and process modelling of chemical composition and thermal ageing of Ti-doped cast Cu-Ni alloy for microstructural, conductivity, and mechanical properties

Journal of Alloys and Metallurgical Systems

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Journal of Alloys and Metallurgical Systems 2025年 9卷

作者： Okechukwu, Cynthia C. Edoziuno, Francis O. Adediran, Adeolu A. Okuma, Silas O. Okoubulu, Augustine B. Department of Mechanical Engineering Nigeria Maritime University Delta State Okerenkoko Nigeria Department of Metallurgical and Materials Engineering Nnamdi Azikiwe University Awka Nigeria Department of Mechanical Engineering Landmark University Kwara State Omu-Aran Nigeria Department of Mechanical Engineering Science University of Johannesburg South Africa Department of Materials and Metallurgical Engineering Delta State University of Science and Technology Delta State Ozoro Nigeria

This study investigates the effects of titanium (Ti) content and thermal aging on the mechanical properties, microstructure, and electrical conductivity of Ti-doped Cu-10Ni alloy. Both as-cast and heat-treated alloys were subjected to comprehensive mechanical testing, electrical conductivity measurements, and microstructural analysis. A response surface methodology (RSM) was employed for statistical analysis, predictive modeling, and optimization, with Ti concentration (0.1–3.5 wt%) and aging temperature (400°C–500°C) as the independent variables, and tensile strength, elongation, hardness, impact strength, and electrical conductivity as response variables. The results indicate that Ti addition, particularly in the range of 1.5–3.5 wt%, refined the as-cast microstructure of Cu-10Ni alloys, leading to modest improvements in mechanical properties compared to the base alloy. Aging treatments promoted the formation of precipitates and second phases, notably β-Ni₃Ti, β-Ti₂, and δ-Ti₂Ni, which contributed significantly to property enhancement. The alloy's ultimate tensile strength (UTS) reached 659 MPa with 2.5 wt% Ti aged at 500°C for 2 h. At 3.5 wt% Ti and 450°C aging, the alloy exhibited the highest values for elongation (24.23 %), hardness (193.4 BHN), and impact strength (157 J). Electrical conductivity also improved across all Ti concentrations after aging, with conductivity increasing with higher aging temperatures, though the rate of increase diminished as Ti content rose. Statistical analysis demonstrated good agreement between experimental and predicted values, with the regression models being statistically significant (p © 2024 The Authors

关键词： Tensile strength

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Towards superior lithium-sulfur batteries with metal-organic frameworks and their derivatives

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Tungsten 2022年第4期4卷 269-283页

作者： Ning Yuan Yi-Rui Deng Shan-Hu Wang Li Gao Jin-Lin Yang Na-Chuan Zou Bing-Xin Liu Jun-Qing Zhang Rui-Ping Liu Lei Zhang School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing100083China School of Mechanical Engineering Qinghai UniversityXining810016China School of Materials Science and Engineering Tsinghua UniversityBeijing100083China Department of Mechanical Engineering University of Alaska FairbanksFairbanksAK99775-5905USA

Lithium-sulfur batteries(LSBs)are one of the most promising energy storage devices in the future due to their high theoretical specific capacity(1675 mA·h·g^(-1))and energy density(2600 W·h·kg^(-1)).However,the severe capacity decay caused by the shuttle effect of polysulfides needs to be addressed before the practical ***-organic frameworks(MOFs)and their derivatives are known for their large specific surface area,high porosity,abundant functional groups,and good chemical ***,they have been widely investigated in *** review introduces the principles of the LSBs and origination of the shuttle effect first summarizes various methods of limiting polysulfide diffusion by MOFs and their derivatives both in cathodes and separators,and provides an in-depth discussion of the immobilization mechanisms,which helps to understand the advantages and disadvantages of each *** mechanisms,such as structure and pore size tuning,chemical absorption,and catalytic conversion,are ***,based on the method of MOFs and their derivatives to inhibit the diffusion of polysulfides,the application prospect of MOFs and their derivatives in LSBs technology are proposed.

关键词： Metal-organic frameworks Lithium-sulfur batteries Cathode Separator Shuttle effect

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Fused-ring induced end-on orientation in conjugated molecular dyads toward efficient single-component organic solar cells

Aggregate

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Aggregate 2023年第2期4卷 291-299页

作者： Dongdong Xia Shengxi Zhou Wen Liang Tan Safakath Karuthedath Chengyi Xiao Chaowei Zhao Frédéric Laquai Christopher R.McNeill Weiwei Li Institute of Applied Chemistry Jiangxi Academy of SciencesNanchangChina Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijingChina Department of Materials Science and Engineering Monash UniversityClaytonAustralia KAUST Solar Center(KSC) Physical Sciences and Engineering Division(PSE)Material Science and Engineering Program(MSE)King Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia

The molecular orientations of conjugated materials on the substrate mainly include edge-on,face-on,and ***-on and face-on orientations have been widely observed,while end-on orientation has been rarely *** in organic solar cells(OSCs)charge transport is along the vertical direction,end-on orientation with conjugated backbones perpendicular to the substrate is recognized as the ideal microstructure for *** this work,we for the first time obtained the preferential end-on orientation in a conjugated molecular dyad that contains a conjugated backbone as donor and perylene bisimide side units as *** was realized by introducing a fused-ring structure to replace linear terthiophenes with conjugated backbones,yielding F-MDPBI and L-MDPBI ***,a shifting trend of the molecular orientation from dominating edge-on in L-MDPBI to preferential end-on in F-MDPBI was *** a consequence,vertical charge carrier mobilities in F-MDPBI are one order of magnitude higher than those with preferential edge-on orientation,so single-component OSCs based on this molecular dyad as a single photoactive layer provided a power conversion efficiency of 4.89% compared to 1.70% based on L-MDPBI with preferential edge-on orientation.

关键词： conjugated molecular dyads crystallinity edge-on end-on single-component organic solar cells

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