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Computational analysis of physico-mechanical properties of cotton fibers using elastic tensor analysis tool

Nuclear and Particle Physics Proceedings 2023年 336-338卷 51-53页

作者： Manju, V.V. Somashekar, R. Department of Physics Vidyavardhaka college of Engineering Mysuru 570002 India Center for Material science University of Mysore Vijnana Bhavan Mysuru 570006 India

The harm that has been caused to the climate because of the broad usage of synthetic materials has incited the improvement and use of natural fiber materials. This study is an endeavor to investigate the underlying physico-mechanical properties of few cotton fibers which are cultivated across India, USA, and Ukraine. Powder X-ray diffraction data of considered fibers were acquired and utilized along with statistical tools to get their physico-mechanical properties. The chosen materials belong to monoclinic unit cell with lattice parameters a=7.350 Å, b=8.220 Å, c=10.370 Å and β=96.28°. The XRD has been refined using FullProf software package and obtained the crystallographic information file. Trealor's principle has been employed to obtain the 6×6 elastic constants for a monoclinic crystal system. These elastic constants were employed to open-source Elastic Tensor Analysis Tool (ELATE) and spatial dependence of elastic moduli were plotted and observed that, the USA cotton has significant mechanical properties compared to Indian and Ukraine cotton. This method can be extended to any material of interest to compute the physico-mechanical properties. © 2023 Elsevier B.V.

关键词： Cotton ELATE Ordered region PXRD Young's modulus

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Water-soluble Cu30 nanoclusters as a click chemistry catalyst for living cell labeling via azide-alkyne cycloaddition

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Nano Research 2023年第1期16卷 1748-1754页

作者： Ge Yang Yali Xie Yaru Wang Ying Tang Leng Leng Chng Fuyi Jiang Fanglin Du Xianfeng Zhou Jackie Y.Ying Xun Yuan School of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Key Lab of Biobased Polymer Materials of Shandong Provincial Education Department School of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China NanoBio Lab Institute of Materials Research and Engineering(IMRE)Agency for ScienceTechnology and Research(A*STAR)31 Biopolis WayThe NanosSingapore 138669Singapore School of Environment and Material Engineering Yantai UniversityYantai 264005China NanoBio Lab A*STAR Infectious Diseases LabsA*STAR31 Biopolis WayThe NanosSingapore 138669Singapore

Cu(I)-catalyzed azide-alkyne cycloadditions(CuAAC)have gained increasing interest in the selective labeling of living cells and organisms with ***,their application is constrained either by the high cytotoxicity of Cu(I)ions or the low activity of CuAAC in the internal space of living *** paper reports the design of a novel Cu-based nanocatalyst,watersoluble thiolated Cu30 nanoclusters(NCs),for living cell labeling via *** Cu30 NCs offer good biocompatibility,excellent stability,and scalable synthesis(e.g.,gram scale),which would facilitate potential commercial *** combining the highly localized Cu(I)active species on the NC surface and good structural stability,the Cu30 NCs exhibit superior catalytic activities for a series of Huisgen cycloaddition reactions with good *** importantly,the biocompatibility of the Cu30 NCs enables them to be a good catalyst for CuAAC,whereby the challenging labeling of living cells can be achieved via CuAAC on the cell *** study sheds light on the facile synthesis of atomically precise Cu NCs,as well as the design of novel Cu NCs-based nanocatalysts for CuAAC in intracellular bioorthogonal applications.

关键词： Cu nanocluster click chemistry catalysis azide-alkyne cycloaddition living cell labeling

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Precipitation and coarsening kinetics of H-phase in NiTiHf high temperature shape memory alloy

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Journal of materials science & Technology 2022年第19期114卷 90-101页

作者： A.Shuitcev Y.Ren B.Sun G.V.Markova L.Li Y.X.Tong Y.F.Zheng Institute of Materials Processing and Intelligent Manufacturing College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Center of Testing and Analysis College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Physics of Metal and Material Science Department Tula State UniversityTula 300012Russian Federation School of Materials Science and Engineering Peking UniversityBeijing 100871China

Precipitate hardening is the most easiest and effective way to enhance strain recovery properties in NiTiHf high-temperature shape memory *** paper discusses the precipitation,coarsening and age hardening of H-phase precipitates in Ni_(50)Ti_(30)Hf_(20)alloy during isothermal aging at temperatures between 450℃and 650℃for time to 75 *** H-phase mean size and volume fraction were determined using transmission electron *** kinetics was analyzed using the Johnson-Mehl-Avrami-Kolmogorov equation and an Arrhenius type *** these analyses,a Time-Temperature-Transformation diagram was *** evolution of H-phase size suggests classical matrix diffusion limited Lifshitz-Slyozov-Wagner coarsening for all considered *** coarsening rate constants of H-phase precipitation have been determined using a modified coarsening rate equation for nondilute *** size of H-phase precipitates for breaking down the precipitate/matrix interface coherency was estimated through a combination of age hardening and precipitate size evolution ***,time-temperature-hardness diagram was constructed from the precipitation and coarsening kinetics and age hardening of H-phase precipitates in Ni_(50)Ti_(30)Hf_(20)alloy.

关键词： High temperature shape memory alloys NiTiHf Time-temperature-transformation diagram Coarsening kinetics H-phase

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Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba_(3)Cu_(5)O_(8) (1:1.3) and YbBa_(2)Cu_(3)O_(y)

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International Journal of Minerals,Metallurgy and materials 2021年第6期28卷 1048-1056页

作者： Sushma Miryala Masato Murakami Superconducting Material Laboratory Department of Material Science and EngineeringShibaura Institute of Technology3-7-5 ToyosuKoto-kuTokyo 135-8546Japan School of Engineering and Applied Science Princeton UniversityPrincetonNJ 08544United States

Utilization of novel materials,particularly high-T_(c)(critical temperature)superconductors,is essential to pursue the United Nations’Sustainable Goals,as well as to meet the increasing worldwide demand for clean and carbon-free electric power *** magnets are beneficial in several real-life applications including transportation,energy production,magnetic resonance imaging(MRI),and drug delivery *** achieve high performance,one must develop uniform,large-grain,infiltration-growth(IG)processed bulk YBa_(2)Cu_(3)O_(y)(Y-123)*** this study,we report the magnetic and microstructural properties of a large-grain,top-seeded,IG-processed Y-123 pellet,which is 20 mm in diameter and 6 mm in height;the pellet is produced utilizing liquid Yb-123+Ba_(3)Cu_(5)O_(8) as the liquid *** the samples cut from the top of the bulk exhibit a sharp superconducting transition(approximately 1 K wide)with the onset T_(c) of approximately 90 ***,in the samples cut from the bottom surface,the onset T_(c) values slightly decreased to between 88 and 90 K,although still exhibiting a sharp superconducting *** top and bottom samples exhibited the highest remnant value of J_(c)(critical current density)at 77 K H//c-axis of 50 and 55 kA/cm^(2),*** remnant J_(c) and irreversibility field values significantly fluctuated,being fairly low in some bottom *** electron microscopy identified nanometer size Y-211(Y2BaCuO5)secondary-phase particles dispersed in the Y-123 ***-dispersive spectroscopy clarified that the decreased both T_(c) and J_(c) for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.

关键词： infiltration growth special variation critical current density scanning electron microscopy

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Polyethylene glycol/polylactic acid block co‐polymers as solid–solid phase change materials

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SmartMat 2023年第3期4卷 108-119页

作者： Xiang YDSoo Joseph K.Muiruri Jayven CCYeo Zhuang MPng Anqi Sng Huiqing Xie Rong Ji Suxi Wang Hongfei Liu Jianwei Xu Xian JLoh Qingyu Yan Zibiao Li Qiang Zhu Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)Singapore Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)Singapore Department of Chemistry National University of SingaporeSingapore Department of Material Science and Engineering National University of SingaporeSingapore School of Materials Science and Engineering Nanyang Technological UniversitySingapore School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore

Phase change materials(PCMs)are promising thermal energy storage materials due to their high specific latent *** PCMs typically exploit the solid–liquid(s–l)***,leakage and leaching are common issues for solid–liquid PCMs,which have to be addressed before usage in practical *** contrast,solid–solid(s–s)PCMs would naturally overcome these issues due to their inherent form stability and *** this study,we report a new type of s–s PCM based on chemically linked polyethylene glycol(PEG,the PCM portion)with polylactic acid(PLA,the support portion)in the form of a block co‐***‐solid latent heat of up to 56 J/g could be achieved,with melting points of between 44°C and 55°*** comparison,PEG was physically mixed into a PLA matrix to form a PEG:PLA ***,the composite material saw leakage of up to 9%upon heating,with a corresponding loss in thermal storage *** contrast,the mPEG/PLA block co‐polymers were found to be completely homogeneous and thermally stable even when heated above its phase transition temperature,with no observable leakage,demonstrating the superiority of chemical linking strategies in ensuring form stability.

关键词： block co‐polymer chemically linked form‐stable phase change material(PCM),polyethylene glycol(PEG) polylactic acid(PLA) solid–solid transition

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Tailoring topological corner states in photonic crystals by near-and far-field coupling effects

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Chinese Physics B 2023年第12期32卷 318-324页

作者：张兆健兰智豪陈欢于洋杨俊波 Department of Physics National University of Defense TechnologyChangsha 410073China Center of Material Science National University of Defense TechnologyChangsha 410073China Department of Electronic and Electrical Engineering University College LondonLondon WC1E 7JEUnited Kingdom

We explore the behaviors of optically coupled topological corner states in supercell arrays composed of photonic crystal rods,where each supercell is a second-order topological *** findings indicate that the coupled corner states possess nondegenerate eigenfrequencies at theΓpoint,with coupled dipole corner states excited resonantly by incident plane waves and displaying a polarization-independent *** resonance properties of coupled dipole corner states can be effectively modulated via evanescently near-field coupling,while multipole decomposition shows that they are primarily dominated by electric quadrupole moment and magnetic dipole ***,we demonstrate that these coupled corner states can form surface lattice resonances driven by diffractively far-field coupling,leading to a dramatic increase in the quality *** work introduces more optical approaches to tailoring photonic topological states,and holds potential applications in mid-infrared topological micro-nano devices.

关键词： topological corner states photonic crystal slabs optical coupling effects surface lattice resonances

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Investigation of Electronic, Elastic and Dynamic Properties of AgNbO₃ and AgTaO₃ under Pressure: Ab Initio Calculation

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World Journal of Condensed Matter Physics 2023年第2期13卷 57-77页

作者： Sevket Simsek Department of Material Science and Engineering Faculty of Engineering Hakkari University Hakkari Turkey

Based on the density functional theory within the local density approximation (LDA), we studied the electronic, elastic, and dynamic properties of AgNbO3 and AgTaO3 compounds under pressure. The elastic constants, opt... 详细信息

Based on the density functional theory within the local density approximation (LDA), we studied the electronic, elastic, and dynamic properties of AgNbO₃ and AgTaO₃ compounds under pressure. The elastic constants, optic and static dielectric constants, born effective charges, and dynamic properties of AgNbO₃ and AgTaO₃ in cubic phase were studied as pressure dependences with the ab initio method. For these compounds, we have also calculated the bulk modulus, Young’s modulus, shear modulus, Vickers hardness, Poisson’s ratio, anisotropy factor, sound velocities, and Debye temperature from the obtained elastic constants. In addition, the brittleness and ductility properties of these compounds were estimated from Poisson’s ratio and Pugh’s rule (G/B). Our calculated values also show that AgNbO₃ (0.37) and AgTaO₃ (0.39) behave as ductile materials and steer away from brittleness by increasing pressure. The calculated values of Vicker hardness for both compounds indicate that they are soft materials. The results show that band gaps, elastic constants, elastic modules, and dynamic properties for both compounds are sensitive to pressure changes. We have also made some comparisons with related experimental and theoretical data that is available in the literature.

关键词： Electronic Structure Elastic Constants Born Effective Charges Dynamic Properties AgNbO3 AgTaO3

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Transparent Josephson junctions in higher-order topological insulator WTe2 via Pd diffusion

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Physical Review materials 2022年第8期6卷 L081201-L081201页

作者： Martin Endres Artem Kononov Michael Stiefel Marcus Wyss Hasitha Suriya Arachchige Jiaqiang Yan David Mandrus Kenji Watanabe Takashi Taniguchi Christian Schönenberger Department of Physics University of Basel Klingelbergstrasse 82 4056 Basel Switzerland Laboratory for Nanoscale Material Science Swiss Federal Laboratories for Material Science and Technology EMPA Überlandstrasse 129 8600 Dübendorf Switzerland Swiss Nanoscience Institute University of Basel Klingelbergstrasse 82 4056 Basel Switzerland Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Material Science and Technology Division Oak Ridge Laboratory Oak Ridge Tennessee 37831 USA Department of Materials Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Highly transparent superconducting contacts to a topological insulator (TI) remain a persistent challenge on the route to engineer topological superconductivity. Recently, the higher-order TI WTe2 was shown to turn superconducting when placed on palladium (Pd) bottom contacts, demonstrating a promising material system in pursuing this goal. Here, we report the diffusion of Pd into WTe2 and the formation of superconducting PdTex as the origin of observed superconductivity. We find an atomically sharp interface in the direction vertical to the van der Waals layers between the diffusion crystal and its host crystal, forming state-of-the-art superconducting contacts to a TI. The diffusion is discovered to be nonuniform along the width of the WTe2 crystal, with a greater extent along the edges compared to the bulk. The potential of this contacting method is highlighted in transport measurements on Josephson junctions by employing external superconducting leads.

关键词： Josephson effect Proximity effect Superconductivity Surface diffusion Topological insulators Van der Waals systems

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Layer-Wise Melt Pool Temperature Evolution in Laser Powder Bed Fusion: An Experimental Study Using A Single Camera Based Twowavelength Imaging Pyrometry 17

Layer-Wise Melt Pool Temperature Evolution in Laser Powder B...

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ASME 2022 17th International Manufacturing science and engineering Conference, MSEC 2022

作者： Vallabh, Chaitanya Krishna Prasad Hinnebusch, Shawn To, Albert C. Zhao, Xiayun Department of Mechanical Engineering and Material Science University of Pittsburgh PittsburghPA United States

ISBN: (纸本)9780791885819

In metal additive manufacturing (AM) the layer-wise thermal history is crucial for its effect on the print part properties, such as, microstructure, porosity, and mechanical strength. Literature studies for evaluating the part thermal history are typically based on in-situ infrared thermography and thermal modeling. However, the effect of melt pool temperature on the part thermal history has not been widely studied. In this preliminary work, for the first time we present a large and comprehensive in-situ monitored, layer-wise melt pool temperature evolution data for laser powder bed fusion (LPBF) AM. The melt pool temperature is evaluated using an in-house Single Camera Two-Wavelength Imaging Pyrometry (STWIP) system. The melt pool temperature evolution was evaluated for three different prints with different inter-layer-Times and print heights. The melt pool temperature history trends presented in this work are in agreement with literature studies on partthermal histories. The LPBF process signatures from our STWIP system can help develop more accurate thermal models with the melt pool temperature as the input and the unique capability of the STWIP system to acquire and analyze large amounts data facilitates the development of machine learning models for estimating part properties based on the process signatures. © Proceedings of ASME 2022 17th International Manufacturing science and engineering Conference, MSEC 2022.

关键词： Pyrometry

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Oxidation-induced superelasticity in metallic glass nanotubes

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Nature materials 2024年第1期23卷 52-57页

作者： Li, Fucheng Zhang, Zhibo Liu, Huanrong Zhu, Wenqing Wang, Tianyu Park, Minhyuk Zhang, Jingyang Bönninghoff, Niklas Feng, Xiaobin Zhang, Hongti Luan, Junhua Wang, Jianguo Liu, Xiaodi Chang, Tinghao Chu, Jinn P. Lu, Yang Liu, Yanhui Guan, Pengfei Yang, Yong Department of Mechanical Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong Institute of Physics Chinese Academy of Sciences Beijing China Songshan Lake Materials Laboratory Dongguan China Beijing Computational Science Research Center Beijing China Department of Material Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Materials Science and Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong College of Mechatronics and Control Engineering Shenzhen University Shenzhen China Department of Mechanical Engineering The University of Hong Kong Pok Fu Lam Hong Kong Department of System Engineering College of Engineering City University of Hong Kong Kowloon Tong Hong Kong

Although metallic nanostructures have been attracting tremendous research interest in nanoscience and nanotechnologies, it is known that environmental attacks, such as surface oxidation, can easily initiate cracking on the surface of metals, thus deteriorating their overall functional/structural properties 1–3. In sharp contrast, here we report that severely oxidized metallic glass nanotubes can attain an ultrahigh recoverable elastic strain of up to ~14% at room temperature, which outperform bulk metallic glasses, metallic glass nanowires and many other superelastic metals hitherto reported. Through in situ experiments and atomistic simulations, we reveal that the physical mechanisms underpinning the observed superelasticity can be attributed to the formation of a percolating oxide network in metallic glass nanotubes, which not only restricts atomic-scale plastic events during loading but also leads to the recovery of elastic rigidity on unloading. Our discovery implies that oxidation in low-dimensional metallic glasses can result in unique properties for applications in nanodevices. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Metallic glass

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