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Optimising degradation and mechanical performance of additively manufactured biodegradable Fe–Mn scaffolds using design strategies based on triply periodic minimal surfaces

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Smart materials in Medicine 2024年第1期5卷 127-139页

作者： Dargusch, Matthew S. Soro, Nicolas Demir, Ali Gokhan Venezuela, Jeffrey Sun, Qiang Wang, Yuan Abdal-hay, Abdalla Alali, Aya Q. Ivanovski, Saso Previtali, Barbara Kent, Damon School of Mechanical and Mining Engineering The University of Queensland Advanced Engineering Building Bld 49 Staff House Rd St LuciaQLD4072 Australia Department of Mechanical Engineering Politecnico di Milano Via La Masa 1 Milan20156 Italy School of Dentistry The University of Queensland Herston Campus 4072 Australia Department of Engineering Materials and Mechanical Design Faculty of Engineering South Valley University Qena83523 Egypt Faculty of Industry and Energy Technology Mechatronics Technology Program New Cairo Technological University New Cairo - Fifth Settlement Cairo11835 Egypt School of Science Technology and Engineering University of the Sunshine Coast Maroochydore BCQLD4558 Australia

Additively manufactured lattices based on triply periodic minimal surfaces (TPMS) have attracted significant research interest from the medical industry due to their good mechanical and biomorphic properties. However, most studies have focussed on permanent metallic implants, while very little work has been undertaken on manufacturing biodegradable metal lattices. In this study, the mechanical properties and in vitro corrosion of selective laser melted Fe–35%Mn lattices based on gyroid, diamond and Schwarz primitive unit-cells were comprehensively evaluated to investigate the relationships between lattice type and implant performance. The gyroid-based lattices were the most readily processable scaffold design for controllable porosity and matching the CAD design. Mechanical properties were influenced by lattice geometry and pore volume. The Schwarz lattices were stronger and stiffer than other designs with the 42% porosity scaffold exhibiting the highest combination of strength and ductility, while diamond and gyroid based scaffolds had lower strength and stiffness and were more plastically compliant. The corrosion behaviour was strongly influenced by porosity, and moderately influenced by geometry and geometry-porosity interaction. At 60% porosity, the diamond lattice displayed the highest degradation rate due to an inherently high surface area-to-volume ratio. The biodegradable Fe–35Mn porous scaffolds showed a good cytocompatibility to primary human osteoblasts cells. Additive manufacturing of biodegradable Fe–Mn alloys employing TPMS lattice designs is a viable approach to optimise and customise the mechanical properties and degradation response of resorbable implants toward specific clinical applications for hard tissue orthopaedic repair. © 2023 The Authors

关键词： Porosity

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The growing memristor industry

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Nature 2025年第8059期640卷 613-622页

作者： Lanza, Mario Pazos, Sebastian Aguirre, Fernando Sebastian, Abu Le Gallo, Manuel Alam, Syed M. Ikegawa, Sumio Yang, J. Joshua Vianello, Elisa Chang, Meng-Fan Molas, Gabriel Naveh, Ishai Ielmini, Daniele Liu, Ming Roldan, Juan B. Department of Materials Science and Engineering National University of Singapore Singapore Singapore Institute for Functional Intelligent Materials National University of Singapore Singapore Singapore Centre for Advanced 2D Materials (CA2DM) National University of Singapore Singapore Singapore Materials Science and Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia Intrinsic Semiconductor Technologies London United Kingdom IBM Research – Zurich Rüschlikon Switzerland Everspin Technologies Chandler AZ United States Department of Electrical and Computer Engineering University of Southern California Los Angeles CA United States CEA-Leti Université Grenoble Alpes Grenoble France Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan Weebit Nano Hod Hasharon Israel Dipartimento di Elettronica Informazione e Bioingegneria (DEIB) Politecnico di Milano and *** Milano Italy Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing China Departamento de Electrónica y Tecnología de Computadores Universidad de Granada Facultad de Ciencias Granada Spain

The semiconductor industry is experiencing an accelerated transformation to overcome the scaling limits of the transistor and to adapt to new requirements in terms of data storage and computation, especially driven by artificial intelligence applications and the Internet of Things. In this process, new materials, devices, integration strategies and system architectures are being developed and optimized. Among them, memristive devices and circuits—memristors are two-terminal memory devices that can also mimic some basic bioelectronic functions—offer a potential approach to create more compact, energy-efficient or better-performing systems. The memristor industry is growing quickly, raising abundant capital investment, creating new jobs and placing advanced products in the market. Here we analyse the status and prospects of the memristor industry, focusing on memristor-based products that are already commercially available, prototypes with a high technological readiness level that might affect the market in the near future, and discuss obstacles and pathways to their implementation. © Springer Nature Limited 2025.

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Fabrication of Zn-Ni Alloy Columns with Low Hydrogen Evolution Overpotential as Efficient Electrocatalyst for H2 Production

Fabrication of Zn-Ni Alloy Columns with Low Hydrogen Evoluti...

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IEEE Conference on Nanotechnology

作者： Yao-Tien Tseng Russell Clemente Jing-Chie Lin Institute of Materials Science and Engineering National Central University Taoyuan Taiwan International Master Program in Applied Materials Science National Central University Taoyuan Taiwan

In this study, steric Zn-Ni alloy columns were fabricated via microanode-guided electroplating (MAGE), which had a very small electrode gap (90 µm) and a very high deposition rate (> 2 µm/min). These microcolumns were used to produce hydrogen by the electrocatalytic decomposition of water in alkaline aqueous solutions of 1 M KOH. The surface morphology study was acquired via the SEM, and after numerous electrocatalytic reactions, the porous structure of the Zn-Ni alloy progressively developed on the surface. The amount of zinc present in the alloy fell from 91 at. % to 52 at. %, which resulted in the column diameter of Zn-Ni increasing from 248 to 300 µm. After conducting an XRD investigation, the primary structure of the Zn-Ni alloy microcolumn was determined to be that of an intermetallic compound belonging to the Zn-Ni series. The phases shifted from Ni 3 Zn 22 to Ni 2 Zn 11 and NiZn 3 when the percentage of zinc in the alloy decreased from 91 to 52 at. %. The results of the linear sweep voltammetry showed that the Zn-Ni alloy microcolumns exhibited good hydrogen production efficiency at 13–24 at.% Ni, the lowest Tafel slope of 45 mV/dec, and only 36 mV overpotential when operating at 10 mA/cm 2 current density. Because of the enormous number of nano-networked nickel hydroxide on the surface that was investigated by TEM, the excellent efficiency with which hydrogen was produced can be attributed to the fact that this resulted in a significant increase in the amount of electrochemical surface area available.

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Vibrational entropies of oxygen vacancy formation in metal oxides

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Physical Review materials 2024年第5期8卷 055407-055407页

作者： Bianca Baldassarri Jiangang He Christopher Wolverton Graduate Program in Applied Physics Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA

Oxygen vacancies play a key role in many energy-related applications, and the investigation of the thermodynamic forces driving their formation across different materials can be tackled through the use of ab initio methods. In this context, however, computational studies targeting finite-temperature properties such as entropy remain scarce. Wider-ranging studies are of interest to deepen the understanding of the role of the entropy of oxygen vacancy formation and its different components in processes like the ones involved in solar thermochemical hydrogen (STCH) production, and to investigate the existence of common trends and differences between materials. In this work, we use density functional theory and harmonic phonon calculations to compute the vibrational entropy of oxygen vacancy formation (ΔSvib) for 10 different metal oxide compounds. The computation is carried out by taking the difference between the vibrational entropy of a vacancy-containing and a pristine structure, while the entropic contribution from the final gaseous state of the oxygen lost from the material is accounted for separately with a gas entropy term. We first examine the temperature dependence of ΔSvib and highlight the presence of an initial peak around room temperature, followed by a steady decrease resulting from the presence of an additional O atom (the one becoming vacant) in the defect-free structure. We then inspect the atomic contributions to ΔSvib, and highlight similarities and differences between compounds. Finally, we consider other significant sources of entropy, and find ΔSvib to provide a smaller, yet non-negligible, contribution to the total entropy of vacancy formation. We also compare the temperature dependence of ΔSvib to that of the gas entropy, and show that the two largely counterbalance each other at high temperatures.

关键词： Entropy Hydrogen production Density functional theory

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Scaled-up synthesis of defect-rich layered double hydroxide monolayers without organic species for efficient oxygen evolution reaction

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Green Energy & Environment 2022年第5期7卷 975-982页

作者： Haoyuan Chi Jingwen Dong Tian Li Sha Bai Ling Tan Jikang Wang Tianyang Shen Guihao Liu Lihong Liu Luyi Sun Yufei Zhao Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing100875China Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut06269USA Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

The scaled-up synthesis of organic-free monolayer nanomaterials is highly desirable,especially in obtaining green energy by *** this study,a method for the scaled-up synthesis of the series of monolayer layered double hydroxides(LDHs)without the addition of organic solvents is reported via the separate nucleation and aging steps *** resulting monolayer LDHs with the thicknesses of less than 1 nm showed a narrow thickness distribution.X-ray absorption fine-structure revealed that monolayer NiFe-LDH nanosheets have a number of oxygen and metal vacancies *** a practical application,monolayer NiFe-LDH nanosheets containing defects showed an enhanced electrocatalytic water oxidation activity compared with that of bulk *** functional theory calculations uncovered that excellent catalytic activity is attributed to vacancies *** proposed method is an economical and universally applicable strategy for the scaled-up production of monolayer LDHs.

关键词： process synthesis monolayer

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Designing a Novel Low-Density, High-Strength Ti27.5zr26.5nb25.5ta8.5al12 Refractory High-Entropy Alloy for High-Temperature Applications

SSRN

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SSRN 2024年

作者： Naseer, Hashim Wang, Yangwei Bao, Jiawei Khan, Muhammad Abubaker Afifi, Mohamed A. School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China Tangshan Research Institute Beijing Institute of Technology Tangshan063000 China Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Mechanical Engineering Program School of Engineering and Applied Sciences Nile University Giza12677 Egypt

This study introduces a novel Refractory High-Entropy Alloy (RHEA) with the composition Ti27.5Zr26.5Nb25.5Ta8.5Al12, designed for high-temperature structural applications while addressing the limitations of traditional nickel-based superalloys. The alloy was synthesized using vacuum arc melting and characterized through comprehensive experimental methods including X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). This RHEA demonstrated exceptional mechanical properties, achieving a yield strength of 1356 MPa and a specific yield strength of 197.3 MPa·g⁻¹·cm³ at room temperature, with notable ductility (compressive strain >50%) across a wide temperature range up to 1000°C. The microstructural analysis revealed a two-phase BCC/B2 nanodomain structure that contributes significantly to its strength and ductility. This structure was further refined through controlled thermomechanical treatments, eliminating the need for additional heat treatment. The findings suggest that the Ti27.5Zr26.5Nb25.5Ta8.5Al12 RHEA holds great potential as a low-density, high-performance material for demanding environments, offering a viable alternative to heavier superalloys. © 2024, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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Elevated Temperature Deposition of Metal (Nb, Ti) – Max (Ti2alc) Phase Nanolaminates: Synthesis, Microstructure and Micro-Mechanical Characterization

SSRN

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SSRN 2024年

作者： Supakul, Skye Jain, Manish Yaddanapudi, Krishna Gruber, Jacob El-Atwani, Osman Tucker, Garritt J. Pathak, Siddhartha Materials Science and Engineering Department Iowa State University IA50011 United States Laboratory for Mechanics of Materials and Nanostructures Department of Materials Science and Engineering University of California DavisCA95616 United States Materials Science Program Colorado School of Mines GoldenCO80401 United States Materials Science and Technology Division Department of Physics Baylor University WacoTX76706 United States

We utilize elevated temperature physical vapor deposition techniques to design metal/MAX multilayered nanocomposite thin films with alternating nanoscale metallic (Nb, Ti) and MAX phase (Ti2AlC) layer thicknesses. These metal/MAX nanolaminate architectures attempt to exploit a unique hierarchical topology – as interfaces between the layers are expected to be in direct competition with the internal interfaces within the MAX layers, to drive their tunable macroscopic mechanical behavior. Our first deposition attempt with the Nb/Ti2AlC metal/MAX system showed highly diffused layer interfaces with distinct Ti rich and Nb-Al rich layers, with the presence of MAX phase alongside TiC and other Ti-Al and Nb-Al intermetallic phases. The Nb/Ti2AlC system possessed a layered architecture, though the MAX phases were not found to be continuously present in each alternating layer. The second Ti/Ti2AlC system showed a non-lamellar nanocomposite microstructure and the formation of mixed Tin+1AlCn phases (a mix of n = 1, 2), and no indication of layering. Diffusion occurring between the metal/MAX layers in both cases, likely due to the elevated temperatures during the deposition process, is speculated as the likely cause of these resultant microstructures. The mechanical properties of both systems were evaluated using micromechanical (nanoindentation and micro-pillar compression) techniques, and were found to be within the bounds predicted by composite theory for the Nb system (yield and instability strengths of 4.88±0.1 GPa and 5.57±0.03 GPa ) and just short of expectations for the Ti system (yield and instability strength of 5.61±0.28 GPa and 6.21±0.25 GPa). This work provides important insights for future depositions, such as the need to effectively block/mitigate interlayer diffusion by either lowering the deposition temperature or adding a third layer that can act as a diffusion barrier. © 2024, The Authors. All rights reserved.

关键词： Nanocomposites

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Cytometry in the Short-Wave Infrared

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ACS Nano 2024年第28期18卷 18534-18547页

作者： Liu, Te-I Wang, Jhih-Shan Nguyen, Ai-Phuong Raabe, Marco Quiroz Reyes, Carlos Jose Lin, Chih-Hsin Lin, Ching-Wei Institute of Atomic and Molecular Sciences Academia Sinica Taipei City106319 Taiwan Department of Materials Science and Engineering National Taiwan University Taipei City106319 Taiwan Department of Physics University of Stuttgart Stuttgart70174 Germany Department of Chemistry National Tsing Hua University Hsinchu300044 Taiwan International Ph.D. Program in Biomedical Engineering Taipei Medical University New Taipei City235603 Taiwan Graduate Institute of Nanomedicine and Medical Engineering Taipei Medical University New Taipei City235603 Taiwan

Cytometry plays a crucial role in characterizing cell properties, but its restricted optical window (400-850 nm) limits the number of stained fluorophores that can be detected simultaneously and hampers the study and utilization of short-wave infrared (SWIR;900-1700 nm) fluorophores in cells. Here we introduce two SWIR-based methods to address these limitations: SWIR flow cytometry and SWIR image cytometry. We develop a quantification protocol for deducing cellular fluorophore mass. Both systems achieve a limit of detection of ∼0.1 fg cell-1 within a 30 min experimental time frame, using individualized, high-purity (6,5) single-wall carbon nanotubes as a model fluorophore and macrophage-like RAW264.7 as a model cell line. This high-sensitivity feature reveals that low-dose (6,5) serves as an antioxidant, and cell morphology and oxidative stress dose-dependently correlate with (6,5) uptake. Our SWIR cytometry holds immediate applicability for existing SWIR fluorophores and offers a solution to the issue of spectral overlapping in conventional cytometry. © 2024 The Authors. Published by American Chemical Society.

关键词： Oxygen

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An expandable chamber for safe brain retraction: new technologies in the field of transcranial endoscopic surgery

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Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2023年第4期24卷 326-335页

作者： Elena ROCA Anna GOBETTI Giovanna CORNACCHIA Oscar VIVALDI Barbara BUFFOLI Giorgio RAMORINO Head and Neck Department NeurosurgeryIstituto Ospedaliero Fondazione Poliambulanza25124 BresciaItaly Technology for Health PhD Program University of Brescia25124 BresciaItaly Materials Science and Technology at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Metallurgy at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Anatomy and Physiopathology Division Department of Clinical and Experimental SciencesUniversity of Brescia25123 BresciaItaly

Neurosurgery is a highly specialized field:it often involves surgical manipulation of noble structures and cerebral retraction is frequently necessary to reach deep-seated brain *** are still no reliable methods preventing possible retraction *** objective of this study was to design work chambers well suited for transcranial endoscopic surgery while providing safe retraction of the surrounding brain *** chamber is designed to be inserted close to the intracranial point of interest;once it is best placed it can be *** should guarantee an appreciable workspace similar to that of current neurosurgical *** experimental aspect of this study involved the use of a force sensor to evaluate the pressures exerted on the brain tissue during the retraction *** pterional craniotomy,pressure measurements were made during retraction with the use of a conventional metal spatula with different *** that,although the force values necessary for retraction and exerted on the spatula by the neurosurgeon are the same,the local pressure exerted on the parenchyma at the edge of the spatula at different inclinations varied greatly.A new method of cerebral retraction using a chamber retractor(CR)has been designed to avoid any type of complication due to spatula edge overpressures and to maintain acceptable pressure values exerted on the parenchyma.

关键词： Brain retraction Spatula Brain retractor design Brain retraction injury Retraction complication Transcranial endoscopic surgery

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Morphology-controlled synthesis of multi-metal-based spinel oxide nanocatalysts and their performance for oxygen reduction

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Electron 2024年第3期2卷 13-19页

作者： Can Li Jinfong Pan Xiaobo Chen Lihua Zhang Anna Dennett Prabhu Bharathan Douglas Lee Guangwen Zhou Jiye Fang Department of Chemistry State University of New York at BinghamtonBinghamtonNew YorkUSA Materials Science and Engineering Program State University of New York at BinghamtonBinghamtonNew YorkUSA Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNew YorkUSA Department of Mechanical Engineering State University of New York at BinghamtonBinghamtonNew YorkUSA

We present a one-pot colloidal synthesis method for producing monodisperse multi-metal(Co,Mn,and Fe)spinel nanocrystals(NCs),including nanocubes,nano-octahedra,and concave *** study explores the mechanism of morphology control,showcasing the pivotal roles of metal precursors and capping ligands in determining the exposed crystal planes on the NC *** cubic spinel NCs,terminated with exclusive{100}-facets,demonstrate superior electrocatalytic activity for the oxygen reduction reaction(ORR)in alkaline media compared to their octahedral and concave cubic ***,at 0.85 V,(CoMn)Fe_(2)O_(4) spinel oxide nanocubes achieve a high mass activity of 23.9 A/g and exhibit excellent stability,highlighting the promising ORR performance associated with{100}-facets of multi-metal spinel oxides over other low-index and high-index *** by exploring the correlation between ORR performance and surface atom arrangement(active sites),surface element composition,as well as other factors,this study introduces a prospective approach for shapecontrolled synthesis of advanced spinel oxide *** underscores the significance of catalyst shape control and suggests potential applications as nonprecious metal ORR electrocatalysts.

关键词： alkaline media morphology control multi-metal spinel catalyst nanocrystals oxygen reduction

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