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SSRN 2024年

作者： Jorge, Alberto M. Chatenet, Marian Roche, Virginie Berthomé, Gregory Champion, Yannick LEPMI Grenoble38000 France Univ. Grenoble Alpes CNRS Grenoble INP SIMaP Grenoble38000 France Federal University of Sao Carlos Graduate Program of Materials Science and Engineering DEMa Sao Carlos13565-905 Brazil

A nano-porous Ti25 V0.5Zr13Nb51Co6Fe4 metallic alloy was produced by de-alloying (Ti31V26Zr12Nb26Co5)50Fe50. The material was characterized using X-ray diffraction and SEM imaging showing complex concentrated solid solution and interesting OER properties were revealed from cyclic voltammetry. X-ray photoelectron spectroscopy shows a significant content of Fe-doped Co(OH)2 at the surface of the nanoporous alloy that explains the high OER activity. Nanoporous structure in particular nanosized ligaments and surface curvature are identified in connexion to the OER properties. © 2024, The Authors. All rights reserved.

关键词： Cyclic voltammetry

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Biogenic synthesis of highly fluorescent carbon dots using Azadirachta indica leaves: An eco-friendly approach with enhanced photocatalytic degradation efficiency towards Malachite green

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Chemosphere 2023年第1期341卷 139946页

作者： Vijeata, Anjali Chaudhary, Ganga Ram Chaudhary, Savita Umar, Ahmad Department of Chemistry and Centre of Advanced Studies in Chemistry Panjab University Chandigarh160014 India Najran University Najran11001 Saudi Arabia Department of Materials Science and Engineering The Ohio State University ColumbusOH43210 United States

A simpler and efficient method has been developed for the green synthesis of highly fluorescent carbon dots (CDs) from Azadirachta Indica leaves. The surface morphology of developed CDs has shown the existence of spherical particles in the size range of 3–8 nm with superior biocompatibility and high quantum yield value i.e. 42.3%. The particles exhibited a highly fluorescent and crystalline nature along with a bandgap value of 4.02 eV. The prepared CDs served as a factorial design for the sensing and degradation of Malachite green among other dyes. The main perspective of the current finding is that the designed catalyst exhibits excellent sensing results towards Malachite green with a limit of detection i.e. 0.144 μM in the concentration range of 0–50 μM. Moreover, the UV triggered results of photocatalysis illustrated a good dye removal efficacy by developed CDs with an average of 90.73, 98.25, 52 and 6.13% degradation in Methylene blue (MB), Malachite green (MG), Rhodamine 6G (Rh 6G) and Methyl orange (MO) upon 70 min of irradiation with mercury lamp. Additionally, the proton NMR, FTIR and FESEM results of the recycled samples also confirm the complete degradation of MG dye with the application of N-CDs. © 2023

关键词： Catalysts

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Phase Transitions of the CU6Sn5 Phase Under Electric Currents

Phase Transitions of the CU6Sn5 Phase Under Electric Current...

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International Conference on Electronics Packaging (ICEP)

作者： Shubhayan Mukherjee Yu-Chen Liu Shih-Kang Lin Department of Materials Science and Engineering National Cheng Kung University Tainan Taiwan Hierarchical Green-Energy Materials (Hi-GEM) Research Centre National Cheng Kung University Tainan Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan Department of Mechanical Engineering National Cheng Kung University Tainan Taiwan

ISBN: (数字)9784991191190

ISBN: (纸本)9798331514747

The performance and reliability of interfacial regions in electronic solder joints are critical for the durability of lead-free solder systems. The intermetallic compound $\text{Cu}_{6}\text{Sn}_{5}$ , which forms at the interface between Sn-based solders and Cu substrates, exists in two crystal structures: the low-temperature monoclinic phase $(\eta^{\prime}-\text{Cu}_{6}\text{Sn}_{5})$ and the high-temperature hexagonal phase $(\eta-\text{Cu}_{6}\text{Sn}_{5})$ . Although the thermal behavior of these phases is well-documented, the effects of electric current on the stability and mechanical properties of $\eta^{\prime}-\text{Cu}_{6}\text{Sn}_{5}$ remain less understood. This study investigates the impact of electric current on the microstructural evolution of $\eta^{\prime}-\text{Cu}_{6}\text{Sn}_{5}$ through high-resolution transmission electron microscopy (HR-TEM) following the synchrotron radiation-based X-ray diffraction (SR-XRD). Single-phase $\eta^{\prime}-\text{Cu}_{6}\text{Sn}_{5}$ samples were subjected to a current density of 1.5 x 10 3 A/cm 2 for 5 hours. Microstructural observations from HR-TEM, following SR-XRD, reveal significant insights into the behavior of monoclinic $\eta^{\prime}-\text{Cu}_{6}\text{Sn}_{5}$ under electric current stressing. These findings offer insights into the relationship between electric current and phase stability in interfacial compounds, which could enhance the reliability of solder joints in advanced electronic systems.

关键词： X-ray scattering Synchrotrons High-resolution transmission electron microscopy materials reliability X-ray diffraction Stability analysis Compounds Current Soldering Thermal stability

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Ultrafast measurements of the interfacial spin Seebeck effect in Au and rare-earth iron-garnet bilayers

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Physical Review materials 2021年第7期5卷 074401-074401页

作者： Víctor H. Ortiz Michael J. Gomez Yawen Liu Mohammed Aldosary Jing Shi Richard B. Wilson Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside California 92521 USA Department of Physics and Astronomy Program University of California Riverside California 92521 USA

We investigate picosecond spin currents across Au/iron-garnet interfaces in response to ultrafast laser heating of the electrons in the Au film. In the picoseconds after optical heating, interfacial spin currents occur due to an interfacial temperature difference between electrons in the metal and magnons in the insulator. We report measurements of this interfacial longitudinal spin Seebeck effect between Au and rare-earth iron-garnet insulators, i.e., RE3Fe5O12, where RE is Y, Eu, Tb, Tm. By systematically varying the rare-earth element, we modify the total magnetic moment of the iron garnet. We use time-domain thermoreflectance measurements to characterize the thermal response of the bilayer to ultrafast optical heating. We use time-resolved magneto-optic Kerr effect measurements of the Au layer to measure the time evolution of spin accumulation in the Au film. Replacing Y with other rare earths enhances the electron-magnon conductance Ge−m at the Au iron-garnet interface by as much as a factor of 3. The electron-magnon conductance does not follow the trend of either the total magnetization of the iron garnet or the magnetic moment of the rare earth.

关键词： Magneto-optical Kerr effect Magnons Spin Seebeck effect Spin polarization Ultrafast magnetic effects

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Subwavelength-Engineered Antislot Photonic Crystals in a Silicon Photonics Foundry for On-chip Communications

Subwavelength-Engineered Antislot Photonic Crystals in a Sil...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Kellen P. Arnold Joshua A. Allen Sami I. Halimi Landen D. Ryder Francis O. Afzal Yusheng Bian Abdelsalam Aboketaf Takako Hirokawa Kevin Dezfulian Michal Rakowski Rod Augur Karen Nummy Sharon M. Weiss Interdisciplinary Materials Science Program Vanderbilt University Nashville TN USA Department of Electrical and Computer Engineering Vanderbilt University Nashville TN USA NASA Goddard Space Flight Center Greenbelt MD US GlobalFoundries Malta NY USA

We report scalable foundry fabrication and characterization of photonic crystal nanobeam waveguides incorporating subwavelength-scale dielectric antislot unit cells. This work enables enhanced light-matter interaction... 详细信息

ISBN: (纸本)9798350369311

关键词： Mach-Zehnder interferometers Optical device fabrication Photonic crystals Waveguide lasers Lasers and electrooptics Electro-optic modulators Silicon photonics Foundries System-on-chip Electro-optical waveguides

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Design, Development and Performance Evaluation of a Miniature Electrostatic Precipitator in an Indoor Environment

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SSRN 2024年

作者： Kumar, Aiswarya Nawale, Prashant Rohidas Sahu, Manoranjan Aerosol and Nanoparticle Technology Laboratory Environmental Science and Engineering Department Indian Institute of Technology Bombay Mumbai400076 India Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai400076 India Centre for Machine Intelligence and Data Science Indian Institute of Technology Bombay Mumbai400076 India

Different PM capture technologies are available in market as well as on lab scale, they pose several drawbacks. Therefore, a miniature ESP was designed in laboratory and operated at optimal operating conditions to obtain maximised capture of PM. Results from study confirmed that designed ESP was capable of capturing various standard aerosol, major indoor sources and infiltrated PM with a total removal efficiency of 97.87% to 99.97% in PM sizes from 10 nm to 800 nm. Additionally, energy consumed/clean air delivery rate and emission of by-products were found to be comparatively lesser compared to commercial purifiers. © 2024, The Authors. All rights reserved.

关键词： Electrostatic precipitators

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Lignocellulose aerogel and amorphous silica nanoparticles from rice husks

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Journal of Leather science and engineering 2021年第1期3卷 11-17页

作者： Zichao Wei Andrew T.Smith William R.T.Tait Jingjing Liu Hao Ding Hui Wang Weixing Wang Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsCT 06269USA Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsCT 06269USA College of Materials Science and Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA

Rice Husks(RHs)are one of the most abundant sources of biomass in the world due to rice *** and silica are two of the main components of RHs,which allow RHs to be applied in different *** can be partially dissolved in 1-butyl-3-methylimidazolium chloride(BMIMCl),which is a simple way of competing with the traditional extraction methods that suffer from high chemical consumption.A lignocellulose freeze gel is obtained via a cyclic liquid nitrogen freeze-thaw(NFT)***-functional self-assembled lignocellulose aerogel is obtained after CO_(2) supercritical *** on the aerogel’s special properties,two routes are developed for practical *** one hand,the aerogel is coated to exhibit a superhydrophobic property that can be applied as an absorbent for oil *** the other hand,a carbon aerogel is synthesized via a pyrolysis process,resulting in a porous amorphous *** residue after partially dissolving lignocellulose in BMIMCl is further calcined to obtain amorphous silica nanoparticles,achieving a comprehensive application of RHs.

关键词： Rice husks Lignocellulose Carbon aerogel Silica

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Fine-tuning of key parameters to enhance biomass and nutritional polyunsaturated fatty acids production from Thraustochytrium sp.

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Bioresource Technology 2024年 394卷 130252页

作者： Chauhan, Ajeet Singh Patel, Anil Kumar Singhania, Reeta Rani Vadrale, Akash Pralhad Chen, Chiu-Wen Giri, Balendu Sheker Chang, Jo-Shu Dong, Cheng-Di Institute of Aquatic Science and Technology College of Hydrosphere National Kaohsiung University of Science and Technology Kaohsiung City81157 Taiwan Centre for Energy and Environmental Sustainability Uttar Pradesh Lucknow226 029 India School of Engineering University of Petroleum and Energy Studies Uttarakhand Dehradun India Research Center for Smart Sustainable Circular Economy Tunghai University Taiwan Department of Chemical and Materials Engineering Tunghai University Taichung407 Taiwan Department of Chemical Engineering National Cheng Kung University Tainan701 Taiwan Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung City Taiwan

The escalating demand for long-chain polyunsaturated fatty acids (PUFAs) due to their vital health effects has deepened the exploration of sustainable sources. Thraustochytrium sp. stands out as a promising platform for omega-3 and 6 PUFA production. This research strategically optimizes key parameters: temperature, salinity, pH, and G:Y:P ratio and the optimized conditions for maximum biomass, total lipid, and DHA enhancement were 28 °C, 50 %, 6, and 10:1:2 respectively. Process optimization enhanced 32.30 and 31.92 % biomass (9.88 g/L) and lipid (6.57 g/L) yield. Notably, DHA concentration experienced a substantial rise of 69.91 % (1.63 g/L), accompanied by notable increases in EPA and DPA by 82.69 % and 31.47 %, respectively. MANOVA analysis underscored the statistical significance of the optimization process (p © 2023 Elsevier Ltd

关键词： Polyunsaturated fatty acids

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Intermetallic Compound Formation and Growth Behavior Between Ruthenium and Tin System

Intermetallic Compound Formation and Growth Behavior Between...

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International Conference on Electronics Packaging (ICEP)

作者： Hsiu-mei Yang Tzu-hsuan Huang Yu-hsuan Lin Min-cian Chen Shih-kang Lin Department of Materials Science and Engineering National Cheng Kung University Tainan Taiwan Program on Semiconductor Packaging and Testing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan Taiwan Taiwan Semiconductor Manufacturing Company Limited Hsinchu Taiwan

ISBN: (数字)9784991191190

ISBN: (纸本)9798331514747

This study investigates the liquid/solid reflow process under a vacuum environment of 1 Pa at reflow temperatures of 300°C for different reaction times. The research finds that at the Sn/Ru interface, during 300°C reflow for 24 hours, the RU 3 Sn 7 intermetallic compound was formed. As the reflow time increases, the IMC thickness increases. This study provides a fundamental understanding of the interfacial reactions between Sn and Ru. The mechanisms of the interfacial reactions and the growth kinetics of the intermetallic compounds (IMC) will be revealed through phase diagrams, thermodynamics, and kinetic analysis.

关键词： Thermodynamics Ruthenium Tin Atoms Kinetic theory Intermetallic Compounds Microstructure Substrates Electronics packaging

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Influence of Crystallographic Orientation on the Deformation of Ag Nanoparticles During High-Speed Impact

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SSRN 2022年

作者： Becker, Michael F. Kovar, Desiderio Chitrakar, T.V. The University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program Texas Materials Institute United States Department of Electrical and Computer Engineering United States Department of Mechanical Engineering Center for Additive Manufacturing and Design Innovation

Several related aerosol processes utilize high velocity impact of solid nanoparticles to produce nanograined films including the aerosol deposition method, jet molding, vacuum kinetic spraying, and micro cold spray. Although the influence of important variables such as particle size and particle impact velocity, on particle deformation and film formation have been previously explored, other variables have not been systematically explored. Because particles impact with a full range of orientations, an understanding of the effect of particle orientation is required to predict film microstructures. Molecular dynamics simulations were conducted to determine the influence of particle crystallographic orientation on the particle deformation upon impact and the resulting microstructure of the deposit. We show that the orientations that produce the largest overall particle deformation are not correlated to orientations where initiation of plastic deformation is easiest. Rather, the deformation is heterogenous and depends on the mechanisms responsible for deformation. Two deformation mechanisms are identified: 1) dislocation plasticity and 2) disordering followed by viscous flow. The fraction of the atoms in the impacting particle that experience permanent deformation by each mechanism is quantified as a function of particle orientation. The implications of the effects of particle crystallographic orientation on film microstructures are also discussed. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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