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SSRN 2024年

作者： Nenninger, Tara Sansoz, Frederic Department of Mechanical Engineering The University of Vermont BurlingtonVT05405 United States Materials Science Program The University of Vermont BurlingtonVT05405 United States

Spectral analysis of local atomic environments has become a powerful tool for studying solute atom segregation and interactions at grain boundaries in nanocrystalline alloys. When applied to individual grain boundaries, the spectral analysis has shown that solute-solute interaction can be either attractive or repulsive, with long-range relative attraction enhancing the likelihood for solute cluster nucleation. In this article, we combine this analysis with a new grain-boundary structure descriptor based on grain-boundary atom coordination, to investigate the impact of grain-boundary junctions on solute atom segregation in polycrystals. Specifically, we systematically characterize the nucleation tendency of solute clusters at various types of ordinary grain boundaries, triple junctions, and high-order junctions in Ag polycrystals containing either Ni or Cu solute atoms. Our findings demonstrate that the nucleation of solute clusters at grain boundaries is primarily driven by long-range relative solute attraction, rather than short-range solute-solute interactions. This effect is most pronounced near grain-boundary junctions. Our study highlights the multiscale nature of solute segregation at crystalline interfaces and provides new insights into the complex phenomena governing heterogeneous solute segregation in grain-boundary networks. © 2024, The Authors. All rights reserved.

关键词： Nanocrystalline alloys

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Layer-by-Layer Assembly of Chitosan and Quince Seed Gum Polyelectrolytes as a Ph-Responsive, On-Off Switchable Multilayer Film for Controlled Release of Ibuprofen

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SSRN 2024年

作者： Kaviani, Alireza Pircheraghi, Gholamreza Bagheri, Reza Azizi Saadatlou, Ghazaleh Demirel, A. Levent Department of Materials Science and Engineering Sharif University of Technology P.O. Box: 11365‐9466 Tehran Iran Materials Science & Engineering Graduate Program Koç University Sarıyer Istanbul34450 Turkey Chemistry Department Koç University Sarıyer Istanbul34450 Turkey

Polysaccharide-based multilayer films have shown substantial potential for drug delivery application. Herein, polyelectrolyte multilayers using Chitosan (CS) and Quince seed gum (QSG) are constructed and the effects of assembly pH, salt concentration, and post-assembly pH are systematically investigated. It was evident that both mass per unit area (10000 ng/cm2) and the wet thickness (107.8 nm) after the deposition of 5 bilayers were accurately estimated by viscoelastic model due to the highly swollen state of films. Atomic Force Microscopy (AFM) could feasibly demonstrate the development of globular structures during the layer-by-layer assembly. Ellipsometry analysis showed that the variation assembly pH resulted in conformational changes from extended to coiled. Consequently, different optical thicknesses as well as transitions from exponential to linear growth were observed. Moreover, extrinsic charge compensation was responsible for coiling or extensive counterion screening of polyelectrolyte chains depending on the NaCl concentration. CS/QSG films displayed pH-stimulus on–off switching behavior in pH 2 and 7.4 for 3 cycles. The constructed film could absorb 1200 ng/cm2 within 60 min at pH 7.4. The in vitro release kinetic from IBF-loaded samples showed pH dependency. The CS/QSG multilayer film can be considered as a smart and tunable pH stimuli system for drug loading/release applications. © 2024, The Authors. All rights reserved.

关键词： Chitosan

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Study of Precipitates Formed During Solidification and Post-solidification Stage in Low-Sc Al-Mg-Sc Alloys

Study of Precipitates Formed During Solidification and Post-...

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Light Metals Symposium held at the TMS Annual Meeting and Exhibition, TMS 2025

作者： Nunes, Anderson Thadeu Afonso, Conrado Ramos Moreira Spinelli, José Eduardo Graduate Program in Materials Science and Engineering Federal University of São Carlos São CarlosSP 13565-905 Brazil Department of Materials Engineering Federal University of São Carlos UFSCar São CarlosSP 13565-905 Brazil

ISBN: (纸本)9783031806759

Low-Sc (3Mg2 eutectic was identified in the intercellular/interdendritic regions of the alloys. The β-Al3Mg2 phase was detected in the micrographs of the three Al-Mg-Sc alloys, with more detailed observation in the fracture region of the AlMg3Sc0.1 alloy sample. The Al3Sc phase was identified forming isolated primary clusters during solidification in the AlMg5Sc0.1 and AlMg10Sc0.1 alloys. Nanometric Al3Sc p s with irregular shapes and dimensions smaller than 10 nm were identified in the AlMg5Sc0.1 alloy solidified at 0.7 K/s. © The Minerals, Metals & materials Society 2025.

关键词： Aluminum alloys

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Exchange-correlation potential built on the derivative discontinuity of electron density

arXiv

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arXiv 2024年

作者： Huang, Chen Department of Scientific Computing Materials Science and Engineering Program National High Magnetic Field Laboratory Florida State University TallahasseeFL32306 United States

Electronic structures are fully determined by the exchange-correlation (XC) potential. In this work, we develop a new method to construct reliable XC potentials by properly mixing the exact exchange and the local density approximation potentials in real space. The spatially dependent mixing parameter is derived based on the derivative discontinuity of electron density and is first-principle. We derived the equations for solving the mixing parameter and proposed an approximation to simplify these equations. Based on this approximation, this new method gives reasonable predictions for the ionization energies, fundamental gaps, and singlet-triplet energy differences for various molecular systems. The impact of the approximation on the constructed XC potentials is examined, and it is found that the quality of the XC potentials can be further improved by removing the approximation. This work demonstrates that the derivative discontinuity of electron density is a promising constraint for constructing high-quality XC potentials. © 2024, CC BY.

关键词： Local density approximation

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Comparison of Coherent and Incoherent Donut Beams for Deep Tissue STED Microscopy

Comparison of Coherent and Incoherent Donut Beams for Deep T...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Shanavas, Thariq McLeod, Robert R. Siemens, Mark E. Gopinath, Juliet T. Department of Physics University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering University of Colorado BoulderCO80309 United States Department of Physics University of Denver DenverCO80204 United States Materials Science Engineering Program University of Colorado BoulderCO80309 United States

We numerically compare the null quality for STED microscopy generated by Laguerre-Gaussian beams with orbital angular momentum and donut beams generated by incoherent addition of orthogonal Hermite Gaussian beams when... 详细信息

ISBN: (纸本)9781957171258

关键词： Tissue

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Evaluation of Single and Duplex Plasma Treatment Applied to Aisi 409 Stainless Steel

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SSRN 2024年

作者： do Monte e Silva, André Felipe Soares de Almeida, Larissa Solano Monteiro, Leandro Rossino, Luciana Sgarbi Nunes, Maelson Sousa Libório, Maxwell Santana de Carvalho Costa, Thércio Henrique Bandeira, Rafael Marinho de Sousa, Rômulo Ribeiro Magalhães Post-Graduate Materials Science and Engineering Program Federal University of Piauí PI Teresina Brazil Post-Graduate Program in Materials Science Federal University of São Carlos São Carlos Brazil Post-Graduate Program in Chemistry Federal University of Piauí PI Teresina Brazil School of Science and Technology Federal University of Rio Grande do Norte RN Natal Brazil Brazil Department of Mechanical Engineering Federal University of Piauí PI Teresina Brazil Brazil

The industrial landscape has witnessed a growing demand for components exhibiting superior performance and extended lifespan, especially in parts made of stainless steels like AISI 409 steel, widely used in automotive exhaust systems, heat exchangers, and lightweight structural components. This study investigates the enhancement of surface properties of AISI 409 stainless steel through cathodic cage plasma nitriding (CCPN) and cathodic cage plasma deposition (CCPD) processes, focusing on the novel implementation of duplex treatments. The research aims to improve the mechanical strength, wear resistance, and corrosion resistance of the steel by forming nitrides and vanadium nitride films on its surface. The duplex treatments, specifically N400D450 and N450D450, were found to significantly enhance the hardness of AISI 409 stainless steel, with the N450D450 sample achieving a maximum hardness of 1100 HV—a 461.22% increase compared to the untreated steel. This enhancement is attributed to the formation of a thick, uniform nitrided layer followed by a vanadium nitride film. The critical role of processing order was highlighted, with the sequence of nitriding followed by deposition proving more effective than the reverse. Corrosion resistance was markedly improved in the duplex-treated samples. The N450D450 sample exhibited an Ecorr of -198 mV and reduced jcorr values, indicating superior resistance to corrosive environments. These results underscore the synergistic effect of combining nitriding and vanadium deposition, which optimizes the formation of protective surface layers. Overall, this study demonstrates that duplex treatments significantly enhance the surface properties of AISI 409 stainless steel, offering the potential for extended component lifespan and reduced maintenance in industrial applications. The findings suggest that careful control of process parameters and treatment sequence is essential for achieving optimal results. © 2024, The Authors. All rights

关键词： Tribology

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An Assessment of Patent Scoring Using Natural Language programming

An Assessment of Patent Scoring Using Natural Language Progr...

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2022 Portland International Conference on Management of engineering and Technology, PICMET 2022

作者： Khongamnuaisak, Lertchai Pentrakoon, Duanghathai Sinthupinyo, Sukree Suanpong, Kwanrat Chulalongkorn University Technopreneurship and Innovation Management Program Graduate School Bangkok Thailand Chulalongkorn University Faculty of Science Department of Materials Science Bangkok Thailand Faculty of Engineering Chulalongkorn University Department of Computer Engineering Bangkok Thailand Chulalongkorn Business School Commerce Department Bangkok Thailand

ISBN: (数字)9781890843410

ISBN: (纸本)9781890843410

Patent has been an increasingly important role in the world because it is not only significant to protect the invention of the company's business but also to generate revenue from the commercialization. WIPO (2018) reports that the repository has many patents so, to assess patent, it consumes time and requires various expertise. Generally, several models have been developed to address this matter, which to assess using a questionnaire tool for portfolios by human. Perhaps, there is not precise because it is assessed base on personal bias or previous experience of expertise. So that, occurs bias any limitation exists that our research will address by artificial intelligence. Thus, this research applies a Natural Language programming to assess for commercial of the patent. Then, the obtained data is used to assigned factors and calculate the model for assessing the commercialization of patent. This finding should deliver an alternative effective patent assessment, which is tool addresses, some current deficiency patent assessment for commercialization. © 2022 PICMET.

关键词： Patents and inventions

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Electrochemical and Structural Characterization of Electropolymerized Composite of NH2-Graphene and Polyaniline

Electrochemical and Structural Characterization of Electropo...

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Agrosystem engineering, Technology & Applications (AGRETA), IEEE International Conference on

作者： Jonathan E. Pa-a Erwin P. Enriquez Department of Chemistry Silliman University Dumaguete City Philippines Department of Chemistry and Program in Materials Science and Engineering School of Science and Engineering Ateneo de Manila University Quezon City Philippines

The NH 2 -graphene/polyaniline composites are synthesized by in situ electropolymerization of aniline monomer and NH 2 -functionalized graphene (“NH 2 -graphene”) sheets in acidic electrolyte solution by constant-potential coulometry. Cyclic voltammetry and FTIR analyses confirm the covalent attachment of polyaniline backbone onto NH 2 -graphene in the composite. Having the same functional moieties (NH 2 -group), the polyaniline nanofibers are grafted laterally forming ’synapses’ resulting in improved charge-transfer reaction and stability of the composite. This link is believed to be ’phenazine-like’ microstructure formed at the edges of graphene sheets as evidenced by SEM and TEM images. The voltammograms of the NH 2 -graphene/polyaniline composite films coated onto pencil lead graphite electrodes (PLGE) exhibit remarkable increase in the current density relative to the bare PLGE and polyaniline-coated PLGEs. Based on the electrochemical impedance spectroscopy (EIS) measurements, the enhancement in the electrochemical properties of the composite may be due to the good chargetransfer redox activity of polyaniline fibers that are grafted onto the NH 2 -graphene sheet. The composite film also demonstrated photo-responsive property which could be useful for sensing or photovoltaic cell design.

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Accelerating Degradable Composite Breakdown Using Citrus Processing Side Streams

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2024年第2期1卷 344-354页

作者： Aline V. Duarte Laís T. Possari Lívia M. G. Gonçalves Baltus C. Bonse Talita R. Rigolin Sílvia H. P. Bettini Graduate Program in Materials Science and Engineering Federal University of Sao Carlos Rod. Washington Luiz 235 São Carlos 13565-905 Brazil Department of Materials Engineering Centro Universitário FEI 09850-901 São Bernardo do Campo Brazil Department of Materials Engineering Federal University of Sao Carlos Rod. Washington Luiz 235 São Carlos 13565-905 Brazil

Daily, vast amounts of waste are produced in the orange juice industry, a large part of which is reused in low-added-value products. In this work, orange vesicle fiber residues from the juice sieving stage were plasticized by extrusion, producing a thermoplastic citrus pulp (TCP). This pulp was incorporated into poly(butylene succinate) (PBS) at up to 50 wt %. The influence of TCP on the molar mass, morphology, tensile properties, rheological behavior, and biodeterioration of PBS in soil was evaluated. Highly flexible compounds with elongations similar to those of PBS were produced. Scanning electron microscopy analyses suggested good dispersion between the TCP and PBS phases, verified after acid extraction of pectin. Rheological analyses indicated the presence of strong interactions in the interconnected network formed by pectin gel, percolation of TCP lignocellulosic fibers, or both. Analyses of mass loss by burial in soil showed that the higher the TCP content in PBS is, the higher and faster the biodeterioration is. Size exclusion chromatography analyses indicated that the greater the concentration of TCP and the better dispersed it was in the compounds, the lower molar masses populations appeared in PBS, indicating higher rates of degradation of PBS in the presence of TCP. This innovative approach not only reuses the waste produced in the orange juice industry but also demonstrates the potential for obtaining environmentally friendly compounds.

关键词： Beverages Carbohydrates Fibers Polymers Soils

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Evidence of magnetoelectronic electromagnon-mediated transport in flexoelectronic heterostructures

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Physical Review B 2023年第16期107卷 165305-165305页

作者： Anand Katailiha Paul C. Lou Ravindra G. Bhardwaj W. P. Beyermann Sandeep Kumar Department of Mechanical Engineering University of California Riverside California 92521 USA Department of Physics and Astronomy University of California Riverside California 92521 USA Materials Science and Engineering Program University of California Riverside California 92521 USA

The superposition of atomic vibrations and flexoelectronic effect gives rise to a cross correlation between free charge carriers and temporal magnetic moment of phonons in conducting heterostructures under an applied strain gradient. The resulting dynamical coupling is expected to give rise to quasiparticle excitations called magnetoelectronic electromagnons that carry electronic charge and temporal magnetic moment. Here, we report experimental evidence of magnetoelectronic electromagnons in the freestanding degenerately doped p-Si based heterostructure thin film samples. These quasiparticle excitations give rise to long-distance (>100 μm) spin transport, demonstrated using spatially modulated transverse magnetothermoelectric and nonlocal resistance measurements. The magnetoelectronic electromagnons are nonreciprocal and give rise to large magnetochiral anisotropy (0.352A−1T−1) that diminishes at lower temperatures. The superposition of nonreciprocal magnetoelectronic electromagnons gives rise to longitudinal and transverse modulations in charge carrier density, spin density, and magnetic moment, demonstrated using the Hall effect and edge dependent magnetoresistance measurements, which can also be called inhomogeneous magnetoelectronic multiferroic effect. These quasiparticle excitations are analogous to photons where time dependent polarization and temporal magnetic moment replace electric and magnetic field, respectively, and most likely topological because they manifest topological Nernst effect. Hence, the magnetoelectronic electromagnon can potentially give rise to quantum interference and entanglement effects in conducting solid state systems at room temperature in addition to efficient spin transport.

关键词： Flexoelectricity Magnetic coupling Magnetotransport Spin current Spin-phonon coupling Doped semiconductors Multiferroics

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