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Journal of Applied Mechanics, Transactions ASME 2021年第3期88卷

作者： Ruimi, Annie Cohen, Noy Mechanical Engineering Program Texas A&M University at Qatar Doha23874 Qatar Department of Materials Science and Engineering Technion - Israel Institute of Technology Haifa3200003 Israel

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Effect of Gd2O3 and GdF3 on Physical and Luminescence Properties of Ce3+ Ion-Doped Phosphate Glasses: A Comparative Study

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Brazilian Journal of Physics 2025年第5期55卷 1-10页

作者： Shoaib, M. Khan, I. Ifseisi, Ahmad A. Assal, Mohamed E. Ullah, I. Rooh, G. Chanthima, N. Intachai, N. Kothan, S. Lixian, Xiao YongTai, He Kaewkhao, J. School of Physics and Electrical Energy Engineering Chuxiong Normal University Chuxiong People’s Republic of China Department Department of Physics Abdul Wali Khan University Mardan Pakistan Department of Chemistry College of Science King Saud University Riyadh Saudi Arabia Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom Thailand Center of Excellence in Glass Technology and Materials Science (CEGM) Nakhon Pathom Rajabhat University Nakhon Pathom Thailand Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai Thailand

In this work, we carry out a comparative investigation of properties for 17Li₂O:17Gd2O3:(66-x) P2O5:xCeF3 (GdO-CeF), and 17Li2O:17GdF3:(66-x)P2O5:xCeF3 (GdF-CeF) glasses, where x = 0.00, 0.05, 0.1, 0.5, 1.0, and 2.0 in mol%. The density of the present glasses shows an increasing trend with the increasing concentration of the CeF3, while the molar volume decreases. It is recorded that the GdO-CeF glasses have a higher density than the GdF-CeF glasses. The luminescence intensity increases as the CeF3 concentration increases up to 1 mol% and then starts dropping. The decreasing trend of the luminescence intensity is due to the cross-relaxation process. It is also noted that GdF-CeF glasses show comparatively higher emission intensity than GdO-CeF glasses. The enhancement of the luminescence intensity is attributed to the lower phonon energy and lower concentration of the OH group. The FTIR spectroscopy confirms that GdF-CeF glasses have lower OH content because the band attributed to the OH group shows lower intensity as compared to the GdO-CeF glasses. Moreover, the integral scintillation efficiency of the present glasses was calculated and compared to the BGO crystal. From the results, it is found that the GdF-CeF glass shows higher efficiency compared to GdF-CeF glass. The impressive luminescence performance of Ce ions in the present glasses highlights these glasses as a promising candidate for next-generation scintillation applications.

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Thermo-optical properties of luminescent carbon dots produced from biomass of Orbignya speciosa (babassu coconut)

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Journal of Molecular Liquids 2025年 423卷

作者： Oliveira, Maykol Christian Damasceno Silva, Adriano Almeida Silva-Silva, Tânia Patrícia Silva, Jhaemely Gabrielly Vieira da Silva Júnior, José Ferreira Sanchez, David Bell, Maria José Valenzuela Garcia, Hans Anderson Viana, Bartolomeu Cruz Terrones, Mauricio Costa, Rubens Silva Santos, Francisco Eroni Paz Physics Department Federal University of Piauí PI 64049550 Brazil Postgraduate Program in Engineering and Materials Science Federal University of 64049550 PI Teresina Brazil Department of Physics and Center for 2-Dimensional and Layered Materials The Pennsylvania State University University ParkPA16802 United States Federal University of Juiz de Fora Institute of Exact Sciences Department of Physics University Campus - UFJF/ ICE/ Department of Physics Martelos MG Juiz de Fora36036330 Brazil Federal Institute of Piauí Paranaíba Campus PI Parnaíba64211145 Brazil

Exploring materials with high nonlinearities derived from organic and biological sources has become a significant focus within the scientific community. Among these materials, carbon dots (CDs) synthesized from biomass have emerged as promising candidates due to their sustainable and cost-effective production methods. This study synthesized CDs from Orbignya speciosa (babassu coconut) biomass via a hydrothermal route. UV–visible absorption and Infrared spectrum analysis revealed characteristic bands associated with the formation of dots and the electronic transitions π–π* from aromatic C=C bonds in the CDs’ core and n–π* transitions of surface carboxylate groups, photoluminescence as a function of temperature and lifetime decay measurements show that the photoluminescence mechanisms in these materials due this transitions comes from electronic indirect transitions from primary sources of the core and carbonyl boundings in the surface of the material, additionally, to this the Dynamic Light Scattering (DLS) and Transmission Electronic Microscopy (TEM) give the structural properties of the dots, amorphous and with a large size distribution with a mean size of (21 ± 1) nm. Thermal lens spectroscopy (TLS) was employed to determine the material's thermal diffusivity, reaching a maximum value of 2.03 × 10−7 m2/s as a function of dilution. The Z-scan technique under continuous wave (CW) excitation at 532 nm investigated nonlinear optical properties, yielding a maximum thermal nonlinear refractive index (n2(th)) value of −5.87 × 10−5 esu. Furthermore, the photothermal efficiency of the CDs was quantified at 505 nm, demonstrating a high absorption efficiency of 94.9 %, suggesting their potential application in photothermal therapies. These findings contribute to understanding babassu coconut CDs’ thermo-optical behavior, highlighting their promise for various practical applications, particularly in biomedicine. © 2025 Elsevier B.V.

关键词： Refractive index

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Anomalous Second Harmonic Generation from Atomically Thin MnBi2Te4

arXiv

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arXiv 2022年

作者： Fonseca, Jordan Diederich, Geoffrey M. Ovchinnikov, Dmitry Cai, Jiaqi Wang, Chong Yan, Jiaqiang Xiao, Di Xu, Xiaodong Department of Physics University of Washington SeattleWA98195 United States Intelligence Community Postdoctoral Research Fellowship Program University of Washington SeattleWA98195 United States Department of Materials Science and Engineering University of Washington SeattleWA98195 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States

MnBi2Te4 is a van der Waals topological insulator with intrinsic intralayer ferromagnetic exchange and A-type antiferromagnetic (AFM) interlayer coupling. Theoretically, it belongs to a class of structurally centrosymmetric crystals whose layered antiferromagnetic order breaks inversion symmetry for even layer numbers, making optical second harmonic generation (SHG) an ideal probe of the coupling between the crystal and magnetic structures. Here, we perform magnetic field and temperature dependent SHG measurements on MnBi2Te4 flakes ranging from bulk to monolayer thickness. We find that the dominant SHG signal from MnBi2Te4 is unexpectedly unrelated to both magnetic state and layer number. We suggest that surface SHG is the likely source of the observed strong SHG, whose symmetry matches that of the MnBi2Te4-vacuum interface. Our results highlight the importance of considering the surface contribution to inversion symmetry-breaking in van der Waals centrosymmetric magnets. Copyright © 2022, The Authors. All rights reserved.

关键词： Harmonic generation

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Challenges in Developing materials for Microreactors: A Case-Study of Yttrium Dihydride in Extreme Conditions

SSRN

引用

SSRN 2023年

作者： Tunes, Matheus Araujo Parkison, Darren Huang, Yuqing Chancey, M.R. Vogel, Sven C. Mehta, Vedant K. Torrez, Michael A. Luther, E.P. Valdez, James A. Wang, Yongqiang Yu, Jianguo Cinbiz, Mahmut Nedim Shivprasad, Aditya P. Kohnert, Cailtin A. Montanuniversität Leoben Austria Materials Science and Technology Division Los Alamos National Laboratory United States Department of Nuclear Engineering University of California Berkeley United States Department of Nuclear Engineering North Carolina State University United States Irradiated Fuels and Materials Idaho National Laboratory United States Program Project Interface Division Los Alamos National Laboratory United States Sigma Division Los Alamos National Laboratory United States Computational Mechanics and Materials Idaho National Laboratory United States Materials Science and Technology Division Oak Ridge National Laboratory United States

The development of microreactor technology presents an efficient solution for providing portable electricity, catering to both human space exploration needs within our solar system and supplying power to remote Earth-bound areas. The miniaturization of nuclear reactors poses immediate new challenges for materials science with respect to the capability for controlling nuclear reactions via thermalization of highly-energetic neutrons. In a microreactor, neutron moderation takes place in compact geometries, therefore new moderator materials are required to exhibit high moderating power per unit of volume. This challenge is currently being addressed through the advancement of hydrogen technology and materials science, particularly focusing on development of transition metal hydrides, but to date, research on their irradiation response, specifically regarding phase stability, hydrogen in-lattice retention, and their dependence on irradiation temperature and dose, is limited. Herein, we present a detailed investigation on the response of yttrium dihydride (\ce{YH2}) - the most suitable moderator candidate with respect to its high operational temperature - to heavy ion irradiation. A combination of multiple experimental techniques indicate that \ce{YH2} is stable up to an irradiation dose of 2 dpa and below 800$^{\circ}$C, identified as a critical temperature for \ce{YH2}. Our study unravels that voids emerge as the major form of radiation damage. Below the critical temperature no phase change, precipitation or amorphization was observed to occur. Experimental results from ion beam and neutron scattering techniques with concomitant density functional theory calculations have allowed us to elaborate and propose new strategies to enhance the metal hydride performance in extreme environments. © 2023, The Authors. All rights reserved.

关键词： Hydrides

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Modelling and Application of Jutes Fiber Reinforced Epoxy Composite in the Development of Wind Blade for Low Intensity Winds

SSRN

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SSRN 2023年

作者： Junio, Raí Felipe Pereira Cardoso, Robson Luis B. Ramos, Roberto Paulo B. Leão Filha, Elza M. Ribeiro, Mauricio M. Candido, Verônica S. Rodrigues, Jean da S. Silva, Douglas Santos Monteiro, Sergio N. Fujiyama, Roberto T. Federal University of Pará—UFPA Engineering of Natural Resources of the Amazon Program Rua Augusto Corrêa 01 PA BelémCEP 66075-110 Brazil Federal Institute of Education Science and Technology of Pará – IFPA Materials Engineering Program Avenida Almirante Barroso 1155 Marco PA BelémCEP 66093-020 Brazil Federal University of Pará - UFPA Postgraduate Program in Industrial Engineering Rua Augusto Corrêa 01 PA BelémCEP 66075-110 Brazil Federal Institute of Education Science and Technology of Pará – IFPA Estrada do Icuí Guajará PA AnanindeuaCEP 67125-000 Brazil Military Institute of Engineering – IME Department of Materials Science Praça General Tibúrcio 80 Praia Vermelha Urca RJ Rio de JaneiroCEP 22290-270 Brazil

Natural fibres show an increasing potential as reinforcement of polymeric composites, representing a promising concurrent to glass and carbon fibres extensively used in the construction of wind turbine blades synthetic fibres recyclability/disposability and high production energy cost have already been discussed in the main turbine producing centres. In particular, the development of wind turbines for low wind speed areas can increase the energy generation potential of regions not originally eligible for the installation of large turbines. This study proposes the evaluation of the use of jute fibre (Corchorus capsularis) reinforced epoxy composite in the construction of S1210 airfoil profile, of a small-scale wind turbine for low wind speed regions, considering the structural parameters, developed incorporating the Classical Laminate Theory (CLT) and Extended Bredt-Batho Shear Flow Theory (EBSFT).In order to raise the elastic properties and enable the use of the failure criteria, the composite blades were characterized according to ASTM standards. The mechanical properties surveyed, together with the elastic parameters of the cross section, torsional stiffness, axial stiffness and flexural rigidity, demonstrated the feasibility of using the jute fiber reinforced epoxy composite in the blade construction, evaluated according to the maximum tension failure criterion. © 2023, The Authors. All rights reserved.

关键词： Laminated composites

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Statistical Analysis of Polyester Resin Composite Reinforced with Miriti Fibers Braided Using Crochet Technique

SSRN

引用

SSRN 2023年

作者： Freires, Altairley M. de Corrêa, Alessandro C. Ribeiro, Mauricio M. Cardoso, Silmara M. da Rodrigues, Jean S. Silva, Douglas Santos Junio, Raí Felipe Pereira Monteiro, Sergio Neves Federal Institute of Education Science and Technology of Pará – IFPA Materials Engineering Program Avenida Almirante Barroso 1155 Marco PA BelémCEP 66093-020 Brazil Federal Institute of Education Science and Technology of Pará - IFPA Estrada do Icuí Guajará PA AnanindeuaCEP 67125-000 Brazil Military Institute of Engineering – IME Department of Materials Science Praça General Tibúrcio 80 Praia Vermelha Urca RJ Rio de JaneiroCEP 22290-270 Brazil

This work presents an experimental investigation of the mechanical properties of composites reinforced with crocheted fabrics of miriti fibers (Mauritia flexuosa) in a polyester matrix. The fabrics were manufactured under different grammages, with and without alkaline fiber treatment. The composites were produced using two different viscosity conditions of the polyester matrix and part of these underwent post-cure treatment at 60°C. In order to evaluate the effects of the input variables, the samples were produced by manual lamination with curing under vacuum, following a complete factorial experimental matrix type 24, tested according to the ASTM D 3039 standard. The results showed that the variables alkaline treatment of the fibers and viscosity of the matrix presented statistically significant effects on the responses limit of tensile strength and modulus of elasticity. The highest level of tensile strength (13.02 MPa) was obtained in composites with alkaline treatment of the fibers, fabric grammage 473.9 g/cm2, matrix with higher viscosity and post-cure application, while the modulus of elasticity obtained the best performance (1.59 GPa) in samples without alkaline treatment of the fibers, manufactured with the fabric of lower grammage, with a more viscous matrix and that underwent post-curing. © 2023, The Authors. All rights reserved.

关键词： Fibers

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Ranking Magnetic Colloid Performance for Magnetic Particle Imaging and Magnetic Particle Hyperthermia

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Advanced Functional materials 2025年第2期35卷 2412321页

作者： Carlton, Hayden Salimi, Marzieh Arepally, Nageshwar Bentolila, Gabriela Sharma, Anirudh Bibic, Adnan Newgren, Matt Goodwill, Patrick Attaluri, Anilchandra Korangath, Preethi Bulte, Jeff W.M. Ivkov, Robert Department of Radiation Oncology and Molecular Radiation Sciences the Johns Hopkins University School of Medicine BaltimoreMD21231 United States Russell H. Morgan Department of Radiology and Radiological Science Division of MR Research the Johns Hopkins University School of Medicine BaltimoreMD21205 United States Cellular Imaging Section and Vascular Biology Program Institute for Cell Engineering the Johns Hopkins University School of Medicine BaltimoreMD21205 United States Department of Mechanical Engineering School of Science Engineering and Technology The Pennsylvania State University – Harrisburg HarrisburgPA17057 United States F.M. Kirby Research Center for Functional Brain Imaging Kennedy Krieger Inc. BaltimoreMD21205 United States Magnetic Insight Inc. AlamedaCA94502 United States Department of Biomedical Engineering the Johns Hopkins University School of Medicine BaltimoreMD21205 United States Department of Chemical & Biomolecular Engineering Whiting School of Engineering Johns Hopkins University BaltimoreMD21218 United States Department of Oncology Sydney Kimmel Comprehensive Cancer Center Johns Hopkins University School of Medicine BaltimoreMD21287 United States Department of Mechanical Engineering Whiting School of Engineering Johns Hopkins University BaltimoreMD21218 United States Department of Materials Science and Engineering Whiting School of Engineering Johns Hopkins University BaltimoreMD21218 United States

Magnetic particle imaging (MPI) is an emerging modality that can address longstanding technological challenges encountered with magnetic particle hyperthermia (MPH) cancer therapy. MPI is a tracer technology compatible with MPH for which magnetic nanoparticles (MNPs) provide signal for MPI and heat for MPH. Identifying whether a specific MNP formulation is suitable for both modalities is essential for clinical implementation. Current models predict that functional requirements of each modality impose conflicting demands on nanoparticle magnetic properties. This objective here is to develop a measurement and ranking scheme based on end-use performance to streamline evaluation of candidate MNP formulations. The measured MPI point-spread function (PSF) and specific loss power (SLP) is combined to generate a single numerical value for comparison on a relative ranking scale, or figure of merit (FoM). 12 aqueous iron-containing formulations are evaluated, including FDA-approved (parenteral) iron-containing colloids. MNPs with high (Synomag-D70: 123.4), medium (Synomag-D50: 63.2), and low (NanoXact: 0.147) FoM values are selected for in vivo validation of the selection scheme in subcutaneous 4T1 tumors. Results demonstrate that the proposed ranking accurately assessed the relative performance of MNPs for MPI and MPH. Data demonstrated that image quality and tumor temperature rise increased with FoM ranking, validating predictions. It isshown that the MPI signal correlated with MNP concentration in tissue. Computational heat transfer models anchored on tumor MPI data harmonized with experimental results to within an average of 2 °C when MNP content estimated from MPI data is included. Computational studies emphasized the importance of post-injection MNP quantitation and MPI spatial resolution. © 2024 The Author(s). Advanced Functional materials published by Wiley-VCH GmbH.

关键词： Hyperthermia therapy

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Elastocaloric effect in amorphous polymer networks undergoing mechanotropic phase transitions

arXiv

引用

arXiv 2021年

作者： Koch, Jeremy A. Herman, Jeremy A. White, Timothy J. University of Colorado Boulder Department of Chemical and Biological Engineering United States University of Colorado Boulder Materials Science and Engineering Program United States

Deformations of amorphous polymer networks prepared with significant concentrations of liquid crystalline mesogens have been recently reported to undergo mechanotropic phase transitions. Here, we report that these mechanotropic phase transitions are accompanied by an elastocaloric response (∆T = 2.9 K). Applied uniaxial strain to the elastomeric polymer network transitions the organization of the material from a disordered, amorphous state (order parameter Q = 0) to the nematic phase (Q = 0.47). Both the magnitude of the elastocaloric temperature change and mechanically induced order parameter are dependent on the concentration of liquid crystal mesogens in the material. While the observed temperature changes in these materials are smaller than those observed in shape memory alloys, the responsivity, defined as the temperature change divided by the input stress, is larger by an order of magnitude. © 2021, CC BY-NC-SA.

关键词： Liquid crystals

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Tuning light emission crossovers in atomic-scale aluminum plasmonic tunnel junctions

arXiv

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arXiv 2022年

作者： Zhu, Yunxuan Cui, Longji Abbasi, Mahdiyeh Natelson, Douglas Department of Physics and Astronomy Rice University HoustonTX77005 United States Paul M. Rady Department of Mechanical Engineering University of Colorado BoulderCO80309 United States Materials Science and Engineering Program University of Colorado BoulderCO80309 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States

Atomic sized plasmonic tunnel junctions are of fundamental interest, with great promise as the smallest on-chip light sources in various optoelectronic applications. Several mechanisms of light emission in electrically driven plasmonic tunnel junctions have been proposed, from single-electron or higher order multi-electron inelastic tunneling to recombination from a steady-state population of hot carriers. By progressively altering the tunneling conductance of an aluminum junction, we tune the dominant light emission mechanism through these possibilities for the first time, finding quantitative agreement with theory in each regime. Improved plasmonic resonances in the energy range of interest increase photon yields by two orders of magnitude. These results demonstrate that the dominant emission mechanism is set by a combination of tunneling rate, hot carrier relaxation timescales, and junction plasmonic properties. Copyright © 2022, The Authors. All rights reserved.

关键词： Tunnel junctions

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