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Effects of spatial uniformity of continuous and pulse laser irradiation on the microstructure and mechanical properties of Ti-6Al-4V in powder bed fusion

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materials Today Communications 2025年 46卷

作者： Moon, Seunghwan Ji, Seungmuk Ko, Yoonseok Lee, Min-Su Jun, Tea-Sung Kim, Dong-Ik Yeo, Jong-Souk School of Integrated Technology College of Computing Yonsei University Seoul03722 Korea Republic of BK21 Graduate Program in Intelligent Semiconductor Technology Yonsei University Seoul03722 Korea Republic of Center for Energy Materials Research Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Mechanical Engineering Incheon National University Incheon22012 Korea Republic of

Powder bed fusion of metals with laser beam (PBF-LB/M) using Ti-6Al-4V (Ti64) has enabled delicate fabrication of biocompatible medical implants. This research focuses on how the spatial uniformity of laser irradiation affects material under continuous wave (CW) and pulse width modulated (PWM) laser conditions, using a self-developed PBF-LB/M system. The volumetric energy density (VED) was used as a reference parameter in order to accurately compare the effects of CW and PWM lasers, but limitations of VED, which does not include spatial and kinetic factors, which are reinforced in the PWM laser process, were also considered. Results revealed that the uniform distribution of energy irradiation across the entire region brought similar porosities and Vickers hardness tendencies for CW and PWM laser processes. In contrast, the spatially nonuniform energy transfer resulted in a significantly higher porosity in the specimen fabricated using the PWM laser than that produced using the CW laser at the same VED, reducing compressive yield strength. The electron backscattered diffraction analysis showed no significant differences in the average grain size, phase distribution, and misorientation angle of the samples produced using CW and PWM lasers under the same VED. However, sharper grains with an aspect ratio of less than 0.3 were 7 % higher in specimens produced using the PWM laser. This study highlights the possibility of controlling the microstructure and mechanical properties in a wider range when using the PWM laser with spatially nonuniform irradiation. © 2025 Elsevier Ltd

关键词： Vickers hardness

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Regulating COOH Intermediate via Rationally Constructed Surface-Active Sites of Bi2WO6for Solar-Driven CO2-to-CO Production (Adv. Funct. Mater. 23/2025)

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Advanced Functional materials 2025年第23期35卷

作者： Nguyen Quoc Thang Amr Sabbah Raghunath Putikam Chih-Yang Huang Tsai-Yu Lin Mahmoud Kamal Hussien Heng-Liang Wu Ming-Chang Lin Chih-Hao Lee Kuei-Hsien Chen Li-Chyong Chen Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Institute of Physics Academia Sinica Taipei 15201 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo 11421 Egypt Department of Applied Chemistry National Yang-Ming Chiao Tung University Hsinchu 30010 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University (NTU-MST) Taipei 10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program (TIGP) Academia Sincia Taipei 11529 Taiwan Department of Chemistry Faculty of Science Assiut University Assiut 71516 Egypt Department of Chemistry National Taiwan University Taipei 10617 Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan

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Terahertz Cavity Phonon Polaritons in Lead Telluride in the Deep-Strong Coupling Regime

arXiv

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arXiv 2025年

作者： Baydin, Andrey Manjappa, Manukumara Mishra, Sobhan Subhra Xu, Hongjing Doumani, Jacques Tay, Fuyang Kim, Dasom Rappl, Paulo H.O. Abramof, Eduardo Singh, Ranjan Hernandez, Felix G.G. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley–Curl Institute Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States Instrumentation and Applied Physics Department Indian Institute of Science Bangalore560012 India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 639798 Singapore Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Group of Research and Development in Materials and Plasma National Institute for Space Research São José dos Campos São Paulo12201-970 Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Instituto de Física Universidade de São Paulo São Paulo05508-090 Brazil Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

Lead telluride is an important thermoelectric material due to its large Seebeck coefficient combined with its unusually low thermal conductivity that is related to the strong anharmonicity of phonons in this material. Here, we have studied the resonant and nonperturbative coupling of transverse optical phonons in lead telluride with cavity photons inside small-mode-volume metallic metasurface cavities that have photonic modes with terahertz frequencies. We observed a giant vacuum Rabi splitting on the order of the bare phonon and cavity frequencies. Through terahertz time-domain spectroscopy experiments, we systematically studied the vacuum Rabi splitting as a function of sample thickness, temperature, and cavity length. Under the strongest light–matter coupling conditions, the strength of coupling exceeded the bare phonon and cavity frequencies, putting the system into the deep-strong coupling regime. These results demonstrate that this uniquely tunable platform is promising for realizing and understanding predicted cavity-vacuum-induced ferroelectric instabilities and exploring applications of light–matter coupling in the ultrastrong and deep-strong coupling regimes in quantum technology. Copyright © 2025, The Authors. All rights reserved.

关键词： Phonons

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Study of structural, electronic, optical and mechanical properties of K₂ScCuF₆ and K₂YCuF₆ perovskites via DFT calculations

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Results in Physics 2024年 62卷

作者： Amina Uzair, Muhammad Sohail Khan, Amir Quraishi, A.M. Almahri, Albandary Soliyeva, Mukhlisa Tirth, Vineet Algahtani, Ali Abdullah Mohammed, Rawaa M. Sarker, Mahidur R. Hadia, N.M.A. Zaman, Abid Department of Physics Bacha Khan University Charsadda Pakistan Department of Physics University of Peshawar KP Peshawar 25120 Pakistan Department of Energy Systems Research Ajou University Suwon 16499 South Korea Department of Electrical Engineering College of Engineering Qassim University Buraydah 51452 Saudi Arabia Department of Chemistry College of Science and Humanities in Prince Sattam Bin Abdulaziz University Al-Kharj 11942 Saudi Arabia Department of Physics and Teaching Methods Tashkent State Pedagogical University Tashkent Uzbekistan Mechanical Engineering Department College of Engineering King Khalid University Asir Abha 61421 Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Asir Guraiger Abha 61413 Saudi Arabia Department of Physics Government Post Graduate College Karak 27200 Pakistan Ph.D in clinical microbiology College of Nursing Al-Mustaqbal University Iraq Institute of Visual Informatics Universiti Kebangsaan Malaysia Selangor Bangi 43600 Malaysia Universidad de Diseño Innovación y Tecnología UDIT Av. Alfonso XIII 97 Madrid 28016 Spain Department of Physics College of Science Jouf University Al-Jouf Sakaka 2014 Saudi Arabia Department of Physics Riphah International University Islamabad 44000 Pakistan

Owing to their outstanding performance, environmental friendliness and stability, perovskite materials are becoming very important for solar cells, renewable energy sources and thermoelectric generators. This work uses the first-principles approach to explore the structural, electronic, optical and elastic characteristics of K₂ScCuF₆ and K₂YCuF₆ double perovskites. The negative formation energy in Birch-Murnaghan confirms the stability of the compounds in Fm3m (2 2 5) space group. The analysis of the electronic properties concluded that both K₂ScCuF₆ and K₂YCuF₆ are narrow band gap semiconductors materials, having 1.2 and 2.3 eV of bandgap energies, respectively. This was further verified by the density of states. The mechanical stability, ductility and anisotropic nature of the compounds was shown by analyzing their elastic constants. In addition, the optical properties showed transparency at low energy values but showed both transmission and absorption characteristics at higher energy levels. These interesting results imply that K₂ScCuF₆ and K₂YCuF₆ have significant potential in solar cells, light-emitting diodes (LEDs), smart windows, displays and sensors. © 2024 The Author(s)

关键词： Density Functional Theory Elastic behaviors Opto-electronic properties Pb-free Double perovskite

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Self-packaged stretchable printed circuits with ligand-bound liquid metal particles in elastomer

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Nature Communications 2025年第1期16卷 1-11页

作者： Seo, Hyeonyeob Lee, Gun-Hee Park, Jiwoo Kim, Dong-Yeong Son, Yeonzu Kim, Semin Nam, Kum Seok Yang, Congqi Won, Joonhee Bae, Jae-Young Kim, Hyunjun Kang, Seung-Kyun Park, Steve Kang, Jiheong Park, Seongjun Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Departments of Cogno-Mechatronics Engineering Pusan National University Busan South Korea Departments of Optics and Mechatronics Engineering Pusan National University Busan South Korea School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Program of Brain and Cognitive Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Medical Research Center Seoul National University Seoul South Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Department of Materials Science and Engineering Seoul National University Seoul South Korea KAIST Institute for NanoCentury Daejeon South Korea Department of Chemistry Seoul National University Seoul South Korea Department of Biomedical Sciences College of Medicine Seoul National University Seoul South Korea School of Transdisciplinary Innovations Seoul National University Seoul South Korea Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul South Korea Department of Transdisciplinary Medicine Seoul National University Hospital Seoul South Korea

Packaging in stretchable electronics is crucial to protect components from environmental damage while preserving mechanical flexibility and providing electrical insulation. The conventional packaging process involves multiple steps that increase in complexity as the number of circuit layers multiply. In this study, we introduce a self-packaged stretchable printed circuit board enabled by the in situ phase separation of liquid metal particles (LMPs) within various polymer matrices during solution-based printing processes. The ligand-bound LMPs (LB-LMPs), engineered to inhibit oxide growth, undergo in situ sintering, prompting vertical phase separation. This synthesis strategy not only achieves high initial conductivity of the LMPs but also encapsulates them within the polymer matrix, preventing leakage and providing electrical insulation. Our method enables multi-layer circuit printing, eliminating the need for additional activation and packaging processes. Furthermore, by integrating conductive materials into packaging layers for selective electrical conductivity, vertical interconnect accesses and conductive pads can be formed, enabling large-scale, stretchable, and leakage-free multi-layer electrical circuits and bio-interfaces. © The Author(s) 2025.

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Bridging particle deformability and collective response in soft solids

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Physical Review materials 2021年第5期5卷 055605-055605页

作者： John D. Treado Dong Wang Arman Boromand Michael P. Murrell Mark D. Shattuck Corey S. O'Hern Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Biomedical Engineering Yale University New Haven Connecticut 06520 USA Department of Physics Yale University New Haven Connecticut 06520 USA Systems Biology Institute Yale University West Haven Connecticut 06516 USA Benjamin Levich Institute and Physics Department The City College of New York New York New York 10031 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

Soft, amorphous solids such as tissues, foams, and emulsions are composed of deformable particles. However, the effect of single-particle deformability on the collective behavior of soft solids is still poorly understood. We perform numerical simulations of two-dimensional jammed packings of explicitly deformable particles to study the mechanical response of model soft solids. We find that jammed packings of deformable particles with excess shape degrees of freedom possess low-frequency quartic vibrational modes that stabilize the packings even though they possess fewer interparticle contacts than the nominal isostatic value. Adding intraparticle constraints can rigidify the particles, but these particles undergo a buckling transition and gain an effective shape degree of freedom when their preferred perimeter is above a threshold value. We find that the mechanical response of jammed packings of deformable particles with shape degrees of freedom differs significantly from that of jammed packings of rigid-shape particles, which emphasizes the importance of particle deformability in modeling soft solids.

关键词： Collective behavior Jamming Emulsions Foams Tissues Molecular dynamics

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Bioinspired graphene-based silver nanoparticles: Fabrication, characterization and antibacterial activity 11

Bioinspired graphene-based silver nanoparticles: Fabrication...

引用

11th National Conference on Solid State Chemistry and Allied Areas, NCSCA 2019

作者： Potbhare, Ajay K. Umekar, Mayuri S. Chouke, Prashant B. Bagade, Mahendra B. Tarik Aziz, S.K. Abdala, Ahmed A. Chaudhary, Ratiram G. Post Graduate Department of Chemistry Seth Kesarimal Porwal College of Arts Commerce and Science Kamptee441001 India Bar Ilan University Ramat-Gan52900 Israel Chemical Engineering Program Texas AandM University at Qatar POB 23784 Doha Qatar

Herein we present a fabrication and antibacterial assays of novel silver nanoparticles (Ag NPs) on the surface of graphene oxide (GO) nanosheets as a multifunctional antibacterial material by using Pseudomonas aeruginosa biomass extract the nanocomposites has fabricated. as a synthesized material were characterized by spectroscopic technique including XRD, FTIR, EDX, Raman and TEM. XRD analysis specified the cubic crustal structure of NCs, while TEM rendered an average particle size of 25»nm of Ag-GO NCs. As a result, the fabricated Ag-GO NCs was tested against gram-positive and gram-negative strains and the results shows the Ag-GO NCs to be more effective against gram-negative bacteria (***). © 2019 Elsevier Ltd.

关键词： Graphene

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Experimental study on capillarity and thermal of metal foam as the wick structure in heat pipe application

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AIP Conference Proceedings 2023年第1期2865卷

作者： Syahrul Humaidi Doli Bonardo Dahniar Hasibuan Perdamean Sebayang Achmad Maulana Soehada Post Graduate Program (Physics) FMIPA Universitas Sumatera Utara Jl. Bioteknologi I Kampus USU Medan 20155 Indonesia Refrigeration and Air Conditioning Engineering Study Program Politeknik Tanjungbalai Jl. Sei Raja Sei Tualang Raso Tanjungbalai 21345 Indonesia Research Center for Advanced Materials National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia. Department of Physics Universitas Sutomo Serang Banten 42183 Indonesia

Metal foam as a wick structure in heat pipe applications is analyzed in terms of its capillary and thermal properties to determine the perspectives and challenges ahead. The surface coating of metal foam with a hydrophobic layer was analyzed for its effect on the overall capillarity in order to determine the optimal metal foam as a wick structure in the heat pipe. The hydrophobic coating is applied by a simple spray technique to the entire surface of the metal foam with repetition. Metal foam without a hydrophobic layer has stable capillarity properties among other samples, this indicates that the hydrophobic layer can inhibit the ferro fluid flow rate in the metal foam pore network as a whole as a result of the interaction between the metal foam phases and the hydrophobic layer. Metal foam 15 PPI without hydrophobic coating has an even and stable heat distribution, high conductivity and low resistivity which is suitable for application as a wick structure in heat pipes.

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Influence of Morphology on Fracture Propagation of PMMAe/PC Blend in Tensile Tests at High Strain Rate

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Macromolecular Symposia 2020年第1期394卷 2000153-2000153页

作者： Gomes, Felipe Pedro da Costa Reinaldo, Juciklécia da Silva Rodrigues, Antônio Henrique Venâncio de Macedo, Thatiana Cristina Pereira Silva, Bismarck Luiz Ito, Edson Noriyuki Graduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte Avenida Senador Salgado Filho 3000 NatalRio Grande do Norte59078–970 Brazil Mechanical Engineering Department Federal University of Rio Grande do Norte Avenida Senador Salgado Filho 3000 NatalRio Grande do Norte59078–970 Brazil Graduate Program in Materials Science and Engineering Federal University of Sergipe Avenida Marechal Rondon s/n 49100-000 São CristóvãoSergipe Brazil Materials Engineering Department Federal University of Rio Grande do Norte Avenida Senador Salgado Filho 3000 NatalRio Grande do Norte59078–970 Brazil

The aim of this study is to evaluate toughness mechanism of elastomeric poly(methyl methacrylate) (PMMAe) and polycarbonate (PC) blend through crack propagation at high speed tensile tests. Samples are processed using two types of extruders, single and twin screw, in order to eliminate the influence of processing in the final product's properties. Pure polymers and polymer blend samples are cryo-ultramicrotomed and their morphology is characterized using atomic force microscopy (AFM). Fractured samples obtained from uniaxial tensile tests at high strain rate are inspected using optical microscopy (OM) and scanning electron microscopy (SEM). The results obtained for the PMMAe/PC blend in tests at high deformation rate showed that the shear rate during the mixing process influences the maximum strength of the polymer blend near its region of co-continuous morphology. The visual evaluation of the fracture surface and the fractographic analysis corroborated the results of this study of polymer toughening. © 2020 Wiley-VCH GmbH

关键词： Fracture

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Terahertz cavity magnon polaritons

arXiv

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arXiv 2023年

作者： Kritzell, T. Elijah Baydin, Andrey Tay, Fuyang Rodriguez, Rodolfo Nojiri, Hiroyuki Everitt, Henry O. Barsukov, Igor Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Physics and Astronomy University of California RiversideCA92521 United States Institute for Materials Research Tohoku University Sendai980-8577 Japan DEVCOM Army Research Laboratory-South HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

Hybrid light-matter coupled states, or polaritons, in magnetic materials have attracted significant attention due to their potential for enabling novel applications in spintronics and quantum information processing. However, most studies to date have been carried out for ferromagnetic materials with magnon excitations at gigahertz frequencies. Here, we have investigated strong resonant photon-magnon coupling at frequencies above 1 terahertz for the first time in a prototypical room-temperature antiferromagnetic insulator, NiO, inside a Fabry-Pérot cavity. The cavity was formed by the crystal itself when it was thinned down to an optimized thickness. By using terahertz time-domain spectroscopy in high magnetic fields up to 25 T, we swept the magnon frequency through Fabry-Pérot cavity modes and observed photon-magnon anticrossing behavior, demonstrating clear vacuum Rabi splittings exceeding the polariton linewidths. These results show that NiO is a promising platform for exploring antiferromagnetic spintronics and cavity magnonics in the terahertz frequency range. Copyright © 2023, The Authors. All rights reserved.

关键词： Polariton

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