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The Connectivity of a Ceramic Component and its Effect on Dielectric and Thermal Properties in Low-Temperature Processed Li2moo4 – Polytetrafluorethylene Composites

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SSRN 2023年

作者： Hong, Jun Young Bae, Sumin Jung, Youngsoo Kwon, Do-Kyun Lee, Jung-Kun Department of Mechanical and Materials Science and Engineering University of Pittsburgh PittsburghPA15261 United States Department of Materials Science and Engineering Korea Aerospace University Gyeonggi-do Goyang10540 Korea Republic of

This study explores the influence of processing methods on the connectivity of a ceramic component and its effect on the dielectric and thermal properties in Li2MoO4-polytetrafluoroethylene (LMO-PTFE) composites. Three processing cases were examined: cold sintering (case 1), dry pressing and subsequent thermal annealing (case 2), and cold sintering and subsequent thermal annealing (case 3). The processing methods change the connectivity of ceramic grains, the crystallinity of PTFE, and the dielectric properties of these composites. The microstructure analysis shows that CSP increases the LMO domain size via the dissolution and precipitation steps. The connected LMO grains increases the transport length of Li ions under electric field and manifests the space charge polarization in the dielectric measurments. More connected LMO grains of the composites also enhance thermal transport, while phonon scattering of discrete LMO particles lowers the thermal conductivity of the composites. © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

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Exploring Low-dose and Fast Electron Ptychography using l0 Regularisation of Extended Ptychographical Iterative Engine

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 344-345页

作者： Moshtaghpour, Amirafshar Velazco-Torrejon, Abner Robinson, Alex W. Kirkland, Angus I. Browning, Nigel D. Rosalind Franklin Institute Harwell Science & Innovation Campus Didcot United Kingdom Mechanical Materials Aerospace Engineering University of Liverpool Liverpool United Kingdom Department of Materials University of Oxford Oxford United Kingdom Physical & Computational Science Pacific Northwest National Lab Richland United States Sivananthan Laboratories 590 Territorial Drive Bolingbrook United States

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Chlorinated polymerized small molecule acceptor enabling ternary all-polymer solar cells with over 16.6% efficiency

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science China Chemistry 2022年第5期65卷 954-963页

作者： Ke Hu Jiaqi Du Can Zhu Wenbin Lai Jing Li Jingming Xin Wei Ma Zhanjun Zhang Jinyuan Zhang Lei Meng Yongfang Li School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Recently,all-polymer solar cells(all-PSCs) based on polymerized small molecule acceptors(PSMAs) have achieved significant *** blending has proven to be an effective strategy to further boost the power conversion efficiency(PCE) of the ***,a new A-DA′D-A small-molecule acceptor-based PSMA(named as PYCl-T) was designed and synthesized,which possesses similar polymer backbone with the widely used PY-IT,but with chlorine substitution on the A-end groups in the A-DA′D-A ***-T was then employed as the third component into the PM6:PY-IT system and the ternary all-PSCs based on PM6:PY-IT:PYCl-T demonstrated a high PCE of 16.62%(certified value of 16.3%).Moreover,the PCE of 15.52% was realized in the enlarged ternary all-PSCs with effective area of 1 cm^(2),indicating the great potential in large-scale ***,the optimized ternary blend films of PM6:PY-IT:PYCl-T show excellent thermal stability at 150 ℃.This work demonstrates that the utilization of a ternary blend system involving two well-compatible PSMA polymer acceptors is an effective strategy to boost the performance of the all-PSCs.

关键词： all-polymer solar cells polymerized small molecular acceptors chlorine substitution ternary all polymer solar cells stability

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Synchronous Hetero-Interface and Vacancy engineering for Construction of Pitaya-Like CoSe1-x/C@NC@ZnSe Nanosphere Toward Ultrastable Sodium-Ion Half/Full Batteries

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Advanced Energy materials 2025年

作者： Kang, Wenpei Han, Mengjia Niu, Mang Liang, Yazhan Hu, Ying Fan, Xiaoyu An, Xuguang Xi, Baojuan Sun, Daofeng Xiong, Shenglin Qingdao266580 China State Key Laboratory of Bio-fibers and Eco-textiles Institute of Biochemical Engineering College of Materials Science and Engineering Qingdao University Qingdao266071 China School of Chemistry and Chemical Engineering Shandong University Jinan250100 China School of Mechanical Engineering Chengdu University Chengdu610106 China

Transition metal selenides have attracted extensive attention as promising anode materials for sodium-ion batteries (SIBs) due to their fascinating physical chemistry characteristics. However, its cycling performance especially at high currents, is still unsatisfactory owing to the intrinsic limited conductivity. Herein, N-doped carbon shell coated and ZnSe bonded Se-vacancy enriched CoSe1-x (CoSe1-x/C@NC@ZnSe, CZSCV) nanospheres with abundant hetero-interfaces are designed through an in situ Se transfer strategy. Owing to the ingenious structure, as an anode material in SIBs, CZSCV demonstrates superior cycling stability (363.5 mAh g−1 at 10 A g−1 after 1000 cycles) and high-rate sodium storage capability (193.9 mAh g−1 at 20 A g−1 after 5000 cycles). Meanwhile, in the CZSCV//Na3V2(PO4)3@C full cell, it also delivers a stable capacity of 201.4 mAh g−1 at 1.0 A g−1 and provides a high energy density of 397.4 Wh kg−1 with a power density of 231.6 W kg−1. Based on the kinetics analysis and the density functional theory calculation, the hetero-interfaces and enriched Se-vacancies can synergistically accelerate the Na+/electron transfer, owing to the charge redistribution, the decreased diffusion barrier of Na+ and increased pseudo-capacitive capacity contribution. As a result, excellent high-rate anode material can be achieved for the SIBs. © 2025 Wiley-VCH GmbH.

关键词： Nanospheres

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Achieving Ultra-Broad Microwave Absorption Bandwidth Around Millimeter-Wave Atmospheric Window Through an Intentional Manipulation on Multi-Magnetic Resonance Behavior

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Nano-Micro Letters 2024年第9期16卷 291-307页

作者： Chuyang Liu Lu Xu Xueyu Xiang Yujing Zhang Li Zhou Bo Ouyang Fan Wu Dong‑Hyun Kim Guangbin Ji School of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuPeople’s Republic of China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Physics Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuPeople’s Republic of China School of Physics Chungbuk National UniversityCheongju 28644South Korea Department of Chemistry School of ScienceTianjin UniversityTianjin 300072People’s Republic of China

The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range,posing increasingly severe challenges in terms of electromagnetic pollution prevention and radar ***,existing millimeter-wave absorbers are still inadequate in addressing these issues due to their monotonous magnetic resonance *** this work,rare-earth La^(3+)and non-magnetic Zr^(4+)ions are simultaneously incorporated into M-type barium ferrite(BaM)to intentionally manipulate the multi-magnetic resonance *** leveraging the contrary impact of La^(3+)and Zr^(4+)ions on magnetocrystalline anisotropy field,the restrictive relationship between intensity and frequency of the multi-magnetic resonance is successfully *** magnetic resonance peak-differentiating and imitating results confirm that significant multi-magnetic resonance phenomenon emerges around 35 GHz due to the reinforced exchange coupling effect between Fe^(3+)and Fe^(2+)***,Mosbauer spectra analysis,first-principle calculations,and least square fitting collectively identify that additional La^(3+)doping leads to a profound rearrangement of Zr^(4+)occupation and thus makes the portion of polarization/conduction loss increase *** a consequence,the La^(3+)-Zr^(4+)co-doped BaM achieves an ultra-broad bandwidth of 12.5+GHz covering from 27.5 to 40+GHz,which holds remarkable potential for millimeter-wave absorbers around the atmospheric window of 35 GHz.

关键词： Microwave absorption Ultra-broad bandwidth M-type barium ferrite Magnetocrystalline anisotropy field Multimagnetic resonance

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N-mirror Robot System for Laser Surgery: A Simulation Study

N-mirror Robot System for Laser Surgery: A Simulation Study

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International Symposium on Medical Robotics (ISMR)

作者： Guangshen Ma Weston Ross Patrick J. Codd Department of Mechanical Engineering and Materials Science Duke University Department of Neurosurgery Duke University Medical Center

Automated laser surgery with sensor fusion is an important problem in medical robotics since it requires precise control of mirrors used to steer the laser systems. The propagation of the laser beam should satisfy the geometric constraints of the surgical site but the relation between the number of mirrors and the design of the optical path remains an unsolved problem. Furthermore, different types of surgery (e.g. endoscopic vs open surgery) can require different optical designs with varying number of mirrors to successfully steer the laser beam to the tissue. A generalized method for controlling the laser beam in such systems remains an open research question. This paper proposes an analytical model for a laser-based surgical system with an arbitrary number of mirrors, which is referred as an ‘ $N$ -mirror” robotic system. This system consists of three laser inputs to transmit the laser beam to the tissue surface through $N$ number of mirrors, which can achieve surface scanning, tissue resection and tissue classification separately. For sensor information alignment, the forward and inverse kinematics of the $N$ -mirror robot system are derived and used to calculate the mirror angles for laser steering at the target surface. We propose a system calibration method to determine the laser input configuration that is required in the kinematic modelling. We conduct simulation experiments for a simulated 3-mirror system of an actual robotic laser platform and a 6-mirror simulated robot, both with 3-laser inputs. The simulation experiments for system calibration show results of maximum position offset smaller than $0.127 \ {mm}$ and maximum angle offset smaller than 0.05° for the optimal laser input predictions.

关键词： Analytical models Solid modeling Medical robotics Surface emitting lasers Kinematics Laser modes Robot sensing systems

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Correlating mechanical Properties of Al/Al Bimetal Composite and its Constituents Using Combined Experiment and Microstructure-Based Multiscale Modeling Approach

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SSRN 2024年

作者： Bong, Hyuk Jong Sung, Jin Young Lee, Jinwoo Kim, Min Ho Lee, Kwang Seok Department of Materials Processing Korea Institute of Materials Science Gyeongnam Changwon51508 Korea Republic of School of Mechanical Engineering University of Ulsan Ulsan44610 Korea Republic of

A combined experiment and multiscale modeling approach was presented to correlate the mechanical properties of a roll-bonded AA1050/AA3004 bimetal clad sheet and constituents. The mechanical responses of the 2-ply AA1050/AA3004 and constituents were measured under various loading conditions. For the measurements, each constituent was separated from the clad sheet using electrical discharge machining and uniaxial tensile tests. Continuum-scale yield functions such as isotropic von Mises and anisotropic/non-quadratic Yld2000-2d were developed for the two constituents and the bimetal clad sheet. A grain-scale crystal plasticity finite element (CPFE) simulations were also performed incorporated with newly developed representative volume element considering measured microstructural attributes. These CPFE predictions were used to identify the anisotropy coefficients for Yld2000-2d. Using the identified yield functions, finite element modeling was followed in which the mechanical properties of each constituent sheet were addressed separately. This is a new approach developed in the current work and it enables a fundamental correlation between multilayered material and its constituents. The mechanical properties of the bimetal clad sheet under the uniaxial tensions were predicted using those of the constituents and compared with calculations based on known rule of mixture (ROM) approach. The two approaches well reproduced stress–strain curves and r–value evolutions. The two FE modeling approaches were also applied to an independent test (i.e., the limiting dome height). The predictions were in good agreement with the experimental data. Finally, the mechanical properties of the bimetal clad sheet and constituents were correlated, and proper modeling scheme for multilayered materials is proposed. © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Interfacial challenges for all-solid-state batteries based on sulfide solid electrolytes

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Journal of Materiomics 2021年第2期7卷 209-218页

作者： Shuo Wang Ruyi Fang Yutao Li Yuan Liu Chengzhou Xin Felix H.Richter Ce-Wen Nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX78712United States Institute of Physical Chemistry&Center for Materials Research Justus-Liebig-University GiessenHeinrich-Buff-Ring 17D-35392GiessenGermany State Key Laboratory of Bio-fibers and Eco-textiles Institute of Biochemical EngineeringCollege of Materials Science and EngineeringQingdao UniversityQingdao266071China

Sulfide solid electrolytes(e.g.,lithium thiophosphates)have the highest room-temperature ionic conductivity(-10^(-2) S cm^(-1))among solid Li-ion conductors so far,and thus have attracted ever-increasing attention for high energy-density and safety all-solid-state batteries(ASSBs).However,interfacial issues between sulfide electrolytes and electrodes have been the main challenges for their applications in *** interfacial instabilities would occur due to side reactions of sulfides with electrodes,poor solid-solid contact,and lithium dendrites during charge/discharge *** this review,we analyze the interfacial issues in ASSBs based on sulfide electrolytes,and in particular,discuss strategies for solving these interfacial issues and stabilize the electrode-electrolyte ***,a perspective of the interfacial engineering for sulfide-based ASSBs is provided.

关键词： Sulfide solid electrolytes Interfacial engineering All-solid-state batteries Li-metal protection

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Ultrafast evanescent heat transfer across solid interfaces via hyperbolic phonon-polaritons in hexagonal boron nitride

arXiv

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arXiv 2024年

作者： Hutchins, William Tomko, John A. Hirt, Dan M. Zare, Saman Matson, Joseph R. Diaz-Granados, Katja He, Mingze Pfeifer, Thomas Li, Jiahan Edgar, James Maria, Jon-Paul Caldwell, Joshua D. Hopkins, Patrick E. Department of Mechanical and Aerospace Engineering University of Virginia CharlottesvilleVA22904 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37212 United States Department of Mechanical Engineering Vanderbilt University NashvilleTN37212 United States Tim Taylor Dept. of Chemical Engineering Kansas State University ManhattanKS United States Department of Materials Science and Engineering Pennsylvania State University University ParkPA16802 United States Department of Materials Science and Engineering University of Virginia CharlottesvilleVA22904 United States Department of Physics University of Virginia CharlottesvilleVA22904 United States

The efficiency of phonon-mediated heat transport is limited by the intrinsic atomistic properties of materials, seemingly providing an upper limit to heat transfer in materials and across their interfaces. The typical speeds of conductive transport, which are inherently limited by the chemical bonds and atomic masses, dictate how quickly heat will move in solids. Given that phonon-polaritons (PhPs), or coupled phonon-photon modes, can propagate at speeds approaching 1% of the speed of light – orders of magnitude faster than transport within a pure diffusive phonon conductor – we demonstrate that volume-confined, hyperbolic phonon-polariton (HPhP) modes supported by many biaxial polar crystals can couple energy across solid-solid interfaces at an order of magnitude higher rates than phonon-phonon conduction alone. Using pump-probe thermoreflectance with a mid-infrared, tunable, probe pulse with sub-picosecond resolution, we demonstrate remote and spectrally selective excitation of the HPhP modes in hexagonal boron nitride (hBN) in response to radiative heating from a thermally emitting gold source. Our work demonstrates a new avenue for interfacial heat transfer based on broadband radiative coupling from a hot spot in a gold film to hBN HPhPs, independent of the broad spectral mismatch between the pump (visible) and probe (mid-IR) pulses employed. This methodology can be used to bypass the intrinsically limiting phonon-phonon conductive pathway, thus providing an alternative means of heat transfer across interfaces. Further, our time-resolved measurements of the temperature changes of the HPhP modes in hBN show that through polaritonic coupling, a material can transfer heat across and away from an interface at rates orders of magnitude faster than diffusive phonon speeds intrinsic to the material, thus demonstrating a pronounced thermal transport enhancement in hBN via phonon-polariton coupling. © 2024, CC BY.

关键词： III-V semiconductors

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A transparent quasi-solid slippery surface with photothermal/electrothermal properties for all-day anti-icing/deicing

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science China Technological sciences 2025年第7期68卷 1-11页

作者： Zhao, Zehui Wang, Yamei Zhou, Xinzhao Cui, Xianxian Wang, Zelinlan Liu, Guang Li, Shaomin Chen, Dengke Zhu, Yantong Chen, Jichen Sun, Shize Zhang, Kaiteng Zuo, Yipan Liu, Xiaolin Chen, Huawei College of Mechanical and Transportation Engineering China University of Petroleum Beijing China Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development Center Mianyang China School of Mechanical Engineering and Automation Beihang University Beijing China School of Mechanical Engineering Hebei University of Science and Technology Shijiazhuang China Institute of Aerospace Special Materials and Processing Technology Beijing China College of Transportation Ludong University Yantai China

Ice accumulation has emerged as a pressing issue, considerably compromising the reliability of equipment. Combining passive slippery and active electrothermal/photothermal surfaces provides a high-efficiency strategy for anti-icing/deicing. However, the transparency and durability of a material still pose substantial limitations on its further application. Herein, a bilayer anti-icing/deicing coating with transparent quasi-solid slippery and electrothermal/photothermal properties is reported. The top transparent photothermal slippery coating (TPSC) is created by embedding graphene nanoparticles, which store oil within a smooth epoxy resin surface, which demonstrates high transparency, stable water-slippery capability, and remarkable photothermal properties. The TPSC remains slippery after being exposed to ultraviolet irradiation and subjected to multiple tape peeling cycles, showing exceptional durability. The TPSC also exhibits excellent photothermal performance at a light transmittance of up to 78%, with its surface temperature reaching approximately 42°C under 1.9-sun illumination. The bottom conductive silver grid layer fabricated using inkjet printing technology gives the surface excellent transparent electrothermal capability for all-day anti-icing/deicing. This multifunctional coating applied to a glass surface effectively prevents icing and simultaneously melts preformed ice and thick frost by applying sunlight and voltage. This work is expected to enlighten the design of next-generation anti-icing/deicing surfaces in various industry fields.

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