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Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

Light(science & Applications) 2024年第1期13卷 13-22页

作者： Surendra B.Anantharaman Jason Lynch Christopher E.Stevens Christopher Munley Chentao Li Jin Hou Hao Zhang Andrew Torma Thomas Darlington Francis Coen Kevin Li Arka Majumdar PJames Schuck Aditya Mohite Hayk Harutyunyan Joshua R.Hendrickson Deep Jariwala Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA19104USA KBR Inc. BeavercreekOH45431USA Air Force Research Laboratory Sensors DirectorateWright-Patterson Air Force BaseOH45433USA Department of Physics University of WashingtonSeattleWA98195USA Department of Physics Emory UniversityAtlantaGA30322USA Department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX77005USA Department of Materials Science and Nanoengineering Rice UniversityHoustonTX77005USA Applied Physics Program Smalley‐Curl InstituteRice UniversityHoustonTX77005USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA98195USA

Excitons,bound electron–hole pairs,in two-dimensional hybrid organic inorganic perovskites(2D HOIPs)are capable of forming hybrid light-matter states known as exciton-polaritons(E–Ps)when the excitonic medium is confined in an optical *** the case of 2D HOIPs,they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the ***,the fundamental properties of these self-hybridized E–Ps in 2D HOIPs,including their role in ultrafast energy and/or charge transfer at interfaces,remain ***,we demonstrate that>0.5µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P *** E–Ps have high Q factors(>100)and modulate the optical dispersion for the crystal to enhance sub-gap absorption and *** varying excitation energy and ultrafast measurements,we also confirm energy transfer from higher energy E–Ps to lower energy E–***,we also demonstrate that E–Ps are capable of charge transport and transfer at *** findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

关键词： charge polar excitation

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Growth behavior of pores and hydrogen desorption behavior in pure aluminum and A6061 aluminum alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第5期73卷 212-217页

作者： Yaegashi, Shono Shimizu, Kazuyuki Kamada, Yasuhiro Toda, Hiroyuki Fujihara, Hiro Uesugi, Masayuki Takeuchi, Akihisa Faculty of Science and Engineering Iwate University 4-3-5 Ueda Morioka-shi Iwate020-8551 Japan Department of Physical Science and Materials Engineering Iwate University Iwate Morioka-shi Japan Department of Mechanical Engineering Kyusyu University Fukuoka Fukuoka-shi Japan Japan Synchrotron Radiation Research Institute Sayo-gun Hyogo Japan

An increase in the volume fraction of pores in aluminum alloys causes a decrease in the elongation and the strength of alloys. To improve the mechanical properties of aluminum alloys, it is important to understand the growth and shrinkage behavior of pores. In this study, we analyzed the relationship between hydrogen desorption behavior and the growth/shrinking behavior of pores in A6061 alloys and pure aluminum using thermal desorption analysis and synchrotron radiation X-ray tomography. In pure aluminum, the fine pores began to annihilate at temperatures above 500°C and the relatively large pores coarsened. In contrast, the pores shrank with increasing temperature in A6061 alloy. The influence of second-phase particles has been discussed as a possible explanation for the difference in the nature of pores at elevated temperatures in pure aluminum and A6061 alloys. As in the A6061 alloy, much of the hydrogen desorbed from the pores due to heating is released externally from the second-phase particles on the aluminum surface, resulting in pore shrinkage due to the internal pressure drop of pores. © 2023 Japan Institute of Light Metals. All rights reserved.

关键词： Aluminum alloys

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Module-level design and characterization of thermoelectric power generator

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Chinese Physics B 2022年第4期31卷 39-47页

作者： Kang Zhu Shengqiang Bai Hee Seok Kim Weishu Liu Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices Southern University of Science and TechnologyShenzhen 518055China The State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Mechanical Engineering School of Engineering&TechnologyUniversity of Washington TacomaTacomaWA 98402USA

Thermoelectric power generation provides us the unique capability to explore the deep space and holds promise for harvesting the waste heat and providing a battery-free power supply for *** past years have witnessed massive progress in thermoelectric materials,while the module-level development is still lagged *** would like to shine some light on the module-level design and characterization of thermoelectric power generators(TEGs).In the module-level design,we review material selection,thermal management,and the determination of structural *** also look into the module-level characterization,with particular attention on the heat flux ***,the challenge in the optimal design and reliable characterization of thermoelectric power generators is discussed,together with a calling to establish a standard test procedure.

关键词： thermoelectric module-level design characterization

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Numerical Modeling of C45 Steel to Predict the Temperature Ranges for Activation of Dynamic Strain Aging at Different Strain Rates 8th

Numerical Modeling of C45 Steel to Predict the Temperature R...

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8th International Conference on Manufacturing, Material and Metallurgical engineering, ICMMME 2024

作者： Hassan, Arhum Abed, Farid Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah26666 United Arab Emirates Department of Civil Engineering American University of Sharjah Sharjah26666 United Arab Emirates

ISBN: (纸本)9783031782947

This work predicts the temperature ranges for dynamic strain aging (DSA) activation in C45 steel at various strain rates through constitutive modeling and finite element (FE) simulations. DSA is often defined by a sudden increase in a metal’s strength when subjected to specific combinations of strain rates and temperatures due to the interaction of the diffused solute atoms with dislocations, and there is currently no effective constitutive model in the literature that can explain DSA physically. The current study offers a modification to the Voyiadjis–Abed (VA) model, which is used to predict DSA activation in C45 steel, in order to address this limitation. The modified constitutive model considers the diffusion kinetics and concentration of solute atom along the dislocation cores. The developed model was able to capture the activation of DSA in C45 steel at strain rates of 0.0015/s-0.15/s and temperature ranges of 500 K-750 K, which was found to be caused by carbon solute atoms. Additionally, FE simulations were carried out in ABAQUS through subroutine coded as VUMAT to validate the modified VA model’s prediction abilities. The results obtained compare effectively with the available experimental data. By integrating physical and microstructural features, the modified constitutive VA model can effectively capture the increase in flow stress due to the activation of DSA. This enables further investigation and progress in understanding the behavior of metals under specified temperature and strain rate conditions. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Digital elevation model

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Design and Dynamic Analysis of a Two-Degree-of-Freedom Pneumatic-Electromagnetic Hybrid Actuator Using Bellows Pneumatic Actuator 49

Design and Dynamic Analysis of a Two-Degree-of-Freedom Pneum...

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49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Heya, Akira Taki, Keita Nakata, Yoshihiro Inoue, Tsuyoshi Hirata, Katsuhiro Nagoya University Department of Mechanical Systems Engineering Nagoya Japan Osaka University Division of Materials and Manufacturing Science Suita Japan The University of Electro-Communications Department of Mechanical and Intelligent Systems Engineering Chofu Japan

ISBN: (纸本)9798350331820

Various actuators have been developed to improve the performance of cooperative robots. Multi-degree-of-freedom (multi-DOF) electromagnetic actuators can rotate multi-DOF by a direct drive and can contribute to system miniaturization and higher precision. However, the biggest challenge is to increase the output because the torque cannot be amplified using a reduction gear. To solve this problem, this paper focuses on a hybrid actuation with a pneumatic actuator, which has a large output density. In this study, we propose a two-DOF pneumatic-electromagnetic hybrid actuator that integrates a bellows pneumatic actuator and a two-DOF electromagnetic actuator. First, the concept, design, and operating principle are presented. Next, the torque control method, dynamic model, and attitude control system are shown. In the torque analysis, the maximum torque of the proposed actuator is four times larger compared with a conventional two-DOF electromagnetic actuator of the same size. The dynamic simulation results show that attitude control is possible with hybrid actuation. Based on the results, a hybrid multi-DOF actuator using multiple drive sources is proposed for the first time. © 2023 IEEE.

关键词： Pneumatic actuators

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Investigation of the cap layer for improved GeSn multiple quantum well laser performance

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Optics Letters 2023年第7期48卷 1626-1629页

作者： Abernathy, Grey Ojo, Solomon Stanchu, Hryhorii Zhou, Yiyin Olorunsola, Oluwatobi Grant, Joshua Du, Wei Jheng, Yue-Tong Chang, Guo-En Li, Baohua Yu, Shui-Qing Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Materials Science & Engineering Program University of Arkansas FayettevilleAR72701 United States Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Department of Mechanical Engineering National Chung Cheng University Chiayi County62102 Taiwan Arktonics LLC 1339 South Pinnacle Drive FayettevilleAR72701 United States

The study of all-group-IV SiGeSn lasers has opened a new avenue to Si-based light sources. SiGeSn heterostructure and quantum well lasers have been successfully demonstrated in the past few years. It has been reported that, for multiple quantum well lasers, the optical confinement factor plays an important role in the net modal gain. In previous studies, adding a cap layer was proposed to increase the optical mode overlap with the active region and thereby improve the optical confinement factor of Fabry–Perot cavity lasers. In this work, SiGeSn/GeSn multiple quantum well (4-well) devices with various cap layer thicknesses, i.e., 0 (no cap), 190, 250, and 290 nm, are grown using a chemical vapor deposition reactor and characterized via optical pumping. While no-cap and thinner-cap devices only show spontaneous emission, the two thicker-cap devices exhibit lasing up to 77 K, with an emission peak at 2440 nm and a threshold of 214 kW/cm2 (250 nm cap device). The clear trend in device performance disclosed in this work provides guidance in device design for electrically injected SiGeSn quantum well lasers. © 2023 Optica Publishing Group.

关键词： Semiconductor quantum wells

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3D porous PTFE membrane filled with PEO-based electrolyte for all solid-state lithium-sulfur batteries

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Rare Metals 2022年第8期41卷 2834-2843页

作者： Zhen-Chao Li Teng-Yu Li Yi-Rui Deng Wen-Hao Tang Xiao-Dong Wang Jin-Lin Yang Qiang Liu Lei Zhang Qiang Wang Rui-Ping Liu Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing100083China School of Materials Science and Engineering Tsinghua UniversityBeijing100083China Department of Mechanical Engineering University of Alaska FairbanksPO Box 755905FairbanksAK99775USA Chongqing Key Laboratory of Green Aviation Energy and Power Chongqing Jiaotong UniversityChongqing401135China

Owing to the low cost and high theoretical energy density,lithium-sulfur battery has become one of the most promising energy storage battery ***,the inherent cycle instability and safety problems of traditional liquid lithium-sulfur batteries greatly limit their commercial *** this work,polytetrafluoroethylene(PTFE)membrane was introduced into Li_(7)La_(3)Zr_(2)O_(12)(LLZO)@poly(ethylene oxide)(PEO)-based composite electrolyte as a supporting framework to prepare a new PTFE@LLZO@PEO composite electrolyte for lithium-sulfur *** introduction of PTFE membrane further improved the mechanical properties and thermal stability of the *** ionic conductivity of the prepared PTFE@LLZO@PEO solid electrolyte was5.03×10^(-5)S·cm^(-1)at 30℃and 2.54×10^(-4)S·cm^(-1)at60℃.Moreover,the symmetric battery exhibited high cycle stability(300 h).The Li-S battery based on PTFE@LLZO@PEO electrolyte exhibited excellent electrochemical performance.

关键词： Lithium-sulfur battery All solid-state battery Composite electrolyte Shuttle effect Lithium dendrite

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Unexpected high-temperature brittleness of a Mg-Gd-Y-Ag alloy

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Journal of Magnesium and Alloys 2022年第9期10卷 2510-2515页

作者： Lirong Xiao Xuefei Chen Huiyan Ning Ping Jiang Yi Liu Bin Chen Dongdi Yin Hao Zhou Yuntian Zhu Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanical and Electrical Engineering Heilongjiang Institute of TechnologyHarbin 150050China ThermoFisher Scientific Shanghai 201210China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuan 610031China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Rare earth(RE)can produce excellent precipitation hardening in Mg ***,when forming a solid solution,it also deteriorates formability,a problem that can usually be overcome by raising deformation *** we report an unexpected observation of high temperature brittleness in a Mg-Gd-Y-Ag *** the temperature reached 500℃,the formability decreased drastically,leading to severe intergranular fracture under only 0.5% *** was caused by failure of grain boundaries,which are weakened by segregated interfacial compounds.

关键词： Interfacial compounds Formability High temperature brittleness Grain boundary sliding

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Unconventional assemblies of bisacylhydrazones:The role of water for circularly polarized luminescence

Aggregate

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Aggregate 2022年第5期3卷 185-193页

作者： Hye Jin Cho Dong Yeun Jeong Hwihyun Moon Taewoo Kim You Kyoung Chung Yeongdong Lee Zonghoon Lee Joonsuk Huh Youngmin You Changsik Song Department of Chemistry Sungkyunkwan UniversitySuwonGyeonggi 16419Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and EngineeringEwha Womans UniversitySeoul 03760Republic of Korea Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Department of Materials Science and EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Understanding the precise molecular arrangement of chiral supramolecular polymers is essential not only to comprehend complex superstructures like proteins and DNA but also for the development of next-generation optoelectronic materials,including materials displaying high-performance circularly polarized luminescence(CPL).Herein,we report the first chiral supramolecular polymer systems based on hydrazone–pyridinium conjugates comprising alkyl chains of different lengths,which afforded control of the apparent supramolecular *** supramolecular chirality is governed basically by the remote chiral centers of alkyl chains,helicity inversion was achieved by controlling the conditions under which the hydrazone building blocks underwent aggregation(i.e.,solvent compositions or temperature).More importantly,the addition of water to the system led to aggregationinduced hydrazone deprotonation,which resulted in a completely different selfassembly *** water molecules played an essential role,forming the assembly’s channel-like backbone,around which hydrazone molecules gathered as a result of hydrogen bonding *** co-assembly of an achiral hydrazone luminophore with the given supramolecular polymer system allowed the fabrication of a novel CPL-active hydrazone-based material exhibiting a high maximum value for the photoluminescence dissymmetry factor of -2.6×10^(-2).

关键词： circularly polarized luminescence(CPL) helicity control hydrazone self-assembly structural water supramolecular polymerization

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Self-deploying amorphous metal origami structures for environmental protection of lunar payloads

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International Journal of Space Structures 2023年第3期38卷 204-213页

作者： Oropeza, Daniel McMahan, Connor Hofmann, Douglas C Engineering and Science Directorate NASA Jet Propulsion Laboratory California Institute of Technology PasadenaCA United States Department of Materials University of California Santa BarbaraCA United States Department of Mechanical and Civil Engineering California Institute of Technology PasadenaCA United States

The development of small subterranean deployable structures provides a novel methodology for thermal insulation and radiation protection of scientific payloads for future lunar missions. This work showcases the fabrication and characterization of an origami-inspired self-deploying dome fabricated from amorphous metal foil, taking advantage of the high elastic strain limit of amorphous metals to store energy for deployment in the foil folds when the structure is in the stored configuration. Experiments are performed to understand the influence of material selection on stored energy and springback. A cylindrical structure is fabricated to develop a simulation model for origami-inspired amorphous metal structures and probe the structural integrity of amorphous metal foil structures during repeated loading cycles. Finally, a prototype deployable dome structure is manufactured to showcase the self-deployment strategy and investigate deformation under a simulated lunar regolith load. © The Author(s) 2023.

关键词： Strain

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