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Temperature-mediated tribological characteristics of 40CrNiMoA steel and Inconel 718 alloy during sliding against Si_(3)N_(4) counterparts

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Friction 2021年第5期9卷 1175-1197页

作者： Liuyang BAI Shanhong WAN Gewen YI Yu SHAN Sang The PHAM Anh Kiet TIEU Yan LI Rendong WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Opto-Electronics Engineering University of Chinese Academy of SciencesBeijing 100049China Faculty of Engineering and Information Sciences University of WollongongWollongong 2522Australia State Key Laboratory of Metal Materials for Marine Equipment and Application Anshan 114009China Ansteel Iron&Steel Research Institute Anshan 114009China

A comparative evaluation of the friction and wear behaviors of 40CrNiMoA steel and Inconel 718 alloy sliding against Si_(3)N_(4) counterparts was conducted over a large temperature range from room temperature(RT)to 800℃.The temperature‐dependent tribological properties associated with the resulting chemical mitigation and structural adaptation of the solid sliding surface were clarified by surface/interface *** results revealed desirable performance in reducing friction and wear at elevated temperatures,which was associated with the resulting oxide composite filmʹs adaptive lubricating capability,whereas severe abrasive wear occurred at room/ambient *** oxidative‐abrasive differentials for the two alloys were further discussed by considering the combined effect of temperature and stressed‐shearing conditions.

关键词： steel alloys high‐temperature tribology wear and friction oxidation surface/interface chemistry

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Deployable Nanoelectromechanical Bound states in the Continuum Enabled by GHz Lamb Wave Phononic Crystals on LiNbO3 Thin Films

arXiv

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arXiv 2025年

作者： Liang, Sheng-Nan Qin, Zhen-Hui Wu, Shu-Mao Chen, Hua-Yang Yu, Si-Yuan Chen, Yan-Feng National Laboratory of Solid-State Microstructures Department of Materials Science and Engineering Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing210093 China

Bound states in the continuum (BICs) are a fascinating class of eigenstates that trap energy within the continuum, enabling breakthroughs in ultra-low-threshold lasing, high-Q sensing, and advanced wave-matter interactions. However, their stringent symmetry requirements hinder practical integration, especially in acoustic and electromechanical systems where efficient mode excitation is challenging. Here, we demonstrate deployable nanoelectromechanical quasi-BICs on suspended lithium niobate (LiNbO3) thin films, enabled by nanoscale Lamb wave phononic crystals (PnCs) operating at gigahertz frequencies. By exploiting the decoupling of symmetric (S) and antisymmetric (A) Lamb wave modes, we create a robust framework for BICs. Controlled mirror symmetry breaking induces targeted coupling between the S and A modes, resulting in quasi-BICs that preserve high-Q characteristics and can be excited by traveling waves, eliminating the need for specialized excitation schemes. Our approach enables the multiplexing of quasi-BIC resonators along a single transmission line, each corresponding to a unique frequency and spatial position. This work presents a scalable route for the on-chip integration of BICs, bridging the gap between theoretical concepts and practical nanoelectromechanical devices, and opening new avenues in advanced signal processing, high-precision sensing, and quantum acoustics. Copyright © 2025, The Authors. All rights reserved.

关键词： Phonons

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Width-independent and Robust Multimode Interference Waveguides Based on Anomalous Bulk states

arXiv

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arXiv 2024年

作者： Liu, Lei Zhang, Xiujuan Lu, Ming-Hui Chen, Yan-Feng National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University Nanjing210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Multimode interference (MMI) is a fundamental physical principle that plays a crucial role in modern communication technologies for wave splitting, filtering, switching and multiplexing. Typically, the generation of multimodes is highly dependent on the waveguide’s cross-section, particularly its width, by which the mode profiles and the interference patterns can be severely affected, leading to unstable MMI performance. Here, we realize width-independent and robust MMI waveguides. Our principle is based on the unique properties of multilayer graphene lattices. By properly modulating the boundary potential, this Dirac-type material supports anomalous bulk states with uniform wavefunctions independent of the sample size. Benefited from such an anomaly, the bulk states in a waveguide formed by multiple layers of graphene ribbons exhibit width-independent MMI. Enabled by this intriguing characterisitc, we construct 2x2 MMI waveguides using bilayer photonic and phononic crystals with graphene lattices. By precisely modulating their boundaries, the anomalous bulk states and correspondingly the width-independent MMI are achieved. Our experimental measurements show that the input wave energy travelling through the MMI waveguide can be split into two outputs with a frequency-tunable ratio, and due to the width-independent characteristic, the splitter is robust to geometric perturbations. We further demonstrate stable MMI across multiple interconnects with stepped widths, allowing for high power capacity while maintaining high coupling efficiency. Our approach successfully decouples MMI performance from waveguide width, creating lateral degrees of freedom that enable flexibly scalable and robust photonic, phononic, and electronic integrated circuits for versatile MMI applications. © 2024, CC BY.

关键词： Photonics

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Synergy between Spin and Orbital Angular Momenta on a Möbius Strip

arXiv

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arXiv 2024年

作者： Liu, Lei Sun, Xiao-Chen Tian, Yuan Zhang, Xiujuan Lu, Ming-Hui Chen, Yan-Feng National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University Nanjing210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Spin and orbital angular momenta are fundamental physical characteristics described by polarization and spatial degrees of freedom, respectively. Polarization is a feature of vector fields while spatial phase gradient determines the orbital angular momentum ubiquitous to any scalar field. Common wisdom treats these two degrees of freedom as distinct and independent principles to manipulate wave propagations. Here, we demonstrate their synergy. This is achieved by introducing two orthogonal p-orbitals as eigenbases, whose spatial modal features are exploited to generate orbital angular momenta and the associated orbital orientations provide means to simultaneously manipulate polarizations. Through periodic modulation and directional coupling, we realize a full cyclic evolution of the synchronized and synergized spin-orbital angular momenta. Remarkably, this evolution acquires a nontrivial geometric phase, leading to its representation on a Möbius strip. Experimentally, an acoustic cavity array is designed, whose dipole resonances precisely mimic the p-orbitals. The acoustic waves, uniquely, see the pressure (scalar) field as a spatial feature and carry an intrinsic polarization defined by the velocity (vector) field, serving as an ideal platform to observe the synergy of spin and orbital angular momenta. Based on such a property, we further showcase a spin-orbital-Hall effect, highlighting the intricate locking of handedness, directionality, spin density and spatial mode profile. Our study unveils a fundamental connection between spin and orbital angular momenta, promising avenues for novel applications in information coding and high-capacity communications. © 2024, CC BY.

关键词： Polarization

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Spatiotemporal Acoustic Vortex Beams with Transverse Orbital Angular Momentum

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Physical Review Letters 2023年第1期131卷 014001-014001页

作者： Hao Ge Shuai Liu Xiang-Yuan Xu Zi-Wei Long Yuan Tian Xiao-Ping Liu Ming-Hui Lu Yan-Feng Chen National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering Nanjing University Nanjing Jiangsu 210093 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing Jiangsu 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

Recently, the discovery of optical spatiotemporal (ST) vortex beams with transverse orbital angular momentum (OAM) has attracted increasing attention and is expected to extend the research scope and open new opportunities for practical applications of OAM states. The ST vortex beams are also applicable to other physical fields that involve wave phenomena, and here we develop the ST vortex concept in the field of acoustics and report the generation of Bessel-type ST acoustic vortex beams. The ST vortex beams are fully characterized using the scalar approach for the pressure field and the vector approach for the velocity field. We further investigate the transverse spreading effect and construct ST vortex beams with an ellipse-shaped spectrum to reduce the spreading effect. We also experimentally demonstrated the orthogonality relations between ST vortex beams with different charges. Our study successfully demonstrates the versatility of the acoustic system for exploring and discovering spatiotemporally structured waves, inspiring further investigation of exotic wave physics.

关键词： Acoustic measurements Acoustic wave phenomena

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Strain-tunable magnetic compensation temperature of epitaxial Tb3Fe5O12 thin films

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Physical Review B 2023年第18期108卷 184403-184403页

作者： Yufei Li Xihui Yang Hua Bai Mingzhi Wang Dashuai Cheng Cheng Song Zhe Yuan Yi Liu Zhong Shi Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology and Pohl Institute of Solid State Physics and School of Physics Science and Engineering Tongji University Shanghai 200092 China Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Key Laboratory of Advanced Materials School of Materials Science and Engineering Beijing Innovation Center for Future Chips Tsinghua University Beijing 100084 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China

High-quality rare-earth iron garnet (ReIG) Tb3Fe5O12 (TbIG) thin films are epitaxially grown on a series of (111)-oriented garnet substrates with various lattice constants. The coherent growth induces a substrate-dependent in-plane tensile or compressive strain in the TbIG film. Measurements of the anomalous Hall-like effect in TbIG/Pt heterostructures show that the compensation temperature of TbIG films monotonically changes with the film strain. The strain results in a variation of the distances between magnetic atoms in the TbIG crystal and therefore the corresponding exchange interactions. The latter is explicitly calculated as a function of the lattice strain based on density-functional theory, reproducing the observed experimental results. This work provides a versatile way to optimize ReIG-based spin-orbit torque devices.

关键词： Anomalous Hall effect Epitaxial strain Exchange interaction Ferrimagnetism Magnetoelastic effect

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Bilayer interfacial engineering with PEAI/OAI for synergistic defect passivation in high-performance perovskite solar cells

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Journal of Semiconductors 2025年第5期 116-125页

作者： Chentai Cao Yuli Tao Quan Yang Hai Yu Yonggang Chen Qiangqiang Meng Jiajiu Ye Xu Pan School of Physics and Materials Engineering Hefei Normal University Institute of Solid-State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences University of Science and Technology of China Jianghuai Advanced Technology Center

Interfacial defects and environmental instability at perovskite surfaces pose significant challenges for inverted perovskite solar cells（PSCs）. Surface post-treatment strategies have emerged as a viable approach to improve film quality and passivate defects. Although organic molecules can passivate both surfaces and grain boundaries via hydrogen or covalent bonding,their limited adsorption specificity often results in incomplete defect neutralization. In this work, we introduce a bilayer passivation approach employing phenethylammonium iodide（PEAI） and n-octylammonium iodide（OAI） to concurrently mitigate nonradiative recombination and improve stability. PEAI passivates undercoordinated Pb2+at grain boundaries and surfaces, effectively eliminating deep-level traps and suppressing non-radiative losses. Meanwhile, OAI forms a hydrophobic barrier on the perovskite surface through its long alkyl chains, inhibiting moisture penetration without compromising interfacial charge transport. As a result, the perovskite film exhibits significantly enhanced optoelectronic performance and environmental stability,achieving a champion power conversion efficiency（PCE） of 24.48%.

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Correction:Advanced Janus Membrane with Directional Sweat Transport and Integrated Passive Cooling for Personal Thermal and Moisture Management

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Advanced Fiber materials 2024年第6期6卷 1995-1996页

作者： Peng Yang Yanshan Ju Jiajun He Zhengcai Xia Liang Chen Shaochun Tang National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences Nanjing University Nanjing 210093 Jiangsu People’s Republic of China School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan 430074 Hubei People’s Republic of China

关键词

关键词： Directional water transport Evaporative cooling Radiative cooling Surface wettability Thermal and moisture management

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Atomically Precise Metal Nanoclusters as Single Electron Transferers for Hydroborylation

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Precision Chemistry 2023年第3期1卷 175-182页

作者： Wanli Zhu Sheng Zhang Weigang Fan Ying Yang Hongliang Zhao Wenwen Fei Hong Bi Jian He Man-Bo Li Zhikun Wu Institute of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230601P.R.China Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031P.R.China College of Materials and Chemical Engineering West Anhui UniversityLu’anAnhui 237015P.R.China School of Material Science and Engineering Anhui UniversityHefeiAnhui 230601P.R.China Department of Chemistry and State Key Laboratory of Synthetic Chemistry The University of Hong KongHong KongP.R.China

The emergence of metal nanoclusters with atomically precise compositions and structures provides an opportunity for in-depth investigation of catalysis mechanisms and structure−property correlations at the ***,a serious problem for metal nanocluster catalysts is that the ligands inhibit the catalytic activity through deactivating the surface of the ***,we introduce a novel catalytic mode for metal nanoclusters,in which the nanoclusters initiate the catalysis via single electron transfer(SET)without destroying the integrity of nanoclusters,providing a solution for the contradiction between activity and stability of metal *** illustrated that the novel activation mode featured low catalyst loading(0.01 mol%),high TOF,mild reaction conditions,and easy recycling of catalyst in alkyne hydroborylation,which often suffered from poor selectivity,low functional group tolerance,***,the catalyst[Au_(1)Cu_(14)(TBBT)_(12)(PPh_(3))_(6)]^(+)(TBBTH:p-tert-butylthiophenol)can be applied in highly efficient tandem processes such as hydroborylation−deuteration and hydroborylation−isomerization,demonstrating the utility of the introduced activation mode for metal nanoclusters.

关键词： atomically precise metal nanocluster single electron transfer hydroborylation boryl radical tandem catalysis

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In-situ/operando characterization techniques in lithium-ion batteries and beyond

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Journal of Energy Chemistry 2021年第8期30卷 191-211,I0005页

作者： Haoyu Li Shaohua Guo Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructureNanjing UniversityNanjing 210093China Shenzhen Research Institute of Nanjing University Shenzhen 51800China National Institute of Advanced Industrial Science and Technology(AIST) Umezono 1-1-1TsukubaJapan

Nowadays,in-situ/operando characterization becomes one of the most powerful as well as available means to monitor intricate reactions and investigate energy-storage mechanisms within advanced *** new applications and novel devices constructed in recent years are necessary to be reviewed for inspiring subsequent ***,we summarize the progress of in-situ/operando techniques employed in rechargeable *** members of this large family are divided into three sections for introduction,including bulk material,electrolyte/electrode interface and gas *** each part,various energy-storage systems are mentioned and the related experimental details as well as data analysis are *** simultaneous strategies of various in-situ methods are highlighted as ***,current challenges and potential solutions are concluded towards the rising influence and enlarged appliance of in-situ/operando techniques in the battery research.

关键词： In-situ/operando Characterization techniques Secondary batteries

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