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Superacid assisted high-throughput production and solution-processing of pristine two-dimensional materials

Materials Today 2025年 86卷 228-237页

作者： Deng, Qixuan Ma, Jiabin Liu, Minsu Zhou, Yicong Ding, Siyuan Zhan, Ke Zhu, Yuan Xiong, Zhiyuan Su, Yang Yu, Kuang Cheng, Hui-Ming Qiu, Ling Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Department of Materials Science and Engineering Monash University VIC3800 Australia Monash Suzhou Research Institute Monash University Suzhou Suzhou SIP215000 China School of Microelectronics Southern University of Science and Technology Shenzhen518055 China School of Light Industry and Engineering South China University of Technology Guangzhou510640 China Shenzhen Key Lab of Energy Materials for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences 1068 Xueyuan Road Shenzhen518055 China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced Technology 291 Louming Road Shenzhen518107 China

Pristine two-dimensional (2D) materials have a multitude of interesting properties, promising a broad spectrum of applications. However, their poor affinity for common solvents and tendency to aggregate impede their effective exfoliation and solution-processing into various structures, such as fibers and membranes, thus limiting their practical use. We report a high-efficiency method for producing pristine 2D nanosheets by direct high-speed shearing exfoliation in trifluoromethanesulfonic acid (TfOH). Typically, this method produces hexagonal boron nitride nanosheets (BNNSs) with an unprecedented throughput of 38.8 mg mL-1h−1. The effective exfoliation is attributed to the strong binding affinity, large dipole moment and steric repulsion of TfOH, which collectively introduce layer edge distortion in hexagonal boron nitride (hBN), facilitating its exfoliation. The mechanical exfoliation and reversible edge interaction introduce no additional functional groups to the exfoliated BNNSs. The resulting pristine BNNS exhibit remarkable stability in TfOH solutions at ultrahigh concentrations of 200 mg mL−1 for over 28 days. The viscosity of the highly concentrated BNNS/TfOH dispersion can be adjusted, enabling techniques to produce BNNS-based spheres, fibers, and membranes with high thermal conductivity and mechanical strength, suitable for advanced thermal management applications. Room temperature processed BNNS-based spheres exhibit superior thermal conductivity compared to high temperature processed commercially available hBN or Al2O3 spheres. Moreover, TfOH can also be used to assist the efficient production and solution-processing of other 2D nanosheets, including graphene, molybdenum disulfide and tungsten disulfide, enabling the fabrication of high-quality bulk assemblies. © 2025 Elsevier Ltd

关键词： Molybdenum disulfide

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Hierarchical Motion Field Alignment for Robust Optical Flow Estimation

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Sensors 2025年第9期25卷 2653-2653页

作者： Ma, Dianbo Imamura, Kousuke Gao, Ziyan Wang, Xiangjie Yamane, Satoshi Graduate School of Natural Science and Technology Kanazawa University Kanazawa9201192 Japan School of Information Science Japan Advanced Institute of Science and Technology Nomi9231292 Japan State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China

Optical flow estimation is a fundamental and long-standing task in computer vision, facilitating the understanding of motion within visual scenes. In this study, we aim to improve optical flow estimation, particularly in challenging scenarios involving small and fast-moving objects. Specifically, we proposed a learning-based model incorporating two key components: the Hierarchical Motion Field Alignment module, which ensures accurate estimation of objects of varying sizes while maintaining manageable computational complexity, and the Correlation Self-Attention module, which effectively handles large displacements, making the model suitable for scenarios with fast-moving objects. Additionally, we introduced a Multi-Scale Correlation Search layer to enhance the four-dimensional cost volume, enabling the model to address various types of motion. Experimental results demonstrate that our model achieves superior generalization performance and significantly improves the estimation of small, fast-moving objects. © 2025 by the authors.

关键词： Motion estimation

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Fatigue Life Extension of Laser Shock Peened 7050 Aluminum Alloy Manufactured Fillet Structures 9

Fatigue Life Extension of Laser Shock Peened 7050 Aluminum A...

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9th International Conference on Surface Engineering, ICSE 2024

作者： Shuai, Shixiang Jiang, Angran Che, Zhigang Lei, Fan Sun, Rujian Co. Ltd. Chengdu610091 China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China

Laser shock peening (LSP) represents an advanced manufacturing method for surface strain strengthening and anti-fatigue production. In this study, laser shock peening (LSP) was employed to treat fillet structures made from 7050 aluminium alloy. Residual stress distribution and high cycle fatigue performance were investigated by numerical simulation and experiment, respectively. Further, fatigue life extension was verified with mathematical statistics methods. Results show that by utilizing the following LSP parameters: pulse energy of 25 J, spot size of Φ4.5 mm, overlapping rate of 50%, and peening twice, the average compressive residual stress on the fillet structure surface reached 218.3 MPa, the maximum residual stress in the depth direction located at a depth of 0.9 mm, and the thickness of residual stress affecting layer was 1.6 mm. Besides, the high cycle fatigue life significantly improved after LSP. The mean high-cycle fatigue life of the LSP-treated side was 160,626 cycles, in comparison to 58,606 cycles for the BM side. Furthermore, the t-test method of paired comparative experiments demonstrated that the high-cycle fatigue life of the LSP-treated side was 2.18 to 3.36 times higher than that of the BM side at the 95% confidence level. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Aluminum alloys

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Advances in Metal Halide Perovskite Scintillators for X-Ray Detection

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Nano-Micro Letters 2025年第1期17卷 1-38页

作者： Wang, Ting Zeng, Guoqiang Yang, Yang Michael Yang, Zhi Wang, Tianchi Li, Hao Han, Lulu Yu, Xue Xu, Xuhui Ouyang, Xiaoping College of Materials and Chemistry & Chemical Engineering Nuclear Technology Key Laboratory of Earth Science Chengdu University of Technology Chengdu People’s Republic of China Nuclear Technology Key Laboratory of Earth Science Chengdu University of Technology Chengdu People’s Republic of China State Key Laboratory of Modern Optical Instrumentation Institute for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou People’s Republic of China Key Laboratory of Materials Physics of Ministry of Education Laboratory of Zhongyuan Light School of Physics Zhengzhou University Zhengzhou People’s Republic of China Faculty of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Kunming People’s Republic of China School of Mechanical Engineering Institute for Advanced Materials Chengdu University Chengdu People’s Republic of China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an People’s Republic of China

The relentless pursuit of advanced X-ray detection technologies has been significantly bolstered by the emergence of metal halides perovskites (MHPs) and their derivatives, which possess remarkable light yield and X-ray sensitivity. This comprehensive review delves into cutting-edge approaches for optimizing MHP scintillators performances by enhancing intrinsic physical properties and employing engineering radioluminescent (RL) light strategies, underscoring their potential for developing materials with superior high-resolution X-ray detection and imaging capabilities. We initially explore into recent research focused on strategies to effectively engineer the intrinsic physical properties of MHP scintillators, including light yield and response times. Additionally, we explore innovative engineering strategies involving stacked structures, waveguide effects, chiral circularly polarized luminescence, increased transparency, and the fabrication of flexile MHP scintillators, all of which effectively manage the RL light to achieve high-resolution and high-contrast X-ray imaging. Finally, we provide a roadmap for advancing next-generation MHP scintillators, highlighting their transformative potential in high-performance X-ray detection systems.

关键词： Engineering strategies Metal halide perovskites Radioluminescence properties Scintillators X-ray detection

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Effect of CNT content on microstructure and tribological properties of CNTs/AlSi10Mg composites by LPBF

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China Foundry 2025年 1-10页

作者： Jiang, Li-Yi Shen, Chao-Yi Liu, Ting-Ting Zhang, Chang-Dong Su, Xiang Xu, Wei-Wei Wang, Bo-Xiang Qi, Zhi-Xiang Liao, Wen-He School of Mechanical Engineering Nanjing Institute of Technology Nanjing 211167 China National Joint Engineering Research Center of NC forming technology and equipment School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China Jiangsu Belight Laboratory State Key Laboratory of Advanced Casting Technologies Nanjing University of Science and Technology Nanjing 210094 China School of Aviation and Mechanical Engineering Changzhou Institute of Technology Jiangsu Changzhou 213032 China

In this study, carbon nanotubes (CNTs)/AlSi10Mg composite parts with CNTs contents ranging from 0.0 to 2.0wt.% were successfully fabricated via laser powder bed fusion (LPBF) with laser scan speeds ranging from 900 to 1,900 mm·s−1. Uniform dispersion of CNTs in the powders can be achieved when their content is below 2.0wt.%. In the LPBF samples, the morphology of the CNTs is found to be directly related to their content. Especially, the length of CNTs in samples prepared by LPBF increases as the CNT content increases. The length of CNTs is approximately 200–300 nm in the 1.0wt.% CNTs/AlSi10Mg composites and approximately 500–1,000 nm in the 2.0wt.% CNTs/AlSi10Mg composites. The hardness of the composites reaches its highest value of 143.3 HV when the CNTs content is 1.0wt.% and the laser scan speed is 1,300 mm·s−1. It is found that the self-lubricating properties of the CNTs improve the tribological properties of the composites. The coefficient of friction (CoF) and wear rate of the samples decrease with increasing CNT content. At a CNTs content of 2.0wt.%, the CoF and wear rate of the composite decrease by approximately 14% and 30%, respectively, compared to the unreinforced matrix. The presence of CNTs leads to a more complete and refined network microstructure within the samples. Both the CNTs and the aluminum carbide contribute to the Orowan mechanism and the Hall-Petch effect within the matrix. © Foundry Journal Agency 2025.

关键词： A aluminum matrix composites carbon nanotubes (CNTs) coefficient of friction (CoF) hardness laser powder bed fusion (LPBF) TG146.21

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Study on the thinning characteristics of aviation tubes during bending forming under boundary lubrication friction

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Journal of Manufacturing Processes 2025年 149卷 443-455页

作者： Yu Wu Zhineng Wang Jing Tian Renzhen Chen Weiming Lin Yaochen Lin Health Maintenance for Mechanical Equipment Key Lab Hunan University of Science and Technology Xiangtan 411201 China Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System Shenyang Aerospace University Shenyang 110136 China Zhejiang King-Mazon Intelligent Manufacturing Corp. Ltd Lijiang 321400 China

The reduction of wall thickness during the bending forming process of aviation tubes is a common issue, particularly for large-diameter, thick-walled tubes. Under heavy load conditions, the lubrication state deteriorates, leading to a boundary lubrication state that complicates the prediction of wall thickness reduction. Current research on tube bending forming relies on Coulomb friction, which does not accurately reflect real-world conditions. Therefore, we propose a method for analysing tube thinning during bending forming that considers the friction characteristics of boundary lubrication. ABAQUS/VFRIC was employed to develop a dynamic friction model that considers contact pressure. Additionally, material hardness and RMS roughness were incorporated into the finite element simulation. Results show that as the tubing advances, the contact area between the pressure die and the tube changes and the friction between them generates a certain amount of compressive stress. An increase in contact pressure results in a higher friction coefficient, leading to a substantial rise in the tensile stress on the tube's exterior, further aggravating the thinning of the outer wall. In particular, stress concentrations and elevated strains resulting from boundary lubrication friction are especially pronounced at the 40° and 60° bending positions. In addition, increased RMS roughness and decreased material hardness contribute to more significant thinning effects. Experimental verification indicates that this dynamic friction model offers greater accuracy than the traditional Coulomb friction model in predicting wall thickness thinning, achieving a maximum error reduction to 3% and an accuracy enhancement of 7%. The findings provide theoretical support for process optimisation in aerospace manufacturing and establish a foundation for designing and implementing high-precision forming processes.

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Laser shock peening without coating induces deeper surface integrity changes in Ti60 than mechanical shot peening

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Optics and Laser technology 2025年 189卷

作者： Yao, Yuan Lin, Xiaojing Zhao, Di Lu, Guoxin Attard, Bonnie Rochman, Arif Wang, Qiang Ji, Zhong Cassar, Glenn Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education School of Materials Science and Engineering Shandong University Shandong Jinan250061 China Institute of Engineering & Transport MCAST PLA 9032 Malta Faculty of Engineering University of Malta MSD 2080 Malta Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing100095 China

Laser shock peening (LSP) is widely recognized for enhancing surface properties such as fatigue and wear resistance. LSP without coating (LSPwC) has emerged as an attractive alternative that eliminates the need for protective coatings, simplifies processing steps, and reduces costs. However, the comparative advantages of LSPwC and conventional mechanical shot peening (SP) for titanium alloy surface enhancement remain unclear. In this study, the effects of SP and LSPwC on the residual stress distribution and deformation characteristics of Ti60 alloy are systematically compared. The results reveal that although SP generates a higher maximum compressive residual stress (−549 MPa) than LSPwC (−392 MPa), it produces a shallower compressive layer (280 μm vs. 370 μm). Analysis of the full-width at half maximum (FWHM) indicates distinct stress profiles: SP induces the most severe elastoplastic deformation at ∼50 μm depth, accompanied by a non-monotonic stress distribution, whereas LSPwC primarily affects the outermost surface. Moreover, SP provides stronger surface strengthening within ∼150 μm depth, while LSPwC—due to its lower energy input—achieves a deeper compressive residual stress layer. These findings enhance the understanding of SP and LSPwC mechanisms, providing critical insights for optimizing surface processes in industrial applications. © 2025 Elsevier Ltd

关键词： Shot peening

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Nonlinear multi-point impacts of the bi-stable functional gradient magneto-electro-elastic plate: Interaction analysis and active control strategy based on bistable configuration

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Communications in Nonlinear science and Numerical simulation 2025年 148卷

作者： Li, Lizhi Ren, Yiru Nie, Lu State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Hunan Changsha410082 China College of Mechanical and Vehicle Engineering Hunan University Hunan Changsha410082 China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of Education Hunan University Hunan Changsha410082 China China Academy of Aerospace Science and Innovation Beijing 100086 China

Revealing the coupling correlations between stiffness nonlinearity and magneto-electro-mechanical effect in multi-point impacts contributes significantly to the advancement of intelligent morphing structures. Multi-point impact responses and active control of bi-stable functional gradient magneto-electro-elastic (FG-MEE) plates are investigated, focusing on influence mechanism of the active control performance and the bi-stable characteristics. Based on the Reddy high-order shear plate theory model, the nonlinear geometric relationship considering the bi-stable configuration is established, and the multi-point impact model is extended. To achieve efficient structural design in multi-point impacts, the active control strategy in multi-physics fields is introduced. In the multi-physical field, the nonlinear dynamic model for multi-point impact involving the bi-stable functionally graded magneto-electro-elastic plate is established. The expanded two-step perturbation method is proposed to solve the bi-stable configuration driven by the magneto-electro-mechanical effect. To obtain the approximate solution for the multi-point impact of the bi-stable FG-MEE plate, the extended two-step perturbation method-Galerkin method is further developed to the higher-order form. Ultimately, coupling correlations between stiffness nonlinearity and magneto-electro-mechanical effect in the multi-point impacts are systematically revealed, and the active control performance is evaluated under the influence of multi-point impact. © 2025 Elsevier B.V.

关键词： Galerkin methods

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Influence of n = 1 resonant magnetic perturbation on flow and turbulence towards L-H transition

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Nuclear Fusion 2025年第6期65卷

作者： Zhang, Y. Jiang, M. Guo, Z.B. Diamond, P.H. Guo, W.X. Xu, J.Q. Zhang, N. Wang, Z. Li, Z.J. Zhou, Y. Liang, A.S. Sun, T.F. Ke, R. Gong, S.B. He, X.X. Chen, W. Zhong, W.L. Southwestern Institute of Physics PO Box 432 Chengdu610041 China State Key Laboratory of Nuclear Physics and Technology Fusion Simulation Center School of Physics Peking University Beijing100871 China University of California San Diego San DiegoCA92093 United States International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electric and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

The application of resonant magnetic perturbation (RMP) with toroidal mode number n = 1 on HL-3 tokamak inhibits the L-H transition at specific heating power. Following RMP application, the electron density increases in the outer plasma region (ρ > 0.85, where ρ is the normalized toroidal flux), while the electron/ion temperature decreases. Notably, the equilibrium flow shear in the edge region is substantially reduced. This reduction, combined with enhanced micro-instabilities driven by increased profile gradients, leads to enhanced turbulence levels. Consequently, the diminished flow shear becomes less effective in suppressing turbulence, providing a comprehensive explanation for the inhibited access to H-mode. Through a modified one-dimensional predator-prey model that incorporates the effects of RMP-induced radial magnetic perturbations, we have conducted a quantitative analysis of the turbulence and flow dynamics during the L-H transition process. Our results indicate that as the strength of magnetic perturbation increases, the turbulence intensity increases and edge flow shear decreases, in agreement with experimental observations. Additionally, we found that the L-H transition power threshold increases almost linearly with the square of the radial magnetic perturbation intensity. These results enhance our understanding of RMP-induced changes in edge plasma transport, providing valuable insights for optimizing the operation of future tokamaks and improving the performance of fusion reactors. © 2025 The Author(s). Published by IOP Publishing Ltd on behalf of the IAEA.

关键词： Tokamak devices

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First-principles study of the Pr-doped bilayer nickelate La3Ni2O7

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Physical Review B 2025年第19期111卷 195118-195118页

作者： Zihao Huo Peng Zhang Haoliang Shi Xiaochun Yan Defang Duan Tian Cui Key Laboratory of Material Simulation Methods and Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University Xi'an 710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo 315211 China

Recently, the Pr-doped Ruddlesden-Popper (RP) phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and a superconducting volume fraction of about 57% at high pressure. However, the effect of Pr doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and the high-pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may reduce the required pressure for the superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide a helpful guide for understanding the effect of chemical pressure in an isovalent-doped RP phase nickelate superconductor.

关键词： Crystal atomic structure

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