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Ultra-slim electrostrains with superior temperature-stability in leadfree sodium niobate-based ferroelectric perovskite

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Journal of Materiomics 2022年第6期8卷 1230-1238页

作者： Ruiyi Jing Qingyuan Hu Leiyang Zhang Yuan Sun Jiagang Wu D.O.Alikin V.Ya Shur Xiaoyong Wei Hongliang Du Yunfei Chang Li Jin Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an710049China Functional Materials and Acousto-Optic Instruments Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China Department of Materials Science Sichuan UniversityChengdu610065China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg620000Russia Multifunctional Electronic Ceramics Laboratory College of EngineeringXi'an International UniversityXi'an710077China

Large electrostrains with high temperature stability and low hysteresis are essential for applications in high-precision actuator ***,achieving simultaneously all three of the aforementioned features in ferroelectric ceramics remains a considerable *** this work,we firstly report a high unipolar electrostrain(0.12%at 60 kV/cm)in(1ex)NaNbO_(3)-x[(Ba0.85Ca0.15)(Zr_(0.1)Ti_(0.9))O_(3)](NN-xBCZT)ferroelectric polycrystalline ceramics with excellent thermal stability(variation less than 10%in the temperature range of 30-160℃)and ultra-low hysteresis(<6%).Secondly,the high-field electrostrain response is dominated by the intrinsic electrostrictive effect,which may account for more than 80%of the ***,due to the thermal stability of the polarization in the pure tetragonal phase,the large electrostrain demonstrates extraordinarily high stability from room temperature to 140℃.Finally,in-situ piezoelectric force microscopy reveals ultra-highly stable domain structures,which also guarantee the thermal stability of the electrostrain in(NN-xBCZT ferroelectrics *** study not only clarifies the origin of thermally stable electrostrain in NN-xBCZT ferroelectric perovskite in terms of electrostrictive effect,but also provides ideas for developing applicable ferroelectric ceramic materials used in actuator devices with excellent thermal stability.

关键词： Electrostrain Electrostriction NaNbO_(3) Polarization

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"Nano-fishnet" shaped PCL/PU-based composite membrane as superhydrophobic oil-water separator

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Separation and Purification Technology 2025年 359卷

作者： Chen, Hongli Zhang, Haiyan Zhang, Ye Song, Wenjing Sun, Zhuoran Li, Lili Key Laboratory of Automobile Materials Ministry of Education and College of Materials Science and Engineering Jilin University Changchun130022 China Jilin Jia De Sky Environment Technology Co. Ltd. Jilin132000 China

Nowadays, there is a growing interest in the development of eco-friendly oil-water separation membranes with selective wettability. However, the poor mechanical property often limits their applications. Herein an environmentally friendly polycaprolactone/polyurethane-based composite membrane (PCL/PU4@PDA@SA) was prepared by coaxial electrospinning. The PCL/PU4@PDA@SA was ingeniously designed with PCL distributed in fibers and PU produced in the nodule of "nano-fishnet". The PCL fibers bonded by PU had good mechanical properties and excellent stability. The "nano-fishnet" combining SA with low surface energy endowed the superhydrophobicity of PCL/PU4@PDA@SA surface. Due to its multi-stage pore structure, the PCL/PU4@PDA@SA demonstrated superior efficiency in oil-water separation. Even after 10 cycles, the separation efficiency was still higher than 99.54%. Additionally, the PCL/PU4@PDA@SA membrane had good self-cleaning performance, friction durability, and chemical stability. This research highlighted a way to design a sustainable separator with controllable composition distribution and morphology. © 2024 Elsevier B.V.

关键词： Composite membranes

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ROS-responsive biomimetic nanoparticles for potential application in targeted anti-atherosclerosis

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Regenerative Biomaterials 2021年第4期8卷 97-106页

作者： Dan Tang Yi Wang Andy Wijaya Boyan Liu Ali Maruf Jinxuan Wang Jianxiong Xu Xiaoling Liao Wei Wu Guixue Wang Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsBioengineering College of Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Nano/Micro Composite Material and Device School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqing 401331China

The development of nanomedicines provides new opportunities for the treatment of atherosclerosis(AS)due to their great advantages such as the improved drug solubility,enhanced bioavailability and reduced side *** these advantages,nanomedicines are still facing some *** problems remain in the short circulation life,lack of specific targeting and poor drug release *** order to overcome the shortages of conventional nanomedicines,the combination of biomimetic strategy with smart nanoagents has been *** light with the high reactive oxygen species(ROS)level in AS microenvironment and the fact that macrophages play a critical role in the pathogenesis of AS,we fabricated ROS-responsive biomimetic nanoparticles(NPs),which camouflaged macrophage membrane(MM)on ROS-responsive NPs loaded with rapamycin(RNPs)for potential application in AS *** resulting ROSresponsive biomimetic NPs(MM/RNPs)exhibited favorable hydrodynamic size with negative surface charge,retained the functional proteins from MM,and showed ROS-responsive drug *** of the biomimetic camouflaging on surface,MM/RNPs could effectively escape from macrophages uptake and target to inflammatory endothelial ***,MM/RNPs could inhibit the proliferation of macrophages and smooth muscle cells in ***,the MM-coated NPs were found to be nontoxic in both cytotoxicity assay and in vivo toxicity ***,these results demonstrated that MM/RNPs could be a potential candidate of drug delivery system for safe and effective anti-AS applications.

关键词： biomimetic nanoparticles macrophage membrane ROS-responsive targeted delivery atherosclerosis

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The Microstructure and Interfacial Bonding of the Ultrafine-Grained Nanodiamond Reinforced 2024 Aluminum Matrix Composite

SSRN

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SSRN 2024年

作者： Xie, Kun Feng, Kai Lu, Fei Cai, Bin Zhang, Guoshang Yue, Pengfei Zhang, Guopeng Liu, Zhongxia Key Laboratory of Henan Advanced Conductor Materials Materials Institute of Henan Academy of Science Zhengzhou450046 China No. 666 Zijingshan South Road Zhengzhou450061 China Key Laboratory of Material Physics Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou450052 China State Key Laboratory of Superhard Materials School of Materials Science and Engineering Key Laboratory of Automobile Materials MOE Jilin University Changchun130012 China

On the premise of fabricating uniformly dispersed ND-reinforced 2024Al (ND/2024Al) composites, the detailed microstructure and interfacial bonding of the ultrafine-grained ND/2024Al composite were investigated with the help of SEM, TEM, and the corresponding EDS mapping. Different influence factors, such as ND's physical characteristics on physical bonding, non-metallic elements (C, O), metal solute elements (Cu, Mg), and their interaction effects on the interface of the ND/2024Al composite were carefully discussed. Meanwhile, the influence of the O element on the interface between diamond and aluminum was evaluated by the first principles calculation, which corresponded well with the experimental results. Our work would promote the development of ND-reinforced aluminum matrix composites (AMCs) and their further application. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Fe-doped and sulfur-enriched Ni3S2 nanowires with enhanced reaction kinetics for boosting water oxidation

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Green Chemical engineering 2022年第4期3卷 367-373页

作者： Liyue Zhang Qiucheng Xu Rukai Zhao Yanjie Hu Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Chemical EngineeringEast China University of Science and TechnologyShanghai200237China Section for Surface Physics and Catalysis(SurfCat) Department of PhysicsTechnical University of Denmark2800Kgs.LyngbyDenmark

Exploring cost-effective and highly-active oxygen evolution reaction(OER)electrocatalysts is a pressing task to propel water electrolysis for green hydrogen ***,we constructed a class of Fe-doped and Senriched Ni_(3)S_(2)nanowires electrocatalysts for optimizing the target intermediates adsorption to decrease the OER overpotentials at various current *** optimal Ni_(3)S_(2)-1.4%Fe electrocatalyst possesses the most active sites and exhibits an ultralow overpotential of 190 mV at 10 mA cm^(-2) with an excellent stability of>60 h,exceeding the majority of recently-reported Ni_(3)S_(2)-based *** trivalence Fe-doping not only reduces the electron density of the Ni center,but also enables the sulfur enrichment on the Ni_(3)S_(2) surface,which greatly improves the intrinsic activity and the number of target intermediates(*OOH).A novel methanol-assisted electrochemical evaluation further reveals that the Ni_(3)S_(2)-1.4%Fe electrocatalyst demonstrates a weaker binding ability to*OH with the rapid generation of*OOH species,and thus gives a lower apparent activation energy compared with the surface sulfur reduced *** work provides a new perspective for regulating the adsorption of intermediates through doping strategy.

关键词： Ni3S2 Electrocatalyst Water splitting Oxygen evolution reaction

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MaintaAvatar: A Maintainable Avatar Based on Neural Radiance Fields by Continual Learning

arXiv

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arXiv 2025年

作者： Gu, Shengbo Qiu, Yu-Kun Tang, Yu-Ming Wu, Ancong Zheng, Wei-Shi School of Computer Science and Engineering Sun Yat-sen University China Peng Cheng Laboratory Shenzhen China Key Laboratory of Machine Intelligence and Advanced Computing Ministry of Education China

The generation of a virtual digital avatar is a crucial research topic in the field of computer vision. Many existing works utilize Neural Radiance Fields (NeRF) to address this issue and have achieved impressive results. However, previous works assume the images of the training person are available and fixed while the appearances and poses of a subject could constantly change and increase in real-world scenarios. How to update the human avatar but also maintain the ability to render the old appearance of the person is a practical challenge. One trivial solution is to combine the existing virtual avatar models based on NeRF with continual learning methods. However, there are some critical issues in this approach: learning new appearances and poses can cause the model to forget past information, which in turn leads to a degradation in the rendering quality of past appearances, especially color bleeding issues, and incorrect human body poses. In this work, we propose a maintainable avatar (MaintaAvatar) based on neural radiance fields by continual learning, which resolves the issues by utilizing a Global-Local Joint Storage Module and a Pose Distillation Module. Overall, our model requires only limited data collection to quickly fine-tune the model while avoiding catastrophic forgetting, thus achieving a maintainable virtual avatar. The experimental results validate the effectiveness of our MaintaAvatar model. © 2025, CC BY.

关键词： Federated learning

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Grain selection and growth orientation of prior-β phase for Ti-6-4 during additive manufacturing:insights from a modeling perspective

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China Foundry 2021年第2期18卷 83-93页

作者： Wei-zhao Sun Fei-hu Shan Nan-fu Zong Hong-biao Dong Tao Jing Key Laboratory for Advanced Materials Processing Technology Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Science and Technology on Power Beam Processes Laboratory AVIC Beijing Aeronautical Manufacturing Technology Research InstituteBeijing 100024China School of Engineering University of LeicesterLEI 7RHUK

The microstructure of Ti-6-4 components produced by additive manufacturing suffers from the coarse and elongated prior-β grain,which leads to a decrease of the tensile behavior and the occurrence of *** understand and control the grain evolution,a multiscale simulation is applied to investigate the relationship between the grain selection,growth orientation,and the molten pool morphology with the different deposition layer numbers and processing *** accuracy of the simulation is validated by experiments in both qualitative and quantitative *** show that when the grain with unfavorable orientation loses the competitive growth with its neighbors,there will be a great chance that the blocked grain is eliminated in the following layer-and-layer deposition,which leads to the increase of the grain *** size of the molten pool increases remarkably as the layer number increases,which lays a heavy burden on the stability of the molten *** analytical relationship between the molten pool morphology and the grain growth orientation is also *** flat molten pool causes the grains with the <001> direction close to the building direction to have greater survival ***,decreasing the line power energy shows little effect on the stability of the molten pool and the grain growth orientation,especially when the deposited layer number is *** revealing mechanisms will help in understanding and further controlling the grain evolution.

关键词： additive manufacturing Ti-6-4 simulation grain selection grain growth

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Surface modification of plasma nitriding on AlxCoCrFeNi high-entropy alloys

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Journal of materials science & Technology 2020年第13期47卷 140-145页

作者： Jinxiong Hou Wenwen Song Liwei Lan Junwei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Steel Institute RWTH Aachen UniversityAachen52072Germany Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan030024China

Plasma nitriding is successfully employed in treating AlxCoCrFeNi high-entropy alloys(HEAs)with finelydivided Al content(i.e.,x values in molar ratio,x=0.1-0.8)to develop wear-resistant structural *** greatly removes the Al from the matrix that completely deplete the Ni-Al enriched phase,forming nanoscaled nitrides(AIN and CrN)precipitations near the *** promotes the hardness of present alloys with values widely ranging from 276 HV to 722 ***,the higher content the Al,the smaller thickness the nitrides layer,but the higher hardness due to the increased amount of hard nitrides phases and volume fraction of BCC ***,plasma nitriding considerably improves the wear re sistance of AlxCoCrFeNi HEAs by 4-18 times.

关键词： Plasma nitriding High-entropy alloy Microstructure Hardness Wear and tribology

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Study on the Characteristics and Mechanism of Discharge Degradation Products of Epoxy Resin Matrix in Composite Insulators Under Humid Air Environment 19th

Study on the Characteristics and Mechanism of Discharge Degr...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Zhiyu, Wan Dandan, Zhang Chao, Gao Ming, Lu Hui, Li Zhenbiao, Li Kexin, Shi School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Ministry of Education Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China Henan Jiuyu EPRI Electric Power Technology Co. Ltd. Zhengzhou450052 China

ISBN: (纸本)9789819613823

The degradation of the epoxy resin matrix in the core rods of composite insulators is the primary factor leading to decay-like deterioration and fracture accidents. Partial discharge in a humid environment is a critical trigger for this phenomenon. As an organic polymer, epoxy resin is prone to degradation under discharge, producing complex degradation products that can have secondary effects on surrounding materials, further accelerating the decay-like deterioration process. To optimize the formulation and manufacturing process of composite insulator materials and mitigate or even prevent decay-like fractures, it is crucial to study the discharge degradation products and mechanisms of the epoxy resin matrix. In this study, discharge experiments were conducted on anhydride-cured bisphenol A epoxy resin used in composite insulators within a closed humid environment. Changes in chemical functional groups of solid samples before and after discharge were analyzed from the high-frequency region to the fingerprint region. The main components and relative yields of liquid and gaseous discharge products were detected, and the primary reaction mechanisms during the discharge degradation process were thoroughly investigated. Results indicate that partial discharge in humid air induces instantaneous temperature rise and radical action, leading to epoxy resin degradation, generating alcohols and hydroxyl groups, which may increase the material’s hydration capacity and surface conductivity, thereby reducing electric field uniformity. Gaseous products such as methane, acetone, ethylene, and ethyl acetate produced by discharge pyrolysis may exacerbate stress at the core rod and sheath interface, increasing the risk of interfacial damage. Liquid products like nitric acid, carboxylic acids, and acetone may accelerate glass fiber fracture and sheath swelling. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Partial discharges

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Interfacial Structure, Mechanical Properties, and Corrosion Resistance of Cr/Tisin Nano-Multilayer Coating by Fcva Technique

SSRN

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SSRN 2024年

作者： Yang, Jiao Zhao, Nie Tang, Yibo Cao, Hongshuai Qi, Fugang Ouyang, Xiaoping Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and Engineering Xiangtan University Xiangtan411105 China Laboratory of Beam Technology and Energy Materials Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai Zhuhai519087 China

TiSiN coating suffers from limited toughness strain and high residual stress, leading to poor adhesion to the substrate and easy peeling failure in practical applications. The construction of metal/ceramic nano-multilayer coatings has been considered an effective solution to address the challenges faced by single hard TiSiN coatings. In this research, Cr/TiSiN nano-multilayer coatings were deposited using the FCVA technique, and the microstructure, mechanical properties, corrosion resistance and corrosion mechanism of the coating were studied. Cr/TiSiN nano-multilayer coating presented columnar crystal structure and coherent interface, forming a nanocomposite interface, which resulted in a significant superhard effect and enhanced the hardness of the nano-multilayer coatings. The addition of soft metal Cr layer improved the adhesion between TiSiN coating and substrate and the fracture toughness of TiSiN coating. Furthermore, the corrosion resistance of Cr/TiSiN nano-multilayer coatings was substantially improved, and the corrosion current density (Icorr) reached 1.299×10-9 A/cm2. This was attributed to the good surface quality and the nanocomposite structure that effectively prevent the deeper penetration of corrosive media. Therefore, Cr/TiSiN nano-multilayer coatings exhibited excellent corrosion resistance in harsh corrosive environments. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance

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