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Magnetic field induced Weyl state in the van der Waals–type antiferromagnet GdTe3

Physical Review B 2023年第20期108卷 205132-205132页

作者： Y. M. Wan E.-J. Cheng H.-Y. Ma X. F. Yang X. F. Hou X. J. Chen X. Zhang C. Y. Xi Z. C. Zhong J. P. Liu Y. F. Guo S. Y. Li State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai 200433 China Leibniz Institute for Solid State and Materials Research (IFW-Dresden) Dresden 01069 Germany Max Planck Institute for Chemical Physics of Solids Dresden 01187 Germany School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 201210 China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China

GdTe3, a van der Waals–type antiferromagnetic (AFM) metal with high mobility, is gaining a lot of attention for its potential use in high-speed spintronic devices as well as for fundamental physics research. Due to the magnetocrystalline anisotropy of GdTe3, exotic effects are envisaged, when the magnetic configurations interact with an external magnetic field. In this work, a magnetic-field-induced Weyl state in GdTe3 is revealed. In the AFM state, GdTe3 is topologically trivial. However, when an external magnetic field exceeding ∼20 T aligns all spins, band splitting occurs, and then a topological transition is induced, i.e., from a trivial metallic state to a topological Weyl metallic state. In addition, a topological change of Fermi surfaces, i.e., a field-induced Lifshitz transition, is uncovered, which may also be rooted in band splitting. Moreover, high-pressure electrical transport measurements reveal a peculiar superconducting transition with a nearly invariant superconducting transition temperature (Tc∼4.2 K) spanning a wide range of pressure up to 48 GPa. These findings imply that GdTe3 provides a unique platform for investigating not only the interactions of charge-density-wave fluctuations and superconductivity but also the interplay between magnetism and topology.

关键词： Antiferromagnets Superconductors Topological materials

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Construction of High-Contrast Hydrophobic-Hydrophilic Microfluidic Channels with Controlled Wettability on Pvdf Filter Paper surface Using Maskless Microplasma Scanning

SSRN

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SSRN 2022年

作者： Wang, Tao Wang, Jiahao Lv, Li Wang, Shengquan Wang, Xin Yang, Weizhi Li, Meng Shi, Liping Anhui Province Key Laboratory of Special Heavy Load Robot Anhui University of Technology Ma'anshan243032 China School of Mechanical Engineering Anhui University of Technology Ma'anshan243032 China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education Anhui University of Technology Ma'anshan243032 China Anhui Province Engineering Laboratory of Intelligent Demolition Equipment Ma'anshan243032 China

Paper-based microfluidic analytical devices (μPADs) have attracted increasing interest due to their unique advantages. Localized hydrophilization on superhydrophobic paper surfaces to form the microfluidic channels and their wettability control are the key issues in μPADs preparation. This paper introduces a novel method to construct high-contrast hydrophobic-hydrophilic microfluidic channels on the surface of the Poly(vinylidene fluoride) (PVDF) filter paper by maskless microplasma writing. The hydrophilic performances and surface morphology of the channels were characterized by water contact angle (WCA) and scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to analyze their chemical compositions. The results showed that paper surface changed from hydrophobic to hydrophilic and its wettability can be controlled through plasma parameters adjustment. PVDF layer was gradually removed to expose root-like fibers, and the fluorine-containing groups on paper surface of the microchannels decreased with increasing microplasma treatment time, while the hydrophilic groups (e.g. –C=O) appeared and increased with longer treatment time. Finally, the mechanism of the microfluidic channels construction by microplasma was also discussed, and microfluidic channel with the pattern "H" were demonstrated and successfully constructed. This work shows great potential for simple, fast, environmental friendly and low-cost construction of μPADs. © 2022, The Authors. All rights reserved.

关键词： Wetting

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Annual research review of perovskite solar cells in 2023

材料展望（英文）

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材料展望（英文） 2024年第2期3卷 161-213页

作者： Qisen Zhou Xiaoxuan Liu Zonghao Liu Yanqing Zhu Jianfeng Lu Ziming Chen Canjie Li Jing Wang Qifan Xue Feifei He Jia Liang Hongyu Li Shenghao Wang Qidong Tai Yiqiang Zhang Jiehua Liu Chuantian Zuo Liming Ding Zhenghong Xiong Renhao Zheng Huimin Zhang Pengjun Zhao Xi Jin Pengfei Wu Fei Zhang Yan Jiang Huanping Zhou Jinsong Hu Yang Wang Yanlin Song Yaohua Mai Baomin Xu Shengzhong Liu Liyuan Han Wei Chen Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyLuoyu Road 1037Wuhan 430074People's Republic of China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyLuoyu Road 1037Wuhan 430074People's Republic of China Optics Valley Laboratory Hubei 430074People's Republic of China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070People's Republic of China State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640People's Republic of China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006People's Republic of China Department of Materials Science State Key Laboratory of Photovoltaic Science and TechnologyFudan University220 Handan RoadShanghai 200433People's Republic of China Materials Genome Institute Shanghai UniversityShangda Rd.99Shanghai 200444People's Republic of China The Institute of Technological Sciences Wuhan UniversityWuhan 430072People's Republic of China College of Chemistry Zhengzhou UniversityZhengzhou 450001People's Republic of China Future Energy Laboratory School of Materials Science and EngineeringHefei University of TechnologyHefei 230009People's Republic of China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People's Republic of China School of Chemical Engineering Center for Antibonding Regulated CrystalsSungkyunkwan UniversitySuwon 16419Republic of Korea State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions Xinjiang Key Laboratory of Electronic Information Materials and Devices Xinjiang Technical Institute of Physics & ChemistryCAS40-1 South Beijing RoadUrumqi 830011People's Republic of China S

Perovskite(PVK)solar cells(PSCs)have garnered considerable research interest owing to their cost-effectiveness and high efficiency.A systematic annual review of the research on PSCs is essential for gaining a comprehensive understanding of the current research ***,systematic analysis of the research papers on PSCs reporting key findings in 2023 was *** on the results,the papers were categorized into six classifications,including regular n-i-p PSCs,inverted p-i-n PSCs,PVK-based tandem solar cells,PVK solar modules,device stability,and lead toxicity and green ***,a detailed overview and summary of the annual research advancements within each classification were ***,this review serves as a valuable resource for guiding future research endeavors in the field of PSCs.

关键词： perovskite solar cells annual review systematic review

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Machine learning aided parameter analysis in Perovskite X-ray Detector

arXiv

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arXiv 2024年

作者： Zhang, Bobo Huang, Endai Du, Xinyi Ma, Xiaokang Zhang, Lu You, Jiaxue Jen, Alex K.Y. Liu, Shengzhong Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China Research Institute of Medical and Biological Engineering Ningbo University Zhejiang315211 China Department of Computer Science and Engineering The Chinese University of Hong Kong 999077 Hong Kong Department of Chemical and Biomolecular Engineering National University of Singapore Singapore Singapore National University of Singapore Singapore Singapore State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Xi’an710072 China Department of Materials Science and Engineering Hong Kong Institute for Clean Energy City University of Hong Kong 999077 Hong Kong Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian116023 China University of the Chinese Academy of Sciences Beijing100039 China

Many factors in perovskite X-ray detectors, such as crystal lattice and carrier dynamics, determine the final device performance (e.g., sensitivity and detection limit). However, the relationship between these factors remains unknown due to the complexity of the material. In this study, we employ machine learning to reveal the relationship between 15 intrinsic properties of halide perovskite materials and their device performance. We construct a database of X-ray detectors for the training of machine learning. The results show that the band gap is mainly influenced by the atomic number of the B-site metal, and the lattice length parameter b has the greatest impact on the carrier mobility-lifetime product (μτ). An X-ray detector (m-F-PEA)2PbI4 were generated in the experiment and it further verified the accuracy of our ML models. We suggest further study on random forest regression for X-ray detector applications. © 2024, CC BY.

关键词： Machine learning

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Numerical Simulation and Machine Learning Prediction of the Direct Chill Casting Process of Large-Scale Aluminum Ingots

SSRN

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SSRN 2023年

作者： Guo, Guan-Hua Yao, Ting Liu, Wen-Sheng Tang, Sai Xiao, Dai-Hong Huang, Lan-Ping Wu, Lei Feng, Zhao-Hui Gao, Xiao-Bing National Key Laboratory of Science and Technology on High-strength Structural Materials Central South University Changsha410083 China Shaanxi Nonferrous Yulin New Material Group Co Ltd Yulin719099 China Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications Beijing Institute of Aeronautical Materials Beijing100095 China

The large-scale ingot of the 7xxx-series aluminum alloys fabricated by the direct chill (DC) casting is often suffered from foundry defects such as cracks and cold shut due to the formidable challenges in precise controlling of casting parameters. In this work, by using the integrated computational method combing numerical simulations with machine learning, we investigated systematically the evolution of multi-physical fields and grain structures during the solidification processes. The numerical simulation results quantified the influences of key casting parameters including pouring temperature, casting speed, primary cooling intensity, and secondary cooling water flow rate on the shape of mushy zone, heat transport, residual stress and grain structure of DC casting billets. Then, based on the data of numerical simulations, we established a novel model for the relationship between casting parameters and solidification characteristics through machine learning. By comparing with experimental measurements, the model showed reasonable accuracy in predicting the sump profile, microstructure evolution and solidification kinetics under the complicated influences of casting parameters. The integrated computational method and predicting model could be used to efficiently and accurately determine the DC casting parameters to decrease the casting defects. © 2023, The Authors. All rights reserved.

关键词： Optimization

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Highly efficient oxygen evolution and stable water splitting by coupling NiFe LDH with metal phosphides

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Science China Materials 2021年第7期64卷 1662-1670页

作者： Chengye Song Yi Liu Yuchao Wang Shuaihao Tang Wenkui Li Qian Li Jian Zeng Lei Chen Hongcheng Peng Yongpeng Lei State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China School of Materials and Mechanical Engineering Jiangxi Key Laboratory of Surface EngineeringJiangxi Science and Technology Normal UniversityNanchang 330013China Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Material Science and Engineering Central South University of Forestry and TechnologyChangsha 410004China Energy Materials Computing Center Jiangxi University of Science and TechnologyNanchang 330013China State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003China

It is a great challenge to develop highly active oxygen evolution reaction(OER)electrocatalysts with superior *** this study,a NiFe layered double hydroxidedecorated phosphide(NiFe LDH@CoP/NiP_(3))was constructed to display satisfactory OER activity and good stability for water splitting in alkaline *** an overpotential of 300 mV,NiFe LDH@CoP/NiP_(3) achieved a current density of 82 mA cm^(-2) for the OER,which was 9.1 and 2.3 times that of CoP/NiP_(3) and NiFe LDH,***,the reconstruction behavior,during which oxyhydroxides formed,was studied by a combination of X-ray photoelectron spectroscopy,Raman spectroscopy,and scanning electron microscopy.A synergistic effect between NiFe LDH and CoP/NiP_(3) was also observed for the hydrogen evolution ***,when NiFe LDH@CoP/NiP_(3) acted as both the cathode and anode for overall water splitting,a high current density of 100 mA cm^(-2) was maintained for more than 275 *** addition,under Xe light irradiation,a solar-to-hydrogen efficiency of 9.89% was achieved for solar-driven water *** work presents the coupling of different active compositions,and can provide a reference for designing bifunctional electrocatalysts.

关键词： bifunctional electrocatalysis oxygen evolution reaction phosphides layered double hydroxides water splitting

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A New SINS/USBL Integration Navigation with the Unknown Position of the Transponder

A New SINS/USBL Integration Navigation with the Unknown Posi...

引用

International Conference on Robotics and Automation engineering (ICRAE)

作者： Maodong Xia Tao Zhang Liang Zhang Bo Yang School of Instrument Science & Engineering Southeast University Nanjing China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education Southeast University Nanjing China Interdisciplinary Division of Aeronautical and Aviation Engineering Hong Kong Polytechnic University Hong Kong China

Autonomous underwater vehicles (AUV) are viewed as the carrier for marine resource exploitation and utilization, which need accurate navigation information. The main navigation mode of AUV is based on the strap-down inertial system (SINS), assisted by the ultra-short baseline system (USBL). Traditional SINS/USBL integration navigations are under the assumption that the precise position of the transponder is obtained in advance by the long baseline system (LBL), which increases the complexity of system operations. Therefore, a new integration navigation with the unknown position of the transponder is proposed. State vectors are augmented, which additionally contain the position errors of the transponder. Modified state and measurement equations are established, respectively. The optimal position errors of AUV and the transponder are got simultaneously by the Kalman filter. The mathematical simulation is performed to show the superiority of the proposed algorithm.

关键词： Autonomous underwater vehicles Automation Navigation Systems operation Filtering algorithms Mathematical models Calibration

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The Natural and Long-Term Preservable Anticoagualnt Property of Si-O & Tio2 Bilayer Films

SSRN

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SSRN 2023年

作者： Liao, Yuzhen Chen, Xiao He, Zikun Li, Linhua Liu, Xiaoqi Qu, Chao Sun, Hong Zhao, Ansha Yang, Ping Huang, Nan Chen, Jiang The department of Ophthalmology Sichuan Provincial People's Hospital University of Electronic Science and Technology of China Chengdu China Institute of Biomaterials and Surface Engineering Key Laboratory for Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University Chengdu610031 China Sichuan Provincial Key Laboratory for Human Disease Gene Study The Department of Medical Genetics The Institute of Laboratory Medicine Sichuan Academy of Medical Sciences Sichuan Provincial People's Hospital University of Electronic Science and Technology Chengdu China

Titanium dioxide (TiO2) film has been extensively studied as a blood-contacting material. However, the inherent positive charge and the low -OH group on the surface lead to its insufficient anticoagulant properties. Besides, due to the high adsorption rate of carbon-containing adsorbates, the anticoagulant property of TiO2 films is rapidly lost during storage. It is challenging to improve the natural anticoagulant property of TiO2 films and to prolong their storage time. Here, Si-O & TiO2 bilayer films were constructed using unbalanced magnetron sputtering by covering the TiO2 surface with a Si-O film height of about 40 nm. This bilayer film showed long-term hydrophilicity, negative charging, low carbon-containing adsorbates adhesion, and high –OH group content. The XPS etching results showed that the Si-O-Ti bond formed at the interface of Si-O and TiO2, leading to the above unique properties, which further induced excellent natural anticoagulant properties of the bilayer film. After 15 weeks of storage, the platelet surface coverage on the Si-O & TiO2 film was less than 30% of that on the TiO2 film. This Si-O & TiO2 bilayer film showed satisfactory long-term anticoagulant properties and therefore is expected to be an alternative to TiO2 film for blood-contacting devices. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Thermo-Mechanical Fatigue Crack Growth in a Nickel-Based Powder Metallurgy Superalloy

SSRN

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SSRN 2024年

作者： Zhang, Lu Wang, Yuzhuo Yu, Zhiwei Jiang, Rong Baxevanakis, Konstantinos Roy, Anish Zhao, Liguo Tian, Gaofeng Song, Yingdong College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough University Epinal Way LoughboroughLE11 3TU United Kingdom Science and Technology on Advanced High Temperature Structural Materials Laboratory AEEC Beijing Institute of Aeronautical Materials Beijing100095 China State Key Laboratory of Mechanics and Control Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China

Fatigue crack growth is studied in a nickel-based powder metallurgy (PM) superalloy (FGH4099) subjected to in-phase (IP) and out-of-phase (OP) thermo-mechanical fatigue (TMF), as well as isothermal fatigue (IF) at peak temperature. The crack growth rate and path are evaluated for both coarse grain (CG) and fine grain (FG) FGH4099, especially the effects of phase angle and polycrystalline microstructure. The results show that the TMF crack propagation is mainly transgranular in OP condition;while in IP condition, fatigue crack propagates intergranularly at low ∆K and transforms to transgranular after passing the transition region. The crack propagation resistance for FG microstructure is lower than that for CG microstructure at elevated temperature, as a result of secondary cracks and grain boundary weakening effect. Crystallographic slip controls the crack propagation process, while the twin boundaries (TB) and special grain boundaries also exert a significant influence on crack deflection. The formation of secondary cracks is closely related to local misorientation and crystallographic deformation during TMF crack propagation. The crack deflection in a single grain reveals a competition mechanism between crystallographic slip and grain boundary effect, which explains the lower crack growth rate for OP when compared to IP or IF. © 2024, The Authors. All rights reserved.

关键词： Fatigue crack propagation

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Machine learning-assisted characterization of oil micro-displacement hydrodynamics by bionanofluid-flooding in microchannel sand-packed porous media towards enhanced oil recovery

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Chinese Journal of Chemical engineering 2025年

作者： Zhihong Chen Jiawei Wu Wei Zhang Wenjing Zhang Xiaoling Lou Junxian Yun State Key Laboratory of Green Chemistry Synthesis and Conversion Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 China State Key Laboratory of Advanced Separation Membrane Materials Zhejiang Key Laboratory of Surface and Interface Science and Engineering for Catalysts College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 China

The displacement of residual crude oil and enhanced oil recovery from reservoirs of mature oil fields are challenging worldwide and have received intensive attentions in oil and gas industry. In this work, a novel method for enhanced oil recovery by displacement of oil with bionanofluids was proposed. Micro-displacement hydrodynamics of crude oil in microchannel sand-packed porous media by the bionanofluid were investigated by high-speed imaging. The machine learning models with the extreme gradient boosting (XGBoost) algorithm was developed for the prediction of residual oil saturation during the micro-displacement processes. The residual oil droplets within the porous media after the waterflooding were effectively removed through bionanofluid-flooding, resulting in additional enhanced oil recovery of 39.0%, which is double the recovery achieved by waterflooding at the same displacement velocity. By wavelet-transform image enhancement and the XGBoost algorithm in the machine learning, the residual oil saturations along the porous media were predicted accurately with the mean squared errors of 0.0045 and 0.0030 in the waterflooding and the bionanofluid-flooding, respectively. The results indicated that the machine learning is effective in characterizing the displacement behaviors and the bionanofluid-flooding could be an interesting approach, and thus has potential applications in enhanced oil recovery of waterflooding reservoirs.

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