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SSRN 2024年

作者： Fan, Yuanyuan Liang, Deshan Yang, Huayu Liang, Chen Dong, Shouzhe Gao, Rongzhen Liang, Minchuan Yang, Jia Wang, Yue Ai, Hui Ma, Ji Ma, Jing Zhang, Jinxing Chen, Long-Qing Wang, Jing Nan, Ce-Wen Huang, Houbing Advanced Research Institute of Multidisciplinary Science School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Analysis & Testing Center Beijing Institute of Technology Beijing100081 China School of Material Science and Engineering Kunming University of Science and Technology Yunnan Kunming650093 China Department of Physics Key Laboratory of Multi-scale Spin Physics Ministry of Education Beijing Normal University Beijing100875 China Department of Materials Science and Engineering Pennsylvania State University University ParkPA16802 United States

Curvature conservation is a common feature for the physical properties with topological constraints, from the macroscopic cosmic string loops to the microscopic quantized vortex rings in superfluid. Interestingly, ferroelectric domain-wall curvature is important to determine its conduction, which is the key parameter for designing domain-wall nanoelectronic devices. Here, we demonstrate the curvature conservation of the charged domain walls confined in ferroelectric topological structures with specific domain symmetry by combining piezoelectric force microscopy, conducting atomic force microscopy and phase-field simulations. Significantly, the intrinsic conductivity of the charged domain walls, exhibits an inverse functional relationship with the local domain-wall curvature in the ferroelectric BiFeO3 nano-islands, which can also be precisely and continuously modulated by applying an electric field. This work provides us with an insightful understanding of the conduction mechanism of charged domain walls confined in ferroelectric topological structures with high degree of spatial symmetry, which paves the way for the application of charged domain walls as flexible conducting channels with continuously changing resistance states to be used for ferroelectric domain-wall memristors. © 2024, The Authors. All rights reserved.

关键词： Domain walls

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Tungsten Disulfide Coupling with Halogen Free Electrolyte for Magnesium Battery Applications

SSRN

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SSRN 2023年

作者： Alahmadi, M. El-Dek, Engy Moselhy, Mostafa A. AbdelMonem, M. Neair, Shereen H. Refai, H.S. El-Desoky, Mohamed M. Yang, Xiao-Yu Sheha, Eslam Chemistry Department College of Science Taibah University P.O. Box 344 Madinah Saudi Arabia Chemistry Department Faculty of Science Benha University Benha13518 Egypt Physics Department Faculty of Science Benha University Benha13518 Egypt Reactor Physics Department Nuclear Research Center Egyptian Atomic Energy Authority Cairo13759 Egypt Physics Department Faculty of Science Suez University Suez43518 Egypt State Key Laboratory of Advanced Technology for Materials Synthesis and Processing State Key Laboratory of Silicate Materials for Architectures Shenzhen Research Institute School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Magnesium batteries are promising post-lithium storms for their low cost and high energy density. Engineering novel cathodic materials compensates the charge imbalance due to the introduction of the bivalent magnesium cation in the framework of the cathode is one of the key solutions for realizing practical Mg battery. Herein, crystal engineering of WS2 using Al doping strategy are conducted to regulate magnesium storage and electrochemical reaction kinetics of WS2 cathodes. tungsten disulfide (WS2) and Al-doped WS2 (WS2@Alx, x=0, 2 and 4 wt.%) are prepared by a one-step hydrothermal technique and used as a cathode material for magnesium batteries. We explore the Mg2+ insertion/extraction process on the WS2@Alx in the presence of halogen free electrolyte (HFE) based on 0.69 M Mg(NO3)2·6H2O dissolved in acetonitrile (ACN):tetra ethylene glycol dimethyl ether (G4) (∼2: 1). The Mg/WS2 full battery containing Al delivered high initial discharge capacity compared with the Al free cell. The introduction of anode/electrolyte polymer interface inhibits the passivation of Mg anode, via insulation between the liquid electrolyte and Mg anode. This study provides an effective method to design a practical Mg cathode and a new understanding of crystal engineering of WS2 by Al doping which may help in constructing high performance cathode for Mg batteries applications. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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Domain Features-Informed Two-Step Machine Learning: Accelerate the Searching for Superlubric Heterostructures

SSRN

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SSRN 2024年

作者： Chen, Lu Zhang, Hanyue Li, Ruoyu Mei, Hui Shi, Junqin Liu, Zhe Zhou, Feng Liu, Weimin Fan, Xiaoli State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials School of Material Science and Engineering Northwestern Polytechnic University Shaanxi Xi'An710072 China Queen Mary University of London Engineering School Northwestern Polytechnical University Shaanxi Xi’an710072 China Science and Technology Thermostructural Composite Materials Laboratory School of Materials Science and Engineering Northwestern Polytechnical University Shaanxi Xi’an710072 China School of Materials Science & Engineering Northwestern Polytechnical University Shaanxi Xi’an710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China

Van der Waals (vdW) heterostructure composed of transitional metal dichalcogenides (TMDs) monolayers has great potential for achieving structural superlubricity. Nevertheless, searching for the heterostructures holding superlubric interface consisting of TMDs monolayers is challenging owing to the abundance and variety of constituent elements. Here, the domain features informed two-step machine learning (ML) approach is employed to conduct this challenge but imperative task. Specifically, ML models are trained and adopted to predict the complicated domain features from basic structural features for a large number of heterostructures in the search space. Then, Bayesian optimization is employed to search for the superlubric interface. Particularly, the ML models are well chained via iteratively rechaining based on small amount of high-accuracy calculations. This novel approach largely saves the computational time, and ensures the accuracy. Importantly, MoS2/WS2, MoS2/VS2, and NiS2/NbSSe heterostructures have been screened out and identified as possessing structural superlubricity. The superlubricity of MoS2/WS2 and MoS2/VS2 heterostructures are confirmed via both the first-principles calculations and molecular dynamic (MD) simulations. The measured friction coefficients at the interface of MoS2/VS2 in the friction testing are smaller by 12% ~ 36% under normal load of 1 ~ 5 N compared to MoS2/MoSe2, whose superlubricity was already proven previously. These results verify the reliability and validity of our two-step ML approach on searching for superlubric heterostructure within significantly reduced time. Not only that, this two-step ML approach suggests an effective way of searching for novel and advanced materials. © 2024, The Authors. All rights reserved.

关键词： Friction

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Adherence and interaction of cationic quantum dots on bacterial surfaces

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Journal of colloid and interface science 2015年 450卷 388-395页

作者： Cheng Yang Hao Xie Qi-Chang Li En-Jie Sun Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Electronic address: h.xie@***. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles Namur B-5000 Belgium. Electronic address: bao-lian.su@fundp.ac.be.

Understanding molecular mechanisms of interactions between nanoparticles and bacteria is important and essential to develop nanotechnology for medical and environmental applications. Quantum dots (QDs) are specific nanoparticles with unique optical properties and high photochemical stability. In the present study, direct interactions were observed between cationic QDs and bacteria. Distinct fluorescence quenching patterns were developed when cationic QDs interacted with Gram negative and Gram positive bacteria. The aggregation of QDs on bacterial surface as well as fluorescence quenching depends upon the chemical composition and structure of the bacterial cell envelopes. The presence of lipopolysaccharide is unique to Gram-negative bacterial surface and provides negatively charge areas for absorbing cationic QDs. The effects of lipopolysaccharide were proved on fluorescence quenching of cationic QDs. In contrast to Gram-negative bacteria, the presence of teichoic acids is unique to Gram-positive bacterial cell wall and provides negatively charged sites for cationic QDs along the chain of teichoic-acid molecules, which may protect QDs from aggregation and fluorescence quenching. This study may not only provide insight into behaviors of QDs on bacterial cell surfaces but also open a new avenue for designing and applying QDs as biosensors in microbiology, medicine, and environmental science.

关键词： Bacterial cell wall Bacterial surface Cell membrane Fluorescence quenching Gram-negative bacteria Gram-positive bacteria Lipopolysaccharides (LPS) Nanoparticles Quantum dots (QDs) Teichoic-acids

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Observation of the out-of-plane polarized spin current from CVD grown WTe2

arXiv

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arXiv 2021年

作者： Shi, Shuyuan Li, Jie Hsu, Chuang-Han Lee, Kyusup Wang, Yi Yang, Li Wang, Junyong Wang, Qisheng Wu, Hao Zhang, Wenfeng Eda, Goki Liang, Gengchiau Chang, Haixin Yang, Hyunsoo Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Quantum-Nano Matter and Device Lab State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Institute of Physics Academia Sinica Taipei11529 Taiwan Key Laboratory of Materials Modification by Laser Ion and Electron Beams Ministry of Education Dalian University of Technology Dalian116024 China Centre for Advanced 2D Materials National University of Singapore 6 Science Drive 2 117546 Singapore Department of Physics National University of Singapore 117542 Singapore

Weyl semimetal Td-phase WTe2 possesses the spin-resolved band structure with strong spin-orbit coupling, holding promises as a useful spin source material. The noncentrosymmetric crystalline structure of Td-WTe2 endows the generation of the out-of-plane polarized spin, which is of great interest in magnetic memory applications. Previously, WTe2 was explored in spin devices based on mechanically exfoliated single crystal flakes with a size of micrometers. For practical spintronics applications, it is highly desirable to implement wafer-scale thin films. In this work, we utilize centimeter-scale chemical vapor deposition (CVD)-grown Td-WTe2 thin films and study the spin current generation by the spin torque ferromagnetic resonance technique. We find the in-plane and out-of-plane spin conductivities of 7.36 × 103 (ħ/2e) (Ωm)–1 and 1.76 × 103 (ħ/2e) (Ωm)–1, respectively, in CVD-growth 5 nm-WTe2. We further demonstrate the current induced magnetization switching in WTe2/NiFe at room temperature in the domain wall motion regime, which may invigorate potential spintronic device innovations based on Weyl semimetals. Copyright © 2021, The Authors. All rights reserved.

关键词： Thin films

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Alloying effect enhanced bimetallic Ni-Fe/TiO 2 catalysts for selective hydrogenation of 1,3-butadiene in the presence of an excess of propylene

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Molecular Catalysis 2023年 550卷

作者： Wei-Hao Wang Bo Jiang Zhao Wang Ya Chen Yao Li Ting-Ting Luo Feng Cheng Bao-Lian Su The State Key Laboratory of Advanced Technology for Material Synthesis and processing Wuhan University of Technology Wuhan 430070 China Center for Materials Research and Analysis Wuhan University of Technology Wuhan 430070 China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 Rue de Bruxelles B-5000 Namur Belgium

Nickel is a promising Pd alternative candidate for selective alkynes/alkadienes hydrogenation owing to its high catalytic activity and cheap price, however, with fatal restrictions of low alkenes selectivity and inferior stability caused by its strong olefin adsorption and the cleavage of carbon-carbon bond. Herein, controlled amounts of iron were introduced into nickel as catalytic assistant by deposition-precipitation with urea on TiO 2 support. Using 1,3-butadiene in an excess of propylene to simulate the industrial process, the additional Fe shows a significant enhancement to the catalytic performance of Ni, i.e., Ni-Fe/TiO 2 with Ni/Fe atomic ratio 1:0.33 shows >94% of 1,3-butadiene conversion and >95% of alkenes selectivity after above 200 h of time on stream, superior to that of commercial Pd/Al 2 O 3 catalyst. Further in-situ analysis reveals that the alloying effect from the formation of Ni-rich Ni-Fe intermetallic compound (e.g., Ni 3 Fe alloy) enlarges the distance between two Ni active sites and enriches the electronic density of Ni sites, resulting in a weak adsorption of butenes products for offering such excellent catalytic performance. To the best of our knowledge, this is the first in-depth exploration on supported Ni-Fe bimetallic catalyst for selective hydrogenation of light alkynes/alkadienes. It shows a high potential for replacing the commercial Pd-based catalysts.

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Thermoelectric materials: Multi‐Scale Microstructural Thermoelectric materials: Transport Behavior, Non‐Equilibrium Preparation, and Applications (Adv. Mater. 20/2017)

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advanced materials 2017年第20期29卷

作者： Xianli Su Ping Wei Han Li Wei Liu Yonggao Yan Peng Li Chuqi Su Changjun Xie Wenyu Zhao Pengcheng Zhai Qingjie Zhang Xinfeng Tang Ctirad Uher State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China Department of Physics University of Michigan Ann Arbor MI 48109 USA

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Highly efficient synthesis of ordered nitrogen-doped mesoporous carbons with tunable properties and its application in high performance supercapacitors

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Journal of Power Sources 2016年 321卷 143-154页

作者： Dan Liu Chao Zeng Deyu Qu Haolin Tang Yu Li Bao-Lian Su Deyang Qu Department of Chemistry School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 People’s Republic of China Laboratory of Inorganic Materials Chemistry University of Namur 61 Rue de Bruxelles B-5000 Namur Belgium Clare Hall University of Cambridge Herschel Road Cambridge CB3 9AL United Kingdom Department of Mechanical Engineering College of Engineering and Applied Science University of Wisconsin Milwaukee 3200 N. Cramer Street Milwaukee WI 53211 USA

Nitrogen-doped ordered mesoporous carbons (OMCs) have been synthesized via aqueous cooperative assembly route in the presence of basic amino acids as either polymerization catalysts or nitrogen dopants. This method allows the large-scale production of nitrogen-doped OMCs with tunable composition, structure and morphology while maintaining highly ordered mesostructures. For instances, the nitrogen content can be varied from ∼1 wt% to ∼6.3 wt% and the mesophase can be either 3-D body-centered cubic or 2-D hexagonal. The specific surface area for typical OMCs is around 600 m 2 g −1 , and further KOH activation can significantly enhance the surface area to 1866 m 2 g −1 without destroying the ordered mesostructures. Benefiting from hierarchically ordered porous structure, nitrogen-doping effect and large-scale production availability, the synthesized OMCs show a great potential towards supercapacitor application. When measured in a symmetrical two-electrode configuration with an areal mass loading of ∼3 mg cm −2 , the activated OMC exhibits high capacitance (186 F g −1 at 0.25 A g −1 ) and good rate capability (75% capacity retention at 20 A g −1 ) in ionic liquid electrolyte. Even as the mass loading is up to ∼12 mg cm −2 , the OMC electrode still yields a specific capacitance of 126 F g −1 at 20 A g −1 .

关键词： N-doped carbon Mesoporous Supercapacitor Tunable properties

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Controlled Drug Release: Magnesium Particles Coated with Mesoporous Nanoshells as Sustainable Therapeutic-Hydrogen Suppliers to Scavenge Continuously Generated Hydroxyl Radicals in Long Term (Part. Part. Syst. Charact. 2/2019)

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Particle & Particle Systems Characterization 2019年第2期36卷

作者： Lei Kong Chuanrui Chen Fangzhi Mou Yizheng Feng Ming You Yixia Yin Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China

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Cover Feature: Free-Standing Pearl-Chains-like MoO2Hierarchical Nanowires with Enhanced Pseudocapacitive Energy Storage (Batteries & Supercaps 9/2022)

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Batteries & Supercaps 2022年第9期5卷

作者： Changwei Shi Shihao Feng Xinyuan Li Jianyong Zhang Prof. Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan 528200 P. R. China

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