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arXiv 2021年

作者： Dung, Dinh Ngoc Phan, Anh D. Nguyen, Toan T. Lam, Vu D. Faculty of Materials Science and Engineering Phenikaa University Yen Nghia Ha Dong Ha Noi12116 Viet Nam Phenikaa Institute for Advanced Study Phenikaa University Yen Nghia Ha Dong Ha Noi12116 Viet Nam Key Laboratory for Multiscale Simulation of Complex Systems Faculty of Physics VNU University of Science Vietnam National University – Hanoi 334 Nguyen Trai Street Thanh Xuan District Hanoi10000 Viet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Viet Nam

We propose a theoretical model to elucidate intermolecular electrostatic interactions between a virus and a substrate. Our model treats the virus as a homogeneous particle having surface charge and the polymer fiber of the respirator as a charged plane. Electric potentials surrounding the virus and fiber are influenced by the surface charge distribution of the virus. We use Poisson-Boltzmann equations to calculate electric potentials. Then, Derjaguin’s approximation and a linear superposition of the potential function are extended to determine the electrostatic force. In this work, we apply this model for coronavirus or SARS-CoV-2 case and numerical results quantitatively agree with prior simulation. We find that the influence of fiber’s potential on the surface charge of the virus is important and is considered in interaction calculations to obtain better accuracy. The electrostatic interaction significantly decays with increasing separation distance, and this curve becomes steeper when adding more salt. Although the interaction force increases with heating, one can observe the repulsive-attractive transition when the environment is acidic. Copyright © 2021, The Authors. All rights reserved.

关键词： Boltzmann equation

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Porous SiC/melamine-derived carbon foam frameworks with excellent electromagnetic wave absorbing capacity

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Journal of advanced Ceramics 2019年第4期8卷 479-488页

作者： Xinli YE Zhaofeng CHEN Sufen AI Bin HOU Junxiong ZHANG Xiaohui LIANG Qianbo ZHOU Hezhou LIU Sheng CUI International Laboratory for Insulation and Energy Efficiency Materials College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 211106China Suzhou Superlong Aviation Heat Resistance Material Technology Co. Ltd.Suzhou 215400China Beijing Spacecrafts China Academy of Space TechnologyBeijing 100080China Department of Reactor Engineering China Institute of Atomic EnergyBeijing 102413China The State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing Tech UniversityNanjing 211800China

Porous three-dimensional Si C/melamine-derived carbon foam(3 D-Si C/MDCF)composite with an original open pore structure was fabricated by the heat treatment of the commercial melamine foam(MF),carbonization of the stable MF,and chemical vapor deposition of the ultra-thin Si C *** electron microscopy(SEM)and X-ray diffraction(XRD)were employed to detect the microstructure and morphology of the as-prepared *** results indicated that the 3 D-Si C/MDCF composites with the coating structure were prepared *** obtained minimum reflection loss was–29.50 d B when the frequency and absorption thickness were 11.36 GHz and 1.75 mm,***,a novel strategy was put forward to state that the best microwave absorption property with a thin thickness of 1.65 mm was gained,where the minimum reflection loss was–24.51 d B and the frequency bandwidth was 3.08 *** excellent electromagnetic wave absorption ability resulted from the specific cladding structure,which could change the raw dielectric property to acquire excellent impedance *** present work had a certain extend reference meaning for the potential applications of the lightweight wave absorption materials with target functionalities.

关键词： three-dimensional SiC/melamine-derived carbon foam(3D-SiC/MDCF) chemical vapor deposition coating structure electromagnetic wave absorption characteristic minimum reflection loss

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Gas Pool Coupled Activating TIG Welding Method with Coupling Arc Electrode

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Chinese Journal of Mechanical Engineering 2018年第6期31卷 169-176页

作者： Yong Huang Rui-Lin Liu Yan-Zhao Hao State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China Department of Aviation Manufacture Engineering Chengdu Aeronautic Polytechnic Chengdu 610100 China Technology Center Great Wall Motor Company Limited Baoding 071000 China

Gas pool coupled activating TIG(GPCA?TIG) welding put forward in?house can dramatically enhance weld penetration of TIG welding through introducing active element oxygen to reverse the Marangoni convection flow in the molten pool. In order to further improve the welding productivity, the normal solid tungsten electrode is replaced by a kind of coupling arc electrode. The changes of arc pressure distribution along anode surface and the weld appearance were evaluated. On this basis, the dependences of weld shape characterized with weld depth, width and undercut on the main welding parameters were discussed. The results indicate, the substitution of coupling arc electrode can lead to an obvious decrease of arc pressure. Compared to hollow tungsten electrode and twin tungsten electrodes, the coupling arc electrode is much easier to manufacture and has more compacter structure. Combined with the symmetric distribution of arc pressure in di erent directions, this electrode has extensive adaptability. In the GPCA?TIG welding with coupling arc electrode, both the substitution of coupling arc electrode and the introduction of outer active gas oxygen can reduce the possibilities of producing humping bead and undercut. Their joint action makes this welding method have the capability of realizing high travel speed and deep penetration welding.

关键词： GPCA?TIG welding Coupling arc electrode Oxygen Arc pressure Weld shape Welding parameter

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Bonding performance and mechanism of a heat-resistant composite precursor adhesive (Rt-1000^◦ c) for tc4 titanium alloy

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Journal of Micromechanics and Molecular Physics 2020年第4期5卷

作者： Wang, Mingchao Bu, Fanxing Zhou, Cunjun Zhou, Qingjun Wei, Tong Liu, Jiachen Zhai, Wenzheng College of Science Civil Aviation University of China Tianjin 300300 China College of Aeronautical Engineering Civil Aviation University of China Tianjin 300300 China School of Materials and Engineering Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 China

To facilitate the repairing and connecting processes for the non-main bearing TC4 alloy, a high-temperature (up to 1000◦ C) resistant adhesive that is converted to the composite of intermetallics and ceramics is prepa... 详细信息

To facilitate the repairing and connecting processes for the non-main bearing TC4 alloy, a high-temperature (up to 1000^◦ C) resistant adhesive that is converted to the composite of intermetallics and ceramics is prepared. The composition evolution of the adhesive, the structure changes in the bonding layer, the reaction process at interfaces and the fracture mode of joints are comprehensively studied to explore its bonding mechanism. The results show that chemical bonding mechanism based on the formation of Ti₅ Si₃ plays a critical role at 600^◦ C, and acts as the crucial one at elevated temperatures. As the reaction interlayer (2–5 µm) is far thinner than the entire bonding layer (60–70 µm), mechanical properties of the adhesive dominate the bonding performance, which is tied up with the composition and structure evolution. The differ of coefficient of thermal expansion (CTE) between the adhesive and the substrate remains lower than 3 × 10⁻⁶ K⁻¹ in range of 500–1000^◦ C. Specifically, the formation of composites from intermetallics and ceramics improves the mechanical properties and heat-resistant of the adhesive. The bonding strength reaches ∼40 MPa after pre-treatment at 1000^◦ C without pressure, and remains over 30 MPa within the normal operating temperature range of 500–700^◦ C. © World Scientific Publishing Company.

关键词： Bonding mechanism Composition evolution Heat-resistant adhesive High-temperature bonding performance Interfacial reaction Thermal cycles

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Corrigendum to “A general approach to simulate the atom distribution, lattice distortion, and mechanical properties of multi-principal element alloys based on site preference: Using FCC_CoNiV and CoCrNi to demonstrate and compare” [J. Alloy. Compd. 935(1) (2023) 168016]

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Journal of Alloys and Compounds 2023年 955卷

作者： Rong Chen Tianliang Xie Bo Wu Liangji Weng Hamid Ali Shuwen Yang Yan Zhao Panhong Zhao Chubo Zhang Renhui Cao Jiansen Wen Qipeng Yao Qi Cai Haifeng Zhang Baisheng Sa Cuilian Wen Maohua Lin Xu Sun Hang Su Yu Liu Chunxu Wang Multiscale Computational Materials Facility Key Laboratory of Eco-Materials Advanced Technology College of Materials Science and Engineering Fuzhou University Fuzhou 350100 China Materials Design and Manufacture Simulation Facility School of Advance Manufacturing Fuzhou University Jinjiang 362200 China Central Iron & Steel Research Institute Group Beijing 100081 China Department of Ocean and Mechanical Engineering Florida Atlantic University Boca Raton 33431 USA

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Interactions between water vapor and atmospheric aerosols have key roles in air quality and climate change

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National Science Review 2018年第4期5卷 452-454页

作者： Zhijun Wu Jie Chen Yu Wang Yishu Zhu Yuechen Liu Bai Yao Yuanhang Zhang Min Hu State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking University Centre for Atmospheric Sciences School of Earth and Environmental Sciences University of Manchester Beijing Innovation Center for Engineering Sciences and Advanced Technology Peking University

INTRODUCTION Atmospheric aerosols,which are ubiquitous in the planetary boundary layer,have received much attention due to their effects on visibility,climate and human ***,a semi-volatile species,is ubiquitous in the atmosphere as *** interaction between water vapor and aerosols plays a key role in determining the aerosol properties in the atmosphere and therefore has great effects on both air quality(Fig.1a and b)and climate

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High and Low Temperature Resistance of Phenyl silicone rubber

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IOP Conference Series: Materials Science and Engineering 2021年第1期1048卷

作者： Yanhua Huang Qiuhong Mu Zhengtao Su Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Materials and Application Research for vibration and Noise Reduction Beijing 100095 China Qilu University of Technology (Shandong Academy of Sciences) Advanced Materials Institute Jinan 250014 China Shandong Provincial Key Laboratory for Special Silicone-Containing Materials Jinan 250014 China

Methyl Phenyl and diphenyl silicone rubbers were synthesized from octamethyl cyclotetrasiloxane (D4), methylphenyl cyclosiloxane, octaphenyl cyclotetrasiloxane, etc. Compared with the commercial methylvinyl silicone rubber, the high and low temperature resistances of methyl vinyl silicone rubber were studied in this paper. The results showed that the introduction of phenyl groups can improve the thermal properties of silicone rubber, and the thermal stability of diphenyl silicone rubber is better than that of methyl phenyl silicone rubber. But there is little difference of mechanical properties in high temperature environment for three silicone rubber. DMTA analysis showed that there were still a small amount of crystals in diphenyl silicone rubber, while methylphenyl silicone rubber was amorphous rubber. The mechanical properties at low temperature indicated that the tensile strength of diphenyl silicone rubber was 4.1Mpa higher than that of methylphenyl silicone rubber at -70 °C due to the existence of low-temperature crystallization.

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Combination of ozonation and electrolysis process to enhance elimination of thirty structurally diverse pharmaceuticals in aqueous solution

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Journal of hazardous materials 2019年 368卷 281-291页

作者： Xiang Li Yujue Wang Bin Wang Jun Huang Shubo Deng Gang Yu Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China School of Environment State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Key Laboratory for Emerging Organic Contaminants Control Tsinghua University Beijing 100084 China. School of Environment State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Key Laboratory for Emerging Organic Contaminants Control Tsinghua University Beijing 100084 China. School of Environment State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Key Laboratory for Emerging Organic Contaminants Control Tsinghua University Beijing 100084 China. Electronic address: yg-den@***.

The increasing amounts of pharmaceuticals in aqueous environment are found to be structurally diverse. O has been demonstrated as a high effective agent in removing pharmaceuticals, however, O is a very selective oxidant which is ineffective for some ozone refractory structures. Recently, a novel electrochemistry-based oxidation process (E-peroxone) has been developed by a simple combination of electrolysis and conventional ozonation process, which can produce a large amount of aqueous OH in situ. E-peroxone process can enhance the performance of conventional ozonation process. The purpose of this study was to investigate the elimination performance of thirty pharmaceuticals with various chemical structures including macrolide, quinolone, sulfonamides, tetracycline, carboxylic group, Naphthalene, Nitrogen-containing group, CC double bond in electrolysis, ozonation and E-peroxone process. Parent pharmaceuticals and TOC elimination were compared. By comparing different chemical groups, the synergy effect of pharmaceuticals with carboxylic and amide groups were significant, with average degradation level 98.7 ± 2.8% within 15 min. Degradation levels of some groups were quite efficient during both ozonation and E-peroxone process, such as macrolide, quinolone, sulfonamides and tetracycline. E-peroxone process improved the TOC and acute toxicity elimination efficiency of mixed pharmaceutical solutions significantly. Major operation parameters and cross correlation analysis were also evaluated.

关键词： Chemical structure Degradation Ozonation Pharmaceuticals Synergy

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Large-area printing of ferroelectric surface and super-domains for efficient solar water splitting

arXiv

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arXiv 2020年

作者： Tian, Yu Wei, Yaqing Pei, Minghui Cao, Rongrong Gu, Zhenao Wang, Jing Liu, Kunhui Shang, Dashan Niu, Jiebin An, Xiaoqiang Long, Run Zhang, Jinxing Department of Physics Beijing Normal University Beijing100875 China School of Basic Medical Science Air Force Medical University Shaanxi Xi’an710032 China College of Chemistry Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education Beijing Normal University Beijing100875 China Key Laboratory of Microelectronics Devices and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing100081 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Surface electronic structures of the photoelectrodes determine the activity and efficiency of the photoelectrochemical water splitting, but the controls of their surface structures and interfacial chemical reactions remain challenging. Here, we use ferroelectric BiFeO3 as a model system to demonstrate an efficient and controllable water splitting reaction by large-area constructing the hydroxyls-bonded surface. The up-shift of band edge positions at this surface enables and enhances the interfacial holes and electrons transfer through the hydroxyl-active-sites, leading to simultaneously enhanced oxygen and hydrogen evolutions. Furthermore, printing of ferroelectric super-domains with microscale checkboard up/down electric fields separates the distribution of reduction/oxidation catalytic sites, enhancing the charge separation and giving rise to an order of magnitude increase of the photocurrent. This large-area printable ferroelectric surface and super-domains offer an alternative platform for controllable and high-efficient photocatalysis. Copyright © 2020, The Authors. All rights reserved.

关键词： Ferroelectricity

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Recent progress in friction stir welding tools used for steels

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Journal of Iron and Steel Research International 2018年第5期25卷 477-486页

作者： Lei Cui Chao Zhang Yong-chang Liu Xiu-guo Liu Dong-po Wang Hui-jun Li Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and Engineering Tianjin University Tianjin 300354 China State Key Lab of Hydraulic Engineering Simulation andSafety School of Materials Science and Engineering TianjinUniversity Tianjin 300354 China Faculty of Engineering and Information Sciences Universityof Wollongong Wollongong 2522 NSW Australia

Friction stir welding （FSW） technology is being increasingly attractive in welding steels on account of the high-quality weld formation and excellent weld properties. The feasibility of FSW of steels has been convinced for nearly 20 years. However, the application progress for FSW of steels is slower than that of aluminum alloys owing to the high cost and poor usability of tools. The FSW tools are called as the heart of FSW process which is critical for welding quality control and the weld microstructure and properties. The recent progresses in research and development of FSW tools for welding steels have been reviewed. Material selections, geometry parameters, wear behavior and use life of the tools are summarized from the available literatures.

关键词： Friction stir welding Steel FSW process Tool material Tool design Tool wear behavior

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