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Low-temperature sintered(Na_(1/2)Bi_(1/2))TiO_(3)-based incipient piezoceramics for co-fired multilayer actuator application

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Journal of Materiomics 2019年第3期5卷 480-488页

作者： Pengyuan Fan Yangyang Zhang Shan-Tao Zhang Bing Xie Yiwei Zhu Mohsin Ali Marwat Weigang Ma Kai Liu Liang Shu Haibo Zhang School of Materials Science andEngineering State Key Laboratory of Material ProcessingDie&Mould TechnologyHuazhong University of Science and TechnologyWuhan430074China Information Engineering Institute Huanghe Science and Technology CollegeZhengzhou450000China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied ScienceCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Research Centre for Functional Ceramics Ministry of EducationHuazhong University of Science and TechnologyWuhan430074China

Low-temperature sintered(Na_(1/2)Bi_(1/2))_(0.935)Ba_(0.065)Ti_(0.975)(Fe_(1/2)Nb_(1/2))_(0.025)O_(3)(NBT-BT-0.025FN)lead-free incipient piezoceramics were investigated using high-purity Li_(2)CO_(3) as sintering *** the ≤0.5 wt%Li_(2)CO_(3) addition,the introduced Li^(+) cations precede to enter the A-sites of the perovskite lattice to compensate for the A-site *** the addition exceeds 0.5 wt%,the excess Lit cations will occupy B-sites and give rise to the generation of oxygen vacancies,which accelerate the mass transport and thus lower the sintering temperature effectively from 1100℃ down to 925℃.It was also found that a small amount of Lit addition has little effect on the phase structure and electromechanical properties of the system,but overweight seriously disturbs these characteristics because of the large lattice *** sintered NBT-BT-0.025FN incipient piezoceramics with 1.25 wt%Li_(2)CO_(3) addition at 925℃ provides a large strain of 0.33% and a corresponding large signal piezoelectric coefficient d_(33)^(*) of 550 pm/V at 60 kV/cm,indicating this system is a very promising candidate for lead-free co-fired multilayer actuator application.

关键词： Lead-free piezoceramics (Na_(1/2)Bi_(1/2))TiO_(3) Low-temperature sintering Electric-field-induced strain

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A structure-supporting,self-healing,and high permeating hydrogel bioink for establishment of diverse homogeneous tissue-like constructs

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Bioactive materials 2021年第10期6卷 3580-3595页

作者： Hongqing Chen Fei Fei Xinda Li Zhenguo Nie Dezhi Zhou Libiao Liu Jing Zhang Haitao Zhang Zhou Fei Tao Xu Department of Neurosurgery Xijing HospitalFourth Military Medical UniversityXi’an710032People’s Republic of China Department of Neurosurgery Central Theater General HospitalWuhan430010People’s Republic of China Department of Ophthalmology Xijing HospitalFourth Military Medical UniversityXi’an710032People’s Republic of China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Department of Mechanical EngineeringTsinghua UniversityBeijing100084People’s Republic of China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationDepartment of Mechanical EngineeringTsinghua UniversityBeijing100084People’s Republic of China Department of Neurosurgery Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu610072China Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital Chengdu610072China Department of Orthopedics Fourth Medical Center of PLA General Hospital100048BeijingPeople’s Republic of China East China Institute of Digital Medical Engineering Shangrao334000People’s Republic of China Department of Precision Medicine and Healthcare Tsinghua-Berkeley Shenzhen InstituteShenzhen518055People’s Republic of China

The ready-to-use,structure-supporting hydrogel bioink can shorten the time for ink preparation,ensure cell dispersion,and maintain the preset shape/microstructure without additional assistance during ***,ink with high permeability might facilitate uniform cell growth in biological constructs,which is beneficial to homogeneous tissue ***,current bioinks are hard to meet these requirements simultaneously in a simple ***,based on the fast dynamic crosslinking of aldehyde hyaluronic acid(AHA)/N-carboxymethyl chitosan(CMC)and the slow stable crosslinking of gelatin(GEL)/4-arm poly(ethylene glycol)succinimidyl glutarate(PEG-SG),we present a time-sharing structure-supporting(TSHSP)hydrogel bioink with high permeability,containing 1%AHA,0.75%CMC,1%GEL and 0.5%*** TSHSP hydrogel can facilitate printing with proper viscoelastic property and self-healing *** crosslinking with 4%PEG-SG for only 3 min,the integrity of the cell-laden construct can last for 21 days due to the stable internal and external GEL/PEG-SG networks,and cells manifested long-term viability and spreading ***-like,muscle-like,and cartilage-like in vitro constructs exhibited homogeneous cell growth and remarkable biological *** work provides not only a convenient and practical bioink for tissue engineering,targeted cell therapy,but also a new direction for hydrogel bioink development.

关键词： Time-sharing structure-supporting High permeability Bioink Homogeneous cell growth Tissue-like constructs

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Two-Dimensional Metal-Organic Frameworks Towards Spintronics

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Angewandte Chemie 2023年第41期135卷

作者： Dr. Xiaoli Yan Xi Su Prof. Jian Chen Dr. Chao Jin Prof. Long Chen State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 China Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology Department of Applied Physics School of Sciences Tianjin University Tianjin 300350 China

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Effects of annealing and cold roll-bonded interface on the microstructure and mechanical properties of the embedded aluminum-steel composite sheet

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Science Bulletin 2018年第21期63卷 1448-1456页

作者： Chunyang Wang Xinhua Liu Yanbin Jiang Jianxin Xie Xiaojun Zhang Dejing Zhou Key Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China AECC Beijing Institute of Aeronautical Materials Beijing 100095China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Jiangsu Key Laboratory for Clad Materials YinBang Clad Material Company LimitedWuxi 214145China

Embedded aluminum-steel composite sheets used in heat exchanger were produced by cold roll bonding(CRB). The influences of annealing temperature and annealing time on the microstructure and the bonding strength of the composite sheet were investigated. The recrystallization of the steel layer began at 525℃ and finished at 600℃. With the increase of the annealing temperature, the peel strength of the composite sheet whose original steel sheet surface was treated by scratch brush initially increased and then decreased, which was resulted from the competition of the mechanical locking and metallurgical bonding. After annealing, the cracks which formed between the broken work-hardened steel surface layer and its matrix during cold roll bonding remained. The composite sheet produced by CRB with the steel surface treatment of flap disc had less interfacial defects, higher bonding quality, higher diffusion rate of Al and Fe atoms at the interface and larger metallurgical bonding extent than the composite sheet produced by CRB with the steel surface treatment of scratch brush under the same conditions of annealing,which was helpful to shorten annealing time, reduce energy consumption and improve production efficiency.

关键词： Aluminum-steel composite sheets Annealing Mechanical properties

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Frontispiece: Anion Modulation of Pt-Group Metals and Electrocatalysis Applications

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Chemistry – A European Journal 2021年第48期27卷

作者： Ding Chen Jiawei Zhu Dr. Zonghua Pu Prof. Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Foshan Xianhu Laboratory of Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan 528200 P. R. China

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In-Situ Constructing C3n5 Nanosheets/Bi2wo6 Nanodots S-Scheme Heterojunction with Enhanced Structural Defects for Efficiently Photocatalytic Removal of Tetracycline and Cr(Vi)

SSRN

引用

SSRN 2022年

作者： Li, Shijie Cai, Mingjie Wang, Chunchun Liu, Yanping Zhang, Junlei Wang, Zhaohui Chen, Xiaobo Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province National Engineering Research Center for Marine Aquaculture College of Marine Science and Technology Zhejiang Ocean University Zhejiang Province Zhoushan316022 China Institute of Innovation & Application Zhejiang Ocean University Zhejiang Province Zhoushan316022 China State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi’an710072 China Shanghai Key Laboratory of Urbanization and Ecological Restoration School of Ecological and Environmental Sciences East China Normal University Shanghai200241 China Shanghai200062 China Department of Chemistry University of Missouri Kansas CityMO64110 United States

Building step-scheme (S-scheme) heterojunctions is newly emerging to be an efficient means to get excellent photocatalysts for water pollution control. Herein, a 2D/0D S-scheme heterojunction of C 3 N 5 /Bi 2 WO 6 is synthesized by in-situ growing 0D Bi 2 WO 6 nanodots on 2D C 3 N 5 nanosheets. Photocatalytically removing tetracycline (TC) and Cr(VI) from water is employed to evaluate the activity of C 3 N 5 /Bi 2 WO 6 under visible light compared to C 3 N 5 , Bi 2 WO 6 , and their mechanical mixture. Obviously, Bi 2 WO 6 /C 3 N 5 is much more active in visible-light-driven TC and Cr(VI), meaning that a strong interaction between C 3 N 5 nanosheets and Bi 2 WO 6 nanodots is formed by in-situ growth. Such an interaction can be illustrated as the S-scheme transfer behavior of photogenerated electrons and holes which boosts interfacial charge separation, retains the optimum redox ability of photo-induced charge carriers and fosters the generation of more active species. Moreover, C 3 N 5 /Bi 2 WO 6 shows more structural defects than single C 3 N 5 and single Bi 2 WO 6 , which may endow C 3 N 5 /Bi 2 WO 6 with a better ability in the activation and photo-oxidation of TC as well as the activation and photo-reduction of Cr(VI). In a nutshell, this work gives a deeply understanding on the photocatalytic mechanism based on C 3 N 5 /Bi 2 WO 6 as well as presents a newfangled thought for developing highly efficient S-scheme heterojunction photocatalysts for water decontamination. © 2022, The Authors. All rights reserved.

关键词： Heterojunctions

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Application of Co 3 O 4 -based materials in electrocatalytic hydrogen evolution reaction: A review

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International Journal of Hydrogen Energy 2020年第41期45卷 21205-21220页

作者： Junqing Ma Huijie Wei Yong Liu Xinyuan Ren Yixuan Li Fei Wang Xinyue Han Enmin Xu Xiaoyu Cao Guangxin Wang Fengzhang Ren Shizhong Wei National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471023 PR China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal new Materials and Advanced Processing Technology Henan Key Laboratory of Non-Ferrous Materials Science & Processing Technology Henan University of Science and Technology Luoyang 471023 PR China School of Art & Design Henan University of Science and Technology Luoyang 471023 PR China Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou City School of Chemistry and Chemical Engineering Henan University of Technology Zhengzhou 450001 PR China

Environmental pollution and energy shortage make the development of clean energy more and more urgent. As a kind of clean renewable energy, hydrogen have attracted great attentions in recent years. Recently, Co 3 O 4 -based materials have emerged as promising candidates for electrocatalytic hydrogen evolution reaction (HER), due to their attractive electrocatalytic activity, low cost as well as the electrochemical durability, which make it attract widely attentions. In this review, we summarize the application of Co 3 O 4 -based materials in electrocatalytic HER, including pure Co 3 O 4 , the doped Co 3 O 4 and the Co 3 O 4 -based composite materials. Furthermore, the strategies to enhance their electrocatalytic performance are summarized and discussed, such as morphological engineering, doping, as well as compositing with other materials. Finally, the limitation and challenges of Co 3 O 4 -based materials for HER, as well as their prospects for future research, are proposed. We believe that this review will be helpful for scientists to seek promising HER electrocatalytic materials.

关键词： Co 3 O 4 Nanostructured Doping Composites Electrocatalysts Hydrogen evolution reaction

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M−N3Configuration on Boron Nitride Boosts Singlet Oxygen Generation via Peroxymonosulfate Activation for Selective Oxidation

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Angewandte Chemie 2024年第26期136卷

作者： Dr. Jianzheng Zhen Dr. Jiahao Sun Dr. Xiangwei Xu Dr. Zenglong Wu Dr. Wenkai Song Dr. Yunzhan Ying Dr. Shikun Liang Dr. Lingshan Miao Dr. Jiazhen Cao Prof. Dr. Weiyang Lv Prof. Dr. Changsheng Song Prof. Dr. Yuyuan Yao Prof. Dr. Mingyang Xing National Engineering Lab of Textile Fiber Materials & Processing Technology (Zhejiang) Zhejiang Sci-Tech University Hangzhou 310018 China Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 China Zhejiang Provincial Innovation Center of Advanced Textile Technology Shaoxing 312000 China Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou 310018 China

Singlet oxygen ( 1 O 2 ) is an essential reactive species responsible for selective oxidation of organic matter, especially in Fenton-like processes. However, due to the great limitations in synthesizing catalysts with well-defined active sites, the controllable production and practical application of 1 O 2 remain challenging. Herein, guided by theoretical simulations, a series of boron nitride-based single-atom catalysts (BvBN/M, M=Co, Fe, Cu, Ni and Mn) were synthesized to regulate 1 O 2 generation by activating peroxymonosulfate (PMS). All the fabricated BvBN/M catalysts with explicit M−N 3 sites promoted the self-decomposition of the two PMS molecules to generate 1 O 2 with high selectivity, where BvBN/Co possessed moderate adsorption energy and d -band center exhibited superior catalytic activity. As an outcome, the BvBN/Co-PMS system coupled with membrane filtration technology could continuously transform aromatic alcohols to aldehydes with nearly 100 % selectivity and conversion rate under mild conditions, suggesting the potential of this novel catalytic system for green organic synthesis.

关键词： single-atom catalysts boron nitride singlet oxygen Fenton-like reaction selective oxidation

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Influence of Alloying Elements Sn and Ti on the Microstructure and Mechanical Properties of Gray Cast Iron

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Procedia Manufacturing 2019年 37卷 353-359页

作者： Abdul Razaq Yajun Yin Jianxin Zhou Xu Shen Xiaoyuan Ji Ismat Ullah State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430047 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 PR China

The investigations are finalized after reviewing and observing the influence of mechanical properties of the gray cast iron via adding pearlite promoting alloying elements such as Tin (Sn), Titanium (Ti). The results indicated, the microstructure, Brinell hardness and Ultimate tensile strength of the gray cast iron were significantly changed. Graphite and matrix evolution was emphasized by scanning electron microscopy. It was observed, the Sn in experimental range reduces graphite size, whereas, the pearlite quantity increased about 95% with the increasing of Sn and Ti. The prepared samples showed A, B, D, E and F type-microstructures. Adding significant concentration of Sn (0.492 wt%) and Ti (0.591 wt%) stimulate the Ultimate tensile strength and impact toughness, showing the highest values of 314 MPa and 234, respectively. Yield strength was plunged with the addition of Sn and Ti content because of the presence of more pearlite. Samples containing excessive Sn and Ti experience sharp deterioration in mechanical properties due to brittle cementite.

关键词： Alloying Elements Sn Ti Gray cast iron Microstructure Mechanical properties

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InSe Schottky diodes based on van der Waals contacts

arXiv

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arXiv 2020年

作者： Zhao, Qinghua Jie, Wanqi Wang, Tao Castellanos-Gomez, Andres Frisenda, Riccardo State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi’an710072 China Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Xi’an710072 China MadridE-28049 Spain

Two-dimensional semiconductors are excellent candidates for next-generation electronics and optoelectronics thanks to their electrical properties and strong light-matter interaction. To fabricate devices with optimal electrical properties, it is crucial to have both high-quality semiconducting crystals and ideal contacts at metal-semiconductor interfaces. Thanks to the mechanical exfoliation of van der Waals crystals, atomically-thin high-quality single-crystals can easily be obtained in a laboratory. However, conventional metal deposition techniques can introduce chemical disorder and metal-induced mid-gap states that induce Fermi level pinning and can degrade the metal-semiconductor interfaces, resulting in poorly performing devices. In this article, we explore the electrical contact characteristics of Au-InSe and graphite-InSe van der Waals contacts, obtained by stacking mechanically exfoliated InSe flakes onto pre-patterned Au or graphite electrodes without the need of lithography or metal deposition. The high quality of the metal-semiconductor interfaces obtained by van der Waals contact allows to fabricate high-quality Schottky diodes based on the Au-InSe Schottky barrier. Our experimental observation indicates that the contact barrier at the graphite-InSe interface is negligible due to the similar electron affinity of InSe and graphite, while the Au-InSe interfaces are dominated by a large Schottky barrier. Copyright © 2020, The Authors. All rights reserved.

关键词： Selenium compounds

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