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arXiv 2019年

作者： Wang, Y.J. Tang, Y.L. Zhu, Y.L. Feng, Y.P. Ma, X.L. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Wenhua Road 72 Shenyang110016 China University of Chinese Academy of Sciences Yuquan Road 19 Beijing100049 China State Key Lab of Advanced Processing and Recycling on Non-ferrous Metals Lanzhou University of Technology Langongping Road 287 Lanzhou730050 China

Domain walls (DWs) are ubiquitous in ferroelectric materials. Ferroelastic DWs refer to those who separate two domains with unparalleled polarizations (or two different ferroelastic variants). These ultrathin interfaces could be designed as minimized electronic devices1 since they possess fascinating functionalities, such as conductivity2, abnormal photovoltaic effect3, and so on. They are responsible to the enhancement of dielectric and piezoelectric properties of ferroelectric materials4,5. It is long believed that the structures of ferroelastic DWs can be simply explained from the perspective of mechanical and electric compatibilities in the framework of the Landau-Ginzburg-Devonshire (LGD) theory. Here we show that the converse flexoelectricity must be taken into account for fully describing the nature of ferroelastic DWs. The converse flexoelectricity is a stress or a strain induced by polarization gradients6, which is complementary to the relatively well-known direct flexoelectricity (the polarization induced by strain gradients)7. In our work, an unexpected asymmetric structure is identified, which is beyond the prediction of the conventional LGD theory. By incorporating the converse flexoelectricity into the LGD theory and using it to analyze high-resolution images acquired by the aberration-corrected transmission electron microscope (TEM), we demonstrate that it is the converse flexoelectricity that result in the asymmetric structure. Moreover, the flexoelectric coefficient is derived bquantifying the converse flexoelectricity around the DWs. This quantification is deterministic in both the magnitude and sign of flexoelectric coefficients, by the mutual verification of atomic mapping and first-principles calculations. Our results suggest that the converse flexoelectricity cannot be neglected for understanding the ferroelastic DWs and other boundaries in ferroelectric materials. Copyright © 2019, The Authors. All rights reserved.

关键词： Ferroelectric materials

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Binary Cations Minimize Energy Loss in the Wide Bandgap Perovskite Towards Efficient All-Perovskite Tandem Solar Cells

SSRN

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SSRN 2023年

作者： Zhang, Kaicheng Liu, Chao Peng, Zijian Li, Chaohui Li, Canru Cerrillo, José Garcia Englhard, Jonas Li, Ning Zhang, Jiyun Tian, Jingjing Du, Tian Sathasivam, Sanjayan Macdonald, Thomas J. These, Albert Le Corre, Vincent M. Forberich, Karen Meng, Wei Osvet, Andres Lüer, Larry Bachmann, Julien Tong, Jinhui Brabec, Christoph J. Department of Materials Science and Engineering Friedrich-Alexander-Universität Erlangen-Nürnberg Martensstrasse 7 Erlangen91058 Germany Immerwahrstrasse 2 Erlangen91058 Germany Chemistry of Thin Film Materials Department of Chemistry and Pharmacy Friedrich-Alexander-Universität Erlangen-Nürnberg IZNF Cauerstrasse 3 Erlangen91058 Germany State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou510640 China Materials Chemistry Centre Department of Chemistry University College London 20 Gordon Street LondonWC1H 0AJ United Kingdom School of Engineering and Materials Science Queen Mary University of London LondonE1 4NS United Kingdom State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Perovskite-based tandem solar cells, known for their exceptional performance and cost-effective fabrication, are at the forefront of photovoltaic technologies. This study addresses key challenges in enhancing the efficiency and stability of these tandem devices, focusing on the front wide-bandgap perovskite sub-cell. The surface treatment of a 1.80 eV perovskite with binary cations, specifically guanidinium bromide and 4-fluorophenylammonium iodide, proves instrumental in reducing defect densities and mitigating interfacial energy barriers. This treatment significantly suppresses non-radiative recombination and transport losses, resulting in a remarkable open circuit voltage and fill factor (VOC × FF) product of 1.061 V and a notable power conversion efficiency (PCE) of 19.0%. Reproducibility is underscored by consistent results across different laboratories. Furthermore, integration with a tin-based narrow-bandgap perovskite yields an all-perovskite tandem device boasting a cutting-edge PCE of 27.2%. This comprehensive exploration of spacer cations’ pivotal role in perovskite surface treatment advances the technology for commercialization. © 2023, The Authors. All rights reserved.

关键词： Perovskite

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Analysis and calculation of crack propagation in boiler drum

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/...

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2006年第2期30卷 235-238页

作者： Zhao, Zaili Xiao, Jinsheng Jiang, Ailin Yao, Bin Yin, Qizhi School of Energy and Power Engineering WUT Wuhan 430063 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT Wuhan 430070 China Automobile Engineering School WUT Wuhan 430070 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China

When boiler runs under certain pressure and temperature, the disfigurement and crack will propagate, resulting in failure of the boiler drum. According to the Assess criterion of Pressure Container's Disfigurement, the maximal stress value in the dangerous area for 125MW boiler drum and its change within certain time frame under different working conditions are found out by means of finite element method. The allowable length of crack is calculated with COD mode and the yearly crack-propagating value is predicted and analyzed.

关键词： Boiler COD code Crack Drum Life

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In situ synthesis of oriented Zn-Mn-Co-telluride on precursor free CuO: An experimental and theoretical study of hybrid electrode paradigm for advanced supercapacitors

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Nano materials Science 2024年

作者： Ahmad, Muhammad Nawaz, Tehseen Hussain, Iftikhar Chen, Xi Khan, Shahid Ali Eddahani, Yassine Abraham, B. Moses Ali, Shafqat Wang, Ci Zhang, Kaili Department of Mechanical Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States Department of Chemistry The University of Hong Kong Hong Kong Department of Chemical Engineering Indian Institute of Technology Kanpur Kanpur208016 India State Key Laboratory of New Textile Materials and Advanced Processing Technologies National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430200 China Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin150001 China

The evolution of energy storage technology has seen remarkable progress, with a shift from pure metals to sophisticated, tailor-made active materials. The synthesis of nanostructures with exceptional properties is crucial in the advancement of electrode materials. In this regard, our study highlights the fabrication of a novel, oriented heterostructure comprised of Zn-Mn-Co-telluride grown on a pre-oxidized copper mesh using a hydrothermal method followed by a solvothermal process. This innovative approach leads to the formation of the Zn-Mn-Co-telluride@CuO@Cu heterostructure, which demonstrates the unique oriented morphology. It outperforms both Zn-Mn-Co-telluride@Cu and CuO@Cu by exhibiting lower electrical resistivity, increased redox activity, higher specific capacity, and improved ion diffusion characteristics. The conductivity enhancements of the heterostructure are corroborated by density functional theory (DFT) calculations. When utilized in a hybrid supercapacitor (HSC) alongside activated carbon (AC) electrodes, the Zn-Mn-Co-telluride@CuO@Cu heterostructure-based HSC achieves an energy density of 75.7 Wh kg−1. Such findings underscore the potential of these novel electrode materials to significantly impact the design of next-generation supercapacitor devices. © 2024 Chongqing University

关键词： Electrodes

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Analysis and calculation of 125 MW boiler drum transient stress

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第9期28卷 115-117页

作者： Zhao, Zai-Li Xiao, Jin-Sheng Zhang, Xiao-Jun Yao, Bin Yin, Qi-Zhi School of Energy and Power Engineering Wuhan University of Technology Wuhan 430063 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Automobile Engineering Wuhan University of Technology Wuhan 430070 China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China

Based on the boundary conditions of the running parameters and test data of 125 MW boiler drum, the transient thermal stress, mechanical stress and whole stresses of the boiler drum under four different working conditions were computed by finite element methods under 3-dimension model. The relationship among the three kinds of stresses was discussed as well as the spot of maximum stress and its varying tendency with the time was obtained.

关键词： Boiler Drum Finite element Transient stress

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Switchable Wettability: Chirality‐Triggered Wettability Switching on a Smart Polymer Surface (Adv. Mater. 14/2011)

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advanced materials 2011年第14期23卷

作者： Guangyan Qing Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Physics Institute Muenster University 48149 Muenster Germany

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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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Interfacial design for detection of a few molecules

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Chemical Society reviews 2023年第2期52卷 779-794页

作者： Ying Dong Jing Li Christoph Janiak Xiao-Yu Yang Department of Forensic Medicine Tongji Medical College Huazhong University of Science and Technology 13 Hangkong Road Wuhan 430030 China. Shenzhen Huazhong University of Science and Technology Research Institute 9 Yuexing Third Road Nanshan District Shenzhen 518000 China. Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical Engineering Wuhan University of Science and Technology 947 Peace Avenue Wuhan 430081 China. jli82@***. Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf 40204 Düsseldorf Germany. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China. xyyang@***. School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA. xyyang@seas.harvard.edu.

Major advances in molecular detection are being driven by goals associated with the development of methods that are amenable to miniaturization and automation, and that have high sensitivity and low interference. The new detection methods are confronted by many interfacial issues, which when properly addressed can lead to improved performance. One interfacial property, special wettability, can facilitate precise delivery and local enrichment of molecules to sensing elements. This review summarizes applications of unique features of special wettability in molecular detection including (1) chemical and electrochemical reactions in anchored microdroplets on superwetting surfaces, (2) enrichment of analytes and active materials at low contact areas between droplets and superwetting surfaces, (3) complete opposite affinities of superwetting surfaces toward nonpolar/polar solutes and oil/water phases, and (4) directional droplet transportation on asymmetric superwetting surfaces. The challenges and opportunities that exist in design and applications of special wettability in interfacial delivery and enrichment for detection of a few molecules are also discussed.

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Impact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions

arXiv

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arXiv 2019年

作者： Gao, Tenghua Qaiumzadeh, Alireza Troncoso, Roberto E. Haku, Satoshi An, Hongyu Nakayama, Hiroki Tazaki, Yuya Zhang, Song Tu, Rong Asami, Akio Brataas, Arne Ando, Kazuya Keio Institute of Pure and Applied Science Keio University Yokohama223-8522 Japan Department of Applied Physics and Physico-Informatics Keio University Yokohama223-8522 Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology TrondheimNO-7491 Norway School of Engineering and Sciences Universidad Adolfo Ibáñez Santiago Chile College of New Materials and New Energies Shenzhen Technology University Shenzhen518118 China Center for Spintronics Research Network Keio University Yokohama223-8522 Japan

Spintronic devices are based on heterojunctions of two materials with different magnetic and electronic properties. Although an energy barrier is naturally formed even at the interface of metallic heterojunctions, its impact on spin transport has been overlooked. Here, using diffusive spin Hall currents, we provide evidence that the inherent energy barrier governs the spin transport even in metallic systems. We find a sizable field-like torque, much larger than the damping-like counterpart, in Ni81Fe19/Bi0.1Sb0.9 bilayers. This is a distinct signature of barrier-mediated spin-orbit torques, which is consistent with our theory that predicts a strong modification of the spin mixing conductance induced by the energy barrier. Our results suggest that the spin mixing conductance and the corresponding spin-orbit torques are strongly altered by minimizing the work function difference in the heterostructure. These findings provide a new mechanism to control spin transport and spin torque phenomena by interfacial engineering of metallic heterostructures. Copyright © 2019, The Authors. All rights reserved.

关键词： Heterojunctions

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Styrene-terminated polyphenylene oxide and polybutadiene low dielectric reactive blend

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IOP Conference Series: materials Science and Engineering 2019年第1期699卷

作者： W Hu J Shen J Zhou W Jin W Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 P. R. China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 P. R. China

Styrene-terminated polyphenylene oxide (SPPO) and low polar thermosetting polybutadiene (PB) resin were employed to obtain a curing system with excellent electrical properties and enhanced thermal properties. By terminal styrenisation, SPPO is cured with PB, forming a continuous phase in the blend. The SPPO/PB blends have excellent solvent resistance and thermal stability, while the good dielectric performance is retained. Especially, when the mass ratio of PB is 0.5, the curing system has a high T g of 226.5°C and excellent dielectric properties with Dk = 2.46 and Df = 0.0022 at 10 GHz, which is suitable for high frequency electrical applications.

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