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Effect of layered-coupling in twisted WSe_(2) moiré superlattices

Nano Research 2023年第2期16卷 3435-3442页

作者： Biao Wu Haihong Zheng Shaofei Li Chang-Tian Wang Junnan Ding Jun He Zongwen Liu Jian-Tao Wang Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Recently,the discovery of a variety of moiré-related properties in the twisted vertical stacking of two different monolayers has attracted considerable *** introduction of small twist angles in transition metal dichalcogenide(TMD)heterostructures leads to the emergence of moirépotentials,which provide a fascinating platform for the study of strong interactions of *** there has been extensive research on moiréexcitons in twisted bilayer superlattices,the capture and study of moiréexcitons in homostructure superlattices with layer-coupling effects remain ***,we present the observation of moiréexcitons in the twisted 1L-WSe_(2)/1L-WSe_(2)and 1L-WSe_(2)/2L-WSe_(2)homostructures with various layer-coupling *** results reveal that the moirépotential increases(~260%)as the number of underlying layers decreases,indicating the effect of layer coupling on the modulation of the moiré*** effects of the temperature and laser power dependence as well as valley polarization on moiréexcitons were further demonstrated,and the crucial spectral features observed were *** findings pave the way for exploring quantum phenomena and related applications of quantum information.

关键词： twisted homostructures moirésuperlattices moirépotential layer-coupling

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Preparation and Thermal Stability of AlMoON Based Solar Selective Absorption Coating

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 854-862页

作者：闵捷 YUAN Wenxu CHEN Yufei LAN Yapeng YAN Mengdi LIU Hanze CHENG Xudong 代路 Hubei Provincial Key Laboratory of Green Materials for Light Industry Hubei University of TechnologyWuhan 430068China Col-laborative Innovation Center of Green Light-weight Materials and Processing Hubei University of TechnologyWuhan 430068China School of Materials and Chemical Engineering Hubei University of TechnologyWuhan 430068China School of Industrial Design Hu-bei University of TechnologyWuhan 430068China State Key Laboratory of Advanced Technology for Materials Synthesis and Process-ing Wuhan University of TechnologyWuhan 430070China Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design&Research InstituteWuhan 430205China

AlMoON based solar selective absorption coatings were deposited on stainless steel substrate by magnetron *** coatings included infrared reflection layer Mo,absorption layer AlMoN,absorption layer AlMoON and antireflection layer AlMoO from bottom to *** surface of the deposited coatings is flat without obvious *** absorptivity and emissivity are 0.896 and 0.09,respectively,and the quality factor is *** heat treatment at 500℃-36 h,the surface roughness of the coating increases,a small number of cracks and other defects appear,and the broken part is still attached to the coating surface.A certain degree of element diffusion occurs in the coatings,resulting in the decline of the optical properties of the *** absorptivity and emissivity are 0.883 and 0.131,respectively,the quality factor is 7.06,and the PC value is *** coatings do not fail under this condition and have certain thermal stability.

关键词： AlMoON coating preparation thermal stability

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Eliminating Hysteresis of Perovskite Solar Cells with Hollow CO_(2) Mesoporous Electron Transport Layer

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Chemical Research in Chinese Universities 2022年第1期38卷 117-122页

作者： HAN Wensheng WANG Yongling WAN Jiawei WANG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Graduate School of Science and Technology Gunma University 1-5-1 Tenjin-choKiryuGunma 376-8515Japan

Current density-voltage(J-V) hysteresis issue caused by unbalanced charge transport has greatly limited the improvement of power conversion efficiency(PCE) of halide perovskite solar cells(PSCs). Herein, hollow TiO2 mesoporous electron transport layer(ETL) was used to fabricate PSCs. The structure-dependent charge collection as well as its effect on PCE and hysteresis impactor(HI) of PSC were investigated. The results demonstrate that TiO2 hollow spheres in a size of around 50 nm (HS-50) can form a high quality perovskite/ETL interface with a less trap density. Moreover, the hollow TiO2 with the thin shell can help promote the extraction of electrons from perovskite layer to ETL, so as to reduce the charge accumulation and recombination at the perovskite/ETL interface and alleviate the hysteresis behavior. As a result, PSCs with HS-50 TiO2 delivered a champion PCE of 16.81% with a small HI of 0.0297, indicating a better performance than the commercial P25(PCE of 15.87%, HI of 0.2571).

关键词： Hollow structure Titanium dioxide Hysteresis Halide perovskite solar cell Charge collection

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Effect of Zn Transition Layer on Properties of Vacuum Deposited Zn-Mg Coating 3

Effect of Zn Transition Layer on Properties of Vacuum Deposi...

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2022 3rd International Conference on Mechanical engineering and Materials, ICMEM 2022

作者： Liu, Qiuyuan Qiu, Xiaopan Liu, Xin Zhao, Xingyuan Jiang, Sheming Zhang, Qifu Laboratory of Advanced Coating Technology for Metals China Iron and Steel Research Institute Group National Engineering Beijing100081 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

Zinc coatings have been served as a barrier and a galvanic protection for steel products for over a century. However, with the depletion of zinc resources, it becomes an urgent issue to obtain a new type of zinc coating that uses less zinc and has higher corrosion resistance. In order to develop Zn/ZnMg coatings with better corrosion resistance than traditional galvanized steel and suitable for advanced high strength steel, the vacuum thermal evaporation technique was used to simultaneously deposit Zn/ZnMg coating onto interstitial free steel plates and single-crystal silicon wafers in a high vacuum environment. The microstructure, morphology, adhesion and corrosion resistance behavior of the Zn/ZnMg coating were studied by scratch test, salt spray test and electrochemical method. The results shows that the grain size in the Zn/ZnMg coating tended to increase with the increase of the substrate temperature. After deposited the pure Zn transition layer, the adhesion of the coating has been obviously improved. When the substrate temperature was increased to 200°C, the obtained coating exhibited strong corrosion resistance. © Published under licence by IOP Publishing Ltd.

关键词： Corrosion resistance

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3D printing for tissue/organ regeneration in China

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Bio-Design and Manufacturing 2025年第2期8卷 169-242,I0001,I0002页

作者： Chaofan He Jiankang He Chengtie Wu Changshun Ruan Qi Gu Yongqiang Hao Yang Wu Shuo Bai Xiaoxiao Han Liliang Ouyang Jun Yin Hongzhao Zhou Zhuo Xiong Maobin Xie Lei Shao Jing Nie Liang Ma Cijun Shuai Changchun Zhou Xin Zhao Xuetao Shi Mengfei Yu Jiayin Fu Peng Wen Huixia Xuan Yuan Pang Yan’en Wang Yuan Sun Ziqi Gao Abdellah Aazmi Jingbo Zhang Tianhong Qiao Qixiang Yang Ke Yao Mao Mao Jianxin Hao Pinpin Wang Jirong Yang Huawei Qu Xinhuan Wang Xin Liu Shen Ji Shasha Liu Jingke Fu Bingxian Lu Mohan Wu Feng Chen Zihao Zheng Boqing Zhang Muyuan Chai Chaoying Zhang Mouyuan Sun Bo Peng Huayong Yang Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Research Center for Human Tissue and Organ Degeneration Institute of Biomedicine and BiotechnologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Organ Regeneration and Reconstruction State Key Laboratory of Membrane BiologyInstitute of ZoologyChinese Academy of SciencesBeijing 100101China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China Shanghai Engineering Research Center of Innovative Orthopaedic Instruments and Personalized Medicine Clinical and Translational Research Center for 3D Printing TechnologyShanghai 200011China School of Biomedical Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory of Biopharmaceutical Preparation and Delivery Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China National Engineering Research Centre for High Efficiency Grinding Hunan UniversityChangsha 410082China Biomanufacturing Center Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China The Fourth Affiliated Hospital of Guangzhou Medical University Guangzhou 511436China School of Biomedical Engineering Guangzhou Medic

As surgical procedures transition from conventional resection to advanced tissue-regeneration technologies,human disease therapy has witnessed a great leap *** particular,three-dimensional(3D)bioprinting stands as a landmark in this setting,by promising the precise integration of biomaterials,cells,and bioactive molecules,thus opening up a novel avenue for tissue/organ *** by the editorial board of Bio-Design and Manufacturing,this review brings together a cohort of leading young scientists in China to dissect the core functionalities and evolutionary trajectory of 3D bioprinting,by elucidating the intricate challenges encountered in the manufacturing of transplantable *** further delve into the translational pathway from scientific research to clinical application,emphasizing the imperativeness of establishing a regulatory framework and rigorously enforcing quality-control ***,this review outlines the strategic landscape and innovative achievements of China in this field and provides a comprehensive roadmap for researchers worldwide to propel this field collectively to even greater heights.

关键词： 3D printing Bioprinting Tissue engineering Regenerative medicine

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Liquid chemical looping gasification of biomass:Thermodynamic analysis on cellulose

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Chinese Journal of Chemical engineering 2021年第9期34卷 79-88页

作者： Wei Guo Bo Zhang Jie Zhang Zhiqiang Wu Yaowu Li Bolun Yang Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China Nuclear Power Institute of China Chengdu 610213China

Liquid chemical looping technology is an innovation of chemical looping conversion *** liquid metal oxide as the oxygen carrier during gasification process could prolong the service life of oxygen carrier and improve the process *** this paper,based on Gibbs minimum free energy method,the thermodynamic characteristics of biomass liquid chemical looping gasification were *** and lignin,the main components of biomass,were taken as the research *** oxide and antimony oxide were selected as liquid oxygen *** results showed that when the temperature increased from 600℃to 900℃,the output of H_(2)and CO in the products of cellulose gasification increased from 0.5 and 0.3 kmol to 1.3 and 2.6 kmol *** ratios of oxygen carriers to gasification raw materials had the best molar *** addition of steam in the system was beneficial to the increase of H_(2)content and the increase of H_(2)/CO molar ***_(2)O_(3)and Sb_(2)O_(3)with different mass ratios were used as mixed oxygen *** simulation results showed that the gasification temperature of biomass with different mixed oxygen carriers had the same equilibrium trend *** could be seen from the results of product distribution that the influence of the mixing ratio of Bi_(2)O_(3)and Sb_(2)O_(3)on gas product distribution could be *** results could provide simulation reference and data basis for subsequent research on liquid chemical looping gasification.

关键词： Liquid chemical looping conversion Biomass Thermodynamics Product distribution Oxygen carrier Simulation

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A drug-loaded composite coating to improve osteogenic and antibacterial properties of Zn-1Mg porous scaffolds as biodegradable bone implants

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Bioactive Materials 2023年第9期27卷 488-504页

作者： Zhenbao Zhang Aobo Liu Jiadong Fan Menglin Wang Jiabao Dai Xiang Jin Huanze Deng Xuan Wang Yijie Liang Haixia Li Yantao Zhao Peng Wen Yanfeng Li Department of Stomatology the Fourth Medical Center of PLA General HospitalBeijing100048China State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Medical School of Chinese PLA Beijing100039China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Senior Department of Orthopedics the Fourth Medical Center of PLA General HospitalBeijing100048China Beijing Engineering Research Center of Orthopedics Implants Beijing100048China Institute of Process Engineering Chinese Academy of SciencesBeijing100190China

Zinc(Zn)alloy porous scaffolds produced by additive manufacturing own customizable structures and biodegradable functions,having a great application potential for repairing bone *** this work,a hydroxyapatite(HA)/polydopamine(PDA)composite coating was constructed on the surface of Zn-1Mg porous scaffolds fabricated by laser powder bed fusion,and was loaded with a bioactive factor BMP2 and an antibacterial drug *** microstructure,degradation behavior,biocompatibility,antibacterial performance and osteogenic activities were systematically *** with as-built Zn-1Mg scaffolds,the rapid increase of Zn2+,which resulted to the deteriorated cell viability and osteogenic differentiation,was inhibited due to the physical barrier of the composite *** vitro cellular and bacterial assay indicated that the loaded BMP2 and vancomycin considerably enhanced the cytocompatibility and antibacterial *** improved osteogenic and antibacterial functions were also observed according to in vivo implantation in the lateral femoral condyle of *** design,influence and mechanism of the composite coating were discussed *** was concluded that the additively manufactured Zn-1Mg porous scaffolds together with the composite coating could modulate biodegradable performance and contribute to effective promotion of bone recovery and antibacterial function.

关键词： Additive manufacturing Biodegradable metal Zn-Mg alloy Porous scaffold Composite coating Bone repair

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Heteronuclear Bicentric Ionic Liquids Tailored for Mild Catalytic Conversion of Co2 into Cyclic Carbonates

SSRN

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SSRN 2024年

作者： Shabbir, Irfan Ndayambaje, Jean Damascene Dong, Li Su, Qian Cheng, Weiguo CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Zhengzhou Institute of Emerging Industrial Technology Henan Zhengzhou450000 China

The rapid increase of CO2 in the environment is creating severe climate catastrophes and rising ocean surfaces. Therefore, its reduction and green utilization into value-added materials is significant. Herein, heteronuclear bicentric pyridinium-based ionic liquids (BPyILs) tailored with different chain lengths and halogen anions have been synthesized and structurally characterized. The BPyILs were utilized as thermally stable, metal-free, and homogeneous catalysts to synthesize other cyclic organic carbonates (COCs) using various epoxides and sustainable, economical, and inert CO2, and their catalytic activity phenomenon has been discussed in detail. The results demonstrated that [TMGH+][ ̶O2MPy+][Br ̶] possesses Lewis acid-base bifunctional characteristics with strong nucleophilic active sites, which play an essential synergistic effect on the activation of CO2 and the ring-opening of epoxides. Various factors affecting the conversion and selectivity of catalysts, including reaction temperature, halide ion, catalyst amount, CO2 pressure, and reaction time, were further investigated. The results illustrated that under metal and solvent-free conditions, dual functionalized bicentric PyILs ([TMGH+][ ̶O2MPy+][Br ̶]) exhibited 99.7 % COC yield and 99.9 % selectivity at 90 oC temperature and 1 MPa CO2 pressure up to 4 h for the cycloaddition reaction between CO2 and propylene oxide (PO). At the same time, the turn-over frequency was as high as 10.1 h-1. Moreover, the versatility and recyclability of the catalyst were studied, and a plausible reaction mechanism was proposed. Compared to previously reported functionalized bicentric catalysts, [TMGH+][ ̶ O2MPy+][Br ̶ ] requires mild reaction conditions without using any metal, solvent, or co-catalyst, which demonstrates the bright prospect of synthesizing pyridinium-based bicentric (BPyILs) catalysts and its practical use in CO2 conversion, activation, and utilization. © 2024, The Authors. All rights reserved.

关键词： Ionic liquids

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Synergistic Separation Mechanisms of Impurities in Ionic Liquid Aqueous Solution from the Cellulose Regeneration process

SSRN

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SSRN 2025年

作者： Zou, Shengwang Wang, Junfeng Wu, Yingqiu Dong, Yanan Wang, Huijao Nie, Yi Xu, Hongxiang Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China Beijing100083 China

Ionic liquids (ILs) have shown significant potential for industrial application in the cellulose regeneration process. However, the accumulation of impurities, especially phosphorus (P) from the raw materials, in the ionic liquid (IL) aqueous solutions generated during the cellulose regeneration process, seriously affects the performance of IL and the quality of the final products. In this study, a crystallization precipitation method was employed to investigate the removal of impurities from IL aqueous solutions. The results demonstrated that the presence of IL accelerated the phase transformation of amorphous calcium phosphate to hydroxyapatite, although it prolonged the time to reach equilibrium. The highest P removal efficiency was achieved at a Ca/P molar ratio of 1.67:1, with an increase in pH further enhanced the removal efficiency. The morphology and size of crystallization precipitates were significantly influenced by the reaction time, pH, IL concentration, and temperature. By optimizing the reaction conditions, a P removal efficiency of 88.82% was achieved in IL aqueous solutions generated during the established hundred-ton-scale cellulose regeneration demonstration production line, with the process also exhibited synergistic removal capabilities for NO3-, SO42-, and Mg2+. These findings suggested that this method effectively removed the P and other inorganic impurities from the IL aqueous solutions generated during the cellulose regeneration process. © 2025, The Authors. All rights reserved.

关键词： Molar ratio

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A classical density functional approach to depletion interaction of Lennard-Jones binary mixtures

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Communications in Theoretical Physics 2022年第3期74卷 87-96页

作者： Yue Chen Wei Chen Xiaosong Chen CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Systems Science Beijing Normal UniversityBeijing 100875China

In this article,we apply classical density functional theory to investigate the characteristics of depletion interaction in Lennard-Jones(LJ)binary fiuid ***,to confirm the validity of our adopted density functional formalism,we calculate the radial distribution functions using a theoretical approach and compare them with results obtained by molecular dynamics ***,this approach is applied to two colloids immersed in LJ solvent *** investigate the variation of depletion interaction with respect to the distance of two colloids in LJ binary *** find that depletion interaction may be attractive or repulsive,mostly depending on the bulk density of the solvent and the temperature of the binary *** high bulk densities,the repulsive barrier of depletion force is remarkable when the total excluded volume of colloids touches each other and reaches a *** height of the repulsive barrier is related to the parameters of the LJ potential and bulk ***,the depletion force may exhibit attractive wells if the bulk density of the solvent is *** attractive well tends to appear when the surface-surface distance of colloids is half of the size of the polymer and deepens with temperature lowering in a fixed bulk *** contrast with the hard-sphere system,no oscillation of depletion potential around zero is observed.

关键词： molecular simulation density functional theory depletion interaction soft matter physics colloid-polymer mixtures

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