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Sym- and Asym-Expanded Heterohelicene Isomers Featuring Extended Multi-Resonance Skeleton for Narrowband Deep-Blue Fluorescence

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Angewandte Chemie - International Edition 2025年第13期64卷

作者： Zeng, Xuan Luo, Xiaofeng Meng, Guoyun Wang, Xuewen Zhang, Dongdong Duan, Lian School of Chemistry Chemical Engineering and Life Science State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing100084 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Center for Flexible Electronics Technology Tsinghua University Beijing100084 China

Expanded heterohelicenes composed of alternating linearly and angularly fused multi-resonance (MR) skeletons have gained wide interest owing to their promising narrowband emissions. Herein, a pair of sym- and asym-expanded heterohelicene isomers was obtained by merging boron/oxygen (B/O)-embedded MR triangulene and indolo[3,2,1-jk]carbazole units via one-pot synthesis. Owing to their fully resonating extended helical skeleton, the target heterohelicenes exhibit a significantly narrowed spectra bandwidth while emission red-shifting, thus affording deep-blue narrowband emission with a peak at approximately 460 nm, full-width-at-half-maximum (FWHM) of only 18 nm, and near-unity photoluminescence quantum yields. In comparison to the symmetrical structure, the asym-expanded heterohelicene displays suppressed aggregation within doped films, thereby showing superior narrowband electroluminescence in devices with CIE coordinates of (0.12, 0.18) and a high external quantum efficiency of up to 25 %, which retains 18.1 % even at a high luminance of 10,000 cd m−1. Overall, this work provides a novel paradigm for the development of narrowband expanded heterohelicenes. © 2025 Wiley-VCH GmbH.

关键词： Electroluminescence

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Prediction of Primary Dendrite Arm Spacing in Pulsed Laser Surface Melted Single Crystal Superalloy

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 485-494页

作者： Shiwei Ci Jingjing Liang Jinguo Li Haiwei Wang Yizhou Zhou Xiaofeng Sun Hongwei Zhang Yutian Ding Xin Zhou Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Space Manufacturing Technology(CAS Key Lab) Beijing100094China Taizhou Xinma Technology Industry Develepment Co.Ltd Taizhou318000China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of Technology287 Langongping RoadLanzhou730000China Science and Technology On Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an710000China

Primary dendritic arm spacing(PDAS)is an important microstructure feature of the nickel-base single crystal *** this paper,a numerical model predicting the PDAS evolution with additive manufacturing parameters using pulsed laser is established,which combines the theoretical PDAS models with the temperature field calculation model during pulsed laser *** on this model,processing maps that related process parameters to the evolution of PDAS are *** obtain more accurate prediction model,the parameters of different solidification conditions,G^(-0.5)V^(-0.25) and G^(-0.5)V^(-0.25),are selected to calculate *** simulation results show that the PDAS increases as the arise of P and *** processmgPDAS map can accurately predict the evolution of PDAS with pulsed laser process parameters,which is well in accordance with the experimental ***,the PDAS values calculated by the G^(-0.5)V^(-0.25) are more in line with the experimental results than those calculated by the G^(-0.5)V^(-0.25).

关键词： Additive manufacturing Nickel-base superalloy Single crystal Pulsed laser Primary dendritic arm spacing

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3D Positioning and Robot Assembly Method for Multi-plane Workpiece

3D Positioning and Robot Assembly Method for Multi-plane Wor...

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IEEE International Conference on Real-time Computing and Robotics (RCAR)

作者： Ruoyu Jia wKai Zhong Jintao Huang Xi Li Ruifeng Li Hua Luo Zhongwei Li State Key Lab. of Materials Processing and Die and Mould School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Xi’an Saineng Aerospace Automation Technology Co. Ltd. Xi’an China

Aiming at the assembly of workpieces with multiple plane structures, this paper proposes a 3D visual positioning and robot assembly method. First, several planes are extracted by plane detection and outlier removal algorithms; then the poses of the plane point clouds are calculated by the oriented bounding box algorithm; finally, the target plane is found through the length and width constraints. Based on proper hand-eye calibration and motion planning, the method can achieve the workpieces’ recognizing, positioning and assembly accurately, meanwhile has high computational efficiency and strong robustness. As shown in the experiment results, for the recognition and positioning accuracy, the translation error of the proposed method is less than 0.2mm, and the rotation error is less than 0.2°; for the robot assembly accuracy, the translation error of the proposed method is less than 0.8mm and the rotation error is less than 0.4°. Therefore, the proposed method can successfully satisfy the requirement of robot assembly tasks.

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Recent progress in perovskite solar cells:from device to commercialization

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Science China Chemistry 2022年第12期65卷 2369-2416页

作者： Xinhui Luo Xuesong Lin Feng Gao Yang Zhao Xiaodong Li Liqing Zhan Zexiong Qiu Jin Wang Cong Chen Lei Meng Xiaofeng Gao Yu Zhang Zijian Huang Rundong Fan Huifen Liu Yanrun Chen Xiaoxue Ren Jiahong Tang Chun-Hao Chen Dong Yang Yongguang Tu Xiao Liu Dongxue Liu Qing Zhao Jingbi You Junfeng Fang Yongzhen Wu Hongwei Han Xiaodan Zhang Dewei Zhao Fuzhi Huang Huanping Zhou Yongbo Yuan Qi Chen Zhaokui Wang Shengzhong(Frank)Liu Rui Zhu Jotaro Nakazaki Yongfang Li Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Experimental Center for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Jia

Perovskite solar cells(PSCs) are undergoing rapid development and the power conversion efficiency reaches 25.7% which attracts increasing attention on their commercialization *** this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and ***,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.

关键词： perovskite solar cells device engineering stability application

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Improved Anti-Adhesive Wear Performance of Cu/Al Pair Via Interfacial Energy Modulation

SSRN

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SSRN 2023年

作者： Lu, Tian-Tian Hua, Dong-Peng An, Bai-Ling Hafeez, Muhammad Arslan Pan, Jie Lu, Jun-Yong Zhou, Qing Zhang, Cheng Liu, Lin School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mold Technology Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Shaanxi Xi’an710072 China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430033 China

The prevention of adhesive wear between metals is challenging due to the strong adhesion forces that arise from the interaction of asperities. Here, we propose a novel approach to enhance the anti-adhesive wear performance of Cu/Al pair through interfacial energy modulation, with potential applications in electromagnetic railgun. Our findings indicate that the interfacial energy of the Cu-Al pair can be significantly reduced by magnetron sputtering a W thin film onto the Al alloy surface. A lower coefficient of friction and a substantial alleviation in adhesion and mechanical damage of the Cu alloy are thus obtained. Molecular dynamics simulations reveal that the immiscibility and low interfacial energy of the Cu/W pair result in the formation of an amorphous interfacial layer during friction, facilitating countermotion at the contacting surfaces, thus in turn enables the low friction. This study provides a guideline for designing novel wear-resistant pairs based on interfacial energy modulation. © 2023, The Authors. All rights reserved.

关键词： Adhesives

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用于先进交互式元宇宙平台的多模态集成传感和反馈指环系统

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Science Bulletin 2023年第2期68卷 133-135,M0003页

作者：何冠宇赫玉欣刘虎郭占虎 College of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China College of Chemical Engineering and Pharmaceutics Henan University of Science and TechnologyLuoyang 471023China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK

Nowadays,the newly interactive metaverse platform,which provides an immersive experience via the virtual reality(VR)technology that integrates the virtual world with the real world,shows huge potential applications in... 详细信息

关键词：指环多模态交互式

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Controllab.e preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen Limin He Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic *** a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric ***,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this *** this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal *** controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were *** samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 ***,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior reflection loss properties,the lowest reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 *** excellent microwave reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape *** study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss

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Domain Evolution, Dielectric and Piezoelectric Response in Bent Freestanding PbTiO3 Ferroelectric Nanowires

SSRN

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SSRN 2024年

作者： Zhou, Meng-Jun Peng, Kun Tan, Yueze Yang, Tiannan Chen, Long-Qing Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering Materials Research Institute The Pennsylvania State University University ParkPA16802 United States School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing100084 China

Ferroelectric oxides with excellent flexibility are of significant practical and theoretical interests in recent studies. With most up-to-date research efforts, the effect of large bending on properties of nano-scale ferroelectric materials is still to be investigated. In this work, we elucidate the effect of bending angle on ferroelectric domain structures and material properties of bending PbTiO3 nanowires using phase-field simulations and thermodynamic modeling. We find non-monotonic dependencies of the coercive fields, dielectric responses and piezoelectric properties on the bending angle. A maximum enhancement of 462% and 226% in the dielectric constant and piezoelectric coefficient, respectively, is achieved at an 18° bending angle for the PbTiO3 nanowire with a radius of R = 10 nm and length L=100 nm, which is attributed to the formation of strong-response zones within the nanowire as illustrated by both the phase-field and thermodynamic analysis. The current work provides useful theoretical insights for the experimental explorations into ferroelectric functionalities of nanomaterials and potential applications of high-performance flexible ferroelectric-based nanodevices. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

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Graphite emulsion with excellent dispersion stability and rheological property for drawing ultrafine tungsten wire

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Journal of materials Research and technology 2025年 36卷 9473-9480页

作者： Du Zhao Jun Xie Ranran Hou Qinqin Wei Fuguo Lai Buwei Wang Jian Zhang Guoqiang Luo Qiang Shen State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000 Guangdong PR China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 PR China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 PR China Hubei Longzhong Laboratory Xiangyang 441000 Hubei PR China Guangdong Xianglu Tungsten Industry Co. Ltd. Chaozhou 515633 PR China

The development of silicon wafers in the photovoltaic industry towards larger and thinner sizes requires ultrafine tungsten wires, and the uniform coating of high-performance graphite emulsion is the key to ensuring the quality of tungsten wires. However, existing graphite emulsion mainly depends on imports, and the limited domestic self-made graphite emulsion shows poor dispersion stability and nonuniform surface coating. This study provides a novel graphite emulsion with excellent dispersion stability and rheological property by introducing carboxymethyl cellulose (CMC). The graphite emulsion with 1.0 % CMC addition has the best dispersion stability, moderate viscosity, and excellent rheological properties. The steric hindrance effect produced by CMC polymer improves the dispersion stability, while the bridges and entanglements of CMC chains regulate the viscosity to ensure uniform coating. The resulted drawn tungsten wire exhibits a large free circle diameter and good surface quality. This work provides a theoretical basis for the preparation of high-performance emulsion and improving the quality of metal wire drawing.

关键词： Graphite emulsion CMC Dispersion stability Rheological property

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Activating lattice oxygen of two-dimensional MnXn-1O2 MXenes via zero-dimensional graphene quantum dots for water oxidation

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Science China materials 2022年第11期65卷 3053-3061页

作者： Yiyuan Ma Yurong An Zhuo Xu Laifei Cheng Wenyu Yuan Science and Technology on Thermostructural Composite Materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solidification Processing School of Material Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid ChemistrySchool of Chemistry&Chemical EngineeringShaanxi Normal UniversityXi’an 710062China

The poor oxygen evolution reaction(OER)activity of two-dimensional(2 D)transition metal carbides(MXenes)is a major obstacle to their application in highperformance water splitting and fuel cells due to the high energy barriers for the absorption of ***,we demonstrate that the lattice oxygen of M_(n)X_(n-1)O_(2)MXenes can be activated by 0 D graphene quantum dots(GQDs),thereby activating the OER via the lattice-oxygen oxidation mechanism(LOM)instead of the conventional adsorbate evolving *** pH-dependent OER activity of M_(n)X_(n-1)O_(2)@GQDs and ^(18)O isotope-lab.lling experiments with time-of-flight secondary-ion mass spectrometry(TOF-SIMS)provide the direct evidence of ***,the activated lattice oxygen amount can be controlled by the *** as-prepared 0 D/2 D Ti_(3)C_(2)O_(2)@GQDs heterostructure delivers a highly reduced overpotential of 390 mV(bare Ti_(3)C_(2)O_(2):530 mV)at a benchmark current density of 10 mA cm^(-2).Through optimizing the thickness and the additional conductive substrate,the overpotential at 10 mA cm^(-2)decreases to 250 mV,while the Tafel slope is reduced to 39 mV dec^(-1);these values indicate the as-prepared heterostructure is superior to the state-of-the-art MXene-based OER *** work provides a new strategy to enhance the OER activity of M_(n)X_(n-1)O_(2)and extends the application of LOM from perovskite to MXenes.

关键词： graphene quantum dots lattice-oxygen activation oxygen evolution reaction water splitting heterostructure

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