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Carbon Fiber composite Honeycomb Structures and the Application for Satellite Antenna Reflector with High Precision

Advances in Astronautics science and technology 2022年第4期5卷 423-441页

作者： Wei, Xingyu Wang, Yan Xue, Pengcheng Zhang, Taotao Rouis, Abir Xiao, Wei Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China Beijing Institute of Spacecraft System Engineering Beijing 10000 China

This article summarizes the composite honeycomb structure which possess important meaning and application value on the high-precision satellite antenna reflector. The key technologies of composite material honeycomb structure are summarized, including the material selection for satellite antenna reflector, honeycomb configuration, fabrication process, mechanical properties, lightweight design, surface accuracy, thermal deformation control and other issues. The development goal of “lighter, larger, more refined and more stable” are put forward after looking forward to the manufacturing technology and functional requirement of the future satellite antenna reflector. © 2022, Chinese Society of Astronautics.

关键词： composite honeycomb material Fabrication method Mechanical property Sandwich structure Satellite antenna reflector

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π-Stacked host materials based on spirofluorene scaffolds for warm white OLEDs achieving 94.7 lm W^(-1) at 1,000 cd m^(-2)

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science China Chemistry 2022年第11期65卷 2219-2230页

作者： Yuan-Lan Zhang Sheng-Yi Yang Zi-Qi Feng Yang-Kun Qu Dong-Ying Zhou Cheng Zhong Liang-Sheng Liao Zuo-Quan Jiang Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Soochow UniversitySuzhou 215123China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityMacao 999078China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyWuhan 430072China

Power efficiency(PE)at high brightness is considered as the rigorous standard of high-quality white organic light-emitting diodes(WOLEDs),for which the host material plays a significant role in energy conservation for practical lighting ***,PE is successfully enhanced to a new level through the method ofπ-stacked host molecular with spirofluorene *** design host materials by confining two donor units in a very short distance to enlarge theπ-electron spatial delocalization for facilitating the hole hopping process and engaging a rigid donor as the space-lock to suppress the quenching effect as well as induce host bipolar *** on this unique molecular design,the red,green,and blue(RGB)monochromic organic lightemitting diodes(OLEDs)demonstrate high external quantum efficiencies(EQEs)of 28.4%,26.0%,and 31.2%with ultralow roll-off,*** encouragingly,the warm WOLEDs achieve record-high current efficiency(CE)of 109.5 cd A^(-1),PE of 109.1 lm W^(-1),and EQE of 32.9%.Even under operating brightness of 1,000 cd m^(-2),the devices can still realize 94.7 lm W^(-1)of PE,which represents the highest applicable PE value in the reported WOLEDs and for the first time single-host based WOLEDs with a performance exceeding that of a conventional fluorescent tube(70 lm W^(-1))without any light-extraction technique.

关键词： white organic light-emitting diodes power efficiency universal host single-EML

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Programming an efficient technique for designing smart C-doped MIC with dual self-protection forinformation and high-energy

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Rare Metals 2024年第12期43卷 6694-6703页

作者： Xiao-Gang Guo Tao-Tao Liang Hui-Sheng Huang Bin-Fang Yuan Fu-Lan Zhang Yi-Huang Chen Lu Liu Xun Cui Chongqing Key Laboratory of Inorganic Special Functional Materials College of Chemistry and Chemical EngineeringYangtze Normal UniversityChongqing408100China Department of Orthopedic Surgery Chongqing Sports Medicine CenterSouthwest HospitalThe Third Military Medical UniversityChongqing400038China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and ResearchSingapore627833Singapore State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan430200China

Constructing self-protected metastable intermolecular composites(MICs) enables the regulation of microstructures towards boosting controllable detonation performance,and also prevents information leakage,which is meaningful but ***,a convenient and efficient method of combining highly-controlled electrophoretic assembly,surface modification and microwave heat treatment was employed to design promising heattriggered wettability switchable high-energy smart C-doped Al/Cr_(2)O_(3)MIC,and surface modification mechanism was proposed,*** anti-wetting ability of the product was demonstrated by a series of tests of water contact angle,impact resistance,immersion,selfcleaning,*** key information recording/encryption procedures were realized by constructing a hydrophilic/hydrophobic interface and adjusting the wettability of the *** addition,the output heat of asobtained smart MIC can reach ~1.5 kJ·g^(-1),and its attenuation rate was only ~30% even after underwater aging,further verifying its potential ***,our design provides a promising strategy for engineering smart MIC with diversified functional structures for blasting applications and beyond.

关键词： High-energy MIC Information self-protection Exothermicity Stability

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Observation of Topological Transition in Floquet Non-Hermitian Skin Effects in Silicon Photonics

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Physical Review Letters 2024年第7期133卷 073803-073803页

作者： Zhiyuan Lin Wange Song Li-Wei Wang Haoran Xin Jiacheng Sun Shengjie Wu Chunyu Huang Shining Zhu Jian-Hua Jiang Tao Li National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulations Jiangsu Key Laboratory of Artificial Functional Materials School of Physics College of Engineering and Applied Sciences School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology School of Biomedical Engineering Suzhou Institute for Advanced Research School of Physics

Non-Hermitian physics has greatly enriched our understanding of nonequilibrium phenomena and uncovered novel effects such as the non-Hermitian skin effect (NHSE) that has profoundly revolutionized the field. NHSE has been predicted in systems with nonreciprocal couplings which, however, are challenging to realize in experiments. Without nonreciprocal couplings, the NHSE can also emerge in systems with coexisting gauge fields and loss or gain (e.g., in Floquet non-Hermitian systems). However, such Floquet NHSE remains largely unexplored in experiments. Here, we realize the Floquet NHSEs in periodically modulated optical waveguides integrated on a silicon photonic platform. By engineering the artificial gauge fields induced by the periodical modulation, we observe various Floquet NHSE phases and unveil their rich topological transitions. Remarkably, we discover the transitions between the unipolar NHSE phases and an unconventional bipolar NHSE phase, which is accompanied by the directional reversal of the NHSEs. The underlying physics is revealed by the band winding in complex quasienergy space which undergoes a topology change from isolated loops with the same winding to linked loops with opposite windings. Our work unfolds a new route toward Floquet NHSEs originating from the interplay between gauge fields and dissipation effects, and thus offers fundamentally new ways for steering light and other waves.

关键词： Edge states Integrated optics Topological effects in photonic systems Floquet systems Non-Hermitian systems Waveguide arrays

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高效光催化二氧化碳还原钻单原子催化剂的多尺度结构工程

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science China Materials 2024年第4期67卷 1292-1300页

作者：王榆惠郑天宇金昱丞孙婷婷丁旭王萧徐清梅李彤轩张少龙姜建壮 Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

人工光合作用将二氧化碳转化为增值化学品和燃料,在克服全球环境能源危机方面具有巨大潜力.然而,由于CO_(2)的热力学稳定性和动力学滞后性,开发高效的CO_(2)RR光催化剂是一个巨大的挑战.本文在微介孔氮掺杂碳(0.8-Co-ISAS/MMNC-900)上... 详细信息

人工光合作用将二氧化碳转化为增值化学品和燃料,在克服全球环境能源危机方面具有巨大潜力.然而,由于CO_(2)的热力学稳定性和动力学滞后性,开发高效的CO_(2)RR光催化剂是一个巨大的挑战.本文在微介孔氮掺杂碳(0.8-Co-ISAS/MMNC-900)上制备了一种具有高度分散Co单原子位的分级多孔钴单原子光催化剂,该催化剂显著促进了CO_(2)-to-CO的光还原.0.8-Co-ISAS/MMNC-900催化剂的CO生成速率高达7261μmol g^(-1)h^(-1),CO选择性高达90.1%,并且在四次循环测试中表现出良好的稳定性.实验数据和理论结果表明,分层多孔结构可以促进电荷分离引起的外部局部电场的形成,Co隔离的单原子位和微介孔构型协同作用,促进光激发电子积累、CO_(2)吸附活化和*COOH中间体的形成.本研究通过多尺度多孔结构工程,提出了一种合成CO_(2)还原光催化剂的新策略.

关键词：单原子热力学稳定性激发电子光还原多尺度结构人工光合作用多孔结构电荷分离

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Origin of low coercivity of high La-Ce-containing Nd-Fe-B sintered magnets

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Rare Metals 2021年第1期40卷 180-184页

作者： Zhi Li Yu-Qing Li Wei-Qiang Liu Dan Wu Hao Chen Wei-Xing Xia Ming Yue College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo 315201China

The origin of low coercivity of high La-Cecontaining Nd-Fe-B sintered magnets was analyzed based on characterization of the microstructure,magnetic domain structure,and magnetization reversal *** can be found that the coercivity of magnet decreases sharply and the ratio value of coercivity(H_(cj))to anisotropic field(H_(A))is below the theoretical value when the amount of La-Ce substitution for Nd is more than 40 wt%.The grain boundaries with poor magnetic isolation in the high La-Cecontaining Nd-Fe-B sintered magnets play an important role in reducing the coercivity of the *** addition,a larger proportion of the reversible portions can be found for the magnet with a large content of La-Ce,which will lead to the low performance of the magnet.

关键词： La-Ce-containing Nd-Fe-B sintered magnets Magnetic properties Magnetic domain Magnetization reversal

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One-step preparation of modified photothermal-driven melamine foam with gradient wettability for oil-waterseparation

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Frontiers of Materials science 2024年第3期18卷 71-82页

作者： Mengdan Jia Mei-Chen Lin Hai-Tao Ren Bing-Chiuan Shiu Ching-Wen Lou Zhi-Ke Wang Li-Yan Liu Ting-Ting Li Innovation Platform of Intelligent and Energy-Saving Textiles School of Textile Science and EngineeringTiangongUniversityTianjin 300387China Tianjin and Ministry of Education Key Laboratory for Advanced Textile Composite Materials Tiangong UniversityTianjin 300387China Department of Biomedical Engineering College of Biomedical EngineeringChina Medical UniversityTaichung 404333China College of Material and Chemical Engineering Minjiang UniversityFuzhou 350108China Department of Bioinformatics and Medical Engineering AsiaUniversityTaichung 413305China Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung 404333China Advanced Medical Care and Protection Technology Research Center College of Textile and ClothingQingdaoUniversityQingdao 266071China Department of Textile and Clothing Shandong Vocational College of Science and TechnologyWeifang 261053China

The absorption of high-viscosity oil by traditional oil absorbing materials has always been a *** there is an urgent need to solve the problem of slow absorption of high-viscosity *** this work,an emulsion composed of polydimethylsiloxane(PDMS),carbon black(CB)and waterborne polyurethane(solid content 40%)was sprayed on the melamine foam(MF).After volatilization of organic solvents,the photothermal material CB was fixed on the MF framework,making it *** raising the temperature of the modified foam to accelerate the internal thermal movement of high-viscosity oil molecules around the foam,intermolecular forces are reduced,thereby accelerating the separation *** absorption capacity of this modified MF towards organic solvents and oil is up to 79 times its own *** addition,the mechanical properties of the modified foam are improved to a certain extent,more conducive to the continuous oil-water *** photothermal absorption material provides ideas for the rapid removal of high-viscosity oil,heavy oil,etc.

关键词： photothermal high-viscosity oil oil-water separation

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Laser-induced breakdown spectroscopy as a method for millimeter-scale inspection of surface flatness

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Plasma science and technology 2024年第9期26卷 148-155页

作者： Jinrui YE Yaju LI Zhao ZHANG Xinwei WANG Kewei TAO Qiang ZENG Liangwen CHEN Dongbin QIAN Shaofeng ZHANG Lei YANG Xinwen MA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000People’s Republic of China Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000People’s Republic of China University of the Chinese Academy of Sciences Beijing 100049People’s Republic of China Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070People’s Republic of China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

A non-contact method for millimeter-scale inspection of material surface flatness via Laser-Induced Breakdown Spectroscopy(LIBS)is investigated *** experiment is performed using a planished surface of an alloy steel sample to simulate its various flatness,ranging from 0 to 4.4 mm,by adjusting the laser focal plane to the surface distance with a step length of 0.2 *** is found that LIBS measurements are successful in inspecting the flatness differences among these simulated cases,implying that the method investigated here is *** is also found that,for achieving the inspection of surface flatness within such a wide range,when univariate analysis is applied,a piecewise calibration model must be *** is due to the complex dependence of plasma formation conditions on the surface flatness,which inevitably complicates the inspection *** solve the problem,a multivariate analysis with the help of Back-Propagation Neural Network(BPNN)algorithms is applied to further construct the calibration *** detailed analysis of the model performance,we demonstrate that a unified calibration model can be well established based on BPNN algorithms for unambiguous millimeter-scale range inspection of surface flatness with a resolution of about 0.2 mm.

关键词： laser-induced breakdown spectroscopy machine learning surface flatness

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Optimization of the in vitro biodegradability,cytocompatibility,and wear resistance of the AZ31B alloy by micro-arc oxidation coatings doped with zinc phosphate

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Journal of Materials science & technology 2024年第12期179卷 224-239页

作者： Chao Yang Suihan Cui Ricky KYFu Liyuan Sheng Min Wen Daokui Xu Ying Zhao Yufeng Zheng Paul KChu Zhongzhen Wu School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China Department of Physics Department of Materials Science&Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong Kong 999077China Shenzhen Institute Peking UniversityShenzhen 518057China PKU-HKUST Shenzhen–Hong Kong Institution Shenzhen 518057China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China

As implanted bone fixation materials,magnesium(Mg)alloys have significant advantages because the density and elastic modulus are closest to those of the human bone and they can bio-degrade in the physiological ***,Mg alloys degrade too rapidly and uncontrollably thus hampering clinical *** this study,a highly corrosion-resistant zinc-phosphate-doped micro-arc oxidation(MAO)coating is prepared on the AZ31B alloy,and the degradation process is assessed in *** increasing zinc phosphate concentrations,both the corrosion potentials and charge transfer resistance of the AZ31B alloy coated with MAO coatings increase gradually,while the corrosion current densities di-minish *** tests in the simulated body fluid(SBF)reveal that the increased zinc phos-phate concentration in MAO coating decreases the degradation rate,consequently reducing the release rates of Mg^(2+)and OH-in the physiological micro-environment,which obtains the lowest weight loss of only 5.22%after immersion for 56 *** regulation of degradation provides a weak alkaline environment that is suitable for long-term cell growth and subsequent promotion of bone proliferation,differentiation,mineralization,and *** addition,the zinc-phosphate-doped MAO coat-ings show an improved wear resistance as manifested by a wear rate of only 3.81 x 10^(-5) mm^(3) N^(-1) m^(-1).The results reveal a suitable strategy to improve the properties of biodegradable Mg alloys to balance tissue healing with mechanical degradation.

关键词： Mg alloys MAO coatings Degradation regulation Cytocompatibility Wear resistance

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边缘电子态调制实现效率超过15%的锡基钙钛矿太阳电池（英文）

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science China Materials 2025年第5期68卷 1462-1471页

作者：左晨刘庚灵刘聪龚安稳陈凯钟杨徐鑫熊文涛狄大卫胡笑添刘焘谈利承邹炳锁陈义旺 State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi University Key Laboratory of Bioinorganic and Synthetic Chemistry (Mo 5 Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen University Institute of Polymers and Energy Chemistry (IPEC)/Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC) Nanchang University DGUT-CNAM Institute Dongguan University of Technology State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University

锡基钙钛矿的严重p型掺杂效应和本征缺陷极大地限制了锡基钙钛矿太阳电池（PSCs）器件性能.本研究提出了一种新型n型有机小分子掺杂剂, NDI2HD-Br2,以缓解锡基钙钛矿的严重p型自掺杂并钝化锡相关缺陷. NDI2HD-Br2中具有高电子密度的羰基... 详细信息

锡基钙钛矿的严重p型掺杂效应和本征缺陷极大地限制了锡基钙钛矿太阳电池（PSCs）器件性能.本研究提出了一种新型n型有机小分子掺杂剂, NDI2HD-Br2,以缓解锡基钙钛矿的严重p型自掺杂并钝化锡相关缺陷. NDI2HD-Br2中具有高电子密度的羰基（C=O）可以向钙钛矿带边提供额外的电子,从而将锡基钙钛矿从p型转化为弱n型半导体（费米能级上移0.15 eV）.通过这种方法,锡基PSCs的功率转换效率（PCE）达到15.01%,开路电压高达0.95 V.此外,掺入NDI2HD-Br2的器件具有出色的长期稳定性,在氮气环境中存储1500小时后仍能保持81%的初始PCE.这项研究为调控锡基钙钛矿的电子结构并钝化其本征缺陷以实现高效稳定的太阳能电池提供了一条新途径.

关键词： perovskite solar cells tin electron transfer defects weak n-type

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