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Space Solar Power and Wireless Transmission 2025年第1期2卷 54-64页

作者： Shuo Bian Size Ai Jianzheng Wei Zhimin Xie Guochang Lin Dongjie Zhang Huifeng Tan Qingxiang Ji Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Université de Franche-Comté Institute FEMTO-ST CNRS Besançon 25000 France

With the growing global energy demand and the pursuit of sustainable energy, solar energy has received widespread attention as a clean and renewable energy source. A structural design of an inflatable, large-scale solar concentrating reflector based on in-orbit assembly is proposed in this paper. The axisymmetric inflated reflector surface is inversely designed through membrane mechanics, and the internal pressures to maintain the reflector surface morphology at different orbital positions and the tiny deformation produced by the reflecting surface under the action of the uniform pressure are determined. A inflatable-rigidizable support structure is prepared by using a rigidizable aramid fabric-reinforced composite. The support structure used to the parabolic reflecting surface is designed, and the diameter and spacing distance of the resistance wire of the heating layer are determined by electrothermal simulation; the combination of solar radiation and electric heating is used to rigidize the reflector in orbit, and the corresponding electric heating time at different orbital positions is also analyzed by in orbit simulation. The heating voltage, folding radius and folding method of the rigidizable support structure are determined through the experimental design, and the folding and deployment experiments are carried out by using the heating and internal pressure and the final shape recovery rate of the support tube is approximately 100 %, which verifies the feasibility of its folding and deployment.

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Unraveling the advances of trace doping engineering for potassium ion battery anodes via tomography

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Journal of Energy Chemistry 2021年第7期30卷 355-363页

作者： Zhenjiang Yu Ruhong Li Kedi Cai Yudong Yao Junjing Deng Shuaifeng Lou Mi Lu Qinmin Pan Geping Yin Zaixing Jiang Jiajun Wang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina Liaoning Engineering Technology Research Center of Supercapacitor Bohai UniversityJinzhou 121013LiaoningChina Advanced Photon Source Argonne National LaboratoryLemontIL 60439USA Key Laboratory of Functional Materials and Applications of Fujian Province School of Materials Science and EngineeringXiamen University of TechnologyXiamen 361024FujianChina

Doping have been considered as a prominent strategy to stabilize crystal structure of battery materials during the insertion and removal of alkali *** instructive knowledge and experience acquired from doping strategies predominate in cathode materials,but doping principle in anodes remains ***,we demonstrate that trace element doping enables stable conversion-reaction and ensures structural integrity for potassium ion battery(PIB) *** a synergistic combination of X-ray tomography,structural probes,and charge reconfiguration,we encode the physical origins and structural evolution of electro-chemo-mechanical degradation in PIB *** the multiple ion transport pathways created by the orderly hierarchical pores from "surface to bulk" and the homogeneous charge distribution governed in doped nanodomains,the anisotropic expansion can be significantly relieved with trace isoelectronic element doping into the host lattice,maintaining particle mechanical *** work presents a close relationship between doping chemistry and mechanical reliability,projecting a new pathway to reengineering electrode materials for next-generation energy storage.

关键词： Trace doping Conversion-type electrode Structural evolution X-ray imaging Hierarchical integrity

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Synergy of Interfacial Reinforcing and Damage Monitoring at Elevated Temperature by Constructing Fluorescence Interphase of Perylenediimide Nanowires in Carbon Fiber/Bismaleimide composites

SSRN

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SSRN 2024年

作者： Sun, Yuhang Su, Qingfu Li, Gang Yang, Xiaoping Zuo, Xiaobiao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Changzhou Institute of Advanced Materials Beijing University of Chemical Technology Changzhou213164 China National Engineering Research Center of Functional Carbon Composite Aerospace Research Institute of Materials & Processing Technology Beijing100076 China

Amino-terminated perylenediimide (PDI) was designed and used to construct molecular assembly interphase with high temperature resistance and fluorescence on modified carbon fiber (CF-PDI) surface, and the correlations of the novel interphase with interfacial reinforcement and damage monitoring of carbon fiber/bismaleimide (CF/BMI) composites at 25 ℃, 100 ℃, 200 ℃ and 250 ℃ were investigated. Reticular nanowire structures from PDI self-assembly were observed on CF-PDI surface, leading to the increase of chemical activity and roughness of fiber surface. The partial detachment and decreased surface activity of the nanowire structures of PDI assembly on CF-PDI surface appeared with increasing the temperature, resulting from the weakening of π-π stacking and sectional breakage of intermolecular hydrogen bonding at high temperature. Compared with CF-desized composites, transverse fiber bundle tensile strength and interfacial shear strength were increased by 76.6% and 52.2% at 250 ℃, which was ascribed to the enhanced interfacial bonding between PDI nanowires and BMI matrix. The confocal laser scanning microscope images and grayscale color maps showed the strong green fluorescence on CF-PDI surface and its composites at 25 ℃, while the fluorescence intensity was gradually decreased with the increase of temperature. The fluorescence disappearance of damage region after low-velocity impact damage was observed at 200 ℃ and 250 ℃, which realized damage monitoring at high temperature in CF/BMI composites. © 2024, The Authors. All rights reserved.

关键词： Carbon fibers

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Dominant p-wave pairing induced by nearest-neighbor attraction in the square-lattice extended Hubbard model

arXiv

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arXiv 2024年

作者： Cao, Zhangkai Li, Jianyu Su, Jiahao Ying, Tao Tang, Ho-Kin School of Science Harbin Institute of Technology Shenzhen518055 China Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Shenzhen518055 China School of Physics Harbin Institute of Technology Harbin150001 China

The two-dimensional (2D) Hubbard model is widely believed to capture the key ingredients of high-temperature superconductivity in cuprate materials. Here, we report a constrained path quantum Monte Carlo study of the square-lattice extended Hubbard model with on-site Coulomb repulsion U and nearest-neighbor (NN) electron attraction V. Upon doping δ = 0.125, we find that NN electron attraction V significantly promotes an exotic spin-triplet (p-wave) pairing, with the p-wave pairing correlations growing stronger as V increases. In the meanwhile, the dx2−y2-wave (d-wave) pairing in the intermediate coupling regime shows insignificant response to the increase of V. The spin density wave order, which is observed near half-filling in the particle-hole channel, is also almost unaffected by the NN electron attraction V, reinforcing the established relationship between d-wave superconductivity (SC) and spin order. As the doping becomes heavier (i.e., δ increases), the dominant region of p-wave pairing expands, further suppressing the presence of d-wave pairing. Our work suggests the p-wave pairing region can be induced and further broadened by the NN electron attraction V, offering a feasible mechanism to realize p-wave SC in realistic cuprate materials. © 2024, CC BY.

关键词： Hubbard model

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(Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al2O3

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Journal of Materials science & technology 2020年第4期39卷 167-172页

作者： Zifan Zhao Heng Chen Huimin Xiang Fu-Zhi Dai Xiaohui Wang Wei Xu Kuang Sun Zhijian Peng Yanchun Zhou School of Engineering and Technology China University of GeosciencesBeijing 100083China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Chenhua Science and Technology Corporation Limted Shanghai 201804China

Al2O3f/Al2O3 ceramic matrix composites(CMC)are promising candidate materials of blades and combustor liners of future gas turbines in light of their higher temperature capability,higher environmental stability and oxidizing-free capacity[1–3].Nevertheless,grain growth,sintering and creep deformation at high operation temperatures are still serious problems for Al2O3f/Al2O3 ceramic matrix composites,which can lead to a reduction in the strength and damage tolerance[2].Moreover,Al2O3 can be corroded by the high temperature water vapor in combustion environments and yields volatile products,such as Al(OH)3[4].Consequently,environmental barrier coatings(EBCs)are necessary for Al2O3f/Al2O3 ceramic matrix composites,which can protect Al2O3f/Al2O3 CMC from high temperature and flowing combustion gas corrosion and thus increase the high temperature capability and the service life of components.

关键词： Al2O3f/Al2O3 ceramic matrix conductivity close thermal expansion

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Ta_(4)HfC_(5)-Si_(2)BC_(3)N复相陶瓷的界面结构和晶粒生长行为

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science China Materials 2023年第11期66卷 4306-4316页

作者：关景怡李达鑫周国相段文久杨治华贾德昌 Ralf Riedel 秦少华周玉 Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150000China Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Chongqing Research Institute of HIT Chongqing 401135China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China Institut für Materialwissenschaft Technische Universität DarmstadtDarmstadt D-64287Germany School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

超高温陶瓷(UHTC)Ta_(4)HfC_(5)因其优异的热物理和热机械性能而成为适用于高超音速飞行器最有前途的候选材料之一.然而,较差的烧结能力限制了其潜在的使用.为了克服该障碍,采用Si_(2)BC_(3)N陶瓷对钽-铪碳化物固溶体进行了致密化处理.... 详细信息

超高温陶瓷(UHTC)Ta_(4)HfC_(5)因其优异的热物理和热机械性能而成为适用于高超音速飞行器最有前途的候选材料之一.然而,较差的烧结能力限制了其潜在的使用.为了克服该障碍,采用Si_(2)BC_(3)N陶瓷对钽-铪碳化物固溶体进行了致密化处理.通过热压烧结合成了致密的Ta_(4)HfC_(5)-Si_(2)BC_(3)N陶瓷,所得复相陶瓷由Ta_(4)HfC_(5),SiC和BN(C)相组成.在2100℃下,随着晶粒的快速生长,陶瓷内形成了“蝌蚪”状的SiC和BN(C)连接相,断裂韧性提高到3.47±0.12 MPa m^(1/2).随着烧结温度的升高,Ta_(4)HfC_(5)晶粒的生长活化能从112.4 kJ mol^(−1)增加到250.7±29.3 kJ mol^(−1).

关键词： Ta_(4)HfC_(5)-Si_(2)BC_(3)N ceramic interface behavior growth kinetics mechanical properties

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Narrow-linewidth BaGa_(4)Se_(7) optical parametric oscillator

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Chinese Optics Letters 2022年第4期20卷 54-59页

作者： Jintian Bian Hui Kong Qing Ye Jiyong Yao Lei Guo Xiaoquan Sun State Key Laboratory of Pulsed Power Laser Technology National University of Defense TechnologyHefei 230037China Advanced Laser Technology Laboratory of Anhui Province Hefei 230037China Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Mechanics and Photoelectric Physics Anhui University of Science and TechnologyHuainan 232001China

The linewidth of the BaGa_(4)Se_(7)(BGSe)optical parametric oscillator(OPO)was narrowed for the first time,to the best of our knowledge,by inserting a Fabry-Perot(FP)etalon into an L-shaped *** a 15 mm long BGSe(56.3°,0°)was pumped by a 1064 nm laser,the peak wavelength was〜3529 nm,and the linewidth was 4.53 nm[3.64 cm^(-1)]under type I phase *** inserting a 350μm thick FP etalon,the linewidth was decreased to 1.27-2.05 *** the tilt angle of the etalon was 2.34°,the linewidth was 2.05 nm[1.65 cm^(-1)],and the peak wavelength was still〜3529 *** the tilt angle of the etalon was 3.90°,the peak wavelength was 3534.9 nm,and the linewidth was 1.27 nm(1.02 cm^(-1)),which was the narrowest linewidth of a BGSe OPO,to the best of our *** beam quality was also improved after inserting the FP etalon.

关键词： optical parametric oscillation narrow linewidth BaGa_(4)Sc_(7)

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Simultaneous Engineering of the Conductivity and Work Function of Biphenylene Via Fluorine Adsorption

SSRN

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SSRN 2023年

作者： Zhang, Jiao Xie, Ying Tang, Yinan Qian, Yinyin He, Jing Wang, Zhe Zhang, Yanchang Chen, Jiankang Yang, Lin Zheng, Bing School of Chemistry and Materials Science Heilongjiang University Harbin150080 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

Biphenylene (BP) is a new member of the two-dimensional C nanomaterial family, and successful fabrication of BP offers an excellent opportunity for developing innovative C-based electronics. However, its unusual metallicity critically restricts its applications in field-effect transistors (FETs) and photocatalysis. Simultaneously, its relatively low work function ( ,4.33 eV) seriously restricts its applications in anode materials of electronic devices. Therefore, understanding the tunabilities of electronic properties and of BP-based nanomaterials is crucial to guide experimental exploration;nevertheless, to date, little attention has been paid to this area. Herein, we theoretically demonstrate that conductivity of fluorinated BP (Fn-BP) evolves in the order metallic → semimetallic → semiconductivity with increasing F concentration, attributed to a bonding transition of BP (sp2 → sp2 + sp3 → sp3). Particularly, of BP can be significantly improved (4.82–6.97 eV) by fluorination, approximately two-fold higher than that of Fn-graphene owing to p electron transfer between F and BP. Consequently, metallic F2D-BP and F4S-BP with favorable s can be utilized as substitutes for Au and Pt anodes, respectively. Specifically, F8D-BP, F16D-BP, and F24D-BP with exceptional band gaps of 0.40, 2.80, and 3.44 eV, respectively, exhibit high potentials for making channel materials in FETs, candidate materials in photocatalysis, and buffer layers in solar cells, respectively. © 2023, The Authors. All rights reserved.

关键词： Electronic structure

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How do molecular interactions affect fluorescence behavior of AIEgens in solution and aggregate states?

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science China Chemistry 2022年第1期65卷 135-144页

作者： Ying Yu Hao Xing Zhicong Zhou Junkai Liu Herman H-YSung Ian D.Williams Jonathan E.Halpert Zheng Zhao Ben Zhong Tang Department of Chemistry the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionDepartment of Chemical and Biomedical EngineeringInstitute for Advanced Studyand Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Shenzhen Institute of Molecular Aggregate Science and Engineering School of Science and EngineeringChinese University of Hong KongShenzhenGuangdong518172China Department of chemistry The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina AIE Institute Guangzhou Development DistrictHuangpuGuangzhou 510530China

Molecular interactions are crucial in diverse fields of protein folding,material science,nanotechnology,and life *** mounting experimental research controls luminescent behavior by adjusting molecular interactions in light-emitting materials,it remains elusive to correlate microscopic molecular interactions with macroscopic luminescent behavior ***,we synthesized three red luminogens with subtle structural variation and investigated the influence of molecular interactions on their luminescent behavior in solution and aggregate *** results indicate that strongπ-πand D-A interactions in both dilute solution(between luminogen and solvent molecules)and aggregate(between luminogens)states cause the redshift in emission,while weak interactions(e.g.,Van der Waals,C–H…π,and C–H…F interactions)enhance the quantum *** work provides a thoughtful investigation into the complicated influence of various molecular interactions on luminescent behavior.

关键词： molecular interactions fluorescence behaviors AIEgens aggregates

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dx2−y2-wave Bose Metal induced by the next-nearest-neighbor hopping t′

arXiv

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arXiv 2024年

Superconductivity arises when electrons form Cooper pairs with phase coherence. In contrast, a lack of phase coherence in Cooper pairs can lead to an uncondensed metallic ground state known as the Bose metal state. In this study, we investigate an attractively interacting fermionic system with nearest-neighbor (NN) hopping (t) and next-nearest-neighbor (NNN) hopping (t′) anisotropy between two species of spins in a two-dimensional (2D) lattice. Utilizing the constrained path quantum Monte Carlo (CPQMC) method, we demonstrate the existence of a dx2−y2-wave Cooper pair Bose metal (CPBM) phase with t′/t > 0.7. The CPBM phase exhibits a dome-like structure in the phase diagram of filling n ∼ 0.65, with the maximal region around an optimal t′/t ∼ 0.2, suggesting that an appropriate value of t′ facilitates the formation of the Bose metal. Furthermore, we find that a Bose metal formed by fermions with a closed Fermi surface confirms that the crucial condition for this exotic phenomenon is primarily the anisotropy of the Fermi surface, rather than its topology. Our finding of the dx2−y2-wave CPBM demonstrates the same pairing symmetry as the pseudogap behavior in cuprates, and its experimental realization in ultracold atom systems is also feasible. © 2024, CC BY.

关键词： Anisotropy

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