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Flat-band based high-temperature ferromagnetic semiconducting state in the graphitic C4N3 monolayer

Fundamental Research 2025年第1期5卷 138-144页

作者： Chaoyu He Yujie Liao Tao Ouyang Huimin Zhang Hongjun Xiang Jianxin Zhong laboratory for Quantum Engineering and Micro-Nano Energy technology and School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China key laboratory of Computational Physical Sciences(ministry of education) Institute of Computational Physical SciencesDepartment of PhysicsFudan UniversityShanghai 200433China

Half-filled isolated flat-band paves a new way to realize high-temperature ferromagnetic semiconductor for spintronics applications,but it is extremely rare in lattice models and lacking in realistic ***,the 2×2 super-cell of the honeycomb lattice with a single-hole defect is proposed as a new lattice model(HL-D-1/8)to realize nontrivial isolated *** further demonstrate that C_(4)N_(3)monolayer of the experimentally realized graphitic carbon nitride(***.,22,1004,2010;***.,9,3366,2018)is a perfect system holding such a lattice to host flat-bands.A new corrugated Pca21 configuration is proposed as the ground state for the free-standing C_(4)N_(3)monolayer,which is dynamically stable and energetically more favorable than the widely-used flat one without dynamical *** Pca21 configuration is found to be an intrinsic ferromagnetic half-semiconductor(T_(c)≈241 K)with one semiconducting spin-channel(1.75 eV)and one insulating spin-channel(3.64 eV),which is quite rare in two-dimensional *** ferromagnetic semiconducting property originates from the isolated pz-state flat-band as the corrugation shifts the flat-band upward to the Fermi ***,such a corrugated Pca21 C_(4)N_(3)monolayer is found to be both piezoelectric and ferroelectric,which makes it an unusual metal-free two-dimensional multiferroic.

关键词： Graphitic C_(4)N_(3) Isolated flat-band Ferromagnetic semiconductor Two-dimensional multiferroic First-principles calculation Tight-binding model

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Rapid and high-resolution 3D printing via photoacid generator induced cationic RAFT polymerization

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Science China Chemistry 2025年

作者： Bowen Zhao Jiajia Li Chongyang Yang Xiangqiang Pan Zhengbiao Zhang Jian Zhu State Local Joint Engineering laboratory for Novel Functional Polymeric materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Soochow University

Vinyl ethers,while being typical monomers for living cationic polymerization,have limited commercial use due to the poor mechanical properties of their polymers at room *** explored the use of photoacid generators to induce cationic reversible addition-fragmentation chain transfer （RAFT） polymerization for the rapid high-resolution three-dimensional （3D）printing of various vinyl *** process demonstrated controlled molecular weights and narrow molecular weight distributions （MWD）,with monomer conversions exceeding 90%in *** a crosslinker enabled 3D printing at speeds up to 8.46 cm h-1with layer thicknesses as thin as 50μ*** mechanical properties of the printed objects were tunable by adjusting resin components,allowing for a range of material characteristics from brittle to elastomeric （tensile strength ranging from 13.9 to 31.7 MPa,Young’s modulus ranging from 185.6 to 992.7 MPa and elongation at break ranging from 2.8%to 68.3%）.Moreover,polymer welding facilitated the creation of gradient materials,showcasing the potential for engineered applications of poly（vinyl ethers）(PVEs).

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Ni nanocomposite films formed by Ni nanowires embedded in Ni matrix using electrodeposition

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Transactions of Nonferrous Metals Society of China 2010年第4期20卷 637-642页

作者：周兆锋潘勇雷维新 Faculty of materials Optoelectronics and PhysicsXiangtan University key laboratory of low dimensional materials and application technology Ministry of Education Xiangtan University

Ni nanocomposite films formed by Ni nanowires embedded in Ni matrix(Ni nanowire/Ni composite films)were fabricated by electrodeposition combined with supersonic stirring in a conventional Watts'bath containing Ni nanowires with diameter about 30 *** deposition temperature-dependent microstructure,crystal orientation,lattice constant and corrosion behavior of the Ni nanowire/Ni composite films were investigated by field emission scanning electron microscope,X-ray diffraction and potentiodynamic polarization tests,*** the possible mechanism was *** is found that to some extent,the deposition temperature has an impact on the microstructure,crystal orientation,lattice constant and corrosion property of the Ni nanowire/Ni composite *** Ni nanowire/Ni composite films prepared at 50℃exhibit a novel inter-twisted-nanowire microstructure and have the best corrosion resistance.

关键词： nickel nanowire composite film electrodeposition corrosion resistance

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Tailoring solvation sheath for rechargeable zinc-ion batteries:Progress and prospect

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materials Reports(Energy) 2025年第1期5卷 3-18页

作者： Xiaomin Cheng Jing Dong Haifeng Yang Xiang Li Xinyu Zhao Bixian Chen Yongzheng Zhang Meinan Liu Jian Wang Hongzhen Lin i-Lab&CAS key laboratory of Nanophotonic materials and Devices Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou215123China State key laboratory of Chemical Engineering East China University of Science and TechnologyShanghai200237China Anhui Provincial key laboratory of Green Carbon Chemistry Fuyang Normal UniversityFuyang236037China State key laboratory of Featured Metal materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China Helmholtz Institute Ulm(HIU) D89081 UlmKarlsruhe Institute of Technology(KIT)D76021 KarlsruheGermany School of materials Science and Engineering Jiangsu UniversityZhenjiang212013JiangsuChina

Aqueous zinc-metal based batteries(AZMBs)perfectly combine safety,economy and pro-environment,but their performance is arresting limited by the interfacial instability caused by the large desolvation energy barrier of[Zn(H2O)6]^(2+)and the massive release of active water at the electrolyte/electrode *** this review,we briefly outline the solvation structure of zinc ions and the necessity of ***,the variety of strategies to solve these issues,mainly including reorganizing solvation sheath by changing electrolyte environment and accelerating interface desolvation by constructing artificial interfacial layer,are categorically discussed and systematically ***,perspectives and suggestions regarding desolvation theories,interfacial evolution,material design and analysis techniques are proposed to design highly stable zinc anodes.

关键词： Aqueous zinc-metal based batteries Desolvation Electrolyte strategy Interfacial layer

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Residual stress in the cylindrical drawing cup of SUS304 stainless steel evaluated by split-ring test

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Acta Mechanica Sinica 2016年第1期32卷 125-134页

作者： Liang-Hong Xiao Dao-He Yuan Jun-Zhong Xiang Jin-Gang Liu Yi-Chun Zhou School of Mechanical Engineering Xiangtan University key laboratory of low dimensional materials & application technology Xiangtan University Ministry of Education

The residual stresses in the wall of a SUS304 stainless steel cylindrical drawing cup were evaluated by split-ring tests, and the influences of stamping die parame- ters on the residual stress were investigated. A new theoretical model of a split-ring test was developed to evaluate the resid- ual stress in a ring, which was verified to be reasonable and reliable by numerical simulations with ABAQUS code and by nanoindentation tests. Seven groups of split-ring tests were completed, and the residual stresses were calculated according to the theoretical model. The split-ring test results showed that the circumferential residual stress in the wall of the SUS304 stainless steel cylindrical drawing cup was very large and did not change with the different die comer radius. The circumferential residual stress first increased with the increase of drawing punch-die clearance, then was almost unchanged when the clearance increased greater than blank thickness 1 mm. Thus, a smaller clearance was suggested to be chosen to reduce the residual stress in the wall of the SUS304 stainless steel drawing cup.

关键词： Residual stress Split-ring test FEM numericalsimulation SUS304 stainless steel Nanoindentation

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Forming limits of nickel coating on right region

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中国有色金属学会会刊：英文版 2007年第5期17卷 913-918页

作者：周里群李玉平周益春 School of Mechanical Engineering Xiangtan University key laboratory of low dimensional materials and application technology of ministry of education Xiangtan University

The forming limits of nickel coating on the right region were studied, so as to direct the preparation of the material and help the production of workpieces. The electrodeposited nickel coating was prepared on steel substrate to form advanced structures, and its plastic instability was investigated by the Swift Plastic Instability Theory. By using the compound law for laminated sheet metals, explicit equations for the calculation of the instable eigen values were deduced. The forming limit diagrams of the nickel coating on the right region were plotted. It is exhibited that the forming limit of the coating sheet is between the forming limits of the individual nickel coating and steel substrate. The forming limit of the nickel coating is not so good as that of the steel substrate, and the forming limit strain of the coating sheet tends to diminish with the increase of thickness of the coating. The greater the normal anisotropic coefficient of the materials is, the better the forming limit is.

关键词：镍覆盖层不稳定性金属成形薄金属

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Preparation and performance of highly conductive polypyrrole-modified basalt fiber

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2025年第2期42卷 723-736页

作者： Zeng, Siheng Wang, Xin Wu, Zhishen Hua, Luqing key laboratory of C & PC Structures ministry of education National and Local Unified Engineering Research Center for Basalt Fiber Production and Application Technology Southeast University Nanjing211189 China

Basalt fibers (BF) possess outstanding mechanical properties, corrosion resistance, and thermal stability, making them widely utilized in various sectors of the national economy. However, due to the insulating nature of basalt fibers, their application in areas such as electromagnetic shielding and electrostatic protection is limited. The investigation introduces a method for preparing conductive basalt fibers, which not only enhances the conductivity of basalt fibers but also improves the tensile strength. It is an efficient, low-cost, and environmentally friendly preparation method. The method utilizes pyrrole monomers (Py), iron chloride oxidant (FeCl3), and the dopant sodium 5-sulfosalicylate (NaSSA) as raw materials. Conductive polypyrrole (PPy) is deposited on the surface of basalt fibers through in-situ polymerization. Different concentrations of Py, FeCl3 and NaSSA are investigated as parameters to study their effects on the conductivity of basalt fibers. Through the in-situ polymerization method, basalt fibers gradually change from brown to black, with a uniform, stable, and thick polypyrrole coating on the surface. The polypyrrole particles exhibit a high doping level, bipolaron ratio, and conjugated chain length, indicating a well-defined structure. In terms of electrical conductivity, the resistance of polypyrrole-modified basalt fibers decreases to a minimum of 8×10−3 Ω·cm, demonstrating excellent conductivity after modification. In terms of mechanical properties, the tensile strength of the fibers is maximally increased by 20.6%, highlighting the significant advantages of the method in preserving fiber structure and enhancing fiber mechanical performance. It was verified by variability analysis and Weibull distribution modeling. The investigation provides a new opportunity for expanding the application of basalt fibers and achieving functionalized basalt fiber composite materials. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All ri

关键词： Tensile strength

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Difunctional NH_(2)-modified MOF supporting plentiful ion channels and stable LiF-rich SEI construction via organocatalysis for all-solid-state lithium metal batteries

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Journal of materials Science & technology 2023年第5期136卷 140-148页

作者： Xuanyi Zhou Chenghan Li Biao Zhang Fenfen Huang Pan Zhou Xinming Wang Zengsheng Ma key laboratory of low dimensional materials and application technology of ministry of education and School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China

As an essential part of the performance improvement of lithium metal batteries,the acquisition of dense(LiF-rich solid electrolyte interphase(SEI))has always been an urgent problem to be ***,we synthesized Zeolitic Imidazolate Frameworks(ZIFs)modified by two different functional groups(-NH_(2),-CH_(3))and used them as the fillers of polyethylene oxide(PEO)composite solid electrolytes to explore the catalytic effect of groups on LiF generation at the Li/electrolytes *** a LiFePO 4||SPE||Li cell test,the PEO-ZIF-NH_(2)with LiF-rich SEI exhibits enhanced cycling performance,which was 3.8 times longer than that of PEO-ZIF-CH_(3).The formation mechanism of LiF-rich SEI was investigated using first-principles calculation,revealing that ZIFs-NH_(2)makes the C-F bond in TFSI-longer compared with ZIFs-CH_(3),which leads to easier breakage of the C-F bond and promoted the formation of *** simple design idea of using organic catalysis to generate more stable SEI provides a new aspect for preparing high-performance lithium metal batteries.

关键词： LiF-rich SEI Organic catalysis Functional groups Hydrogen bond Difunctional MOF

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Lattice distortion enhanced self-trapped excitons emission in antimony halide crystalline clusters

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Science China materials 2025年第1期68卷 132-140页

作者： Da Liu Jingjing He Yuting Sun Xinyi Liu Yu Peng Qing Li Hua Gui Yang Qiang Niu Shuang Yang Yu Hou key laboratory for Ultrafine materials of ministry of education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China China National Enterprise technology Center Inner Mongolia Erdos Electric Power and Metallurgy Group Company LimitedOrdos 016064China

Zero-dimensional perovskite materials,characterized by broadband emission caused by self-trapped excitons,are promising materials for stimuli-responsive and photo-writeable ***,existing research is focused on the effects of structural phase transitions on photophysical properties,and lacks in-depth understanding of the mechanisms of self-trapped excitons ***,we demonstrate that the dehydration reaction in zero-dimensional antimony halide clusters significantly enhances the self-trapped excitons emission without inducing structural phase transition,resulting in a substantial increase in photoluminescence(PL)quantum yield from 3.5%to 91.4%.In-situ X-ray diffraction and PL techniques were employed to shed light on the relationship between the crystal structure and radiative recombination,demonstrating the introduction of rich lattice distortion during the dehydration ***-dependent PL spectra and transient absorption spectra suggest that the lattice distortion causes the moderate electron-phonon coupling strength and high exciton binding energy,facilitating self-trapped excitons to relax from the non-radiative recombination singlet state to the radiative recombination triplet state,corresponding to the enhanced emission *** a proof of concept,several switchable PL applications have been established in scenarios such as anti-counterfeiting,rewritable luminescent paper,and humidity *** finding elucidates the emission mechanism of self-trapped excitons and provides a novel avenue for designing switchable luminescent materials.

关键词： self-trapped excitons zero-dimensional perovskite antimony halides lattice distortion photoluminescence quantum yield

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Fission and Fusion of Two Bright Solitons in a Growing Bose-Einstein Condensate

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Chinese Physics Letters 2008年第9期25卷 3158-3161页

作者：何章明王登龙张蔚曦王凤姣丁建文 Department of Physics and key laboratory of low dimensional materials and application technology of ministry of education Xiangtan University Xiangtan 411105

We analytically study the interaction characteristics of two bright solitons in a one-dimensional growing Bose- Einstein condensate with time-dependent periodic atomic scattering length. It is shown that the interaction between two bright solitons can generate fission and fusion in the presence of both time-dependent periodic atomic scattering length and the growing case. Furthermore, we propose experimental protocols to realize these interaction phenomena by varying the scattering length via the Feshbach resonance in the future experiment.

关键词： NUCLEAR fission NUCLEAR fusion SOLITONS BOSE-Einstein condensation SCATTERING length (Nuclear physics) RESONANCE

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