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Alkynyl-anchored silver nanoclusters in lanthanide metal-organic framework for luminescent thermometer and CO_(2) cycloaddition

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Nano Research 2023年第5期16卷 7452-7458页

作者： Jing-wen Hu Wan-zhen Qiao Jun-Jun Sun Jun Xu Xi-Yan Dong chong Zhang Shuang-Quan Zang College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China College of Chemistry Zhengzhou UniversityZhengzhou 450001China College of Materials Science and Engineering Henan University of TechnologyZhengzhou 450001China

In this study,an alkynyl-modified aromatic dicarboxylic acid bifunctional ligand was selected to construct lanthanide compound{[Eu_(4)(ebdc)_(6)(4,4-bpy)_(0.5)(H_(2)O)_(4.5)]·(C_(2)H_(5)OH)_(1.25)(H_(2)O)}_(n)(Eu-MOF,H_(2)ebdc=5-ethynyl-isophthalic acid,4,4-bpy=4,4-bipyridine,MOF=metal-organic framework),of which the uncoordinated alkynyl group would be used to anchor silver nanoclusters(Ag NCs).The Eu-MOF exhibits double emission peaks,located at 492 and 611 nm,respectively,in which the high-energy blue emission is associated with alkynyl-modified ligand while the low-energy red emission belongs to characteristic emission of Eu3+,indicating that ligands can effectively sensitize Eu3+*** intensity ratio of the dual emission fluorescence peaks of Eu-MOF displays a good linear relationship with temperature,which realizes the detection function in the low temperature region of 75–275 K,the thermal sensitivity reaches 1.5398%·K^(−1).After anchoring the Ag NCs,the high-energy blue emission is significantly quenched,indicating that the Ag NCs are indeed confined into the framework and interact with the alkynyl group,and thus change the overall electronic *** is the first case of anchoring Ag NCs by a luminescent Eu-MOF and studying nanocluster loading by using spectroscopic *** addition,the Ag NCs@Eu-MOF also shows a good catalytic activity for cycloaddition reaction from CO_(2)and *** study not only provides ideas for exploring the changes in optical properties of luminescent MOFs and Ag NCs caused by confinement effect,but also expands their potential applications in various fields.

关键词： silver nanoclusters confinement effect lanthanide metal-organic framework(MOF) ratiometric fluorescence thermometer CO_(2)cycloaddition

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RNA nanostructure transformation into DNA ones

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Nano Research 2022年第10期15卷 9199-9203页

作者： Jiazhen Lyu Shiyu Ma chong Zhang zhen Huang Key Laboratory of Bio-resource and Eco-environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu 610065China The State Key Laboratory of Biotherapy West China HospitalSichuan UniversityChengdu 610041China SeNA Research Institute Chengdu 610000China

RNAs and their assemblies can form diverse nano-structures and nano-shapes,offering various biological ***,by simply mimicking RNA sequences,DNAs cannot normally form the corresponding nanostructures,which makes the natureinspired transformations and designs *** understand the possible designs and connections between related RNA and DNA nano-shapes,herein we have reported several DNA squares transformed and derived from an RNA assembled square,by gradually replacing RNA with DNA *** have found that there were key RNA nucleotides:Their presences maintained the square,while their absences disrupted ***,we have revealed that as long as the conditions of higher ionic strengths or longer duplexes were included,the square RNA assembly could be completely replaced with DNA nucleotides,still offering the stable DNA *** experimental results have demonstrated that similar RNA nanostructure can be easily transformed into DNA ones via designing and increasing ionic strengths or duplex lengths.

关键词： RNA nanostructure DNA square assembly molecular transformation ionic strength duplex length

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A robust solid electrolyte interphase enabled by solvate ionic liquid for high-performance sulfide-based all-solid-state lithium metal batteries

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Nano Research 2023年第6期16卷 8411-8416页

作者： Jingguang Yi chong Yan Dan Zhou Li-zhen Fan Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China School of electrical engineering and automation Luoyang Institute of Science and TechnologyLuoyang 471023China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan 030032China

All-solid-state lithium metal batteries(ASSLMBs)that incorporate solid electrolyte(SE)and lithium metal anode suggest considerable potential in addressing the security concerns and energy density limitation of conventional lithium-ion batteries(LIBs).However,the practical application of ASSLMBs is always restricted by the interfacial instability of lithium metal anode/electrolyte and inevitable lithium dendrites propagation in ***,a solvate ionic liquid is adopted to modify the interface stability of lithium metal anode/electrolyte and inhibit the growth of lithium dendrites via an in-situ formation of a robust solid electrolyte interphase(SEI)on the surface of lithium metal ***,the ASSLMBs assembled with Li_(6)PS_(5)Cl(LPSCl)electrolyte,lithium metal anode that protected by robust SEI layer,and LiNbO_(3)@NCM622 cathode exhibit high initial capacity of 126.5 mAh·g^(−1)and improved cycling stability with a capacity retention of 80.3%over 60 cycles at 0.1 *** work helps to provide a facile route for the design of robust SEI in the application of ASSLMBs.

关键词： all-solid-state lithium metal batteries solvate ionic liquid robust solid electrolyte interphase Li_(6)PS_(5)Cl(LPSCl)electrolyte

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Microstructures and grain refinement performance of Al-Ti-B-C grain refiner via powder metallurgy

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Rare Metals 2022年第7期41卷 2357-2362页

作者： Cong Xu wen-Long Xiao Shi-zhen wen Yue-Jun zhen Chao-Li Ma Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Material Science and EngineeringBeihang UniversityBeijing 100191China Lizhong Group Baoding Lizhong Wheel Manufacturing Co.Ltd.Baoding 071000China

The Al-5Ti-0.5B-0.5C grain refiner was pre-pared by powder metallurgy(PM).Microstructures of the grain refiner and its grain refinement performance in commercially pure aluminum(Al)were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),and differential scanning calorimetry(DSC).It is found that the average grain size of commercially pure Al can be reduced from~15,000 to~180μm by the addition of Al-5Ti-0.5B-0.5C grain refiner prepared by PM,based on 0.01 wt%Ti *** grain refinement efficiency begins to decrease slightly when the grain refiner is kept in the melt for 60 *** grain refinement is attributed to high stability,proper size,and high density of Al3Ti,TiB2,and TiC particles.

关键词： Al–Ti–B–C Powder metallurgy Microstructure Grain refinement

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Simulation and verification of core–shell MC carbide design in Fe–C–Ni–V–Ti steel

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Journal of Iron and Steel Research International 2021年第1期28卷 58-65页

作者： Chen‑chong Wang Chun‑guang Shen zhen Zhang Wei Xu State Key Laboratory of Rolling and Automation School of Materials Science and EngineeringNortheastern UniversityShenyang 110819LiaoningChina

Thermodynamic theory was used to calculate the formation temperature and site fraction of MC carbides in Fe–C–Ni–V–Ti *** calculation results showed the theoretical formation conditions of core–shell MC ***-step and two-step heat treatment processes were used in Fe–C–Ni–V–Ti alloy to,respectively,obtain homogeneous and core–shell MC carbides,which was consistent with the thermodynamic calculation *** transmission electron microscopy observations showed that the core–shell MC carbide obtained by the two-step heat treatment process contained homogeneous(Ti,V)C as the core and basically VC as the *** mechanical test results proved that compared with homogeneous MC carbides,core–shell MC carbides could improve the basic mechanical properties of the alloy because VC shell greatly increased the bonding strength and separation work of Fe/MC ***,the core–shell MC carbide with a VC shell structure can be a better grain refiner and can be used in steels with a high standard of fracture toughness.

关键词： Core–shell carbide Thermodynamic calculation Microstructure observation Grain refiner Mechanical

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A Novel CMOS Device Capable of Measuring Near-Field Thermal Radiation

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Chinese Physics Letters 2012年第3期29卷 255-258页

作者： FENG chong TANG zhen-An YU Jun School of Electronic Science and Technology Dalian University of TechnologyDalian 116023

We report on the design,fabrication,and characterization of a micro plane-plane geometry CMOS device,which has a heat emitter and a heat receiver,capable of studying the near-field radiative heat transfer at a 550nm *** high vacuum conditions,the heat emitter is heated by supplying driving currents and heated again after removing the heat *** heating power difference between the two kinds of heating experiments indicates the existence of a proximity effect in the heat transfer between the emitter and the *** experiments pave the way towards overcoming the construction difficulty of plane-plane geometry with a nanometer gap.

关键词： emitter receiver heated

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Simutaneous radar imaging and velocity measuring with step frequency waveforms

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Journal of Systems Engineering and Electronics 2009年第4期20卷 741-747页

作者： Yuan Haotian wen Shuliang Cheng zhen Beijing Inst. of Radio Measurement Beijing 100854 P. R. China

The principle and method of both radar target imaging and velocity measurement simultaneously based on step frequency waveforms is presented. Velocity compensation is necessary in order to obtain the good High resolution range profile since this waveform is greatly sensitive to the Doppler shift. The velocity measurement performance of the four styles is analyzed with two pulse trains consisted of positive and negative step frequency waveforms. The velocity of targets can be estimated first coarsely by using the pulse trains with positive-positive step frequency combination, and then fine by positive-negative combination. Simulation results indicate that the method can accomplish the accurate estimation of the velocity with efficient computation and good anti-noise performance and obtain the good HRRP simultaneously.

关键词： high resolution radar step frequency waveform velocity measuring high resolution range profile.

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THE EXISTENCE AND ASYMPTOTIC BEHAVIOR OF PERIODIC SOLUTIONS TO A QUASILINEAR PARABOLIC SYSTEM

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International Journal of Biomathematics 2013年第2期6卷 191-203页

作者： wen-zhen GAN School of Mathematics and PhysicsJiangsu Teachers University of TechnologyChangzhou Jiangsu 213001 P. R. China

In this paper, we investigate the existence, stability and global attractivity of T-periodic solutions for a class of quasilinear parabolic equations under Robin boundary conditions. We obtain that periodic solutions exist if the inter-specific competition rates are weak. The numerical simulations are also presented to illustrate our result.

关键词： Competitor-competitor-mutualist model quasilinear T-periodic solution asymptotic behavior.

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Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期7卷 71-79页

作者： Ruo-Hang Xu Hao-Yu Jiang Dan-Dan Cui Kun-Rong Du Hong-Run Zhang Sheng-Jie Xu Ya-Qi Li Zhi-zhen Ren Liang Wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts

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Insufficient MIRO1 contributes to declined oocyte quality during reproductive aging

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Science China Life Sciences 2025年

作者： zhen-Nan Pan Hao-Lin Zhang Kun-Huan Zhang Jia-Qian Ju Jing-Cai Liu Shao-Chen Sun College of Animal Science and Technology Nanjing Agricultural University Reproductive Medicine Centre The Affiliated Yantai Yuhuangding Hospital of Qingdao University

Mitochondrial Rho-GTPase 1 (MIRO1) is an outer mitochondrial membrane protein which regulates mitochondrial transport and mitophagy in mitosis. In present study, we reported the crucial roles of MIRO1 in mammalian oocyte meiosis and its potential relationship with aging. We found that MIRO1 expressed in mouse and porcine oocytes, and its expression decreased in aged mice. MIRO1 deficiency caused the failure of meiotic resumption and polar body extrusion in both mouse and porcine oocytes, which could be rescued by exogenous MIRO1supplementation. Mass spectrometry data indicated that MIRO1 associated with several cytoskeleton and cell cycle-related proteins, and MIRO1 regulated motor protein Dynein for microtubule-organizing centers (MTOCs) dynamics at germinal vesicle (GV) stage, which determined meiotic resumption. Furthermore, we found that MIRO1 regulated Aurora A and kinesin family member 11 (KIF11) for meiotic spindle assembly in oocytes. Besides, MIRO1 associated with several mitochondria-related proteins dynamic-related protein 1 (DRP1),Parkin and lysosomal-associated membrane protein 2 (LAMP2) for mitochondrial dynamics and mitophagy during oocyte meiosis. Taken together, our results suggested that MIRO1 played pivotal roles in meiotic resumption, spindle assembly and mitochondrial function in mouse and porcine oocytes, and its insufficiency might contribute to the oocyte maturation defects during aging.

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