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Prediction of room-temperature half-metallicity in layered halide double perovskites

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npj Computational Materials 2019年第1期5卷 132-139页

作者： jian Xu Changsong Xu jian-bo liu Laurent Bellaiche Hongjun Xiang Bai-Xin liu Bing Huang Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Computational Science Research Center Beijing 100193China Physics Department and Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA Key Laboratory of Computational Physical Sciences(Ministry of Education) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China

Half-metallic ferromagnets(HMFs)that possess intriguing physical properties with completely spin-polarized current are key candidates for high-efficiency spintronic ***,HMFs that could simultaneously have high Curie temperature(Tc),wide half-metallic gap(ΔHM),and large bulk magnetocrystalline anisotropy energy(MAE)are very rare,which significantly restrict their room-temperature(RT)*** this article,through materials screening in layered halide double perovskites(LHDPs).

关键词： metallic perovskite halide

A novel fluorescent detection for PDGF-BB based on dsDNA-templated copper nanoparticles

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Chinese Chemical Letters 2014年第1期25卷 9-14页

作者： Xiao-Hai Yang Shan Sun Pei liu Ke-Min Wang Qing Wang jian-bo liu Jin Huang Lei-Liang He State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityKey Laboratory for Bio-nanotechnology and Molecular Engineering of Hunan Province

A novel method for the detection of PDGF-BB has been developed using double-strand DNA-copper nanoparticles （dsDNA-CuNPs） as fluorescent markers. This assay relies on the premise that the aptamer- based probe undergoes a conformational change upon binding with target protein, and subsequently triggers polymerization reaction to generate dsDNA. Then, the resultant dsDNA can be used as a template for the formation of CuNPs with high fluorescence. Under the optimized conditions, the proposed assay allowed sensitive and selective detection of PDGF-BB with a detection limit of 4 nmol/L. This possibly makes it an attractive platform for the detection of a variety of biomolecules whose aptamers undergo similar conformational change.

关键词： Copper nanoparticles PDGF-BB Polymerization

Sensitive detection of DNA methyltransferase activity based on rolling circle amplification technology

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Chinese Chemical Letters 2014年第7期25卷 1047-1051页

作者： Pei liu Xiao-Hai Yang Qing Wang Jing Huang jian-bo liu Ying Zhu Lei-Liang He Ke-Min Wang State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringKey Laboratory for Bio-nanotechnology and Molecular Engineering of Hunan ProvinceHunan University

This work develops a fluorescence approach for sensitive detection of DNA methyltransferase activity based on endonuclease and rolling circle amplification （RCA） technique. In the presence of DNA adenine methylation （Dam） MTase, the methylation-responsive sequence of hairpin probe is methylated and cleaved by the methylation-sensitive restriction endonuclease Dpn 1. The products cleaved by restriction endonuclease Dpn I then function as a signal primer to initiate RCA reaction by hybridizing with the circular DNA template. Each RCA product containing thousands of repeated sequences might hybridize with a large number of molecular beacons （detection probes）, resulting in an enhanced fluorescence signal. In the absence of Dam MTase, neither methylation/cleavage nor RCA reaction can be initiated and no fluorescence signal is observed. The proposed method exhibits a dynamic range from 0.5 U/mL to 30 U/mL and a detection limit of 0.18 U/mL. This method can be used for the screening of antimicrobial drugs and has a great potential to be further applied in early clinical diagnosis.

关键词： Methyltransferase RCAD am MTase Dpn 1 Fluorescence

Synthesis and bioactivity of novel 3-(1-hydroxyethylidene)-5-substituted-pyrrolidine-2,4-dione derivatives

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Chinese Chemical Letters 2012年第9期23卷 1023-1026页

作者： B ao Feng Han Qing Ming Shi Xian Feng Wang jian bo liu Sheng Qiang Chun Long Yang Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects Ministry of AgricultureNanjing Agricultural UniversityChina Nanjing 210095 jiangsu Key Laboratory of Pesticide Science Nanjing Agricultural UniversityChina Nanfing 210095 College of Life Science Nanjing Agricultural UniversityChina Nanjing 210095

Ten novel 5-substituted derivatives of 3-（1-hydroxyethylidene）pyrrolidine-2,4-dione were synthesized. The compounds were confirmed by IR, 1H NMR, MS and elemental analysis. The bioassay indicated that these compounds showed noticeable herbicidal activities, and compounds 6f and 6j exhibited excellent inhibitory activities against the stalk of Echinochloa crusgalli, with ECso values of 94.4 and 72.7 rag/L, respectively.

关键词： Tenuazonic acid Pyrrolidine-2,4-dione Synthesis Herbicidal activity

A facile approach toward multicolor polymers:Supramolecular self-assembly via host-guest interaction

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Chinese Chemical Letters 2014年第10期25卷 1318-1322页

作者： Xiao-Hai Yang Fang Zhao Lei-Liang He Ke-Min Wang Jin Huang Qing Wang jian-bo liu Meng Yang State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringKey Laboratory for Bio-nanotechnology and Molecular Engineering of Hunan ProvinceHunan University

A one-step and facile strategy toward the construction of multicolor polymers via supramolecular selfassembly was *** polymers were simply prepared by the self-assembly of adamantane-labeled fluorescein,adamantane-labeled rhodamine B and β-cyclodextrin polymers via host-guest interaction between β-cyclodextrin and *** polymers showed several interesting properties：multiple emission signatures by a single wavelength excitation,easy tunability,intense fluorescence,high *** addition,the self-assembly approach implied a facile and flexible strategy for constructing functionalized materials,such as multicolor materials for biological labeling and imaging,and sensing materials for the detection of physiological parameters.

关键词： Multicolor β-Cyclodextrin polymer Self-assembly Host-guest interaction

Stabilized Thermal Equilibrium Transverse Zeeman Laser

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哈尔滨理工大学学报 1992年第4期 26-28页

作者： Zhang jian liu bo Wang jian

When a transverse He-Ne laser is in a thermal equilibrium state bycontrolling heating current and setting up an isolated layer,the lasercavity length is a constant.A single chip microcomputer is used in thissystem to ... 详细信息

关键词： laser frequency stability single chip microcomputer

Optical properties of＇ Au-core Pt-shell nanorods studied using FDTD simulations

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Frontiers of physics 2016年第3期11卷 123-131页

作者： jian-bo liu Lin Long Yu-Shi Zhang Yue-Ping_Wang Feng-Shou liu Wei-Yao Xu Ming-Ji Zong Lei Ma Wen-Qi liu Hui Zhang JiaoYan Jia-Qi Chen Ying-LuJi Xiao—ChunWu College of Opto-electronic Engineering Zaozhuang University Zaozhuang 277100 China Zaozhuang Municipal Center for Disease Control and Prevention Zaozhuang 277100 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoseience and Technology Beijing 100190 China

Au-core/Pt-shell nanorods （Au@Pt NRs） have been prepared by a Au nanorod-mediated growth method, and they exhibit high electromagnetic field enhancements under coupling conditions. boosted by a long-range effect of the high electromagnetic field generated by the Au core, the electromagnetic field enhancement can be controlled by changing the morphology of the nanostruc- tures. In this study, we report the results on the simulations of the electromagnetic field enhancement using a finite difference time domain （FDTD） method, taking the real shapes of the Au@Pt NRs into account. Due to the ＂hot spot＂ effect, the electromagnetic field can be localized between the Pt nanodots. The electromagnetic field enhancement is found to be rather independent of the Pt con- tent, whereas the local roughness and small sharp features might significantly modify the near-field. As the electromagnetic field enhancement can be tuned by the distribution of Pt nanodots over the Au-core, Au@Pt NRs can find potential applications in related areas.

关键词： gold platinum core-shell nanorod FDTD

SPECTRAL STUDY ON A NEW 3d_z^2 TYPE COPPER(Ⅱ)COMPLEX OF PHENOLIC POLYMERIC CROWN ETHER

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Chinese Chemical Letters 1993年第8期4卷 745-748页

作者： jian bo liu Yong LI Jin Liang GUO DEPARTMENT OF CHEMISTRY,TSINGHUA UNIVERSITY,BEIJING,100084

ESR and IR measurements have been carried out for a copper(Ⅱ)complex of phenolic polymeric crown ether,As a result,the triplet ESR spectrum(S=1)of 3d_z2 ground state copper(Ⅱ)ions was first observed for the powder *** indicated that there existed intramolecular spin-spin interaction betweeen 3d_Z2 ground state copper(Ⅱ)and copper(Ⅱ)*** this binuclear triplet cluster,the axial ligntion of one water molecule in a sandwich position to two adjacent copper(Ⅱ) ions was also confirmed by IR spectra,All things considered,a possible structure for the complex was proposed.

关键词： SPECTRAL STUDY ON A NEW 3d_z~2 TYPE COPPER COMPLEX OF PHENOLIC POLYMERIC CROWN ETHER Cu

Atomic simulations of primary irradiation damage in U–Mo–Xe system

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Chinese Physics B 2023年第3期32卷 370-377页

作者：欧阳文泓刘剑波赖文生李家好柳百新 The Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

To shed a light on Xe bubble nucleation in U–Mo fuel from the view of primary irradiation damage,a reported U–Mo–Xe potential under the framework of embedded atom method has been modified within the range of short and intermediate atomic *** modified potential can better describe the interactions between energetic particles,and can accurately reproduce the threshold displacement energy surface calculated by the first-principles ***,molecular dynamics simulations of primary irradiation damage in U–Mo–Xe system have been conducted under different *** raise of Xe concentration brings about a remarkable promotion in residual defect quantity and generates bubbles in more overpressured state,which suggests an acceleration of irradiation damage under the accumulation of the fission ***,the addition of Mo considerably reduces the residual defect count and hinders irradiation-induced Xe diffusion especially at high contents of Xe,corroborating the importance of high Mo content in mitigation of irradiation damage and swelling behavior in U–Mo *** particular,the variation of irradiation damage with respect to contents suggests a necessity of taking into account the influence of local components on defect evolution in mesoscale simulations.

关键词： irradiation damage metallic fuel uranium alloy interatomic potential