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Synthesis and properties of a star-shaped organic material with triphenylamine and N-vinyl carbazole units

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Chinese Chemical Letters 2007年第8期18卷 920-922页

作者： Qing Guo He jian gong cheng Feng Lian Bai Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Key Laboratory of Organic Solids Centre for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

A starburst tripbenylamine cored N-vinyl carbazole （V-Cz） branched compound was designed and synthesized via optimized Heck reaction in a yield of 40-60%. Moderate yield came from decomposition of V-Cz and self-coupling of triiodo-triphenylamine. TCz-TPA adopts a highly twisted propeller conformation by molecular mechanical optimization. It is readily soluble for its highly twisted conformation. Transparent and pinhole free films could be easily fabricated by spin-coating for its starburst structure. It emits blue-greenish light in CH2Cl2 peaked at 460 nm with a narrow full-width at half-maximum （FWHM） of 65 nm. As compared,

关键词： Starburst Triphenylamine Carbazole Heck reaction Photoluminescence

A novel chemosensor-bipyridyl end capped hyperbranched conjugated polymer

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Chinese Chemical Letters 2011年第6期22卷 725-728页

作者： Xin Meng Qing Guo He Hui Min Cao jian gong cheng State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

A novel hyperbranched conjugated chemosensor with bipyridyl groups as periphery groups（BPY-HPV） was ***-HPV was highly sensitive to metal ions（Cu^（2＋）,Ni^（2＋）） for the strong coordination interaction（K_（sv） at the order of 10~7 mol^（-1） L） monitored by fluorescence ***,by hydrogen bonds and charge transfer interaction,BPY-HPV shows strong interaction with 1,1,2,2-tetrachloroethane whatever in CH_2Cl_2（K_（sv）～10~6 mol^（-1） L） or film.

关键词： Hyperbranched conjugated polymer Hydrogen bonding Fluorescence Tetrachloroethane

Synthesis and properties of a luminescent organic material with triphenylamine and pentiptycene units

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Chinese Chemical Letters 2007年第7期18卷 820-822页

作者： Qing Guo He Xi Peng Guo jian gong cheng Feng Lian Bai Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

A donor-bridge-donor compound for blue light-emitting with triphenylamine as donor and pentiptycene derivative units as bridge was synthesized via Sonogashira reaction. The chemical structure was confirmed by NMR and MALDI-TOF MS. It emits blue light peaked at 442 nm with a FWHM of 59 nm in CH2Cl2. Fluorescent quantum efficiency in THF is 82% relative to 9,10-diphenylanthracene. A slight hypsochromic shift was found in its drop-cast film. Cyclic voltammetry revealed that it has high HOMO level corresponding to hole transporting character.

关键词： Triphenamine Pentiptycene Sonogashira reaction Blue light Hole transport

Recent advances in fluorescence sensor for the detection of peroxide explosives

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Chinese Chemical Letters 2016年第8期27卷 1429-1436,1471页

作者： Yu Zhang Yan-Yan Fu De-Feng Zhu Jia-Qiang Xu Qing-Guo He jian-gong cheng State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Department of Chemistry College of SciencesShanghai University

The detection of peroxide explosives（PEs） has attracted considerable attention all over the world in global security owing to their simple preparation,poor chemical stability and easy *** recent years,great efforts have been devoted to developing organic fluorescence sensors for detecting the PEs because of their fast response,high sensitivity and high *** this short review,we firstly discuss the sensing mechanisms for fluorescence based the PEs ***,we reviewed recent progress of PE probes in the nearly 5 years and the design strategies of the material structures to enhance the sensitivity or selectivity,such as conjugated polymers and assembled nanoparticles.

关键词： Fluorescence Sensor Peroxide explosives Vapor Redox reaction

Organic semiconductors-coated polyacrylonitrile(PAN) electrospun nanofibrous mats for highly sensitive chemosensors via evanescent-wave guiding effect

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Chinese Chemical Letters 2013年第7期24卷 643-646页

作者： Kang-Yi Hua Chang-Min Deng Chao He Li-Qi Shi De-Feng Zhu Qing-Guo He jian-gong cheng State key of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Science Graduate School of Chinese Academy of Sciences

We report the first use of organic semiconductors （OSCs）-coated PAN nanofibrous mats as highly responsive fluorescence quenching-based chemosensors for 2,4,6-trinitrotoluene （TNT） and H2O2 detection in vapor phase. Conjugated polymers, poly（triphenylaminealt-biphenylene vinylene）（TPA- PBPV）, and small organic molecules, l-horonic-ester pyrene and 1,6-bisboron-ester pyrene, were coated onto the nanofibers fabricated by electrospinning. By introducing the nanofibers structure, a 9-fold fluorescence intensity enhancement and a 14-fold sensitivity enhancement were achieved, which could be attributed to its high area-to-volume ratio, excellent gas permeability, and more importantly, the evanescent-wave effect occurred once the diameters of the fibers were small enough. Since the organic semiconductors coated onto the nanofibrous mats could be replaced by other functional materials, the nanofibers-enhanced detection strategies could be extended to more general domains including chemical and environmental detection.

关键词： Electrospinning Nanofiber Evanescent wave Sensor Vapor

A pure blue light emitting binaphthyl derivative:Synthesis and properties

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Chinese Chemical Letters 2008年第4期19卷 431-434页

作者： Qing Guo He Zeng Ze Chu Gang Tie Lei An Jun Qin Hong Zhen Lin Feng Lian Bai jian gong cheng Yong Qiu Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Key Laboratory of Organic Solids Centre for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080China Department of Chemistry Tsinghua UniversityBeijing 100084China

A binaphthyl derivative with pyrene on 3 and 3＇ positions was synthesized and characterized via Suzuki coupling reaction. Emission maximum in solution was located at 390 nm with a quantum efficiency of 68% by taking 9,10-diphenyl anthracene as reference,while it is shifted to 450 nm with FWHM of 104 nm resulting from aggregation state in solid *** transition temperature（Tg）and decomposition temperature were measured to be 184 and 447℃,respectively,by DSC and *** its photoluminescence spectrum,electroluminescent spectrum peaked at about 460 nm and shows a FWHM of 69 nm corresponding to a pure blue *** turn-on voltage,luminance and efficiency maximum were 5 V,2953 cd/m^2 and 1.37cd/A with CIE color coordinate of（0.16,0.15）,in the device structure of ITO/NPB（40nm）/PY-BN-PY（15nm）/BPhen（40nm）/Mg：Ag.

关键词： Binaphthyl Pyrene Suzuki reaction Photoluminescence Electroluminescence

Optimizing magnetoelastic properties by machine learning and high-throughput micromagnetic simulation

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Rare Metals 2024年第5期43卷 2251-2262页

作者： jian-Hu gong Zheng-Ming Zhang cheng-Liang Zhang Peng-Qiang Hu Chao Zhou Dun-Hui Wang Sen Yang Division of Microelectronic Materials and Devices Hangzhou Dianzi UniversityHangzhou 310018China School of Physics MOEKey Laboratory forNonequilibrium Synthesis and Modulation of Condensed Matter and State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing210093China

Magnetoelastic couplings in giant magnetostrictive materials(GMMs)attract significant interests due to their extensive applications in the fields of spintronics and energy harvesting *** the role of the selection of materials and the response to external fields is essential for attaining desired functionality of a ***,machine learning(ML)models are conducted to predict saturation magnetostrictions(λ_(s))in RFe_(2)-type(R=rare earth)GMMs with different *** to ML-predicted composition–λsrelations,it is discovered that the values ofλshigher than1100×10^(-6)are almost situated in the composition space surrounded by 0.26≤x≤0.60 and 1.90≤y≤2.00 for the ternary compounds of Tb_(x)Dy_(1-x)Fe_(y).Assisted by ML predictions,the compositions are further narrowed down to the space surrounded by 0.26≤x≤0.32 and 1.92≤y≤1.97 for the excellent piezomagnetic(PM)performance in the Tb_(x)Dy_(1-x)Fe_(y)based PM device through our developed high-throughput(HTP)micromagnetic simulation(MMS)***,high sensitivities up to10.22-13.61 m T·MPa^(-1)are observed in the optimized range within which the available experimental data fall *** work not only provides valuable insights toward understanding the mechanism of magnetoelastic couplings,but also paves the way for designing and optimizing highperformance magnetostrictive materials and PM sensing devices.

关键词： Magnetostriction Piezomagnetic effect Machine learning Micromagnetic simulation

Effect of boundary conditions on shakedown analysis of heterogeneous materials

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 39-68页

作者： Xiuchen gong Yinghao NIE Gengdong cheng Kai LI State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentInternational Research Center for Computational MechanicsDepartment of Engineering MechanicsDalian University of TechnologyDalian 116023Liaoning ProvinceChina

The determination of the ultimate load-bearing capacity of structures made of elastoplastic heterogeneous materials under varying loads is of great importance for engineering analysis and design. Therefore, it is necessary to accurately predict the shakedown domains of these materials. The static shakedown theorem, also known as Melan's theorem, is a fundamental method used to predict the shakedown domains of structures and materials. Within this method, a key aspect lies in the construction and application of an appropriate self-equilibrium stress field(SSF). In the structural shakedown analysis, the SSF is typically constructed by governing equations that satisfy no external force(NEF) boundary conditions. However, we discover that directly applying these governing equations is not suitable for the shakedown analysis of heterogeneous materials. Researchers must consider the requirements imposed by the Hill-Mandel condition for boundary conditions and the physical significance of representative volume elements(RVEs). This paper addresses this issue and demonstrates that the sizes of SSFs vary under different boundary conditions, such as uniform displacement boundary conditions(DBCs), uniform traction boundary conditions(TBCs), and periodic boundary conditions(PBCs). As a result, significant discrepancies arise in the predicted shakedown domain sizes of heterogeneous materials. Built on the demonstrated relationship between SSFs under different boundary conditions, this study explores the conservative relationships among different shakedown domains, and provides proof of the relationship between the elastic limit(EL) factors and the shakedown loading factors under the loading domain of two load vertices. By utilizing numerical examples, we highlight the conservatism present in certain results reported in the existing literature. Among the investigated boundary conditions, the obtained shakedown domain is the most conservative under ***, utilizing PBCs to

关键词： heterogeneous material self-equilibrium stress field(SSF) shakedown analysis effect of boundary conditions