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BN-embedded aromatics for optoelectronic applications

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Chinese Chemical Letters 2016年第8期27卷 1139-1146,1465页

作者： Jie-Yu Wang jian pei Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking University

The knowledge of azaborine chemistry is growing as an important branch in organic semiconductor ***,BN-embedded aromatic compounds have attracted great attention due to their fascinating properties resulted from the replacement of CC unit with isoelectronic BN unit in *** great insights have been provided into the synthetic chemistry and photophysical properties of BN-embedded aromatics,their applications in optoelectronic areas are still at a young *** short review summarizes the recent progress of BN-embedded aromatics with optoelectronic applications in organic field-effect transistors,organic light-emitting diodes,organic photovoltaics,stimuli-responsive luminescent devices,and chemical sensors.

关键词： Azaborine Optoelectronic device Organic semiconductor Aromatics

Reduction of 1-3 mm Iron Ore by CO on Fluidized Bed

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Journal of Iron and Steel Research International 2011年第3期18卷 1-5页

作者： PANG jian-ming GUO pei-min ZHAO pei The State Key Laboratory for Advanced Steel Processes and Products Central Iron and Steel Research InstituteBeijing 100081China

The reduction-degree of the sample increases and the utilization ratio of gas decreases when the reaction lasts longer time,which indicates that the reaction is faster at the beginning of reduction,while it becomes slower in subsequent *** higher the reaction temperature,the higher the utilization ratio of gas and the reduction-degree are,but the difference of utilization ratio among the different temperatures becomes smaller with *** utilization ratio of gas can reach about 8% and the reduction-degree is 80% for 20 min reduction at 850 ℃,indicating that the reduction reaction by CO is very fast at high *** higher the reaction temperature,the higher the apparent reaction rate constant is,but the difference of apparent reaction rate constant among the different temperatures becomes *** apparent activation energy is about 59.11 kJ/mol in the fluidized bed *** increase of reduction-degree with gas velocity shows quite good linearity,indicating that at high temperature even higher velocity of reducing gas can be used to improve the productivity of reactor when CO is used as reducing *** the increase of charge height,the metallization ratio and the reduction-degree decrease,but the utilization ratio of gas increases.

关键词： CO fluidized bed fine powder iron ore reduction-degree

Synthesis, crystal structure, and application of an acenaphtho[1,2-k] fluoranthene diimide derivative

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Science China Chemistry 2015年第2期58卷 364-369页

作者： Lin Ding Chiyuan Yang Zhongmin Su jian pei College of Chemistry and Molecular Engineering Peking University College of Chemistry Northeast Normal University

Organic electron acceptor materials play an important role in organic ***,many organic electron acceptors have been developed,in which aromatic fused-imides have proved to be a promising family of excellent electron *** report the first synthesis of a novel aromatic fused-imide,acenaphtho[1,2-k]fluoranthene diimide derivative(AFI),using lithium-halogen exchange and Diels-Alder *** construction of a large conjugated plane and the introduction of electron-withdrawing imide groups endow AFI with a low lowest unoccupied molecular orbital(LUMO)level of 3.80 e *** exhibits a regular molecular arrangement and strong - interactions in the single-crystal structure,which indicates its potential application in organic electronic *** cell devices that were fabricated using AFI as the electron acceptor and P3HT as the electron donor achieved an energy conversion efficiency of 0.33%.

关键词： acenaphtho fluoranthene diimide lithium-halogen exchange Diels-Alder reaction electron acceptor solar cell

One-dimensional(1D) micro/nanostructures of organic semiconductors for field-effect transistors

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Science China Chemistry 2015年第6期58卷 937-946页

作者： Yu-Qing Zheng Jie-Yu Wang jian pei Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education College of Chemistry and Molecular Engineering Peking University

Organic semiconductors have gradually become the super stars on the stage of optoelectronic materials, due to their low cost, flexibility and solution processability. Numerous organic semiconductors, including small molecules and conjugated polymers, have been designed and synthesized to explore the potential of organic materials in optoelectronic industry. One-dimensional micro/nanostructures of organic semiconductors generally have more ordered packing structure with fewer defects compared with thin films, and are thus thought to show intrinsic carrier mobility of organic materials. Moreover, the packing structure in micro/nanostructures is clear and relatively easy to analyze, which makes these micro/nanostructures a good platform to study structure-property relationship. Therefore, design of suitable organic molecules to form micro-/nanostructures and methods to obtain ideal micro/nanostructures for functional devices will be fully discussed in this mini review. Finally, the perspective and opportunity of 1D micro/nanostructured organic materials based OFETs in the near future are also addressed.

关键词： organic semiconductors organic field-effect transistors one-dimensional micro/nanostructures self-assembly

Preparation of Porous Polylactide Microspheres and Their Application in Tissue Engineering

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Chinese Journal of Polymer Science 2018年第6期36卷 712-719页

作者： Xu-Dong Shi pei-jian Sun Zhi-Hua Gan Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China The GAS Key Laboratory of Engineering Plastics Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China State Key Laboratory of Organic-inorganic Composites College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

In this study, porous polylactide（PLA） microspheres with different structures were prepared through the multiple emulsion solvent evaporation method. By changing organic solvents（ethyl acetate and chloroform） and adding effervescent salt NH4 HCO3 in the inner water phase, microspheres with porous capsular, matrix, microcapsular and multivesicular structures were prepared. The protein encapsulation and release, and the cell growth behavior of porous microspheres were further explored. Under the same inner water phase, microspheres prepared with chloroform had higher protein encapsulation efficiency and less protein release rate as compared with those prepared with ethyl acetate. Cell experiments showed that the relatively rough surface of microspheres prepared with chloroform was more favorable for the cell growth in comparison with the smooth surface of microspheres prepared with ethyl acetate. This study shows a simple and effective method to control the protein release and cell growth behaviors of polymer microspheres by tuning their porous structure.

关键词： Polylactide Porous microspheres Drug release Cell Tissue engineering

Non-aqueous Suspension Polycondensation in NMP-Ca Cl_2/Paraffin System―A New Approach for the Preparation of Poly(p-phenylene terephthalamide)

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Chinese Journal of Polymer Science 2015年第4期33卷 564-575页

作者： pei-jian Wang Kai Wang Ji-song Zhang 骆广生 The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua University

A non-aqueous suspension polycondensation method was proposed to proceed the reaction ofp-phenylenediamine and terephthaloyl chloride for the preparation of poly（p-phenylene terephthalamide）（PPTA）. The system was operated with NMP-CaCI2 solution as the dispersed phase and inert liquid paraffin as the continuous phase. Each of NMP-CaCl2 solution microdroplet suspended in paraffin served as a microreactor where the polycondensation took place. According to the results of TGA, XRD, IR, SEM and EA, PPTA with good quality was obtained through this novel method, and a number of main factors influencing this process were investigated to determine the optimum condition for the preparation of PPTA. Besides, this two-phase polycondensation system brings many unique advantages compared to the conventional solution polycondensation method, including a sealed reaction environment keeping the reactants away from oxygen and water, easy removal of HCI to promote the reaction, well-controlled temperature and low viscosity which means less energy cost.

关键词： Poly(p-phenylene terephthalamide) Non-aqueous suspension polycondensation Weight-average molecular weight Microreactor Microdroplets.

Embedding pyridine units in acceptors to construct donor-acceptor conjugated polymers

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Chinese Chemical Letters 2019年第1期30卷 25-30页

作者： Zi-Yuan Wang Jie-Yu Wang jian pei Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University

The development of donor-acceptor(D-A) conjugated polymers greatly promotes the device performance in organic electronics. Recently, the strategy of embedding pyridine units into D-A conjugated polymer backbones has attracted much attention due to the resulted lowered LUMO levels. In addition, the possible non-bonding interactions resulted from the nitrogen atoms also improve the coplanarity of the polymer backbones. All these factors have great contribution to enhance the device performance. In this review, we summarized the recent development of pyridine-embedded D-A conjugated polymers and their applications in organic field-effect transistors(OFETs).

关键词： Donor-acceptor Conjugated polymers Coplanarity Pyridine-embedded Organic electronics

A high-efficiency solid-state dye-sensitized solar cell with P3HT polymer as a hole conductor and an assistant sensitizer

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Particuology 2014年第4期12卷 71-76页

作者： Qisheng Liu Cuncheng Li Kejian jiang Yanlin Song jian pei Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong(University of Jinan) School of Chemistry and Chemical EngineeringUniversity of Jinan Beijing National Laboratory for Molecular Sciences(BNLMS) Key Laboratory of Organic SolidsLaboratory of New MaterialsInstitute of ChemistryChinese Academy of Sciences Beijing National Laboratory for Molecular Sciences(BNLMS) The Key Lab of Bioorganic Chemistry and Molecular Engineering College of ChemistryPeking University

Poly（3-hexylthiophene）（PBHT） was used in a solid-state dye-sensitized solar cell （S-DSC） with a broad- absorption metal-free organic dye sensitizer 1,2,4,5-benzenetetracarboxylic acid （BzTCA）. Under full- sunlight irradiation （AM 1.5 G, 100 mW/cm2 ）, an overall conversion efficiency of 3.21% was achieved, which represents one of the highest efficiencies reported in an S-DSC. Our results indicate that the P3HT polymer is a promising material as both a hole conductor and an assistant sensitizer in the fabrication of solid-state DSCs.

关键词： Solid-state dye-sensitized solar cellPoly(B-hexylthiophene)Conversion efficiency

Confidence interval of intrinsic optimum temperature estimated using thermodynamic SSI model

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Insect Science 2013年第3期20卷 420-428页

作者： Takaya Ikemoto Issei Kurahashi pei-jian Shi Department of Microbiology Teikyo University School of Medicine Department of Planning Information and Management The University of Tokyo Hospital Tokyo Japan State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing China

The intrinsic optimum temperature for the development of ectotherms is one of the most important factors not only for their physiological processes but also for ecolog- ical and evolutional processes. The Sharpe-Schoolfield-Ikemoto （SSI） model succeeded in defining the temperature that can thermodynamically meet the condition that at a par- ticular temperature the probability of an active enzyme reaching its maximum activity is realized. Previously, an algorithm was developed by Ikemoto （Tropical malaria does not mean hot environments. Journal of Medical Entomology, 45, 963-969） to estimate model parameters, but that program was computationally very time consuming. Now, investi- gators can use the SSI model more easily because a full automatic computer program was designed by Shi et al. （A modified program for estimating the parameters of the SSI model. Environmental Entomology, 40, 462-469）. However, the statistical significance of the point estimate of the intrinsic optimum temperature for each ectotherm has not yet been determined. Here, we provided a new method for calculating the confidence interval of the estimated intrinsic optimum temperature by modifying the approximate bootstrap confidence intervals method. For this purpose, it was necessary to develop a new program for a faster estimation of the parameters in the SSI model, which we have also done.

关键词： approximate bootstrap confidence intervals bias-corrected and accelerated bootstrap percentiles development rate temperature