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Effect of surface treatment on the structure and high-rate dischargeability properties of AB_5-type hydrogen storage alloy

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Journal of Rare Earths 2009年第3期27卷 510-513页

作者：张沛龙王秀丽涂江平陈国良 State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Hold Fortune(Beijing) industry Co. Ltd. Department of Materials Science and Engineering Zhejiang University

Surface-treated MmNi3.55Co0.75Mn0.4Al0.3 alloy as negative electrode material of nickel-metal hydride battery was employed to improve the high-rate dischargeability. Surface treatment was realized by dipping and stirring the alloy into a HCl aqueous solution with various concentrations at room temperature. The microstructure of the alloy before and after surface treatment was analyzed by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The electrochemical properties before and after surface treatment were compared, and the alloy treated in 0.025 mol/L HCl solution showed the optimal high-rate dischargeability.

关键词： hydrogen storage alloys surface treatment electrochemical properties high-rate dischargeability rare earths

Sequentially bridged MXene platelets for strong high‐temperature EM‐IR bi‐stealth sheets

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SmartMat 2024年第1期5卷 121-134页

作者： Yushan Yang Kaicong Chen Yipeng Chen Chao Wang Baokang Dang Yingying Li Ming Liu Qingfeng Sun College of Chemistry and Materials Engineering Zhejiang A&F UniversityHangzhouChina Guangxi Fenglin Wood industry Group Co.Ltd NanningChina

Combination of flexible multifunctional stealth technology properties such as electromagnetic(EM)and infrared(IR)stealth is crucial to the development of aerospace,military,and electronic fields,but the synthesis technology still has a significant ***,we have successfully designed and synthesized highly flexible MXene@cellulose lamellae/borate ion(MXCB)sheets with strong high‐temperature EM‐IR bi‐stealth through sequential bridging of hydrogen and covalent *** resultant MXCB sheets display high conductivity and good mechanical features such as flexibility,stretchability,fatigue resistance,and ultrasonic *** sheets have a high tensile strength of 795 ***,MXCB sheets with different thicknesses indicate exceptional high‐temperature thermal‐camouflage *** reduces the radiation temperature of the target object(>300°C)to 100°*** conductivity of MXCB sheet with 3μm thickness is 6108 S/cm and the EM interference(EMI)shielding value is 39.74 *** normalized surface‐specific EMI SE absolute shielding effectiveness(SSE/t)is as high as 39312.78 dB·cm2/g,which remained 99.39%even after 10,000 times repeated *** multifunctional ultrathin MXCB sheets can be arranged by vacuum‐assisted induction to develop EM‐IR bi‐stealth sheet.

关键词： cellulose lamellae EM‐IR bi‐stealth mechanically strong MXene platelets transition metal carbides

Structure and Luminescent Properties of the First Cadmium Complex with Isophthalate and Di-pyrazole Ligands

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Chinese Journal of Structural Chemistry 2011年第4期30卷 508-513页

作者：刘同飞张明熹张卫国崔广华 College of Chemical Engineering and Biotechnology Hebei Polytechnic UniversityTangshan College of Light industry Hebei Polytechnic UniversityTangshan Department of Chemistry Hebei Normal University of Science and TechnologyQinhuangdao

The title complex [Cd（IPA）L（H2O）]n（1,H2IPA = isophthalic acid,L = 1,4-bis（pyra-zole-1-ylmethyl）benzene） has been hydrothermally synthesized,and characterized by elemental analyses,IR spectroscopy,TGA and X-ray single-crystal *** crystallizes in the triclinic system,space group P1 with a = 9.3060（6）,b = 10.2374（7）,c = 11.9706（8）？,α = 73.804（6）,β = 77.883（5）,γ = 85.942（5）°,V = 1070.7（1）？3,Z = 2,C22H20CdN4O5,Mr = 532.82,Dc = 1.653 g/cm3,μ = 1.062 mm-1,λ（MoKα） = 0.71073 ？,F（000） = 536,R = 0.0392 and wR = 0.0640 for 3751 observed reflections with I 2σ（I）.Crystal structure analysis showed that complex 1 has a 1D double chain structure,which is assembled together through strong O-H...O hydrogen bonding interactions between coordinated water molecules and carboxylate groups of isophthalate to form a 2D supramolecular *** addition,the solid-state fluorescent spectrum of 1 exhibits strong emission at 364 nm.

关键词： 1D double chain Cd(II) complex di-pyrazole ligand isophthalate luminescent property

Opposed multi-burner gasification technology:Recent process of fundamental research and industrial application

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Chinese Journal of Chemical Engineering 2021年第7期34卷 124-142页

作者： Fuchen Wang Guangsuo Yu Haifeng Liu Weifeng Li Qinghua Guo Jianliang Xu Yan Gong Hui Zhao Haifeng Lu Zhongjie Shen Institute of Clean Coal Technology East China University of Science and TechnologyNational Engineering Research Center of CWS Gasification and Coal Chemical Industry(Shanghai)East China University of Science and TechnologyShanghai 200237China

Opposed multi-burner(OMB)gasification technology is the first large-scale gasification technology developed in China with completely independent intellectual property *** has been widely used around the world,involving synthetic ammonia,methanol,ethylene glycol,coal liquefaction,hydrogen production and other *** paper summarizes the research and development process of OMB gasification technology from the perspective of the cold model experiment and process simulation,pilotscale study and industrial *** latest progress of fundamental research in nozzle atomization and dispersion,mixing enhancement of impinging flow,multiscale reaction of different carbonaceous feedstocks,spectral characteristic of impinging flame and particle characteristics inside gasifier,and comprehensive gasification model are *** latest industrial application progress of ultralarge-scale OMB gasifier and radiant syngas cooler(RSC)combined with quenching chamber OMB gasifier are introduced,and the prospects for the future technical development are proposed as well.

关键词： Opposed multi-burner Gasification Multiscale Numerical simulation Industrial application

Solubilization of small molecules from coal and the resulting effects on the pore structure distribution

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Mining Science and Technology 2009年第6期19卷 761-768页

作者： QIN Zhi-hong JIANG Chun HOU Cui-li LI Xing-shun ZHANG Li-ying CHEN Juan JIANG Bin School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China Lu＇an Mining industry Group Changzhi Shanxi 046204 China

The solubilization of small molecules from coal by solvent extraction and the resulting effects on the pore distribution of a low rank coal were studied. Samples were extracted, in succession, with petroleum ether and with CS2. Extract and residue fractions collected during the solubilization process were analyzed by FTIR and by surface area and porosimetry. The results show that an obvious inflection point exists that allows separating the dissolution sequence into stages. Small molecules are first extracted from the free state, then molecules trapped in micropores are extracted and, finally, molecules trapped in the coal-matrix network are extracted. This is indicated from the extraction yield curves. Chain-like carbonyl compounds, -OH (or -NH) containing compounds that are hydrogen bonded and phenolics dominate the petroleum ether extracts. Chain-like carbonyl components and ether compounds (aliphatic ethers and aromatic ethers) dominate the CS2 extracts. A solvent dissolution mechanism and the effect of small molecule extraction on the pore structure are put forward. Diffusion, dissolution, pore opening, pore shrinking or even collapsing caused by swelling, creating of new micropores, pore opening and, finally, colloidallization of some micropores occurs. In the later stages of the extraction the internal structure of the coal is colloidallized due to swelling and the pore number or volume is greatly reduced.

关键词： coal fractional extraction FTIR distribution of pores

Syntheses,Structures and Luminescent Property of Two Supramolecular Complexes Containing N-P-Acetamidobenzenesulfonyl-glycine Acid Ligand

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Chinese Journal of Structural Chemistry 2009年第12期28卷 1645-1651页

作者：王新德王永伟尹卫平王利亚马录芳 Liming Research Institute of Chemical industry China Haohua (Grop) Co. Department of Chemistry Henan University of Science and Technology College of Chemistry and Chemical Engineering Luoyang Normal University

Making use of N-P-acetamidobenzenesulfonyl-glycine acid （abbreviated as abglyH2）,two transitional metal complexes [Zn（abglyH）（phen）2]ClO4·H2O （1） and Co（abglyH）2（bipy）2（H2O）2 （2）（phen = 1,10-phenanthroline,bipy = 4,4＇-bipyridine） have been synthesized under mild conditions and characterized by IR,elemental analysis and X-ray diffraction analysis. Complex 1 is a monomeric compound which is further assembled by intermolecular hydrogen bonds and π-π interaction into a 2-D supramolecular network. Complex 2 is also a monomeric compound and further connected by intermolecular hydrogen bonds to form a 2-D supramolecular network. Fluorescent analysis shows that complex 1 has an emissive maximum at 364 nm in the solution state at room temperature.

关键词： N-P-acetamidobenzenesulfonyl-glycine acid supramolecular structure fluorescent property

Optimizing the morphology of all-polymer solar cells for enhanced photovoltaic performance and thermal stability

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Journal of Semiconductors 2023年第5期44卷 34-41页

作者： Kang An Wenkai Zhong Chunguang Zhu Feng Peng Lei Xu Zhiwei Lin Lei Wang Cheng Zhou Lei Ying Ning Li Fei Huang Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Frontiers Science Center for Transformative Molecules Center of Hydrogen Scienceand School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China South China Institute of Collaborative Innovation Dongguan 523808China South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China School of Light industry and Engineering&State Key Laboratory of Pulp&Paper Engineering South China University of TechnologyGuangzhou 510640China

Due to the complicated film formation kinetics, morphology control remains a major challenge for the development of efficient and stable all-polymer solar cells(all-PSCs). To overcome this obstacle, the sequential deposition method is used to fabricate the photoactive layers of all-PSCs comprising a polymer donor PTzBI-oF and a polymer acceptor PS1. The film morphology can be manipulated by incorporating amounts of a dibenzyl ether additive into the PS1 layer. Detailed morphology investigations by grazing incidence wide-angle X-ray scattering and a transmission electron microscope reveal that the combination merits of sequential deposition and DBE additive can render favorable crystalline properties as well as phase separation for PTzBI-oF:PS1 blends. Consequently, the optimized all-PSCs delivered an enhanced power conversion efficiency(PCE) of 15.21%along with improved carrier extraction and suppressed charge recombination. More importantly, the optimized all-PSCs remain over 90% of their initial PCEs under continuous thermal stress at 65 °C for over 500 h. This work validates that control over microstructure morphology via a sequential deposition process is a promising strategy for fabricating highly efficient and stable all-PSCs.

关键词： morphology all-polymer solar cells thermal stability sequential deposition

Formation Mechanism and Stability Study of Konjac Glucomannan Helical Structure

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Chinese Journal of Structural Chemistry 2010年第4期29卷 543-550页

作者：简文杰姚闽娜林慧敏管永光庞杰 Department of Biological Technology Xiamen Ocean Vocational College College of Food Science Fujian Agriculture and Forestry University College of Light industry and Food Science South China University of Technology

The formation mechanism and stability of konjac glucomannan （KGM） helical structure were investigated by molecular dynamic simulation and experimental method. The results indicate that the molecular conformation of KGM is a non-typical helical structure. In detail, helical structure of KGM is mainly sustained by acetyl group, whose size and stability are affected by the molecular polymerization degree of KGM. In vacuum among the non-bonding interactions, electrostatic force is the greatest factor affecting its helical structure, but in water solution, hydrogen bond affects the helical arrangement greatly. To our interest, temperature exhibits a reversible destroying effect to some extent; the helical structure will disappear completely and present a ruleless clew-like arrangement till 341 K. This work suggests that the method of combining molecular dynamic simulation and experiment tools can be effective in the study of KGM helical structure.

关键词： glucomannan helical structure mechanism molecular dynamic simulation

Novel MgCl2-supported Catalysts Containing Succinate Donors for Propylene Polymerization

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Chinese Journal of Chemical Engineering 2005年第5期13卷 604-607页

作者：姜涛陈伟赵峰刘月祥 Beijing University of Chemical Technology Sinopec Beijing Research Institute of Chemical industry

A novel MgCl2-supported Ziegler-Natta catalyst containing diethyl diisopropylsuccinate donor was prepared and propylene polymerizations with the combination of such catalyst and four external donors were investigated in detail. The catalyst was compared with a commercial one with phthalate as internal donor in terms of catalytic activity, hydrogen sensitivity and stereospecificity in propylene polymerization. The molecular weight,molecular weight distribution and microstructure of the produced polypropylenes were compared also. It was found that the novel catalyst containing succinate internal donor showed higher activity and higher stereospecificity than those with phthalate as internal donor. Consequently, polypropylenes obtained by the succinate-based catalyst showed high molecular weight, high melting temperature, high isotactic index and broad molecular weight distribution than those obtained with the commercial catalyst.

关键词： propylene polymerization Ziegler-Natta catalyst succinate phthalate donor