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Dissolutive wetting process and interfacial characteristic of molten Sn–17Bi–0.5Cu alloy on copper substrate

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Rare Metals 2013年第6期32卷 537-543页

作者： Bing-Sheng Xu li-Kun Zang Zhang-fu Yuan Yan Wu Zhou Zhou beijing Key Laboratory for Solid Waste Utilization and Management Department of Energy and Resources EngineeringCollege of Engineering Peking University department of chemistry School of Chemistry and Biology EngineeringUniversity of Science and Technology Beijing beijing Key Laboratory for Solid Waste Utilization and Management Department of Energy and Resources Engineering College of Engineering Peking University beijing Key Laboratory for Solid Waste Utilization and Management Department of Energy and Resources Engineering College of Engineering Peking University

The reactive spreading processes of Sn–17Bi–0.5Cu melt alloy on Cu substrate were studied by sessile drop method in the temperature range of 523.673.*** contact angles between the solder and Cu substrate at different times were recorded with high-resolution CCD digital *** smallest contact angle was observed at623.and 673.*** spreading radius does not increase monotonously with the temperature *** can be attributed to the strong dissolution of Cu substrate into the liquid solder,which hinders the solder from *** line area configuration of the Sn–17Bi–0.5Cu/Cu system was discussed by the description of the equilibrium *** calculated results based on experiments of the tension balances along each of the three interfaces show good agreement with theoretical *** compounds at the Sn–17Bi–0.5Cu/Cu interface are identified as Cu6Sn5adjacent to the solder and Cu3.n adjacent to the Cu substrate,*** results are of practical interest for composite lead-free solders’preparations and joining of Sn–17Bi–0.5Cu to Cu substrate.

关键词： Lead-free solder Reactive wetting Sessile drop method Interfaces

Correlating the Interfacial Polar-Phase Structure to the Local chemistry in Ferroelectric Polymer Nanocomposites by Combined Scanning Probe Microscopy

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Nano-Micro Letters 2023年第1期15卷 80-93页

作者： Jiajie liang Shaojie Wang Zhen Luo Jing fu Jun Hu Jinliang He Qi li State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China

Ferroelectric polymer nanocomposites possess exceptional electric properties with respect to the two otherwise uniform phases,which is commonly attributed to the critical role of the matrix-particle interfacial ***,the structure-property correlation of the interface remains unestablished,and thus,the design of ferroelectric polymer nanocompos-ite has largely relied on the trial-and-error ***,a strategy that combines multi-mode scanning probe microscopy-based electrical charac-terization and nano-infrared spectroscopy is developed to unveil the local structure-property correlation of the interface in ferroelectric polymer *** results show that the type of surface modifiers decorated on the nanoparticles can significantly influence the local polar-phase content and the piezoelectric effect of the polymer matrix surrounding the *** strongly coupled polar-phase content and piezoelectric effect measured directly in the interfacial region as well as the computed bonding energy suggest that the property enhancement originates from the formation of hydrogen bond between the surface modifiers and the ferroelectric *** is also directly detected that the local domain size of the ferroelectric polymer can impact the energy level and distribution of charge traps in the interfacial region and eventually influence the local dielectric strength.

关键词： Interfaces Ferroelectric polymers Nanocomposites Scanning probe microscopy Nano-infrared spectroscopy

Experimental investigation and thermodynamic assessment of the yttrium-hydrogen binary system

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Progress in Natural Science:Materials International 2018年第3期28卷 332-336页

作者： Kai fu Xiaojing Jiang Yanru Guo Shuan li Jie Zheng Wenhuai Tian Xingguo li department of Materials Physics and chemistry University of Science and Technology Beijing beijing National Laboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking University

A coupled experimental investigation and thermodynamic study of the yttrium-hydrogen(Y-H) binary system were carried out to provide more comprehensive and quantitative insights into the key thermodynamic properties of this system. Y-H system in the full range of H/Y = 0–3.0 was investigated by accurate pressure composition isotherm(PCI) measurement to provide credible phase equilibria information and thermodynamic *** phase boundaries obtained were in agreement with previous experimental data but with improved *** the guide of the crystal structures, all the solid phases were modelled using the three sublattice model. The Y-H phase diagram and thermodynamic parameters were calculated and assessed with the CALPHAD *** obtained results are in very good agreement with our experimental data and the published data reported in literature. The obtained thermodynamic database of Y-H system can be used to predict the hydrogenation behavior and decomposition temperatures of hydrides.

关键词： Rare earth Yttrium Hydrogen Pressure composition isotherm Phase diagram Thermodynamics

Accurate design of spatially separated double active site in Bi_(4)NbO_(8)Cl single crystal to promote Z-Scheme photocatalytic overall water splitting

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Journal of Energy chemistry 2023年第12期87卷 568-582,I0014页

作者： Kailong Gao Hongxia Guo Yanan Hu Hongbin He Mowen li Xiaoming Gao Feng fu Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Yanneng-Yanda Comprehensive Energy Industry Technology Research Institute Shaanxi Modern Industrial College of Green and Efficient Utilization of Energy ResourcesShaanxi Collaborative Innovation Center of Clean Utilization of Low Rank CoalShaanxi Key Laboratory of Chemical Reaction EngineeringDepartment of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000ShaanxiChina

The efficiency of photocatalytic overall water splitting was mainly limited by the slow reaction kinetics of water *** to design effective surface active site to overcome the slow water oxidation reaction was a major ***,we propose a strategy to accelerate surface water oxidation through the fabrication spatially separated double active ***/Bi_(4)NbO_(8)Cl-OVs photocatalyst with spatially separated double active site was prepared by hydrogen reduction photoanode deposition *** to the high matching of the spatial loading positions of FeCoPi and OVs with the photogenerated charge distribution of Bi_(4)NbO_(8)Cl and corresponding reaction mechanisms of substrate,the FeCoPi and OVs on the(001)and(010)crystal planes of Bi_(4)NbO_(8)Cl photocatalyst provided surface active site for water oxidation reaction and electron shuttle reaction(Fe^(3.)/Fe^(2+)),*** visible light irradiation,the evolution O_(2)rate of FeCoPi/Bi_(4)NbO_(8)Cl OVs was 16.8μmol h^(-1),as 3..9 times as Bi_(4)NbO_(8)***,a hydrogen evolution co-catalyst PtRu@Cr_(2)O_(3.was prepared by sequential photodeposition *** to the introduction of Ru,the Schottky barrier between PbTiO_(3.and Pt was effectively reduced,which promoted the transfer of photogenerated electrons to PtRu@Cr_(2)O_(3.thermodynamically,the evolution H_(2)rate on PtRu@Cr_(2)O_(3./PbTiO_(3.increased to 664.8 *** based of the synchronous enhancement of the water oxidation performance on FeCoPi/Bi_(4)NbO_(8)Cl-OVs and water reduction performance on PtRu@Cr_(2)O_(3./PbTiO_(3.,a novel Z-Scheme photocatalytic overall water splitting system(FeCoPi/Bi_(4)NbO_(8)Cl-OVs)mediated by Fe^(3.)/Fe^(2+)had successfully *** visible light irradiation,the evolution rates of H_(2)and O_(2)were 2.5 and 1.3.mol h^(-1),*** work can provide some reference for the design of active site and the controllable synthesis of OVs spatial *** the other hand,the hydr

关键词： Spatially separated double active sites FeCoPi/Bi_(4)NbO_(8)Cl-OVs Photocatalytic water oxidation Photocatalytic hydrogen evolution Hydrogen evolution co-catalyst PtRu@Cr_(2)O_(3. Z-Scheme photocatalytic overall water splitting system

Design a thieno[3.2-b]thiophene bridged nonfullerene acceptor to increase open-circuit voltage,short-circuit current-density and fill factor via the ternary strategy

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Chinese Chemical Letters 2020年第5期31卷 1243-1247页

作者： Xiaofang li Kun li Dan Su fugang Shen Shuying Huo Hongbing fu Chuanlang Zhan College of chemistry and Environmental Science Hebei UniversityBaoding 071002China CAS key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China department of chemistry Capital Normal UniversityBeijing 100048China

In this study,we report a new small molecule acceptor(named TT-4 F)which uses 3.6-dimethoxylthieno[3.2-b]thiophene(TT)as theπ-*** of 0.05 weight ratio amount of TT-4 F into the host binary blend of PTB7-Th:IEICO-4 F,resulting in a ternary blend in a weight ratio of 1:1:0.05,enables increased open-circuit voltage(Voc),short-circuit curre nt-density(Jsc),and fill-factor(FF)at the same ***,12.1%efficiency is *** to the 3.(2-ethylhexyloxylthiophene)bridge on IEICO-4 F,the additional methoxyl group on the TT-6 position is involved in the lowest unoccupied molecular orbital(LUMO)and the largerπ-system on TT increases the electron-donating nature,both of which help to raise the LUMO level,one reason of the increased *** addition of 0.05 TT-4 F,the hole mobility is increased,the monomolecular recombination is reduced,and the charge dissociation and collection is *** of these contribute to the increased Jsc and FF.

关键词： fullerene-free Polymer solar cell Small molecule acceptor Ternary solar cell Organic photovoltaic

Synthesis of New Monoporphyrinate Lanthanide Complexes for Potential Use in Optical limiting

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Synthesis of New Monoporphyrinate Lanthanide Complexes for P...

A New Method to Remove Neutral Template in the Synthesis of HMS

中国化学会全国第十三届大环化学暨第五届超分子化学学术讨论会

作者： Shitao fu Guijiang Zhou Xunjin Zhu Cheng Ye Wai-Kwok Wong and Zaoying li ( College of chemistry and Molecular Sciences, Wuhan University, Wuhan 43.072 {3. of chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong, Center for Molecular Science, Institute of chemistry, Chinese Academy of Sciences, beijing 100080)

Three monoporphyrinate lanthanide complexes based on 5,10,15,20-tetrakis (p-diphenylaminophenyl)-21H,23.-porphine (H2TDPAPP) were synthesized, and experimental investigations of the nonlinear optical transmittance characteristics at 53. nm show that they are excellent optical limiters with performance comparable or superior to those of the reverse saturable absorption dyes such as fullerene C60 and metal phthalocyanine complexes.

关键词： monoporphyrinate lanthanide complexes synthesis optical limiters

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Chinese Chemical Letters 2001年第3期12卷 275-278页

作者： Qing Min ZHANG Yan li fu Zhi HUANG Zhen Nan GU department of Materials chemistry Peking UniversityBeijing 100871

In the synthesis of HMS, Soxhlet extraction as a new method to remove neutral template was studied. HREM image, X-ray diffraction patterns and nitrogen adsorption-desorption results verified that this method can not only efficiently remove and recover the template, but also benefit the maintenance of the mesoporous framework structure.

关键词： Soxhlet extraction HMS After-treatment

functional characterization of(E)-β-caryophyllene synthase from lima bean and its up-regulation by spider mites and alamethicin

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Journal of Integrative Agriculture 2017年第10期16卷 2231-2238页

作者： li Feng-qi fu Ning-ning ZHOU Jing-jiang WANG Gui-rong Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry Sciences Institute of Plant Protection Chinese Academy of Agricultural Sciences department of Biological chemistry and Crop Protect Rothamsted Research

（E）-β-Caryophyllene is a sesquiterpene compound widely distributed in plants and functions in plant defence. However, little is known about the sequence and function of （E）-β-caryophyllene synthase in lima bean （Phaseolus lunatus）. Here, we report a new full-length cDNA （PICAHS） encoding （E）-β-caryophyllene synthase, a possible key enzyme of plant defence. The cDNA of PICAHS contains an open reading frame of 1 761 bp, encoding a protein of 586 amino acids with a predicted mass of 67.95 kDa. The deduced amino acid sequence shows 52% identity with sesquiterpene synthase MtCAHS of Med- icago truncatula. Based on phylogenetic analysis, PICAHS is classified as the terpene synthases （TPS）-a subfamily. The recombinant enzyme, expressed in Escherichia coil, catalysed the formation of a major product （E）-β-caryophyllene （82%） and a minor product a-humulene （18%） from farnesyl dJphosphate. Real-time quantitative PCR （qRT-PCR） analysis found that the PICAHS transcript was significantly up-regulated in leaves after treatment with spider mites and alamethicin （ALA）, suggesting its ecological function in plant defence.

关键词： plant defence terpene synthases (E)--caryophyllene lima bean

Efficient light-driven reductive amination of furfural to furfurylamine over ruthenium-cluster catalyst

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Journal of Energy chemistry 2023年第1期76卷 239-248,I0007页

作者： Zhen Xue Shasha Wu Yujing fu Lan Luo Min li Zhenhua li Mingfei Shao lirong Zheng Ming Xu Haohong Duan State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China department of chemistry TsinghuaUniversityBeijing 10084China Institute of High Energy Physics The Chinese Academy of SciencesBeijing 100049China

Selective reductive amination of carbonyl compounds with high activity is very essential for the chemical and pharmaceutical industry,but scarcely successful paradigm was reported via efficient photocatalytic ***,the ultrasmall Ru nanoclusters(~0.9 nm)were successfully fabricated over P25 support with positive charged Ru^(δ+)species at the interface.A new route was developed to achieve the furfural(FAL)to furfurylamine(FAM)by coupling the light-driven reductive amination and hydrogen transfer of ethanol over this type ***,the photocatalytic activity and selectivity are strongly dependent on the particle size and electronic structure of *** Ru^(δ+)species at the interface promote the formation of active imine intermediates;moreover,the Ru nanoclusters facilitate the separation efficiency of electrons and holes as well as accelerate the further hydrogenation of imine intermediates to product primary *** contrast Ru particles in larger nanometer size facilitate the formation of the furfuryl alcohol and excessive hydrogenation *** addition,the coupling byproducts can be effectively inhibited via the construction of *** study offers a new path to produce the primary amines from biomass-derived carbonyl compounds over hybrid semiconductor/metal-clusters photocatalyst via light-driven tandem catalytic process.

关键词： furfural Reductive amination Ru nanoclusters Hydrogen transfer Photocatalysis