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Facile synthesis,high fluorescence and flame retardancy of carbon dots

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Journal of Materials Science & Technology 2022年第9期104卷 163-171页

作者： Chang Liu Hongying Li Rui Cheng Jiazhuang guo guo-xing Li Qing Li Cai-Feng Wang Xiaoning Yang su Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringJiangsu Key Laboratory of Fine Chemicals and Functional Polymer MaterialsNanjing Tech UniversityNanjing 210009China

Facile strategy enabling the fabrication of carbon dots(CDs)with favorable performance useful for various applications is highly ***,we report the fabrication of highly fluorescent carbon dots(CDs)towards sensitive metal ion detection,brightly fluorescent printing pattern,as well as green flame retardants for synthetic polymeric *** are synthesized by solvothermal treatment of polypropylene carbonate(PPC)with ethylenediamine,and the quantum yield of CDs could increase from 30%to 86%by further adding trace of citric *** abundant functional groups on the surface of CDs allow CDs well incorporated into polymers to form CD-loaded polystyrene(PS)microspheres,which are employed to construct fluorescent supraballs via triphase microfluidic technique and used as“inks”for uniform fluorescent ***,the resultant CDs show good flame retardancy for highly flammable polymeric foams and *** CDs surpass previously reported flame-retardant additives,to show excellent combustion resistance that the addition of 20 wt%CDs causes 75%decrease in the peak of heat release rate(P-HRR)for polyurethane(PU)***,a molecular dynamics simulation process for PU/CDs combustion is *** work may spur the preparation and application of highperformance carbon-based nanomaterials.

关键词： Carbon dots Fluorescence Flame retardancy Molecular dynamics simulation

A surface engineering strategy for the stabilization of zinc metal anodes with montmorillonite layers toward long-life rechargeable aqueous zinc ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 94-105页

作者： Wenbo Wang Ruifeng Xu Xu Zhang Peiyu Wang Bao Yang Bingjun Yang Juan Yang Kailimai su Pengjun Ma Yanan Deng Xianfeng Fan Wanjun Chen Key Laboratory for Electronic Materials College of Electrical Engineering Northwest Minzu University Resource Chemistry and Energy Materials Research Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for Materials and Processes School of Engineering University of Edinburgh

Rechargeable aqueous zinc-ion batteries （AZIBs） exhibit appreciable potential in the domain of electrochemical energy ***,there are serious challenges for AZIBs,for instance zinc dendrite growth,hydrogen evolution reaction （HER）,and corrosion side ***,we propose a surface engineering modification strategy for coating the montmorillonite （MMT） layer onto the surface of the Zn anode to tackle these issues,thereby achieving high cycling stability for rechargeable *** results reveal that the MMT layer on the surface of the Zn anode is able to provide ordered zincophilic channels for zinc ions migration,facilitating the reaction kinetics of zinc *** functional theory（DFT） calculations and water contact angle （CA） tests prove that MMT@Zn anode exhibits superior adsorption capacity for Zn2+and better hydrophobicity than the bare Zn anode,thereby achieving excellent cycling ***,the MMT@Zn||MMT@Zn symmetric cell holds the stable cycling over 5600 h at 0.5 mA cm-2and 0.125 m A h cm-2,even exceeding 1800 h long cycling under harsh conditions of 5 m A cm-2and 1.25 m A h *** MMT@Zn||V2O5full cell reaches over 3000 cycles at 2 A g-1with excellent rate ***,this surface engineering modification strategy for enhancing the electrochemical performance of AZIBs represents a promising application.

关键词： Hydrogen evolution reaction

Effect of nucleating agents on the electrical properties of cross-linked polyethylene under tensile stress

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High Voltage 2024年第2期9卷 429-439页

作者： Yunqi xing Jiahao Liu Jingang su Junwei Zha guochang Li Ze guo Xiaozhen Zhao Mengjia Feng State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjinChina Electric Power Research Institute of State Grid Hebei Electric Power supply Co. Ltd.ShijiazhuangChina Beijing Advanced Innovation Center for Materials Genome Engineering School of Chemistry and Biological EngineeringUniversity of Science&Technology BeijingBeijingChina Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoChina

During the operation of high-voltage cables,external stress and residual stress can affect the aggregated structure of insulating materials and lead to significant deterioration in their electrical *** investigate the evolution characteristics of the electrical properties of cross-linked polyethylene(XLPE)under mechanical stress,this paper ex-plains the relationship between the aggregated structure of XLPE and its electrical properties and proposes a method for improving insulation performance under me-chanical *** results show that metallocene polyethylene used as a nucleating agent can promote crystallisation through heterogeneous nucleation and increase Young's modulus by non-uniform nucleation,increasing crystallinity and reducing interplanar spacing,resulting in more complete crystal forms and reduced damage to the aggregated structure during the tensile *** nucleating agent modification,the XLPE crystallisation becomes more uniform,and interfacial adhesion forces *** weakened interface damage process between the amorphous and crystalline regions under tensile stress effectively inhibits the process of molecular chain polarisation turning and reduces trap *** modified XLPE crystal structure shows a tendency towards densification and enhanced molecular chain interactions,which can reduce the damage to the aggregated structure under tensile stress,while the reduced free volume inside the material and the shortened average free path of carriers can weaken the damage of high-energy electrons to molecular chains,thereby inhibiting the process of electrical tree *** results show that nucleating agents have great potential for maintaining the stable operation of XLPE cables under mechanical stress.

关键词： stress electrical damage

A route for the study on mass transfer enhancement by adding particles in liquid phase

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Chinese Journal of Chemical Engineering 2022年第8期35卷 158-165页

作者： xing su Ning Qiao Bao-Chang sun College of Chemical and Material Engineering Quzhou UniversityQuzhou 324000China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

This work presents a route for the study on the absorption performance of gas into liquid under the condition of adding particles in a stirred constant temperature *** evaluated systems,hydrogen–water and hydrogen–methanol,with the addition of activated carbon particles(ACP)were carried out,*** results showed that the addition of ACP into the water can enhance the mass transfer between hydrogen and water,the enhancement factor increases rapidly with the increase of the ACP content,and then tends to be ***,for the hydrogen–methanol system,ACP has little effect on the mass transfer *** addition,a gas–liquid mass transfer model considering the effect of solid particle enhancement was established based on the shuttle effect and two-film *** indicated that the predicted value agreed well with the experimental value in both hydrogen–methanol–ACP and hydrogen–water–ACP systems.

关键词： Mass transfer Hydrogen Water Methanol Activated carbon

Synergistic Interface Layer Optimization and surface Passivation with Fluorocarbon Molecules toward Efficient and Stable Inverted Planar Perovskite Solar Cells

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Research 2021年第1期2021卷 1225-1235页

作者： Long Zhou Jie su Zhenhua Lin xing guo Jing Ma Tao Li Jincheng Zhang Jingjing Chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071China Centre for Spintronics and Quantum System State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anShaanxi 710049China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071China

Large-size organic halide passivation has been considered an efficient approach to enhance the perovskite solar cell(PSC)efficiency and ***,a facile posttreatment strategy was demonstrated,wherein trifluoromethyl-phenethylamine hydrobromide(CF_(3)-PEABr)is firstly used to passivate the perovskite film *** CF_(3)-PEABr surface posttreatment could coordinate with halide dangling bonds that exist at the perovskite crystal ***,the surface treatment with CF_(3)-PEABr could efficiently passivate the defects in the perovskite film and suppress the nonradiative carrier *** a result,a high efficiency of 21.3%is obtained,and an increment of 80 mV in V_(oc)(a large V_(oc)of 1.15 V,with a 0.42 V voltage deficit)occurs,compared to the control *** relieve the hydrophobic nature properties of the-CF_(3)functional group and the dewetting problem of PCBM layer deposition,a surfactant Triton X-100 is used to modify the PCBM ***,the devices with CF_(3)-PEABr posttreatment exhibit better operational,thermal(85℃),and long storage stabilities without any encapsulation.

关键词： surface stability perovskite

Echo simulation of lunar penetrating radar: based on a model of inhomogeneous multilayer lunar regolith structure

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Research in Astronomy and Astrophysics 2014年第12期14卷 1642-1653页

作者： Shun Dai Yan su Yuan Xiao Jian-Qing Feng Shu-guo xing Chun-Yu Ding Key Laboratory of Lunar and Deep Space Exploration National Astronomical ObservatoriesChinese Academy of Sciences University of Chinese Academy of Sciences

Lunar Penetrating Radar （LPR） based on the time domain Ultra-Wideband （UWB） technique onboard China＇s Chang＇e-3 （CE-3） rover, has the goal of inves- tigating the lunar subsurface structure and detecting the depth of lunar regolith. An inhomogeneous multi-layer microwave transfer inverse-model is established. The di- electric constant of the lunar regolith, the velocity of propagation, the reflection, re- fraction and transmission at interfaces, and the resolution are discussed. The model is further used to numerically simulate and analyze temporal variations in the echo obtained from the LPR attached on CE-3＇s rover, to reveal the location and structure of lunar regolith. The thickness of the lunar regolith is calculated by a comparison be- tween the simulated radar B-scan images based on the model and the detected result taken from the CE-3 lunar mission. The potential scientific return from LPR echoes taken from the landing region is also discussed.

关键词： Moon -- techniques: radar astronomy -- methods: numerical

A Robust on-Wafer Large Signal Transistor Characterization Method at mm-Wave Frequency

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Chinese Journal of Electronics 2019年第4期28卷 871-877页

作者： su Jiangtao CAI Jialin ZHENG xing suN Lingling Key Laboratory of RF Circuits and Systems Ministry of Education

Accurate on-wafer large signal characterization of RF transistor is crucial for the optimum design of wireless communication circuits. We report a novel and systematic measurement method for the accurate acquisition of input and output power of on-wafer transistors up to 40 GHz. This method employs external couplers to extract the travelling waves, combined with a novel large signal calibration algorithm to calculate the power at on-wafer probe tip. The accuracy of this method was bench marked versus conventional approaches in a real measurement bench, and further been verified by characterizing the large signal response of a 0.25μm GaN HEMT device. It is concluded that the measurement uncertainty has been greatly decreased with this new method, especially at mm-wave frequencies.

关键词： Calibration Nonlinear measurement RF power amplifier mm-wave band On-wafer test

Resilient performance of self-centering hybrid rocking walls with curved interface under pseudo-static loading

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 65-85页

作者： su xing Yan Shi sun Xianglei Wang Tao School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China PetroChina East China Design Institute Co. Ltd.Qingdao 266000China Qingdao Country Garden Bolin Real Estate Co. Ltd.Qingdao 266100China

Frame and rocking wall(FRW)structures have excellent resilient performance during ***,the concrete at interfacial corners of rocking walls(RWs)is easily crushed due to local extreme compression during the rocking *** innovative RW with a curved interface is proposed to prevent interfacial corners from producing local damage,enhancing its earthquake resilient performance(ERP).The precast wall panel with a curved interface is assembled into an integral self-centering hybrid rocking wall(SCRW)by two post-tensioned unbonded prestressed ***,two ordinary energy dissipation steel rebars and two shear reinforcements are arranged to increase the energy dissipation capacity and lateral *** SCRW specimens and one monolithic reinforced concrete(RC)shear wall(SW)were tested under pseudo-static loading to compare the ERPs of the proposed SCRW and the SW,focusing on studying the effect of the curved interface on the *** key resilient performance of rocking effects,failure modes,and hysteretic properties of the SCRW were *** results show that nonlinear deformations of the SCRW are concentrated along the interface between the SCRW and the foundation,avoiding damage within the *** restoring force provided by the prestressed tendons can effectively realize self-centering capacity with small residual deformation,and the resilient performance of the SCRW is better than that of monolithic *** addition,the curved interface of the SCRW makes the rocking center change and move inward,partially relieving the stress concentration and crush of *** rocking range of the rocking center is about 41.4%of the width of the SCRW.

关键词： self-centering hybrid rocking wall(SCRW) monolithic shear wall(SW) earthquake resilient performance(ERP) curved interface rocking center

A Fast Two-Tone Active Load-Pull Algorithm for Assessing the Non-linearity of RF Devices

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Chinese Journal of Electronics 2022年第1期31卷 25-32页

作者： su Jiangtao CAI Jialing ZHENG xing suN Lingling Key Laboratory of RF Circuits and Systems Ministry of Education Key Laboratory of Large Scale Integrated Circuits Design Zhejiang Province

Radio frequency(RF) devices used in modern wireless systems must meet increasingly complicated spectral constraints while still operating with high power efficiency. A fast real-time two-tone active loadpull algorithm is proposed to assess the relationship between nonlinear performance with associated device load impedance variations. This algorithm employs real time measurement data to extract two-tone local nonlinear behaviour model, which is further used for the prediction of injected signal value in the active real-time loadpull system, therefore minimizing the number of iterations required for load emulation. The proposed method was validated on a real two-tone load-pull measurement bench using off-the-shelf instruments. The result shows that the measurement speed has been greatly increased without sacrifice of the impedance emulation *** intelligent two-tone load-pull algorithm is expected to be applied in the designing of modern communication system and radar transmitters, as well as the validation of the models of radio frequency transistors.

关键词： measurement speed real-time load-pull system spectral constraints radio frequency transistors real time measurement data intelligent two-tone load-pull algorithm two-tone local nonlinear behaviour model radio frequency devices impedance emulation accuracy modern communication system modern wireless systems nonlinearity radiocommunication RF devices associated device load impedance variations radar transmitters injected signal value two-tone load-pull measurement bench load emulation high power efficiency fast real-time two-tone active load-pull algorithm nonlinear performance