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Electrospinning Janus Nanofibrous Membrane for Unidirectional Liquid Penetration and Its Applications

Chemical Research in Chinese Universities 2021年第3期37卷 337-354页

作者： HOU Lanlan LIU Jingchong LI Dianming GAO Yuan WANG Yaqiong HU Rongjun REN Wen XIE Shuixiang CUI Zhimin WANG Nü State Key Laboratory of Petroleum Pollution Control CNPC Research Institute of Safety and Environmental TechnologyBeijing102206P.R.China Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing100191P.R.China

Janus membrane with opposite wettability on its two sides has witnessed an explosion of interest in the field of liquid spontaneous and directional transport for their promising *** advances in fabrication technology and natural bionics have brought remarkable progress for the development of Janus *** the exciting progress,the micro/nanofabrication technique of electrospinning shows advantages in constructing thin porous fibrous membrane materials with controllable surface wettability and hierarchical ***,a brief review of bioinspired Janus membrane for unidirectional liquid penetration fabricated by electrospinning is presented,and the underlying scientific mechanism is discussed with an emphasis on the materials design involving asymmetric surface wettability and micro-topology *** overview of recent emerging applications is also reviewed,with special attentions to liquid separation,water collection,distillation,and smart textile,*** researchers keep to develop more efficient strategies on designing new Janus membrane with higher performances,it has become increasingly important to understand the mechanism of liquid moving dynamics at the asymmetric interface in order to better recognize the scientific limitations currently hindering the field *** last,the challenges currently faced and possible strategies on developing new Janus membranes for optimization and engineering in the future are proposed.

关键词： Electrospinning Nanofiber Janus membrane Unidirectional penetration Wettability gradient

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Enhanced Cyclic Performance of MgH2/Γ-Mns Composite and Evolution Behavior of the Sulfide

SSRN

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SSRN 2024年

作者： Wu, Chengzhang Lin, Jiayu Luo, Wenwen Wu, Zhanwen Len, Haiyan Sun, Chenghua Li, Qian State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and Engineering Shanghai University Shanghai200444 China Centre for Translational Atomaterials Faculty of Science Engineering and Technology Swinburne University of Technology HawthornVIC3122 Australia National Engineering Research Center for Magnesium Alloys College of Materials Science and Engineering Chongqing University Chongqing400044 China

In the present work, three kinds of γ-MnS with different morphologies were prepared by solvothermal method and employed to improve the hydrogen storage properties of MgH2. It was found that spherical γ-MnS had the best catalytic activity. The influences of γ-MnS content and milling time on the hydrogen storage performance of MgH2 were investigated. The initial hydrogen release of MgH2-5(γMnS)-5h composite started at 241 ℃, 4.61 wt.% of hydrogen was desorbed within 20 min at 270 ℃, and 3.59 wt.% of hydrogen was absorbed within 5 min at 150 ℃. The apparent activation energies of hydrogen absorption and desorption of MgH2-5(γMnS)-5h composite decreased to 45.1 and 63.6 kJ/mol, respectively. In addition, the composite also exhibited good cycle performance, which could keep stable in 60 cycles. The results of SEM and TEM declared that the catalyst was uniformly distributed on the matrix during the cycling process, and the worm-like morphology of the sample also had a positive effect on the stability of kinetics. XPS results displayed that γ-MnS remained stable during ball milling, but the characteristic peaks of Mn and α-MnS were observed in the first and tenth hydrogenated samples, while only the peaks of Mn were observed in the sixtieth hydrogenated sample. The formation of Mn not only greatly weakened the Mg-H bond, but also led to a slight increase in cycle capacity. Therefore, γ-MnS-doped MgH2 manifested a good comprehensive hydrogen storage performance. © 2024, The Authors. All rights reserved.

关键词： Magnesium compounds

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Research on transient interaction mechanism of two PMSG considering different nodes and network characteristics 1

Research on transient interaction mechanism of two PMSG cons...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Mao, Zichen Yuan, Xiaoming State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Compared with the traditional AC power system, high proportion of renewable generation and power electronics are the characteristics of the power electronic dominated power system. The multi-time scale problem of the dynamical problems becomes prominent. There are complex interactions between power electronics. First, this paper describes the multi-time scale control links of equipment in the power electronic dominated power system and the mechanism of the multiscale with the example of permanent magnetic synchronous generator (PMSG).Second, a multi-time scale nesting model for analyzing interaction is proposed. Finally, the phenomenon of multi-time scale interaction between two PMSG is explained by simulation, and the influence of different node and network characteristics on the degree of interaction is explored, which provides references for subsequent analytical analysis. © 2020 IEEE.

关键词： Synchronous generators

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Stability analysis of VSC based on SISO equivalent in current control time scale 1

Stability analysis of VSC based on SISO equivalent in curren...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Peng, Yaxin Yuan, Xiaoming Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

Oscillations in current control (CC) timescale (higher than 50 Hz) caused by voltage source converters (VSCs) integrating into the weak grid have occurred. However, relevant studies lack enough mechanism cognitions of instability of such system. In order to guide the parameter setting of the controllers, this paper first presents a small signal model of VSC based on motion equation concept. Secondly, a SISO equivalent method which can quantitatively analyze the interaction between variables in MIMO is introduced. Thirdly, the influence of phase locked loop (PLL) bandwidth, current controller parameters in the d-axis and q-axis and filter bandwidth on the feedforward branch of terminal voltage on stability is analyzed based the SISO equivalent method, which can help engineers to study the mechanisms of the voltage amplitude/frequency stability. Finally, the simulations in time domain verify the correctness of the analyses. © 2020 IEEE.

关键词： Electric current control

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Synthesis and luminescence properties of apatite-type red-emitting Ba_(2)La_(8)(GeO_(4))_(6)O_(2):Eu^(3+)phosphors

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Journal of Rare Earths 2021年第11期39卷 1320-1326,I0001页

作者： Kun Nie Xiaoxue Ma Panlong Lin Navnita Kumar Luoxin Wang Lefu Mei State Key Laboratory of New Textile Materials&Advanced Processing Technology and Key Laboratory of Textile Fiber and Products(Ministry of Education) School of Materials Science and EngineeringWuhan Textile UniversityWuhan 430200China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChinaUniversity of Geosciences(Beijing)Beijing 100083China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA

A new kind of apatite-type red-emitting Ba_(2)La_(8)(GeO_(4))_(6)O_(2):Eu^(3+)phosphor was prepared by high temperature solid-state *** Rietveld analysis based on the powder diffraction data shows that Ba_(2)La_(8)(GeO_(4))_(6)O_(2):Eu^(3+)phosphors possess a pure apatite phase without any *** emission spectrum of Ba_(2)La_(8)(GeO_(4))_(6)O_(2):Eu^(3+)phosphor consists of two bands,an orange emission band from 500 to 600 nm and a red emission band from 600 to 680 *** varying the amount of the doped europium ions from 0.02 to 0.14 mol,it is found that the luminescent properties of this rare earth phosphor are the best when the concentration of europium ion is 0.08 *** optimum concentration is eventually proved to be 0.08 *** Eu^(3+)doping dependent luminescence quenching can be further ascribed to dipole-quadrupole *** quantum yield of Ba_(2)La_(7.92)(GeO_(4))_(6)O_(2):0.08 Eu^(3+)is 37.23%.The CIE analysis confirms a reddish emission in the near ultraviolet(n-UV)*** these above properties of the phosphor can help in contribution of promoting white light-emitting diode.

关键词： Apatite Calcination Phosphor Optical property Luminescence Rare earths

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Sufficient cathode infiltration for stable 500 Wh kg−1 level lithium–sulfur batteries

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Journal of Energy Chemistry 2025年 109卷 129-137页

作者： Chen, Zi-Xian Zhao, Jia-Jia Fang, Guan-Ya Sun, Furong Zhao, Meng Zhang, Xue-Qiang Li, Bo-Quan Huang, Jia-Qi School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing100081 China Beijing Key Laboratory of Complex Solid State Batteries & Tsinghua Center for Green Chemical Engineering Electrification Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing100084 China Shanxi Research Institute for Clean Energy Tsinghua University Shanxi Taiyuan030032 China

Lithium–sulfur (Li–S) batteries are promising next-generation high-energy-density energy storage devices. However, the failure mechanism of 500 Wh kg−1 level Li–S pouch cells has not been well understood. Herein, quantitative and systematic failure analysis is conducted on 500 Wh kg−1 level Li–S pouch cells to understand the underlying failure mechanism. Focusing on electrolyte exhaustion as the primary cause of cell failure, quantitative analysis methods are established to determine electrolyte occupation by physical infiltration of the cathode, separator, and anode as well as chemical consumption by lithium metal. Insufficient physical infiltration of the cathode caused by irreversible cathode volume expansion is identified as the main cause of electrolyte exhaustion. In comparison, chemical consumption of electrolytes by lithium metal and insufficient anode infiltration have limited influence on cell operations. To address the insufficient cathode infiltration, macropore-rich sulfur cathodes are fabricated to suppress the irreversible volume expansion and prolong the cycling lifespan of Li–S pouch cells by 2.4 times. This work elucidates that the sulfur cathode dominates the cycling lifespan of high-energy-density Li–S batteries and highlights cathode structural design to mitigate irreversible volume expansion for cycling performance improvement. © 2025 Science Press

关键词： Fracture mechanics

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Ptzn/Zno Intermetallic Catalyst Prepared by Reactive Metal-Support Interaction for the Semi-Hydrogenation of 1,4-Butynediol

SSRN

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SSRN 2024年

作者： Chen, Xiao Meng, Longwei Fu, Huiyu Zhou, Quan Liang, Changhai State Key Laboratory of Fine Chemicals Laboratory of Advanced Materials and Catalytic Engineering School of Chemical Engineering Dalian University of Technology Dalian116024 China Key Laboratory of Biotechnology and Bioresources Utilization of Ministry of Education College of Life Science Dalian Minzu University Dalian116600 China

The continuous flow selective hydrogenation of 1,4-butynediol to 2-butene-1,4-diol places high demands on the activity and stability of the catalyst. Herein, an intermetallic PtZn/ZnO catalyst is designed by using the coupling strategy of strong electrostatic adsorption and following reactive metal-support interaction. The TOF value of the Pt/ZnO-H500 catalyst including PtZn intermetallic compound with electron-rich Ptδ- active sites reaches 16.2 h-1, which is almost 9 times higher than that of Pt/ZnO-H200 catalyst with monometallic Pt as active sites. The activation energy of Pt/ZnO-H500 catalyst (35.5 kJ mol-1) is significantly lower than that of Pt/ZnO-H200 catalyst with 49.9 kJ mol-1. In addition, the Pt/ZnO-H500 presents high stability in the continuous flow selective hydrogenation of 1,4-butynediol to 2-butene-1,4-diol for 75 h. These results suggest the intermetallic PtZn/ZnO presents as an alternative Pt-based catalyst with modifying by toxic metals or organic matters and is a promising catalyst for directional hydrogenation in fine chemical synthesis. © 2024, The Authors. All rights reserved.

关键词： Zinc alloys

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Direct oxygen removal from titanium aluminide scraps by yttrium reduction

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2428-2437页

作者： Li-na JIAO Qi-sheng FENG Shi-yu HE Bao-hua DUAN Zhi-he DOU Chong-he LI Xiong-gang LU State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200072China School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of EducationNortheastern UniversityShenyang 110819China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605China School of Materials Science and Engineering Shanghai Dianji UniversityShanghai 201306China

Titanium aluminum(TiAl)scraps with a high oxygen content were treated with yttrium(Y)in a liquid chemical deoxidization process for *** Gibbs free energy and the equilibrium constant of the deoxidization reaction were calculated,and the effects of the yttrium content and the system pressure on the oxygen content in the product were *** results showed that the oxygen in TiAl scraps could be removed by yttrium,and the oxygen content of the deoxidized TiAl scraps had only 10%of the original content after ***,the oxygen content of the deoxidized TiAl scraps was decreased with the increase of yttrium *** higher the chamber pressure,the greater the oxygen content in the final TiAl *** results were consistent with calculated *** microstructure of the deoxidized alloys was akin to that of the original material;however,Y_(2)O_(3) particles were observed in the deoxidized alloys.

关键词： titanium aluminum scrap yttrium deoxidation recycling

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Distinct beneficial effect of Sn on the corrosion resistance of Cr-Mo low alloy steel

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Journal of Materials Science & technology 2021年第22期81卷 175-189页

作者： Meihui Sun Xiaojia Yang Cuiwei Du Zhiyong Liu Yong Li Yumin Wu Hongyu San Xiandong Su Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National Materials Corrosion and Protection Scientific Data Center Institute of Advanced Materials and TechnologyBeijing100083China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China

In this work,the beneficial effect of Sn addition on the corrosion resistance mechanism of Cr-Mo low alloy steel was *** demonstrated that Sn improves the corrosion resistance of the steel matrix mainly by influencing the microstructural *** addition and the synergistic effect of Sn,Cr,and Mo promote the formation of α-FeOOH,SnO_(2),SnO,Cr(OH)_(3),and molybdates,lead to the improved protection and stability of the rust *** synergistic effect also endows the inner rust layer with cation selectivity,preventing the further penetration of Cl-and inhibiting the localized corrosion of steel.

关键词： Sn addition Low alloy steel SKPFM TEM Corrosion resistance

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Modeling and Control of the Modular Multilevel Converter (MMC) based Solid state Transformer (SST) with Magnetic Integration

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CES Transactions on Electrical Machines and Systems 2020年第4期4卷 309-318页

作者： Gengzhe Zheng Yu Chen Yong Kang Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430073China

Solid state transformer(SST)can provide more advanced functionalities compared with conventional transformer,and has great potential in smart grid ***,the SST with medium frequency(MF)isolation link and magnetic integration feature has been proposed,which can reduce the system volume and thus increase the power ***,the magnetic integration also introduces strong coupling between the line frequency(LF)and MF variables,which poses a great challenge on modeling and control *** paper proposes a modeling and control method for an SST with magnetic integration and mixed-frequency modulation.A mathematical model based on dual d-q references is deduced,and then a cascaded control system is designed according to the *** of the controller for the variables at one frequency are properly designed to avoid disturbance from the variables at the other *** simulation and experimental results show good decoupling effect and satisfactory dynamics performance of the proposed control system.

关键词： solid state transformer(SST) modular multilevel converter(MMC) control system mathematical model

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