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Modeling of U-shaped Ba0.5Sr0.5Co0.8Fe0.2O3-δhollow-fiber membrane for oxygen permeation

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Chinese Journal of Chemical Engineering 2017年第7期25卷 892-897页

作者： Huiqi Xie yanying wei Haihui Wang School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

A mathematic model is developed for the perovskite-type mixed ionic-electronic conducting(MIEC) membrane,which makes it possible to simulate the process of oxygen separation in the U-shaped Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_3-δhollow-fiber membrane. The model correlates the oxygen permeation flux to the measurable variables. The trends of calculated results for purge operation coincide well with the experimental data, therefore the model is considerable for flux prediction under vacuum operation. Higher oxygen separation efficiency can be achieved with vacuum operation than purge operation. Parameter study with vacuum operation reveals that oxygen permeation flux increases with higher vacuum levels, and vacuum pressure of around 1.013 × 10~3 Pa is the ***, vacuum operation on the lumen side is much more efficient to achieve higher oxygen permeation flux compared with compression mode on the shell side.

关键词： Membranes Mathematical modeling Separation Oxygen permeation Perovskite

土地利用变化研究动态演化与趋势前沿——基于1990—2020年WoS核心数据库的文献计量分析

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管理评论 2024年第1期36卷 87-102页

作者：王多民于海波皇甫玉斌韦艳莹董祚继中国科学院大学经济与管理学院北京100190 中国科学院大学国家土地科学研究中心北京100190

土地利用变化是全球生态系统、人类健康生存和经济高速发展等全球变化问题的主导因素之一。本文借助CiteSpace软件,对Web of Science核心数据库1990—2020年土地利用变化领域文献进行文献计量分析和知识图谱绘制。分析结果显示,现阶段... 详细信息

土地利用变化是全球生态系统、人类健康生存和经济高速发展等全球变化问题的主导因素之一。本文借助CiteSpace软件,对Web of Science核心数据库1990—2020年土地利用变化领域文献进行文献计量分析和知识图谱绘制。分析结果显示,现阶段土地利用变化研究领域热点集中于土地利用变化时空格局研究、土地利用变化驱动机制研究和土地利用变化影响效应研究。通过共被引分析,本文梳理土地利用变化领域演进的三个阶段,从早期的土地利用变化空间模型,进一步拓展到多学科研究领域,至近期的土地利用变化对生物多样性、森林变化量、气候变化和水文等领域的影响。使用突现分析未来研究趋势主要集中在:(1)全球环境和对应的环境政策对于土地利用变化响应研究;(2)多源地理空间数据和多尺度数据支持下提升城市扩张模型分辨率和精度研究;(3)评估土地利用变化对生态系统服务影响及形成机制研究。本文对新兴研究趋势进行文献计量分析有助于完善现有土地利用变化理论研究,对各学科交叉下的土地利用变化研究问题具有启发性,也为新时代国土空间规划政策制定提供参考。

关键词：土地利用变化知识图谱文献计量战略坐标图

Water’s motions in x–y and z directions of 2D nanochannels:Entirely different but tightly coupled

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Nano Research 2023年第5期16卷 6298-6307页

作者： Shouwei Liao Qia Ke yanying wei Libo Li Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry&Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

Two-dimensional(2D)material-based membrane separation has attracted increasing attention due to its promising performance compared with traditional ***,in-depth understanding of water transportation behavior in such confined nanochannels is still lacking,which hinders the development of 2D nanosheets ***,we investigated water confined in graphene or MoS_(2)nanochannels by molecular dynamics(MD)simulations and found water’s diffusivity always varied linearly with their mean square displacement along z direction(Δz^(2))when system variables(e.g.,water molecules’number,channel height,nonbonded interaction parameter,harmonic potential constraining water’s z-coordinate)*** linear correlation applies to different water models and different force fields(FFs)of channel walls(e.g.,different Lennard–Jones parameters or even flexible FF),no matter whether water molecules form 3-,2-,or quasi-2-layer structure in the *** indicates,though water molecules’motion along z direction(z-fluctuation,confined within 1 nm)and that in xy plane(xydiffusion)are entirely different,they are tightly coupled:Violent z-fluctuation would produce more transient void to facilitate xydiffusion,which is to the sharp contrary of bulk water,where motions in x,y,z directions are symmetric,but *** work could help design high performance 2D nanochannels and discover more novel principles in nano-fluidics and membrane separation fields.

关键词： graphene membranes nanochannel nanofluidics water diffusion

Research progress on the substrate for metal-organic framework(MOF) membrane growth for separation

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Chinese Journal of Chemical Engineering 2023年第4期56卷 299-313页

作者： Wufeng Wu Xilu Hong Jiang Fan yanying wei Haihui Wang School of Chemistry&Chemical Engineering South China University of TechnologyGuangzhou 510640China Beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

During the last decade, metal-organic frameworks(MOFs) have been applied in various fields due to their unique chemical and functional advantages. One of the widespread research hotspots is MOF-based membranes for separations, specifically continuous defect-free MOF membranes, which are usually grown on porous substrates. The substrate not only serves as the MOF layer support but also has a great influence on the membrane fabrication process and the final separation performance of the resultant membrane. In this review, we mainly introduce the progress focused on the substrates for MOF membranes fabrication. The substrate modifications and seeding methods aimed at synthesizing highquality MOF membranes are also summarized systematically.

关键词： Membrane separation MOF membrane Metal-organic frameworks Support Synthesis

Toughening of vinyl ester resins by two-dimensional MXene nanosheets

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Frontiers of Chemical Science and Engineering 2022年第11期16卷 1651-1658页

作者： Yurun Dai Heng Fang Zong Lu Zhuohong Yang yanying wei School of Chemistry and Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510640China Key Laboratory for Bio-based Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642China

Two-dimensional nanosheets are highly effective tougheners for vinyl ester *** toughening effect is related to the high specific surface area and unique two-dimensional planar structure of the *** this study,a coupling agentγ-(2,3-epoxypropoxy)propytrimethoxysilane(Kh-560)was used to modify MXene nanosheets(M-MXene)for use in toughening vinyl ester *** mechanical properties,including the tensile strength,flexural strength,Young’s modulus and elongation,of neat vinyl ester resin and vinyl ester resin modified with MXene and M-MXene were *** results showed that modification significantly improved the mechanical properties of the vinyl ester *** tensile and flexural strengths of the MXene-nanosheet-modified vinyl ester resin were 27.20%and 25.32%higher,respectively,than those of the neat vinyl ester *** coupling agent improved the interfacial compatibility between the MXene nanosheets and vinyl ester resin,which resulted in the tensile and flexural strengths of the M-MXene-nanosheet-modified vinyl ester resin being 52.57%and 54.60%higher,respectively,than those of the neat vinyl ester resin for a loading quantity of nanosheets of only 0.04 wt%,which is economically *** main mechanisms by which the nanosheets toughen the resin are crack deflection and crack pinning.

关键词： MXene nanosheets 2D material vinyl ester resin modification coupling agent

Sub-10 fs laser pulses with repetition rate of 1.1 GHz by a Ti:sapphire oscillator

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Chinese Science Bulletin 2009年第20期54卷 3649-3652页

作者： ZHANG Qing ZHAO yanying wei ZhiYi Institute of Physics Chinese Academy of Sciences Beijing 100190 China

We demonstrate a compact Ti:sapphire oscillator with ring cavity *** optimizing the intra-cavity dispersion with chirped mirrors,pulses with repetition rate of 1.1 GHz are coupled out by the uncoated wedges in the *** 7W CW pump laser centered at 532 nm,the average power of the output pulses is about 30 mW,the duration is less than 10fs and the spectrum spans from 670 nm to 920 nm.

关键词：激光脉冲重复率振荡器蓝宝石 GHz 财政 32纳米钛

Recent progress of two-dimensional nanosheet membranes and composite membranes for separation applications

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Frontiers of Chemical Science and Engineering 2021年第4期15卷 793-819,F0004页

作者： wei Wang yanying wei Jiang Fan Jiahao Cai Zong Lu Li Ding Haihui Wang School of Chemistry&Chemical Engineering South China University of TechnologyGuangzhou 510640China

Two-dimensional(2D)materials have emerged as a class of promising materials to prepare high-performance 2D membranes for various separation *** precise control of the interlayer nano-channel/sub-nanochannel between nanosheets or the pore size of nanosheets within 2D membranes enables 2D membranes to achieve promising molecular sieving *** date,many 2D membranes with high permeability and high selectivity have been reported,exhibiting high separation *** review presents the development,progress,and recent breakthrough of different types of 2D membranes,including membranes based on porous and non-porous 2D nanosheets for various *** mechanism of 2D membranes and their fabrication methods are also *** but not the least,challenges and future directions of 2D membranes for wide utilization are discussed in brief.

关键词： membrane separation 2D membranes,2D materials nanosheet

Novel membrane separation technologies and membrane processes

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Frontiers of Chemical Science and Engineering 2021年第4期15卷 717-719页

作者： yanying wei Gongping Liu Jianquan Luo Libo Li Zhi Xu School of Chemistry&Chemical Engineering South China University of TechnologyGuangzhou 510640China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringUniversity of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100190China State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Membrane-based separation technologies have received increasing attention attributing to lots of advantages such as the low energy consumption,easy operation,and environmental *** recent years,the emergence of novel two-dimensional(2D)materials,such as graphene,provides a new opportunity for membrane ***,Frontiers of Chemical Science and Engineering(FCSE),one of the transactions of Chinese Academy of Engineering,organized this Special Issue aiming to illustrate some of the exciting progresses and achievements in the relevant research fields.

关键词： development. separation friend

Two-dimensional Cu-porphyrin nanosheet membranes for nanofiltration

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Nano Research 2023年第5期16卷 6290-6297页

作者： Jiahao Cai Shizheng Song Lijie Zhu Qipeng Lu Zong Lu yanying wei Haihui Wang School of Chemistry&Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510640China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

A kind of two-dimensional(2D)metal-organic framework(MOF)material,Cu-meso-tetrakis(4-carboxyphenyl)porphine(Cu-TCPP)nanosheets with wrinkled and flat morphologies are used as building blocks to assemble membranes by vacuum filtration(VF)and electrophoretic deposition(EPD)as energy-efficient nanofiltration(NF)membranes to remove dyes from *** the nanosheets with wrinkled structure can provide additional water transport channels,thereby increasing the water permeance,in the premise of a high rejection(>97.0%)for the dye brilliant blue G(BBG)(1.60 nm×1.90 nm),the water permeance of the membrane assembled by the wrinkled nanosheets(~1170 nm)is about 4 times that of the membrane assembled by the flat nanosheets(~530 nm),reaching 16.39 L·m^(−2)·h^(−1)·bar^(−1).Additionally,the use of the relatively flat nanosheets and the membrane preparation method of electrophoretic deposition is more conducive to stack nanosheets orderly and reduce ***,the water permeance of the membrane prepared by EPD(~1170 nm)with flat nanosheets is about twice that of the membrane prepared by VF(~530 nm),achieving 9.40 L·m^(−2)·h^(−1)·bar^(−1)with similar rejection(>97.0%)of dye evans blue(EB)(3.10 nm×1.20 nm).Furthermore,these membranes still exhibit good separation performance at high pressure of 0.6 *** with diverse structures and various membrane fabrication processes provide new directions for the separation performance optimization of 2D MOF materials for water purification.

关键词： two-dimensional material membrane metal-organic framework(MOF) nanofiltration nanosheet morphology electrophoretic deposition