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Flow field analyses of a porous membrane-separated,double-layered microfluidic chip for cell co-culture

Acta Mechanica Sinica 2020年第3期36卷 754-767页

作者： Shenbao Chen Jian Xue Jinrong Hu Qihan Ding Luwen Zhou Shiliang Feng Yuhong Cui Shouqin Lu Mian Long Center of Biomechanics and Bioengineering Key Laboratory of Microgravity(National Microgravity Laboratory)Beijing Key Laboratory of Engineered Construction and Mechanobiologyand CAS Center for Excellence in Complex System MechanicsInstitute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Nonlinear Mechanics(LNM) Institute of MechanicsChinese Academy of SciencesBeijing 100190China Faculty of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211ZhejiangChina Department of Mechanics Tianjin UniversityTianjin 300072China

Organs-on-chips composed of a porous membrane-separated,double-layered channels are used widely in elucidating the effects of cell co-culture and flow shear on biological *** the diversity of channel geometry and membrane permeability is applied,their quantitative correlation with flow features is still *** boundary methods(IBM)simulations and theoretical modelling were performed in this *** simulations showed that channel length,height and membrane permeability jointly regulated the flow features of flux,penetration velocity and wall shear stress(WSS).Increase of channel length,lower channel height or membrane permeability monotonically reduced the flow flux,velocity and WSS in upper channel before reaching a *** the flow flux in lower channel monotonically increased with the increase of each factor,the WSS surprisingly exhibited a biphasic pattern with first increase and then decrease with increase of lower channel ***,the transition threshold of maximum WSS was sensitive to the channel length and membrane *** modeling,integrating the transmembrane pressure difference and inlet flow flux with chip geometry and membrane permeability,was in good agreement with IBM *** analyses provided theoretical bases for optimizing flow-specified chip design and evaluating flow microenvironments of in vivo tissue.

关键词： Immersed boundary method porous membrane Wall shear stress Penetration velocity Microfluidic chip

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Mathematical Model of Gas Permeation Through PTFE porous membrane and the Effect of membrane Pore Structure

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Chinese Journal of Chemical Engineering 2003年第4期11卷 383-387页

作者：张秀莉张卫东郝新敏张慧峰张泽廷张建春 College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029 China Textile Institute Donghua University Shanghai 200051 China Textile Institute Donghua UniversityShanghai 200051 China

membrane-based separation processes are new technology combined membrane separation with conventional separation. Hydrophobic porous membranes are often used in these processes. The structure of hydrophobic porous membrane has significant effect on mass transfer process. The permeabilities of five kinds of gas, He, N2, O2, CO2 and water vapor, across six polytetrafluoroethylene(PTFE) flat membranes were tested experimentally. Results indicated that the greater the membrane mean pore size and the wider the pore size distribution are, the higher the gas permeability. A gas permeation model, including the effects of membrane structure parameter and gas properties, was established. A comprehensive characteristic parameter (including porosity, thickness and tortuosity) was found more effective to express the influence of membrane structure in gas permeation process. The predicted permeation coefficients were in good agreement with experimental data.

关键词： porous membrane gas permeability mathematical model

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Highly efficient vanadium redox flow batteries enabled by a trilayer polybenzimidazole membrane assembly

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Carbon Energy 2024年第7期6卷 191-204页

作者： Trung Tuyen Bui Mingyu Shin Mohammad Rahimi Anders Bentien Yongchai Kwon Dirk Henkensmeier Hydrogen·Fuel Cell Research Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Seoul National University of Science and TechnologySeoulRepublic of Korea Department of Biological and Chemical Engineering Aarhus UniversityAarhusDenmark KIST School Division of Energy and Environment TechnologyUniversity of Science and TechnologySeoulRepublic of Korea Graduate School of Energy and Environment Korea UniversitySeoulRepublic of Korea

A novel polybenzimidazole(PBI)-based trilayer membrane assembly is developed for application in vanadium redox flow battery(VRFB).The membrane comprises a 1μm thin cross-linked poly[2,2′-(p-oxydiphenylene)−5,5′-bibenzimidazole](OPBI)sandwiched between two 20μm thick porous OPBI membranes(p-OPBI)without further lamination *** trilayer membrane demonstrates exceptional properties,such as high conductivity and low area-specific resistance(ASR)of 51 mS cm−1 and 81mΩcm^(2),*** with vanadium electrolyte increases the ASR of trilayer membrane only to 158mΩcm^(2),while that of Nafion is 193mΩcm^(2).VO^(2+)permeability is 2.73×10^(-9) cm^(2) min^(−1),about 150 times lower than that of Nafion *** addition,the membrane has high mechanical strength and high chemical stability against VO^(2+).In VRFB,the combination of low resistance and low vanadium permeability results in excellent performance,revealing high Coulombic efficiency(>99%),high energy efficiency(EE;90.8%at current density of 80mA cm^(−2)),and long-term *** EE is one of the best reported to date.

关键词： polybenzimidazole porous membrane proton conductivity trilayer VRFBs

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Ion-conducting membranes Based on Bacterial Cellulose Nanofibers Modified by Poly(sodium acrylate-co-2-acrylamido-2-methylpropanesulfonic acid)

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Chinese Journal of Polymer Science 2024年第3期42卷 333-343,I0007页

作者： Elizaveta V.Batishcheva Nikolay N.Smirnov Natalya V.Bobrova Maria P.Sokolova Michael A.Smirnov Institute of Macromolecular Compounds Russian Academy of SciencesBolshoy pr.31Saint Petersburg 199004Russia

Green method for preparation of ion-conducting membranes(ICM) based on bacterial cellulose nanofibers(CNF) modified by a copolymer of sodium acrylate and 2-acrylamido-2-methylpropanesulfonic acid was elaborated. FTIR and NMR data confirmed grafting of polyacrylate onto cellulose surface. Formation of porous structure of the ICM was controlled by SEM and AFM. The maximal ionic conductivity of the membranes reaches 1.5 and 3.1 mS·cm^(-1)(60 ℃ and 98% relative humidity) when they are saturated with water or H_2SO_4(1 mol·L^(-1)) electrolyte,respectively. Prepared ICM was tested as a separator in a symmetrical supercapacitor with electrodes based on polyaniline hydrogel. The assembled cell demonstrate ability to operate at high current density up to 100 A·g^(-1) maintaining specific capacitance 165 F·g^(-1). Maximal specific capacitance of 289 F·g^(-1) was achieved at current density 1 A·g^(-1). Retaining of 90% of initial capacitance after 10000 of charge-discharge cycles proves high electrochemical stability of prepared ICM.

关键词： Bacterial cellulose Ion conductivity porous membrane Supercapacitor

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porous membranes with Special Wettabilities:Designed Fabrication and Emerging Application

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CCS Chemistry 2021年第3期3卷 2280-2297页

作者： Jiancheng Di Li Li Qifei Wang Jihong Yu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012 International Center of Future Science Jilin UniversityChangchun 130012

porous materials have become a burgeoning research interest in materials science because of their intrinsic porous characteristics,versatile chemical compositions,and abundant ***,inspired by natural superwetting surfaces originating from the cooperation of surface energy and surface geometry,porous membranes with special wettabilities are finding emerging opportunities associated with a wide variety of environmental and energy-related *** review will present an overview of the state-of-the-art research on the designed fabrications and applications of superwetting porous membranes based on zeolites,metal–organic frameworks(MOFs),porous organic materials(POMs),and mesoporous *** synthetic strategies for the fabrication of porous membranes(e.g.,hydrothermal/solvothermal crystallization,interfacial polymerization,electrospinning,etc.),and principles for tuning the wettability of porous membranes through surface energy modulation are ***,their emerging applications as oil–water separation membranes,lithium-ionbattery separators,self-cleaning layers,and anticorrosion coatings are ***,we emphasize on future perspectives regarding the development of superwetting porous membranes for practical applications.

关键词： porous membrane wettability battery separator oil–water separation functional coating

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Preparation and properties of gel membrane containing porous PVDF-HFP matrix and cross-linked PEG for lithium ion conduction

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Frontiers of Chemical Science and Engineering 2008年第1期2卷 89-94页

作者： Mei ZHANG Aiqing ZHANG Zhenyu CUI Baoku ZHU Gaige HAN Youyi XU Institute of Polymer Science Zhejiang UniversityHangzhou 310027China College of Chemistry and Materials Science South-Central University for NationalitiesWuhan 430074China

Lithium ion conducting membranes are the key materials for lithium *** lithium ion conducting gel polymer electrolyte membrane(Li-GPEM)based on porous poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)matrix and cross-linked PEG network is pre-pared by a typical phase inversion *** immersing theporousPVDF-HFPmembraneinliquidelectrolytecon-taining poly(ethylene glycol)diacrylate(PEGDA)and an initiator to absorb the liquid electrolyte at 25℃,and then thermally cross-linking at 60℃,the Li-GPEM is fabricated *** measurements on its weight loss,mech-anical and electrochemical properties reveal that the obtained Li-GPEM has better overall performance than the liquid and blend gel systems used as conductive media in lithium *** ionic conductivity of the fabricated Li-GPEM can reach as high as 2.25×10^(-3) S/cm at 25℃.

关键词： poly(vinylidene fluoride-co-hexafluoropro-pylene) lithium ion polyethylene glycol gel electrolyte porous membrane

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Harvesting Microalgae Biomass Using Sulfonated Polyethersulfone(SPES)/PES porous membranes in Forward Osmosis Processes

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Journal of Ocean University of China 2020年第6期19卷 1345-1352页

作者： ZHOU Qi YANG Yang WANG Xiaojuan WANG Qun WANG Shuxin GAO Xueli GAO Congjie Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationOcean University of ChinaQingdao 266100China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Zhaoyuan Marine and Fishery Supervision and Inspection Squadron Zhaoyuan 265400China

This study was performed to investigate the availability of forward osmosis(FO)for microalgae harvesting using sulfonated polyethersulfone(SPES)/PES porous *** FO process,porous membranes(membranes(membrane *** effects of SPES content on pore structure and separation performance were *** with pure PES porous membranes,porous membranes with 40%SPES yielded an improved hydrophilicity and greater *** exhibited two times higher water fluxes than the pure PES porous *** microalgae harvesting,AL-FS mode(active layer facing the feed solution)was more favourable than AL-DS mode(active layer facing the draw solution)because less deposited microalgae on the active layer mitigate the membrane *** operation combined with SPES/PES porous membranes is conducive to preserving microalgae cell integrity under the mild *** addition,FO membrane can be cleaned by a simple water *** implications were highlighted as a sustainable method for microalgae harvesting because of no pressure input and less chemical cleaning demand.

关键词： forward osmosis porous membrane sulfonated polyethersulfone microalgae harvesting cell integrity

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Hydrogen-Bonded, Hierarchically Structured Single-Component Chiral Poly(ionic liquid) porous membranes: Facile Fabrication and Application in Enantioselective Separation

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CCS Chemistry 2022年第9期4卷 2930-2937页

作者： Binmin Wang Lei Wang Zhengtai Zha Yingyi Hu Luyao Xu Hong Wang Key Laboratory of Functional Polymer Materials Ministry of EducationInstitute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071 School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021

The development of strategies for producing welldefined chiral porous membranes for the rapid and efficient enantioseparation of racemic mixtures remains a great ***,we introduce an innovative,simple,and easily scalable synthetic strategy to manufacture chiral porous polymer membranes(CPPMs)bearing chiral NH groups by crosslinking single-component chiral poly(ionic liquid)s(PILs)with water molecules via hydrogen(H)-bonding.

关键词： poly(ionic liquid) porous membrane hierarchical architecture hydrogen-bonding chirality

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Light-driven directional ion transport for enhanced osmotic energy harvesting

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National Science Review 2021年第8期8卷 178-185页

作者： Kai Xiao Paolo Giusto Fengxiang Chen Ruotian Chen Tobias Heil Shaowen Cao Lu Chen Fengtao Fan Lei Jiang Max Planck Institute of Colloids and Interfaces Department of Colloid Chemistry Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang University State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University State Key Laboratory of Catalysis 2011-iChEMDalian National Laboratory for Clean Energy (DNL)Dalian Institute of Chemical Physics(DICP)Chinese Academy of Sciences State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Light-driven ion(proton) transport is a crucial process both for photosynthesis of green plants and solar energy harvesting of some archaea. Here, we describe use of a TiO2/C3N4semiconductor heterojunction nanotube membrane to realize similar light-driven directional ion transport performance to that of biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, the TiO2/C3N4heterojunction nanotube membrane can generate a photocurrent of about 9 μA/cm~2, corresponding to a pumping stream of ～5500 ions per second per nanotube. By changing the position of TiO2and C3N4, a reverse equivalent ionic current can also be realized. Directional transport of photogenerated electrons and holes results in a transmembrane potential, which is the basis of the light-driven ion transport phenomenon. As a proof of concept, we also show that this system can be used for enhanced osmotic energy generation. The artificial light-driven ion transport system proposed here offers a further step forward on the roadmap for development of ionic photoelectric conversion and integration into other applications, for example water desalination.

关键词： ion pump ion transport nanofluidic porous membrane carbon nitride

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Poly(vinylidene fluoride)Separators with Dual-asymmetric Structure for High-performance Lithium Ion Batteries

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Chinese Journal of Polymer Science 2016年第12期34卷 1423-1435页

作者： Hong-qing Liang Ling-shu Wan 徐志康 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University

Dual-asymmetric poly（vinylidene fluoride）（PVDF） separators have been fabricated by thermally induced phase separation with dimethyl sulfone （DMSO2） and glycerol as mixed diluents. The separators have a porous bulk with large interconnected pores （-1.0 μm） and two surfaces with small pores （-30 nm）. This dual-asymmetric porous structure endows the separators with higher electrolyte uptake amount and rapider uptake rate, as well as better electrolyte retention ability than the commercialized Celgard 2400. The separators even maintain their dimensional stability up to 160 ℃, at which temperature the surface pores close up, leading to a dramatic decrease of air permeability. The electrolyte filled separators also show high ion conductivity （1.72 ***-1） at room temperature. Lithium iron phosphate （LiFePO4）/lithium （Li） cells using these separators display superior discharge capacity and better rate performance as compared with those from the commercialized ones. The results provide new insight into the design and development of separators for high-performance lithium ion batteries with enhanced safety.

关键词： Polymer separator Lithium ion battery Dual-asymmetric structure porous membrane Thermally induced phaseseparation.

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