1
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Córdoba A, Montes de Oca JM, Darling SB, de Pablo JJ. Influence of the Dielectric Constant on the Ionic Current Rectification of Bipolar Nanopores. ACS NANO 2024; 18:12569-12579. [PMID: 38696274 DOI: 10.1021/acsnano.4c03546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2024]
Abstract
In this paper, we investigate how the dielectric constant, ϵ, of an electrolyte solvent influences the current rectification characteristics of bipolar nanopores. It is well recognized that bipolar nanopores with two oppositely charged regions rectify current when exposed to an alternating electric potential difference. Here, we consider dilute electrolytes with NaCl only and with a mixture of NaCl and charged nanoparticles. These systems are studied using two levels of description, all-atom explicit water molecular dynamics (MD) simulations and coarse-grained implicit solvent MD simulations. The charge density and electric potential profiles and current-voltage relationship predicted by the implicit solvent simulations with ϵ = 11.3 show good agreement with the predictions from the explicit water simulations. Under nonequilibrium conditions, the predictions of the implicit solvent simulations with a dielectric constant closer to the one of bulk water are significantly different from the predictions obtained with the explicit water model. These findings are closely aligned with experimental data on the dielectric constant of water when confined to nanometric spaces, which suggests that ϵ decreases significantly compared to its value in the bulk. Moreover, the largest electric current rectification is observed in systems containing nanoparticles when ϵ = 78.8. Using enhanced sampling, we have shown that this larger rectification arises from the presence of a significantly deeper minimum in the free energy of the system with a larger ϵ, and when a negative voltage bias is applied. Since implicit solvent models and mean-field continuum theories are often used to design Janus membranes based on bipolar nanopores, this work highlights the importance of properly accounting for the effects of confinement on the dielectric constant of the electrolyte solvent. The results presented here indicate that the dielectric constant in implicit solvent simulations may be used as an adjustable parameter to approximately account for the effects of nanometric confinement on aqueous electrolyte solvents.
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Affiliation(s)
- Andrés Córdoba
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Advanced Materials for Energy-Water Systems (AMEWS) Energy Frontier Research Center, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Joan Manuel Montes de Oca
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Advanced Materials for Energy-Water Systems (AMEWS) Energy Frontier Research Center, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Seth B Darling
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Advanced Materials for Energy-Water Systems (AMEWS) Energy Frontier Research Center, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Juan J de Pablo
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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2
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Wang Q, Chun J, Subban CV. Influence of Concentration Gradients on Electroconvection at a Cation-Exchange Membrane Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1613-1622. [PMID: 38181224 DOI: 10.1021/acs.langmuir.3c02453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2024]
Abstract
Membrane-based systems, such as electrodialysis, play an important role in desalination and industrial separation processes. Electrodialysis uses alternating anion- and cation-exchange membranes with a perpendicular electric field to generate concentrated and diluate streams from a feed solution. It is known that under overlimiting current conditions, reduced charge and mass transfer at the membrane interface leads to regions of high ion depletion generating instability and vortices termed electroconvection. While electroconvective mixing is known to directly impact the separation efficiency of electrodialysis, the influence of ion concentration gradients across the membrane experienced in a functional electrodialysis system is not known. Here, we report the influence of ion concentration gradients across a cation exchange membrane (Nafion) that is both aligned with and opposed to the applied electric field. Experiments were conducted by coflowing NaCl solutions of different concentrations (0.1-100 mM) on each side of the membrane, and electroconvection was visualized with a fluorescence dye (Rhodamine 6G). We obtained concentration profiles from fluorescence image data and systematically measured the thickness of the depletion boundary layer dBL under different conditions. We found smaller dBL values at a higher flow rate both with and without concentration gradients. Our results show that electroconvection is enhanced when the electric field is opposite to the direction of the concentration gradient.
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Affiliation(s)
- Qingpu Wang
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Seattle, Washington 98109, United States
| | - Jaehun Chun
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Chinmayee V Subban
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Seattle, Washington 98109, United States
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
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3
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Kovalenko A, Urtenov M, Chekanov V, Kandaurova N. Theoretical Analysis of the Influence of Spacers on Salt Ion Transport in Electromembrane Systems Considering the Main Coupled Effects. MEMBRANES 2024; 14:20. [PMID: 38248710 PMCID: PMC10820503 DOI: 10.3390/membranes14010020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/02/2024] [Accepted: 01/04/2024] [Indexed: 01/23/2024]
Abstract
This article considers a theoretical analysis of the influence of the main coupled effects and spacers on the transfer of salt ions in electromembrane systems (EMS) using a 2D mathematical model of the transfer process in a desalting channel with spacers based on boundary value problems for the coupled system of Nernst-Planck-Poisson and Navier-Stokes equations. The basic patterns of salt ion transport have been established, taking into account diffusion, electromigration, forced convection, electroconvection, dissociation/recombination reactions of water molecules, as well as spacers located inside the desalting channel. It has been shown that spacers and taking into account the dissociation/recombination reaction of water molecules significantly change both the formation and development of electroconvection. This article confirms the fact of the exaltation of the limiting current studied by Harkatz, where it is shown that the current (flux) of salt ions increases when the dissociation reaction begins by a certain value called the exaltation current, which is proportional to the flow of water dissociation products. A significant combined effect of electroconvection and dissociation/recombination reactions as well as the spacer system in the desalting channel on the transport of salt ions are shown. The complex, nonlinear, and non-stationary interaction of all the main effects of concentration polarization and spacers in the desalting channel are also considered in the work.
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Affiliation(s)
- Anna Kovalenko
- Faculty of Computer Technologies and Applied Mathematics, Kuban State University, 350040 Krasnodar, Russia;
| | - Makhamet Urtenov
- Faculty of Computer Technologies and Applied Mathematics, Kuban State University, 350040 Krasnodar, Russia;
| | - Vladimir Chekanov
- Department of Digital Development, North-Caucasus Federal University, 355017 Stavropol, Russia;
| | - Natalya Kandaurova
- Department of Information Technologies, MIREA-Russian Technological University, 355000 Stavropol, Russia;
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4
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Batko K, Ślęzak-Prochazka I, Sokołowska W, Rak M, Płonka W, Ślęzak A. The Role of the Gravitational Field in Generating Electric Potentials in a Double-Membrane System for Concentration Polarization Conditions. MEMBRANES 2023; 13:833. [PMID: 37888005 PMCID: PMC10608946 DOI: 10.3390/membranes13100833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 10/01/2023] [Accepted: 10/11/2023] [Indexed: 10/28/2023]
Abstract
Electric potentials referred to as the gravielectric effect (∆ΨS) are generated in a double-membrane system containing identical polymer membranes set in horizontal planes and separating non-homogenous electrolyte solutions. The gravielectric effect depends on the concentration and composition of the solutions and is formed due to the gravitational field breaking the symmetry of membrane complexes/concentration boundary layers formed under concentration polarization conditions. As a part of the Kedem-Katchalsky formalism, a model of ion transport was developed, containing the transport parameters of membranes and solutions and taking into account hydrodynamic (convective) instabilities. The transition from non-convective to convective or vice versa can be controlled by a dimensionless concentration polarization factor or concentration Rayleigh number. Using the original measuring set, the time dependence of the membrane potentials was investigated. For steady states, the ∆ΨS was calculated and then the concentration characteristics of this effect were determined for aqueous solutions of NaCl and ethanol. The results obtained from the calculations based on the mathematical model of the gravitational effect are consistent with the experimental results within a 7% error range. It has been shown that a positive or negative gravielectric effect appeared when a density of the solution in the inter-membrane compartment was higher or lower than the density in the outer compartments. The values of the ∆ΨS were in a range from 0 to 27 mV. It was found that, the lower the concentration of solutions in the outer compartments of the two-membrane system (C0), for the same values of Cm/C0, the higher the ∆ΨS, which indicates control properties of the double-membrane system. The considered two-membrane electrochemical system is a source of electromotive force and functions as an electrochemical gravireceptor.
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Affiliation(s)
- Kornelia Batko
- Institute of Political Science, University of Silesia, 11 Bankowa Str., 40287 Katowice, Poland
| | - Izabella Ślęzak-Prochazka
- Department of Systems Biology and Engineering, Silesian University of Technology, Akademicka 2A, 44100 Gliwice, Poland;
- Biotechnology Centre, Silesian University of Technology, Akademicka 2A, 44100 Gliwice, Poland; (W.S.); (M.R.)
| | - Weronika Sokołowska
- Biotechnology Centre, Silesian University of Technology, Akademicka 2A, 44100 Gliwice, Poland; (W.S.); (M.R.)
| | - Małgorzata Rak
- Biotechnology Centre, Silesian University of Technology, Akademicka 2A, 44100 Gliwice, Poland; (W.S.); (M.R.)
| | - Wiktoria Płonka
- Biotechnology Centre, Silesian University of Technology, Akademicka 2A, 44100 Gliwice, Poland; (W.S.); (M.R.)
| | - Andrzej Ślęzak
- Collegium Medicum, Jan Dlugosz University, 13/15 Armia Krajowa Al, 42200 Częstochowa, Poland;
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Rhee H, Kwak R. Induced-charge membrane capacitive deionization enables high-efficient desalination with polarized porous electrodes. WATER RESEARCH 2023; 244:120436. [PMID: 37556990 DOI: 10.1016/j.watres.2023.120436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 07/26/2023] [Accepted: 07/29/2023] [Indexed: 08/11/2023]
Abstract
Exposure of a conducting porous material to an electric field in electrolytes induces an electric dipole, which results in capacitive charging of cations and anions at opposite poles. In this letter, we investigate a novel desalination method using this induced-charge capacitive deionization (ICCDI). To do this, we devise a microscale ICCDI platform that can visualize in situ ion concentrations, pH shifts, and fluid flows, and study ion transport dynamics and desalination performances compared to conventional CDI with unipolar / bipolar connections. Similar ion concentration and fluid flow characteristics were observed in Ohmic, limiting, and over-limiting regimes, but variations in desalination performance trends were noted based on the number of stacks. In a single cell, ICCDI generates a higher electric field at the opposite poles of porous electrodes than simple conducted electrodes in CDIs with unipolar/bipolar connections, leading to superior salt removal and/or lower ionic current at a given applied voltage. This marks a clear contrast from CDI with bipolar connection, which lacks any advantage over CDI with unipolar connection in a single cell. These metrics of ICCDI however deteriorated as the stack number increased, likely due to short-circuiting between the dipoles. As a result, ICCDI in current form shows higher desalination efficient than conventional CDIs with low stack numbers (< 6), so we offer the scale-up module by repeating 4-stack ICCDI units. Our study enhances comprehension of ion transport dynamics and desalination performance in ICCDI, and the results could aid in the development of ICCDI for energy/cost-efficient desalination.
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Affiliation(s)
- Hahnsoll Rhee
- Department of Mechanical Convergence Engineering, Hanyang University, Republic of Korea
| | - Rhokyun Kwak
- Department of Mechanical Convergence Engineering, Hanyang University, Republic of Korea; Institute of Nano Science and Technology, Hanyang University, Seoul, Republic of Korea.
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Seo J, Jung S, Park J, Kim HY, Kim SJ. Hierarchical Capillarity-Assisted Liquid Invasion in Multilayered Paper Channels for Nanoelectrokinetic Preconcentration. NANO LETTERS 2023; 23:8065-8072. [PMID: 37581872 DOI: 10.1021/acs.nanolett.3c02044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
A nanoelectrokinetic phenomenon called ion concentration polarization (ICP) has been recently applied to microfluidic paper-based devices for the high fold preconcentration of low-abundant analytes. The inherent microstructural characteristics of cellulose papers can sufficiently stabilize the chaotic electroconvection of ICP, which is a significant annoyance for typical engineered microfluidic channels. However, a high electrical voltage to induce ICP in a paper-fluidic channel can increase unavoidable electrophoretic forces over drag forces so that the preconcentrated plug is rapidly receded with severe dispersion. In order to enhance the hydraulic drag force that helps the preconcentration of analytes, here we introduce a multilayered paper structure into paper-fluidic channel. We theoretically and experimentally demonstrate that a hierarchical capillary structure in a multilayered paper-fluidic channel can effectively increase the hydraulic drag force. For the practical utility in the field of diagnostics, the mechanism is verified by a simple example of the immunoassay using biotin-streptavidin complexation.
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Affiliation(s)
- Joowon Seo
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Sohyun Jung
- Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jihee Park
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Ho-Young Kim
- Department of Mechanical Engineering, Seoul National University, Seoul 08826, Republic of Korea
- SOFT Foundry Institute, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Advanced Machines and Design, Seoul National University, Seoul 08826, Republic of Korea
| | - Sung Jae Kim
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
- SOFT Foundry Institute, Seoul National University, Seoul 08826, Republic of Korea
- Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea
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7
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Ganchenko GS, Alekseev MS, Moroz IA, Mareev SA, Shelistov VS, Demekhin EA. Electrokinetic and Electroconvective Effects in Ternary Electrolyte Near Ion-Selective Microsphere. MEMBRANES 2023; 13:membranes13050503. [PMID: 37233564 DOI: 10.3390/membranes13050503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/05/2023] [Accepted: 05/08/2023] [Indexed: 05/27/2023]
Abstract
The paper presents theoretical and experimental investigations of the behavior of an electrolyte solution with three types of ions near an ion-selective microparticle with electrokinetically and pressure-driven flow. A special experimental cell has been developed for the investigations. An anion-selective spherical particle composed of ion-exchange resin is fixed in the center of the cell. An enriched region with a high salt concentration appears at the anode side of the particle when an electric field is turned on, according to the nonequilibrium electrosmosis behavior. A similar region exists near a flat anion-selective membrane. However, the enriched region near the particle produces a concentration jet that spreads downstream akin to a wake behind an axisymmetrical body. The fluorescent cations of Rhodamine-6G dye are chosen as the third species in the experiments. The ions of Rhodamine-6G have a 10-fold lower diffusion coefficient than the ions of potassium while bearing the same valency. This paper shows that the concentration jet behavior is described accurately enough with the mathematical model of a far axisymmetric wake behind a body in a fluid flow. The third species also forms an enriched jet, but its distribution turns out to be more complex. The concentration of the third species increases in the jet with an increase in pressure gradient. The pressure-driven flow stabilizes the jet, yet electroconvection has been observed near the microparticle for sufficiently strong electric fields. The electrokinetic instability and the electroconvection partially destroy the concentration jet of salt and the third species. The conducted experiments show good qualitative agreement with the numerical simulations. The presented results could be used in future for implementing microdevices based on membrane technology for solving problems of detection and preconcentration, and thus simplifying chemical and medical analyses utilizing the superconcentration phenomenon. Such devices are called membrane sensors, and are actively being studied.
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Affiliation(s)
- Georgy S Ganchenko
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University under the Government of the Russian Federation, 53 Leningradsky Prospect str., Moscow 125167, Russia
| | - Maxim S Alekseev
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University under the Government of the Russian Federation, 53 Leningradsky Prospect str., Moscow 125167, Russia
- Membrane Institute, Kuban State University, 149 Stavropolskaya str., Krasnodar 350040, Russia
| | - Ilya A Moroz
- Membrane Institute, Kuban State University, 149 Stavropolskaya str., Krasnodar 350040, Russia
| | - Semyon A Mareev
- Membrane Institute, Kuban State University, 149 Stavropolskaya str., Krasnodar 350040, Russia
| | - Vladimir S Shelistov
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University under the Government of the Russian Federation, 53 Leningradsky Prospect str., Moscow 125167, Russia
| | - Evgeny A Demekhin
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University under the Government of the Russian Federation, 53 Leningradsky Prospect str., Moscow 125167, Russia
- Laboratory of General Aeromechanics, Institute of Mechanics, Moscow State University, 1 Michurinsky Prospect, Moscow 119192, Russia
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8
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Kozmai AE, Mareev SA, Butylskii DY, Ruleva VD, Pismenskaya ND, Nikonenko VV. Low-frequency impedance of ion-exchange membrane with electrically heterogeneous surface. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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9
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Uzdenova A. Ion Transport in Electromembrane Systems under the Passage of Direct Current: 1D Modelling Approaches. MEMBRANES 2023; 13:421. [PMID: 37103848 PMCID: PMC10146742 DOI: 10.3390/membranes13040421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 04/05/2023] [Accepted: 04/07/2023] [Indexed: 06/19/2023]
Abstract
For a theoretical analysis of mass transfer processes in electromembrane systems, the Nernst-Planck and Poisson equations (NPP) are generally used. In the case of 1D direct-current-mode modelling, a fixed potential (for example, zero) is set on one of the boundaries of the considered region, and on the other-a condition connecting the spatial derivative of the potential and the given current density. Therefore, in the approach based on the system of NPP equations, the accuracy of the solution is significantly affected by the accuracy of calculating the concentration and potential fields at this boundary. This article proposes a new approach to the description of the direct current mode in electromembrane systems, which does not require boundary conditions on the derivative of the potential. The essence of the approach is to replace the Poisson equation in the NPP system with the equation for the displacement current (NPD). Based on the system of NPD equations, the concentration profiles and the electric field were calculated in the depleted diffusion layer near the ion-exchange membrane, as well as in the cross section of the desalination channel under the direct current passage. The NPD system, as well as NPP, allows one to describe the formation of an extended space charge region near the surface of the ion-exchange membrane, which is important for describing overlimiting current modes. Comparison of the direct-current-mode modelling approaches based on NPP and NPD showed that the calculation time is less for the NPP approach, but the calculation accuracy is higher for the NPD approach.
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Affiliation(s)
- Aminat Uzdenova
- Department of Computer Science and Computational Mathematics, Umar Aliev Karachai-Cherkess State University, Karachaevsk 369200, Russia
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10
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Uzdenova A, Kovalenko A, Prosviryakov E, Urtenov M. Mathematical Modeling of the Influence of the Karman Vortex Street on Mass Transfer in Electromembrane Systems. MEMBRANES 2023; 13:membranes13040394. [PMID: 37103821 PMCID: PMC10140957 DOI: 10.3390/membranes13040394] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/26/2023] [Accepted: 03/27/2023] [Indexed: 05/31/2023]
Abstract
In electromembrane systems, the transfer of ions near ion-exchange membranes causes concentration polarization, which significantly complicates mass transfer. Spacers are used to reduce the effect of concentration polarization and increase mass transfer. In this article, for the first time, a theoretical study is carried out, using a two-dimensional mathematical model, of the effect of spacers on the mass transfer process in the desalination channel formed by anion-exchange and cation-exchange membranes under conditions when they cause a developed Karman vortex street. The main idea is that, when the separation of vortices occurs on both sides in turn from the spacer located in the core of the flow where the concentration is maximum, the developed non-stationary Karman vortex street ensures the flow of the solution from the core of the flow alternately into the depleted diffusion layers near the ion-exchange membranes. This reduces the concentration polarization and, accordingly, increases the transport of salt ions. The mathematical model is a boundary value problem for the coupled system of Nernst-Planck-Poisson and Navier-Stokes equations for the potentiodynamic regime. The comparison of the current-voltage characteristics calculated for the desalination channel with and without a spacer showed a significant increase in the intensity of mass transfer due to the development of the Karman vortex street behind the spacer.
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Affiliation(s)
- Aminat Uzdenova
- Department of Computer Science and Computational Mathematics, Umar Aliev Karachai-Cherkess State University, Karachaevsk 369202, Russia
| | - Anna Kovalenko
- Department of Data Analysis and Artificial Intelligence, Kuban State University, Krasnodar 350040, Russia
| | - Evgeniy Prosviryakov
- Department of Information Technologies and Control Systems, Ural Federal University the first President of Russia B. N. Yeltsin, 19 Mira St., Ekaterinburg 620049, Russia
| | - Makhamet Urtenov
- Department of Applied Mathematics, Kuban State University, Krasnodar 350040, Russia
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11
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Lee S, Hong S, Park J, Koh Y, Lee H, Yang J, Seo SW, Kim SJ. dCas9-Mediated PCR-Free Detection of Oncogenic Mutation by Nonequilibrium Nanoelectrokinetic Selective Preconcentration. Anal Chem 2023; 95:5045-5052. [PMID: 36893461 DOI: 10.1021/acs.analchem.2c05539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
Cutting-edge nanoelectrokinetic technology in this work provides a breakthrough for the present clinical demands of molecular diagnosis to detect a trace amount of oncogenic mutation of DNA in a short time without an erroneous PCR procedure. In this work, we combined the sequence-specific labeling scheme of CRISPR/dCas9 and ion concentration polarization (ICP) mechanism to separately preconcentrate target DNA molecules for rapid detection. Using the mobility shift caused by dCas9's specific binding to the mutant, the mutated DNA and normal DNA were distinguished in the microchip. Based on this technique, we successfully demonstrated the dCas9-mediated 1-min detection of single base substitution (SBS) in EGFR DNA, a carcinogenesis indicator. Moreover, the presence/absence of target DNA was identified at a glance like a commercial pregnancy test kit (two lines for positive and one line for negative) by the distinct preconcentration mechanisms of ICP, even at the 0.1% concentration of the target mutant.
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Affiliation(s)
- Sangjun Lee
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Seongjun Hong
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jihee Park
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Youngil Koh
- Department of Internal Medicine, Seoul National University Hospital, Seoul 03080, Republic of Korea
| | - Hyomin Lee
- Department of Chemical and Biological Engineering, Jeju National University, Jeju 63243, Republic of Korea
| | - Jina Yang
- Department of Chemical and Biological Engineering, Jeju National University, Jeju 63243, Republic of Korea
| | - Sang Woo Seo
- School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Sung Jae Kim
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
- SOFT Foundry Institute, Seoul National University, Seoul 08826, Republic of Korea
- Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea
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12
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Stockmeier F, Stüwe L, Kneppeck C, Musholt S, Albert K, Linkhorst J, Wessling M. On the interaction of electroconvection at a membrane interface with the bulk flow in a spacer-filled feed channel. J Memb Sci 2023. [DOI: 10.1016/j.memsci.2023.121589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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13
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Sharma A, Mukherjee A, Warren A, Jin S, Li G, Koch DL, Archer LA. Electroconvective Flow in Liquid Electrolytes Containing Oligomer Additives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:92-100. [PMID: 36549330 DOI: 10.1021/acs.langmuir.2c02210] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Metal electrodeposition in batteries is fundamentally unstable and affected by different instabilities depending on operating conditions and electrolyte chemistry. Particularly, at high charging rates, a hydrodynamic instability loosely termed electroconvection sets in, which complicates all electrochemical processes by creating a nonuniform ion flux and preferential deposition at the electrode. Here, we isolate and study electroconvection by experimentally investigating how oligomer additives in liquid electrolytes interact with the hydrodynamic instability at a cation selective interface. From electrochemical measurements and direct visualization experiments, we find that electroconvection is delayed and suppressed at all voltages in the presence of oligomers. The underlying mechanism is revealed to involve formation of an oligomer ad-layer at the interface, which in response to perturbation is believed to exert an opposing body force on the surrounding fluid to preserve the ad-layer structure and in so doing suppresses electroconvection. Our results therefore reveal that in battery electrolytes without obvious sources of bulk elasticity, surface forces produced by adsorbed polymers can be used to advantage for suppressing instability.
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Affiliation(s)
- Arpita Sharma
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York14853, United States
| | - Ankush Mukherjee
- School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York14853, United States
| | - Alexander Warren
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York14853, United States
| | - Shuo Jin
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York14853, United States
| | - Gaojin Li
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York14853, United States
| | - Donald L Koch
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York14853, United States
| | - Lynden A Archer
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York14853, United States
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Laucirica G, Allegretto JA, Wagner MF, Toimil-Molares ME, Trautmann C, Rafti M, Marmisollé W, Azzaroni O. Switchable Ion Current Saturation Regimes Enabled via Heterostructured Nanofluidic Devices Based on Metal-Organic Frameworks. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2207339. [PMID: 36239253 DOI: 10.1002/adma.202207339] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/27/2022] [Indexed: 06/16/2023]
Abstract
The use of track-etched membranes allows further fine-tuning of transport regimes and thus enables their use in (bio)sensing and energy-harvesting applications, among others. Recently, metal-organic frameworks (MOFs) have been combined with such membranes to further increase their potential. Herein, the creation of a single track-etched nanochannel modified with the UiO-66 MOF is proposed. By the interfacial growth method, UiO-66-confined synthesis fills the nanochannel completely and smoothly, yet its constructional porosity renders a heterostructure along the axial coordinate of the channel. The MOF heterostructure confers notorious changes in the transport regime of the nanofluidic device. In particular, the tortuosity provided by the micro- and mesostructure of UiO-66 added to its charged state leads to iontronic outputs characterized by an asymmetric ion current saturation for transmembrane voltages exceeding 0.3 V. Remarkably, this behavior can be easily and reversibly modulated by changing the pH of the media and it can also be maintained for a wide range of KCl concentrations. In addition, it is found that the modified-nanochannel functionality cannot be explained by considering just the intrinsic microporosity of UiO-66, but rather the constructional porosity that arises during the MOF growth process plays a central and dominant role.
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Affiliation(s)
- Gregorio Laucirica
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CC 16 Suc. 4, La Plata, B1904DPI, Argentina
| | - Juan A Allegretto
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CC 16 Suc. 4, La Plata, B1904DPI, Argentina
| | - Michael F Wagner
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
| | | | - Christina Trautmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- Technische Universität Darmstadt, Materialwissenschaft, 64287, Darmstadt, Germany
| | - Matías Rafti
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CC 16 Suc. 4, La Plata, B1904DPI, Argentina
| | - Waldemar Marmisollé
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CC 16 Suc. 4, La Plata, B1904DPI, Argentina
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CC 16 Suc. 4, La Plata, B1904DPI, Argentina
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15
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Pagáč J, Kovář P, Slouka Z. Electric Potential Profiles in a Model Single-Path Electrodialysis Unit. MEMBRANES 2022; 12:1136. [PMID: 36422128 PMCID: PMC9696545 DOI: 10.3390/membranes12111136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
Electrodialysis is an important electromembrane separation process anticipated to play a significant role in developing future technologies. It produces ion-depleted and ion-concentrated product streams, intrinsically suggesting the formation of spatial gradients of relevant quantities. These quantities affect local conditions in an electrodialysis unit. To investigate the spatial distribution of electric potentials, we constructed a model electrodialysis system with a single diluate channel that included ports for inserting reference electrodes measuring potential profiles. We validated our system and measurement methods in a series of control experiments under a solution flow rate of 250 µL/min and current densities between 10 and 52 A/m2. The collected data showed that the electric potential in the diluate channel did not change in the vertical direction (direction of gravity force), and only minimally varied in the diluate channel center in the flow direction. Although we could not reconstruct the potential profile within ion-depleted layers due to the resolution of the method, we found appreciable potential variation across the diluate channel. The most significant potential drops were localized on the membranes with the developed ion-depleted zones. Interestingly, these potential drops abruptly increased when we applied current loads, yielding almost complete desalination. The increase in the resistance accompanied by relatively large fluctuations in the measured potential indicated the system transition into limiting and overlimiting regions, and the onset of overlimiting convection.
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Affiliation(s)
- Jan Pagáč
- Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 3, 16628 Prague, Czech Republic
| | - Petr Kovář
- Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 3, 16628 Prague, Czech Republic
| | - Zdeněk Slouka
- Department of Chemical Engineering, University of Chemistry and Technology Prague, Technická 3, 16628 Prague, Czech Republic
- New Technologies-Research Centre, University of West Bohemia, Univerzitní 8, 30614 Pilsen, Czech Republic
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16
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Uzdenova A, Kovalenko A, Urtenov M. Theoretical Analysis of Electroconvection in the Electrodialysis Desalination Channel under the Action of Direct Current. MEMBRANES 2022; 12:membranes12111125. [PMID: 36363680 PMCID: PMC9697486 DOI: 10.3390/membranes12111125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/07/2022] [Accepted: 11/08/2022] [Indexed: 05/12/2023]
Abstract
The development of electroconvection in electromembrane systems is a factor that increases the efficiency of the electrolyte solution desalination process. The desalination of the solution, manifested by a change in the distribution of the ion concentration, can affect the mechanisms of development of electroconvection. The purpose of this work is to study the electroconvective flow developing in the desalination channel under various desalination scenarios. The study was carried out on the basis of a mathematical model of the transfer of binary electrolyte ions in the desalination channel formed between the anion and cation exchange membranes under the action of DC current. An analytical estimation of the threshold current density reflecting the conditions of the system transition into a quasi-stationary state has been obtained. The chronopotentiograms of the desalination channel and the thickness of the electroconvective mixing layer are calculated for both pre-threshold and supra-threshold values of the current density.
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Affiliation(s)
- Aminat Uzdenova
- Department of Computer Science and Computational Mathematics, Umar Aliev Karachai-Cherkess State University, 369202 Karachaevsk, Russia
| | - Anna Kovalenko
- Department of Data Analysis and Artificial Intelligence, Kuban State University, 350040 Krasnodar, Russia
- Correspondence:
| | - Makhamet Urtenov
- Department of Applied Mathematics, Kuban State University, 350040 Krasnodar, Russia
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17
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Rybalkina O, Solonchenko K, Chuprynina D, Pismenskaya N, Nikonenko V. Effect of Pulsed Electric Field on the Electrodialysis Performance of Phosphate-Containing Solutions. MEMBRANES 2022; 12:1107. [PMID: 36363662 PMCID: PMC9693851 DOI: 10.3390/membranes12111107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 10/29/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
A comparative analysis of mass transfer characteristics and energy consumption was carried out for the electrodialysis recovery of PV from of NaH2PO4 solutions and multicomponent (0.045 M NaxH(3-x)PO4, 0.02 M KCl, 0.045 M KOH, 0.028 M CaCl2, and 0.012 M MgCl2, pH 6.0 ± 0.1) solution in conventional continuous current (CC) and pulsed electric field (PEF) modes. The advantages of using PEF in comparison with CC mode are shown to increase the current efficiency and reduce energy consumption, as well as reduce scaling on heterogeneous anion-exchange membranes. It has been shown that PEF contributes to the suppression of the "acid dissociation" phenomenon, which is specific for anion-exchange membranes in phosphate-containing solutions. Pulse and pause lapse 0.1 s-0.1 s and duty cycle 1/2 were found to be optimal among the studied PEF parameters.
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Affiliation(s)
- Olesya Rybalkina
- Physical Chemistry Department, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia
| | - Ksenia Solonchenko
- Physical Chemistry Department, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia
| | - Daria Chuprynina
- Analytical Chemistry Department, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia
| | - Natalia Pismenskaya
- Physical Chemistry Department, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia
| | - Victor Nikonenko
- Physical Chemistry Department, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia
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18
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Vasil’eva VI, Akberova EM, Saud AM, Zabolotsky VI. Current-Voltage Characteristics of Membranes with Different Cation-Exchanger Content in Mineral Salt-Neutral Amino Acid Solutions under Electrodialysis. MEMBRANES 2022; 12:1092. [PMID: 36363647 PMCID: PMC9698414 DOI: 10.3390/membranes12111092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/22/2022] [Accepted: 10/31/2022] [Indexed: 06/16/2023]
Abstract
The features of the electrochemical behavior of experimental heterogeneous ion-exchange membranes with different mass fractions of sulfonated cation-exchange resin (from 45 to 65 wt%) have been studied by voltammetry during electrodialysis. Electromembrane systems with 0.01 M NaCl solution and with a mixed 0.01 M NaCl + 0.05 M phenylalanine (Phe) solution have been investigated. A significant influence of the ion-exchanger content on the parameters of current-voltage curves (CVCs) was established for the first time. Electrodialysis of the sodium chloride solution revealed a decrease in the length of the limiting current plateau and in the resistances of the second and third sections of the CVCs with an increase in the resin content in the membrane. The fact of the specific shape of the CVCs of all studied cation-exchange membrane samples in mixed solutions of the mineral salt and the amino acid was established. A specific feature of current-voltage curves is the presence of two plateaus of the limiting current and two values of the limiting current, respectively. This phenomenon in electromembrane systems with neutral amino acids has not been found before. The value of the first limiting current is determined by cations of the mineral salt, which are the main current carriers in the system. The presence of the second plateau and the corresponding second limiting current is due to the appearance of additional carriers due to the ability of phenylalanine as an organic ampholyte to participate in protolytic reactions. In the cation-exchange electromembrane system with the phenylalanine containing solution, two mechanisms of H+/OH- ion generation through water splitting and acid dissociation are shown. The possibility of the generation of H+/OH- ions at the enriched solution/cation-exchange membrane interface during electrodialysis of amino acid containing solutions is shown for the first time. The results of this study can be used to improve the process of electromembrane demineralization of neutral amino acid solutions by both targeted selection or the creation of new membranes and the selection of effective current operating modes.
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Affiliation(s)
- Vera I. Vasil’eva
- Department of Analytical Chemistry, Chemical Faculty, Voronezh State University, Universitetskaya pl. 1, 394018 Voronezh, Russia
| | - Elmara M. Akberova
- Department of Analytical Chemistry, Chemical Faculty, Voronezh State University, Universitetskaya pl. 1, 394018 Voronezh, Russia
| | - Ali M. Saud
- Faculty of Science, Tishreen University, Latakia 2237, Syria
| | - Victor I. Zabolotsky
- Department of Physical Chemistry, Faculty of Chemistry and High Technologies, Kuban State University, ul. Stavropolskaya 149, 350040 Krasnodar, Russia
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Focus on the Electroplating Chemistry of Li Ions in Nonaqueous Liquid Electrolytes: Toward Stable Lithium Metal Batteries. ELECTROCHEM ENERGY R 2022. [DOI: 10.1007/s41918-022-00158-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Loza S, Loza N, Kutenko N, Smyshlyaev N. Profiled Ion-Exchange Membranes for Reverse and Conventional Electrodialysis. MEMBRANES 2022; 12:membranes12100985. [PMID: 36295744 PMCID: PMC9609011 DOI: 10.3390/membranes12100985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/04/2022] [Accepted: 10/05/2022] [Indexed: 05/12/2023]
Abstract
Profiled ion-exchange membranes are promising for improving the parameters of reverse electrodialysis due to the reduction of pumping power and electrical resistance. The smooth commercial heterogeneous cation-exchange MK-40 and anion-exchange MA-41 membranes were chosen as the initial membranes. Profiled membranes with three different types of surface profiles were obtained by hot pressing the initial membranes. The bilayer membranes were made on the basis of single-layer profiled membranes by casting MF-4SK film on the profiled surfaces. The diffusion permeability of all types of single-layer and bilayer profiled membranes was higher than of the initial ones due to the appearance of large defects on their surface during pressing. The conductivity of the profiled membrane was lower in the diluted solution and higher in the concentrated solution than of the initial one for all samples except for the bilayer anion-exchange membrane. The conductivity of that sample was lower than that of the initial anion-exchange MA-41 membrane over the entire range of studied concentrations. The counter-ion transport numbers for all studied membranes were calculated based on the concentration dependences of conductivity and diffusion permeability of the membrane by the microheterogeneous model. The selectivity of single layer and bilayer profiled membranes became lower after their profiling due to the increase of the solution phases of membranes. The asymmetry of the current-voltage curves for all single-layer and bilayer profiled membranes was found. The application of the single layer and bilayer profiled membranes in reverse electrodialysis did not lead to an increase in power density.
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21
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Zhang Q, Su Y, Shi Z, Yang X, Sun J. Artificial Interphase Layer for Stabilized Zn Anodes: Progress and Prospects. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2203583. [PMID: 35996805 DOI: 10.1002/smll.202203583] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/23/2022] [Indexed: 06/15/2023]
Abstract
The burgeoning Li-ion battery is regarded as a powerful energy storage system by virtue of its high energy density. However, inescapable issues concerning safety and cost aspects retard its prospect in certain application scenarios. Accordingly, strenuous efforts have been devoted to the development of the emerging aqueous Zn-ion battery (AZIB) as an alternative to inflammable organic batteries. In particular, the instability from the anode side severely impedes the commercialization of AZIB. Constructing an artificial interphase layer (AIL) has been widely employed as an effective strategy to stabilize the Zn anode. This review specializes in the state-of-the-art of AIL design for Zn anode protection, encompassing the preparation methods, mechanism investigations, and device performances based on the classification of functional materials. To begin with, the origins of Zn instability are interpreted from the perspective of electrical field, mass transfer, and nucleation process, followed by a comprehensive summary with respect to functions of AIL and its designing criteria. In the end, current challenges and future outlooks based upon theoretical and experimental considerations are included.
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Affiliation(s)
- Qihui Zhang
- College of Energy, Soochow Institute for Energy and Materials Innovations, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou, 215006, China
| | - Yiwen Su
- College of Energy, Soochow Institute for Energy and Materials Innovations, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou, 215006, China
| | - Zixiong Shi
- College of Energy, Soochow Institute for Energy and Materials Innovations, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou, 215006, China
| | - Xianzhong Yang
- College of Energy, Soochow Institute for Energy and Materials Innovations, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou, 215006, China
| | - Jingyu Sun
- College of Energy, Soochow Institute for Energy and Materials Innovations, Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou, 215006, China
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22
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Loza NV, Taran KA, Kutenko KA. Preparation and Investigation of Anion Exchange Membranes Modified with Sulfonated Polyaniline. MEMBRANES AND MEMBRANE TECHNOLOGIES 2022. [DOI: 10.1134/s2517751622050079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Butylskii DY, Troitskiy VA, Skudarnova AS, Sharafan MV. Scaling on Surface of MA-41P Anion-Exchange Membrane in Concentration Chamber of Electrodialyzer during Processing Dilute Stratal Water Imitates. MEMBRANES AND MEMBRANE TECHNOLOGIES 2022. [DOI: 10.1134/s2517751622050031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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24
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Nguyen DT, Pham VS. Ions transport in electromembrane desalination: A numerical modeling for the return flow ion-concentration-polarization desalination system. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Electroconvective instability and shocks in complex geometries. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2022.101604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Seo M, Park S, Ryu J, Kim SJ. Adhesive lift method for patterning arbitrary-shaped thin ion-selective films in micro/nanofluidic device. LAB ON A CHIP 2022; 22:1723-1735. [PMID: 35373806 DOI: 10.1039/d2lc00185c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Micro/nanofluidic platforms with nanoporous films have been utilized as research tools for studying electrokinetic phenomena occurring not only in macro-scale systems such as electro-desalination but also in micro-scale systems such as bio-molecular preconcentrators. However, due to the limitations of fabrication techniques, studies with nanoporous films are mainly limited to vary the physicochemical properties of the films such as surface charge and pore size, despite the enormous effect of the membrane morphology on the phenomena that is to be expected. Therefore, we propose an economic and feasible nanofabrication method called the "adhesive lift method" for patterning thin arbitrarily-shaped nanoporous film to integrate it into micro/nanofluidic platforms. The conformal patterning of the nanoporous films (Nafion or poly(3,4-ethylenedioxythiophene)polystyrene sulfonate (PEDOT:PSS) in this work) was accomplished with spin coating, oxygen plasma treatment and the "adhesive lift technique". Using the fabricated platforms, the initiation of ion concentration polarization along the film with various shapes was demonstrated. In particular, various electrokinetic characteristics of overlimiting conductance depending on the length scale of the microchannels were successfully demonstrated. Therefore, the presented adhesive lift method would provide platforms which can nearly mimic practical macro-scale fluidic systems so that the method would be very useful for studying various electrokinetic phenomena inside it.
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Affiliation(s)
- Myungjin Seo
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Sungmin Park
- Creative Research Center for Brain Science, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Junghwan Ryu
- Department of Forest Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Sung Jae Kim
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea.
- SOFT Foundry Institute, Seoul National University, Seoul 08826, Republic of Korea
- Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea
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27
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Zhang Y, Zhang YM, Luo K, Yi HL, Wu J. Electroconvective instability near an ion-selective surface: A mesoscopic lattice Boltzmann study. Phys Rev E 2022; 105:055108. [PMID: 35706206 DOI: 10.1103/physreve.105.055108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 05/10/2022] [Indexed: 06/15/2023]
Abstract
Direct numerical simulations of electroconvection instability near an ion-selective surface are conducted using a mesoscopic lattice Boltzmann method (LBM). An electrohydrodynamic model of ion transport and fluid flow is presented. We numerically solve the Poisson-Nernst-Planck equations for the electric field and the Navier-Stokes equations for the flow field. The results cover Ohmic, limiting, and overlimiting current regimes, and they are in good agreement with the asymptotic analytical solution for the relationship between current and voltage. The influences of different ion transport mechanisms on the voltage-current relationship are discussed. The results reveal that the electroconvection mechanism is as important as other ion transport mechanisms in electrohydrodynamic flow. By comparing the contribution of different regions in the numerical domain, we find that the flow in the extended space charge layer is dominated by electroconvection. We also study the influences of multiple driving parameters, and the electrohydrodynamic coupling constant plays a dominant role in triggering convective instability. The flow pattern and ion concentration distribution are described in detail. Moreover, the route of flow from steady state to periodic oscillation and then to chaos is discussed.
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Affiliation(s)
- Yu Zhang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin 150001, People's Republic of China
| | - Yi-Mo Zhang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin 150001, People's Republic of China
| | - Kang Luo
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin 150001, People's Republic of China
| | - Hong-Liang Yi
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
- Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin 150001, People's Republic of China
| | - Jian Wu
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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28
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Huo P, Xu B, Gu Z, Su M, Rubinstein SM, Deng D. Observation of Remote Electroconvection and Inert-Cation Concentration Valley within Supporting Electrolytes in a Microfluidic-Based Electrochemical Device. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2108037. [PMID: 35257493 DOI: 10.1002/smll.202108037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/18/2022] [Indexed: 06/14/2023]
Abstract
The electrochemical system is playing an increasingly important role in the advanced technology development for drinkable water and energy storage. While the binary electrolyte has been widely studied, such as the associated intriguing interfacial instabilities, multi-component electrolyte is by far less known. Here, based on the classic Cu|CuSO4 |Cu electrochemical system, the effect of supporting electrolyte is systematically investigated by highlighting the inert cations. In an annulus microfluidic device, the suppression of a previously known electro-osmotic instability and the emergence of an array of the remote electroconvection along the azimuthal direction is found. A distinctive inert-cation concentration valley propagates radially outward at a speed limited by the electromigration velocity. Remarkably, the simultaneous visualization of spatiotemporal evolution demonstrates the correlation of the concentration valley and electroconvection at a microscopic level. The underlying physical mechanism of their correlation is discussed, and the scaling analysis agrees with experiments. This work might inspire more future work on the multi-component electrolyte, such as for the suppression of interfacial hydrodynamic instability and mitigation of dendrite growth, with the technological implications for water treatment and energy storage in batteries.
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Affiliation(s)
- Peng Huo
- Department of Aeronautics and Astronautics, Fudan University, Shanghai, 200433, China
| | - Bingrui Xu
- Department of Aeronautics and Astronautics, Fudan University, Shanghai, 200433, China
- Department of Basic Courses, Naval University of Engineering, Wuhan, Hubei, 430033, China
| | - Zhibo Gu
- Department of Aeronautics and Astronautics, Fudan University, Shanghai, 200433, China
| | - Mingzhuo Su
- Department of Aeronautics and Astronautics, Fudan University, Shanghai, 200433, China
| | - Shmuel M Rubinstein
- The Racah Institute of Physics, The Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel
| | - Daosheng Deng
- Department of Aeronautics and Astronautics, Fudan University, Shanghai, 200433, China
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29
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Apel PY, Velizarov S, Volkov AV, Eliseeva TV, Nikonenko VV, Parshina AV, Pismenskaya ND, Popov KI, Yaroslavtsev AB. Fouling and Membrane Degradation in Electromembrane and Baromembrane Processes. MEMBRANES AND MEMBRANE TECHNOLOGIES 2022. [DOI: 10.1134/s2517751622020032] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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30
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Two mechanisms of H+/OH− ion generation in anion-exchange membrane systems with polybasic acid salt solutions. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120449] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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31
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Rybalkina OA, Moroz IA, Gorobchenko AD, Pismenskaya ND, Nikonenko VV. Development of Electroconvection at the Undulate Surface of an Anion-Exchange Membrane in Sodium Chloride and Sodium Hydrogen Tartrate Solutions. MEMBRANES AND MEMBRANE TECHNOLOGIES 2022. [DOI: 10.1134/s2517751622010061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Tsygurina KA, Kirichenko EV, Kirichenko KA. Chronopotentiograms of MK-40 Cation Exchange Membrane Layer-by-Layer Modified with Polyallylamine and Sodium Polystyrene Sulfonate. MEMBRANES AND MEMBRANE TECHNOLOGIES 2022. [DOI: 10.1134/s2517751622010085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Assessment of Graphical Methods for Determination of the Limiting Current Density in Complex Electrodialysis-Feed Solutions. MEMBRANES 2022; 12:membranes12020241. [PMID: 35207162 PMCID: PMC8875246 DOI: 10.3390/membranes12020241] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/09/2022] [Accepted: 02/14/2022] [Indexed: 12/10/2022]
Abstract
Electrodialysis (ED) is a promising technology suitable for nutrient recovery from a wide variety of liquid waste streams. For optimal operating conditions, the limiting current density (LCD) has to be determined separately for each treated feed and ED equipment. LCD is most frequently assessed in the NaCl solutions. In this paper, five graphical methods available in literature were reviewed for LCD determination in a series of five feed solutions with different levels of complexity in ion and matrix composition. Wastewater from microbial fermentation was included among the feed solutions, containing charged and uncharged particles. The experiments, running in the batch ED with an online conductivity, temperature, and pH monitoring, were conducted to obtain data for the comparison of various LCD determination methods. The results revealed complements and divergences between the applied LCD methods with increasing feed concentrations and composition complexity. The Cowan and Brown method had the most consistent results for all of the feed solutions. Online conductivity monitoring was linearly correlated with the decreasing ion concentration in the feed solution and corresponding LCD. Therefore, the results obtained in this study can be applied as a base for the automatized dynamic control of the operating current density–voltage in the batch ED. Conductivity alone should not be used for the ED control since LCD depends on the ion exchange membranes, feed flow, temperature and concentration, ionic species, their concentration ratios, and uncharged particles of the feed solution.
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Titorova V, Moroz I, Mareev S, Pismenskaya N, Sabbatovskii K, Wang Y, Xu T, Nikonenko V. How bulk and surface properties of sulfonated cation-exchange membranes response to their exposure to electric current during electrodialysis of a Ca2+ containing solution. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2021.120149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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A critical analysis on ion transport of organic acid mixture through an anion-exchange membrane during electrodialysis. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2021.11.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Dependence of Electrochemical Properties of MK-40 Heterogeneous Membrane on Number of Adsorbed Layers of Polymers. MEMBRANES 2022; 12:membranes12020145. [PMID: 35207067 PMCID: PMC8879379 DOI: 10.3390/membranes12020145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/21/2022] [Accepted: 01/23/2022] [Indexed: 11/16/2022]
Abstract
The creation of monovalent selective ion exchange membranes benefits the desalination of surface waters by removing interfering monovalent ions while preserving polyvalent ionic nutrients. Studies of a promising method of layer-by-layer adsorption of polymers for the creation of monovalent selective coatings note a significant effect of the number of formed layers and of the nature of the external layer on the properties of the resulting membranes. This article reports the changes in properties of layer-by-layer coated heterogeneous membranes occurring at increasing numbers of layers that are attributed to the supposed intermixing of polymers between the layers, namely dependence of limiting current densities determined from i-V curve, enhanced electroconvection that was attributed to the appearing electrical heterogeneity of the surface, and the decreasing monovalent selectivity in electrodialysis of mixed NaCl + CaCl2 solution (from 1.33 to about 1) between the samples with five and six to eight layers of polymers.
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Modelling of the Electrical Membrane Potential for Concentration Polarization Conditions. ENTROPY 2022; 24:e24010138. [PMID: 35052163 PMCID: PMC8774907 DOI: 10.3390/e24010138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 12/29/2021] [Accepted: 01/07/2022] [Indexed: 12/07/2022]
Abstract
Based on Kedem–Katchalsky formalism, the model equation of the membrane potential (Δψs) generated in a membrane system was derived for the conditions of concentration polarization. In this system, a horizontally oriented electro-neutral biomembrane separates solutions of the same electrolytes at different concentrations. The consequence of concentration polarization is the creation, on both sides of the membrane, of concentration boundary layers. The basic equation of this model includes the unknown ratio of solution concentrations (Ci/Ce) at the membrane/concentration boundary layers. We present the calculation procedure (Ci/Ce) based on novel equations derived in the paper containing the transport parameters of the membrane (Lp, σ, and ω), solutions (ρ, ν), concentration boundary layer thicknesses (δl, δh), concentration Raileigh number (RC), concentration polarization factor (ζs), volume flux (Jv), mechanical pressure difference (ΔP), and ratio of known solution concentrations (Ch/Cl). From the resulting equation, Δψs was calculated for various combinations of the solution concentration ratio (Ch/Cl), the Rayleigh concentration number (RC), the concentration polarization coefficient (ζs), and the hydrostatic pressure difference (ΔP). Calculations were performed for a case where an aqueous NaCl solution with a fixed concentration of 1 mol m−3 (Cl) was on one side of the membrane and on the other side an aqueous NaCl solution with a concentration between 1 and 15 mol m−3 (Ch). It is shown that (Δψs) depends on the value of one of the factors (i.e., ΔP, Ch/Cl, RC and ζs) at a fixed value of the other three.
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Amiroudine S, Demekhin EA, Shelistov VS, Ganchenko GS. Electric-permittivity-based instability of two dielectric miscible liquids under DC field. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2022; 45:1. [PMID: 34978626 DOI: 10.1140/epje/s10189-021-00157-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 12/17/2021] [Indexed: 06/14/2023]
Abstract
This paper considers the mixing of two dielectric miscible viscous liquids with different electric permittivities bounded by solid walls in an external electric field normal to the interface of the liquids. The mutual diffusion of these two liquids leads to the formation of an unsteady self-similar 1D diffusion layer. This layer is found to be unstable to the perturbations of the interface. A special sophisticated mathematical approach in self-similar variables is developed to estimate its stability. The results of a linear stability theory are verified by direct numerical simulations of the full nonlinear problem. A mixing efficiency based on the separation amplitude and an optimal electric field strength to achieve the fastest mixing are proposed in the present study.
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Affiliation(s)
- S Amiroudine
- Institute of Mechanics and Engineering (I2M) CNRS, University of Bordeaux, 33400, Talence, France.
| | - E A Demekhin
- Department of Mathematics and Computer Science, Financial University, Krasnodar, Russian Federation, 350051
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, Krasnodar, Russian Federation, 350051
- Laboratory of General Aeromechanics, Institute of Mechanics, Moscow State University, Moscow, Russian Federation, 119192
| | - V S Shelistov
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, Krasnodar, Russian Federation, 350051
| | - G S Ganchenko
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, Krasnodar, Russian Federation, 350051
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Stockmeier F, Schatz M, Habermann M, Linkhorst J, Mani A, Wessling M. Direct 3D observation and unraveling of electroconvection phenomena during concentration polarization at ion-exchange membranes. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119846] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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40
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Uzdenova A, Urtenov M. Mathematical Modeling of the Phenomenon of Space-Charge Breakdown in the Galvanostatic Mode in the Section of the Electromembrane Desalination Channel. MEMBRANES 2021; 11:membranes11110873. [PMID: 34832102 PMCID: PMC8624947 DOI: 10.3390/membranes11110873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 11/08/2021] [Accepted: 11/11/2021] [Indexed: 11/28/2022]
Abstract
One of the ways to increase the efficiency of the desalination process in membrane systems is to use intensive current modes. Recently, the phenomenon of space-charge breakdown was theoretically described for desalination under intensive current modes. The space-charge breakdown is a decrease in the magnitude and size of the extended space charge regions (SCRs) of opposite signs, formed at the cation- and anion-exchange membranes in the desalination channel, when they approach each other. Therefore, this phenomenon negatively affects the intensity of electroconvection and the efficiency of mass transfer in membrane systems. We report the results of the first theoretical analysis of the space-charge breakdown in the galvanostatic electric mode, which is generally used in the research and operation of membrane systems. For this purpose, a one-dimensional model of the ion transfer of the electrolyte solution in the section of the desalination channel at the direct current is developed. The regularities of changes in the extended SCRs in the galvanostatic mode are determined. A relation is obtained for the onset time of the space-charge breakdown, which makes it possible to determine the parameters of the effective operation of the membrane system.
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Affiliation(s)
- Aminat Uzdenova
- Department of Computer Science and Computational Mathematics, Umar Aliev Karachai-Cherkess State University, 369202 Karachaevsk, Russia
- Correspondence:
| | - Makhamet Urtenov
- Department of Applied Mathematics, Kuban State University, 350040 Krasnodar, Russia;
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Pismenskaya N, Bdiri M, Sarapulova V, Kozmai A, Fouilloux J, Baklouti L, Larchet C, Renard E, Dammak L. A Review on Ion-Exchange Membranes Fouling during Electrodialysis Process in Food Industry, Part 2: Influence on Transport Properties and Electrochemical Characteristics, Cleaning and Its Consequences. MEMBRANES 2021; 11:membranes11110811. [PMID: 34832040 PMCID: PMC8623251 DOI: 10.3390/membranes11110811] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 10/19/2021] [Accepted: 10/19/2021] [Indexed: 12/17/2022]
Abstract
Ion-exchange membranes (IEMs) are increasingly used in dialysis and electrodialysis processes for the extraction, fractionation and concentration of valuable components, as well as reagent-free control of liquid media pH in the food industry. Fouling of IEMs is specific compared to that observed in the case of reverse or direct osmosis, ultrafiltration, microfiltration, and other membrane processes. This specificity is determined by the high concentration of fixed groups in IEMs, as well as by the phenomena inherent only in electromembrane processes, i.e., induced by an electric field. This review analyzes modern scientific publications on the effect of foulants (mainly typical for the dairy, wine and fruit juice industries) on the structural, transport, mass transfer, and electrochemical characteristics of cation-exchange and anion-exchange membranes. The relationship between the nature of the foulant and the structure, physicochemical, transport properties and behavior of ion-exchange membranes in an electric field is analyzed using experimental data (ion exchange capacity, water content, conductivity, diffusion permeability, limiting current density, water splitting, electroconvection, etc.) and modern mathematical models. The implications of traditional chemical cleaning are taken into account in this analysis and modern non-destructive membrane cleaning methods are discussed. Finally, challenges for the near future were identified.
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Affiliation(s)
- Natalia Pismenskaya
- Department of Physical Chemistry, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia; (N.P.); (V.S.); (A.K.)
| | - Myriam Bdiri
- Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France; (M.B.); (J.F.); (C.L.); (E.R.)
| | - Veronika Sarapulova
- Department of Physical Chemistry, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia; (N.P.); (V.S.); (A.K.)
| | - Anton Kozmai
- Department of Physical Chemistry, Kuban State University, 149 Stavropolskaya Str., 350040 Krasnodar, Russia; (N.P.); (V.S.); (A.K.)
| | - Julie Fouilloux
- Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France; (M.B.); (J.F.); (C.L.); (E.R.)
| | - Lassaad Baklouti
- Department of Chemistry, College of Sciences and Arts at Al Rass, Qassim University, Ar Rass 51921, Saudi Arabia;
| | - Christian Larchet
- Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France; (M.B.); (J.F.); (C.L.); (E.R.)
| | - Estelle Renard
- Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France; (M.B.); (J.F.); (C.L.); (E.R.)
| | - Lasâad Dammak
- Institut de Chimie et des Matériaux Paris-Est (ICMPE), Université Paris-Est Créteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, 94320 Thiais, France; (M.B.); (J.F.); (C.L.); (E.R.)
- Correspondence: ; Tel.: +33-145171786
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Butylskii DY, Troitskiy VA, Skudarnova AS, Sharafan MV, Pismenskaya ND. Stability of Properties of a Modified Anion-Exchange Membrane Obtained by Treating the Surface of a Commercial Sample with Bifunctional Polymer Containing Quaternary Amino Groups. MEMBRANES AND MEMBRANE TECHNOLOGIES 2021. [DOI: 10.1134/s2517751621050036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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Gil VV, Porozhnyy MV, Rybalkina OA, Sabbatovskiy KG, Pismenskaya ND. Influence of Titanium Dioxide Particles Percentage in Modifying Layer on Surface Properties and Current-Voltage Characteristics of Composite Cation-Exchange Membranes. MEMBRANES AND MEMBRANE TECHNOLOGIES 2021. [DOI: 10.1134/s2517751621050061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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44
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Lee D, Choi D, Park H, Lee H, Kim SJ. Electroconvective circulating flows by asymmetric Coulombic force distribution in multiscale porous membrane. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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45
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Space-Charge breakdown phenomenon and spatio-temporal ion concentration and fluid flow patterns in overlimiting current electrodialysis. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119583] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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46
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Schiffbauer J, Ganchenko G, Nikitin N, Alekseev M, Demekhin E. Novel electroosmotic micromixer configuration based on ion-selective microsphere. Electrophoresis 2021; 42:2511-2518. [PMID: 34553795 DOI: 10.1002/elps.202100040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 06/18/2021] [Accepted: 09/11/2021] [Indexed: 11/07/2022]
Abstract
In this paper, a micromixer of a new configuration is presented, consisting of a spherical chamber in the center of which an ion-selective microsphere is placed. Stratified liquid is introduced through the chamber via inlet and outlet holes under an external pressure gradient and an external electric field is directed in such a way that the resulting electroosmotic flow is directed against the pressure-driven flow, resulting in mixing. The investigation is carried out by direct numerical simulation on a super-computer. Optimal values of the applied electric field are determined to yield strong mixing. Above this optimal mixing regime, a number of instabilities and bifurcations are realized, which qualitatively coincide with those occurring during electrophoresis of an ion-selective microgranule. As shown by our calculation, these instabilities do not lead to an enhanced mixing. The resulting electroconvective vortices remain confined near the surface of the microgranule, and do not sufficiently perturb the stratified fluid flow further from the granule. On the other hand, another type of instability caused by the salt concentration gradient can generate sufficiently strong oscillations to enhance mixing. However, this only occurs when the external electric field is sufficiently high that the electroosmotic flow is comparable to the pressure-driven flow. This ultimately leads to creation of reverse flows of the liquid and cessation of the device operation. Thus, it was shown that the best mixing occurs in the absence of electrokinetic instability. Based on the data obtained, it is possible to select the necessary geometric characteristics of the micromixer to achieve the optimal mixing mode for a given set of liquids, which may be ten times more effective than passive mixers at the same flow rates. A comparison with the experimental data of the other authors confirms the effectiveness of this device and its other capabilities. Furthermore, the basic device design can be operated in other modes, for example, an electrohydrodynamic pump, a streaming current generator, or even a micro-reactor, depending on the system parameters and choice of an ion-selective granule.
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Affiliation(s)
- Jarrod Schiffbauer
- Department of Physical and Environmental Sciences, Colorado Mesa University, Grand Junction, CO, USA
| | - Georgy Ganchenko
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, Krasnodar, Russia
| | - Nikolay Nikitin
- Laboratory of General Aeromechanics, Institute of Mechanics, Moscow State University, Moscow, Russia
| | | | - Evgeny Demekhin
- Laboratory of Micro- and Nanoscale Electro- and Hydrodynamics, Financial University, Krasnodar, Russia.,Laboratory of General Aeromechanics, Institute of Mechanics, Moscow State University, Moscow, Russia.,Department of Mathematics and Computer Science, Financial University, Krasnodar, Russia
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47
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Modelling of transport properties of perfluorinated one- and bilayer membranes modified by polyaniline decorated clay nanotubes. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138768] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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48
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Guan Y, Brunton SL, Novosselov I. Sparse nonlinear models of chaotic electroconvection. ROYAL SOCIETY OPEN SCIENCE 2021; 8:202367. [PMID: 34430040 PMCID: PMC8355675 DOI: 10.1098/rsos.202367] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 07/12/2021] [Indexed: 06/13/2023]
Abstract
Convection is a fundamental fluid transport phenomenon, where the large-scale motion of a fluid is driven, for example, by a thermal gradient or an electric potential. Modelling convection has given rise to the development of chaos theory and the reduced-order modelling of multiphysics systems; however, these models have been limited to relatively simple thermal convection phenomena. In this work, we develop a reduced-order model for chaotic electroconvection at high electric Rayleigh number. The chaos in this system is related to the standard Lorenz model obtained from Rayleigh-Benard convection, although our system is driven by a more complex three-way coupling between the fluid, the charge density, and the electric field. Coherent structures are extracted from temporally and spatially resolved charge density fields via proper orthogonal decomposition (POD). A nonlinear model is then developed for the chaotic time evolution of these coherent structures using the sparse identification of nonlinear dynamics (SINDy) algorithm, constrained to preserve the symmetries observed in the original system. The resulting model exhibits the dominant chaotic dynamics of the original high-dimensional system, capturing the essential nonlinear interactions with a simple reduced-order model.
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Affiliation(s)
- Yifei Guan
- Department of Mechanical Engineering, Rice University, Houston, TX, 77005, USA
| | - Steven L. Brunton
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
| | - Igor Novosselov
- Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
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Manikandan D, Nandigana VVR. Overlimiting current near a nanochannel a new insight using molecular dynamics simulations. Sci Rep 2021; 11:15216. [PMID: 34312433 PMCID: PMC8313724 DOI: 10.1038/s41598-021-94477-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 07/09/2021] [Indexed: 11/09/2022] Open
Abstract
In this paper, we report for the first time overlimiting current near a nanochannel using all-atom molecular dynamics (MD) simulations. Here, the simulated system consists of a silicon nitride nanochannel integrated with two reservoirs. The reservoirs are filled with [Formula: see text] potassium chloride (KCl) solution. A total of [Formula: see text] million atoms are simulated with a total simulation time of [Formula: see text] over [Formula: see text] 30000 CPU hours using 128 core processors (Intel(R) E5-2670 2.6 GHz Processor). The origin of overlimiting current is found to be due to an increase in chloride ([Formula: see text]) ion concentration inside the nanochannel leading to an increase in ionic conductivity. Such effects are seen due to charge redistribution and focusing of the electric field near the interface of the nanochannel and source reservoir. Also, from the MD simulations, we observe that the earlier theoretical and experimental postulations of strong convective vortices resulting in overlimiting current are not the true origin for overlimiting current. Our study may open up new theories for the mechanism of overlimiting current near the nanochannel interconnect devices.
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Affiliation(s)
- D Manikandan
- Fluid Systems Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Vishal V R Nandigana
- Fluid Systems Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India.
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50
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Investigation of ion-exchange membranes by means of chronopotentiometry: A comprehensive review on this highly informative and multipurpose technique. Adv Colloid Interface Sci 2021; 293:102439. [PMID: 34058435 DOI: 10.1016/j.cis.2021.102439] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 11/21/2022]
Abstract
Electrodialysis is mostly used for drinking water production but it has gained applicability in different new fields in recent decades. Membrane characteristics and ion transport properties strongly influence the efficiency of electrodialysis and must be evaluated to avoid an intense energy consumption and ensure long membrane times of usage. To this aim, conducting studies on ion transport across membranes is essential. Several dynamic characterization methods can be employed, among which, chronopotentiometry has shown special relevance because it allows a direct access to the contribution of the potential in different states of the membrane/solution system. The present paper provides a critical review on the use of chronopotentiometry to determine the main membrane transport properties and to evaluate mass transfer phenomena. Properties, such as limiting current density, electrical resistances, plateau length, transport number of counter-ions in the membrane, transition times, and apparent fraction of membrane conductive area have been intensively discussed in the literature and are presented in this review. Some of the phenomena evaluated using this technique are concentration polarization, gravitational convection, electroconvection, water dissociation, and fouling/scaling, all of them also shown herein. Mathematical and experimental studies were considered. New trends in chronopotentiometric studies should include ion-exchange membranes that have been recently developed (presenting anti-fouling, anti-microbial, and monovalent-selective properties) and a deeper discussion on the behaviour of complex solutions that have been often treated by electrodialysis, such as municipal wastewaters. New mathematical models, especially 3D ones, are also expected to be developed in the coming years.
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