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Membranes
Special Issues
Liquid Transport and Membrane Behavior at High Pressures
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Liquid Transport and Membrane Behavior at High Pressures

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Chemistry".

Deadline for manuscript submissions: closed (15 May 2022) | Viewed by 4992

Special Issue Editors

Dr. Anton Belogorlov

E-Mail Website1 Website2
Guest Editor
1. Molecular Physics Department, National Research Nuclear University MEPhI, Kashirskoe sh. 31, 115409 Moscow, Russia
2. Polymeric Membranes Laboratory, A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospekt, 29, 119991 Moscow, Russia
Interests: materials characterization; nanomaterials; nanostructured materials; polymeric membranes; percolation
Dr. Alexey V. Volkov

E-Mail Website
Guest Editor
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, Russia
Interests: membrane design; membrane fabrication; membrane-based separation processes; high-throughput techniques; industry oriented applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

A number of applications require the operation of the membrane under elevated pressure difference across the membrane, such as reverse osmosis of high salinity water, gas-liquid membrane contactors for the removal of carbon dioxide (e.g. pre-combustion capture), and other gases. Besides, the utilization of various membrane processes for underground or sub-sea applications is currently exploring, which are also attributed to the selective mass transfer across the membrane at high pressures. Increasing the transmembrane pressure, on the one hand, should increase the flow but, on the other hand, it changes the structure and properties of the membrane due to deformation and possible conformational rearrangements (polymers). Both the properties of the mixtures to be separated and the interaction of the mixture components with the membrane material may also change. The proposed issue is focused on the coverage of works devoted to the study of novel high-pressure membrane applications, including the transport and structural properties of membranes at high pressures (up to 200 bar).

Dr. Anton Belogorlov
Dr. Alexey Volkov
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Membranes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • membrane material
  • transport properties
  • structural properties
  • high pressures
  • novel applications
  • selective mass-transfer
  • mixture–membrane interaction

Published Papers (2 papers)

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Research

19 pages, 5955 KiB  
Article
Dielectric Properties of Aqueous Electrolyte Solutions Confined in Silica Nanopore: Molecular Simulation vs. Continuum-Based Models
by Haochen Zhu and Bo Hu
Membranes 2022, 12(2), 220; https://doi.org/10.3390/membranes12020220 - 14 Feb 2022
Viewed by 2134
Abstract
Dielectric behavior of electrolyte aqueous solutions with various concentrations in a cylindrical nanopore of MCM 41 silica has been investigated. The effect of confinement is investigated by using isothermal-isosurface-isobaric statistical ensemble, which has proved to be an effective alternative to the Grand Canonical [...] Read more.
Dielectric behavior of electrolyte aqueous solutions with various concentrations in a cylindrical nanopore of MCM 41 silica has been investigated. The effect of confinement is investigated by using isothermal-isosurface-isobaric statistical ensemble, which has proved to be an effective alternative to the Grand Canonical Monte Carlo (GCMC) simulation method. Several single-salt solutions have been considered (e.g., NaCl, NaI, BaCl2, MgCl2) in order to investigate the effect of ion polarizability, ion size, and ion charge. The effect of salt concentration has also been addressed by considering NaCl solutions at different concentrations (i.e., 0.1 mol/L, 0.5 mol/L, and 1 mol/L). The motivation in performing this integrated set of simulations is to provide deep insight into the dielectric exclusion in NF theory that plays a significant role in separation processes. It was shown that the dielectric constant increased when ions were added to water inside the nanopore (with respect to the dielectric constant of confined pure water) unlike what was obtained in the bulk phase and this phenomenon was even more pronounced for electrolytes with divalent ions (MgCl2 and BaCl2). Therefore, our simulations indicate opposite effects of ions on the dielectric constant of free (bulk) and nanoconfined aqueous solutions. Full article
(This article belongs to the Special Issue Liquid Transport and Membrane Behavior at High Pressures)
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16 pages, 9026 KiB  
Article
Interphase Surface Stability in Liquid-Liquid Membrane Contactors Based on Track-Etched Membranes
by Stepan Bazhenov, Olga Kristavchuk, Margarita Kostyanaya, Anton Belogorlov, Ruslan Ashimov and Pavel Apel
Membranes 2021, 11(12), 949; https://doi.org/10.3390/membranes11120949 - 30 Nov 2021
Cited by 1 | Viewed by 2220
Abstract
A promising solution for the implementation of extraction processes is liquid–liquid membrane contactors. The transfer of the target component from one immiscible liquid to another is carried out inside membrane pores. For the first time, highly asymmetric track-etched membranes made of polyethylene terephthalate [...] Read more.
A promising solution for the implementation of extraction processes is liquid–liquid membrane contactors. The transfer of the target component from one immiscible liquid to another is carried out inside membrane pores. For the first time, highly asymmetric track-etched membranes made of polyethylene terephthalate (PET) of the same thickness but with different pore diameters (12.5–19 nm on one side and hundreds of nanometers on the other side) were studied in the liquid–liquid membrane contactor. For analysis of the liquid–liquid interface stability, two systems widely diverging in the interfacial tension value were used: water–pentanol and water–hexadecane. The interface stability was investigated depending on the following process parameters: the porous structure, the location of the asymmetric membrane in the contactor, the velocities of liquids, and the pressure drop between them. It was shown that the stability of the interface increases with decreasing pore size. Furthermore, it is preferable to supply the aqueous phase from the side of the asymmetric membrane with the larger pore size. The asymmetry of the porous structure of the membrane makes it possible to increase the range of pressure drop values between the phases by at least two times (from 5 to 10 kPa), which does not lead to mutual dispersion of the liquids. The liquid–liquid contactor based on the asymmetric track-etched membranes allows for the extraction of impurities from the organic phase into the aqueous phase by using a 1% solution of acetone in hexadecane as an example. Full article
(This article belongs to the Special Issue Liquid Transport and Membrane Behavior at High Pressures)
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