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Dependence of the Transport Properties of Perfluorinated Sulfonated Cation-Exchange Membranes on Ion-Exchange Capacity
Membranes and Membrane Technologies (Russia). 2020. Vol. 2. No. 4. P. 265–271.
The transport properties of ion-exchange membranes depend on many factors, primarily, on ion-exchange capacity and chemical composition. Therefore, the correlation of transport properties with a single particular parameter is generally not quite strict. In this study, the dependence of transport properties of several perfluorinated sulfonated cation-exchange membranes that differ in side chain length and fraction of fragments containing ether groups on ion-exchange capacity is analyzed. It is shown that, with a decrease in the ion-exchange capacity from 1.35 to 0.66 mg-equiv/g, the proton conductivity of membranes contacting water and their diffusion permeability with respect to a 0.1 M HCl solution decrease by two orders of magnitude. A decrease in relative humidity leads to the most significant decrease in the conductivity of membranes with a low ion-exchange capacity. Thus, at a relative humidity of 32%, the conductivity of the studied membranes decreases more than 600-fold with a decrease in ion-exchange capacity. In general, the oxygen permeability of membranes is characterized by a similar dependence. However, in this set of membranes, it varies as little as threefold.
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Shi R., Yu Y., Chibisov A., International Journal of Hydrogen Energy 2025 Vol. 107 P. 52–62
Cyanide containing wastewater can cause livestock death and reduce agricultural production and electrochemical reduction of cyanide (CNRR) is a promising way to eliminate its harm and turn waste into valuable products. However, the reaction mechanism and function of electrocatalysts for CNRR have not been fully understood yet. Herein we identify a two-dimensional (2D) conductive copper-organic ...
Added: October 11, 2026
Zhukov A., Chen F., Zeng Y. et al., Nanoscale 2026 Vol. 18 No. 36 P. 19223–19253
Colloidal semiconductor nanocrystals have emerged as promising materials for next-generation light-emitting diodes (LEDs) owing to their solution processability, tunable emission wavelengths, narrow emission linewidths, and high photoluminescence quantum yields. Among them, anisotropic nanocrystals, including one-dimensional nanorods (NRs) and two-dimensional nanoplatelets (NPLs), offer additional opportunities for controlling transition dipole moment orientation and light out-coupling efficiency. These ...
Added: October 2, 2026
Мальцева В. Е., Ananyev I., Milevskii N. et al., Molecular Systems Design and Engineering 2026 Vol. 11 No. 7 P. 691–704
The use of hydrophobic deep eutectic solvents (DESs) as extractants for metal ion separation is largely due to the ease of their preparation and the possibility of modifying them depending on the composition of the metal mixture to be separated. However, the most common approach to DES modification involves the replacement of the extractant, while ...
Added: October 2, 2026
Мальцева В. Е., Ananyev I., Golubev A. V. et al., Russian Journal of Inorganic Chemistry 2026 Vol. 71 P. 724–736
Two voluminous polymer silver(I) salts of perchlorinated dodecoborate clusters, {[(Me2CO)Ag(μ-Me2CO)2Ag(Me2CO)][μ-B12Cl12]}n (1) and {[DMFAg(μ-DMF)2AgDMF][μ-B12Cl12]}n (2) were synthesized. The 35Cl nuclear quadrupole resonance (NQR) spectroscopy supplemented with the X-ray diffraction data was applied for identifying and analyzing noncovalent interactions Cl···X in these salts. Whereas in X-ray diffraction, noncovalent interactions are associated with the presence of the shortened ...
Added: October 2, 2026
Мальцева В. Е., Rozhkov A., Ananyev I. et al., Inorganic Chemistry 2026 Vol. 65 No. 22 P. 12484–12496
Despite the well-established importance of chalcogen bonding in crystal engineering and supramolecular chemistry, experimental charge density data for TeII-centered chalcogen bonds have remained entirely absent, leaving the electronic nature of these interactions uncharacterized at the level of directly measured electron density. Here, we report the first high-resolution X-ray diffraction (HRXRD) study of TeII-centered chalcogen bonds, ...
Added: October 2, 2026
Ostovari Moghaddam A., Mehrabi-Kalajahi S., Solizoda I. A. et al., Metals and Materials International 2026 P. 1–9
Off-stoichiometric boron-doped chemically complex intermetallic alloys (CCIMAs) have recently emerged as a new avenue for overcoming the low temperature brittleness of ordered superlattices. However, their behavior at high temperatures remains unexplored. In this study, a novel (Ni39.6Co29.3Cr10Al15.8Ta3.3Nb2)98.5B1.5 CCIMA was prepared and its oxidation resistance over a wide temperature range (500 °C–950 °C) was studied. The ...
Added: October 1, 2026
Ilya Nifant’ev, Komarov P., Guzelia Sadrtdinova et al., Polymers 2024 Vol. 16 No. 5 Article 681
Silica-supported chromium oxide catalysts, also named Phillips chromium catalysts (PCCs), provide more than half of the world’s production of high- and medium-density polyethylenes. PCCs are usually prepared in the Cr(VI)/SiO2 form, which is subjected to reductive activation. It has been explicitly proven that CO reduces Cr(VI) to Cr(II) species that initiate ethylene polymerization; ethylene activates ...
Added: May 12, 2026
Manin A., Lysova A. A., Stenina I. et al., Membranes and Membrane Technologies 2025 Vol. 7 No. 4 P. 207–216
Abstract: Anion-exchange membranes based on cardo polybenzimidazole and zinc(II) ions with various molar ratios of metal ions (0, 0.05, 0.25, 0.50, and 1.00) were prepared by casting solutions of metal–polymer complexes. The introduction of zinc(II) ions into the structure of cardo polybenzimidazole is accompanied by the formation of a cross-linked polymer matrix due to the ...
Added: February 17, 2026
Lebedev M. D., Goncharenko A. A., Skvortsov I. A. et al., Russian Journal of Inorganic Chemistry 2024 Vol. 69 P. 472–478
This work describes the use of silica particles obtained by sol-gel method as a template for deposition of supramolecular complexes of melamine cyanurate. To obtain SiO2@melamine-cyanurate (SiO2@MCA) material, the method of covalent modification of silica surface by melamine molecules (SiO2-mel) was applied and the method of its further functionalization by hydrogen-bonded organic framework of melamine-cyanurate ...
Added: September 16, 2025
Golubenko D. V., Manin A. D., Wu L. et al., Desalination 2024 Vol. 573 Article 117178
The scientific community has shown great interest in the selectivity of anion-exchange membranes (AEMs), particularly regarding their ability to monovalent-ions selective transport. In this work, we have studied the selectivity of an original anion-exchange membrane and a layer-by-layer (LbL) surface-modified membrane in the electrodialysis (ED) desalination of sodium chloride and sodium sulfate mixture in a ...
Added: February 20, 2025
Golubenko D. V., Manin A., Yaroslavtsev A. B., Desalination 2022
Recently, the selectivity of ion-exchange membranes and its control have been the subject of numerous fundamental and applied studies. This paper reports an enhanced monovalent anion selectivity of hybrid membrane based on the FujiFilm® Type I anion-exchange membrane and in situ synthesized cerium phosphate (CeP) with a gradient distribution over the membrane thickness. The Cl/SO4-selectivity ...
Added: December 7, 2022
Starannikova L. E., Alentiev A.Yu., Nikiforov R. Y. et al., Polymer 2021 Vol. 212 Article 123271
Polymer of intrinsic microporosity (PIM-1) was prepared according to a new procedure – precipitation polycondensation in DMSO solution. The permeability coefficients were determined in the “as cast” and ethanol treated samples of this material. It was shown that permeability of the novel polymer is higher than that of PIM-1 samples prepared according to the traditional methods, while ...
Added: November 1, 2022
Stenina I. A., Yurova P., Novak L. et al., Colloid and Polymer Science 2021 Vol. 299 P. 719–728
Inorganic-organic composites based on the foil and standard RALEX (R) cation-exchange heterogeneous membranes (Mega a.s., Czech Republic) were prepared by in situ modification with sulfated zirconia (S-ZrO2). The composite membranes were characterized by SEM, TGA, X-ray diffraction, and FTIR spectroscopy. The effect of S-ZrO2 doping on membrane transport properties was studied using measurements of water ...
Added: June 15, 2021
Yaroslavtsev A. B., Стенина И., Golubenko D. V., Pure and Applied Chemistry 2020 Vol. 92 No. 7 P. 1147–1157
Ion exchange membranes are widely used in chemical power sources, including fuel cells, redox batteries, reverse electrodialysis devices and lithium-ion batteries. The general requirements for them are high ionic conductivity and selectivity of transport processes. Heterogeneous membranes are much cheaper but less selective due to the secondary porosity with large pore size. The composition of ...
Added: August 30, 2020
Yorov K. E., Kottsov S. Y., Baranchikov A. E. et al., Journal of Sol-Gel Science and Technology 2019 Vol. 92 No. 2 P. 304–318
A procedure for the chemical immobilization of a new ZnII–EuIII heterobimetallic complex in the SiO2 aerogel matrix has been developed. In this Zn–Eu complex, a peripheral non-luminescent Zn ion acts as a binder to a silica matrix and prevents direct interaction of rare-earth ions with OH− and NH− groups in the silica matrix, which would have a ...
Added: May 27, 2020
Yurova P., Aladysheva U. S., Stenina I. et al., Russian Journal of Electrochemistry 2019 Vol. 55 P. 1292–1298
Composite materials based on homogeneous perfluorinated cation exchange membranes MF-4SK and sulfonated zirconium oxide were obtained by in situ and casting methods and their transport properties and gas permeability were studied. With the introduction of sulfonated zirconia, the conductivity of in situ and casting membranes increases at room temperature by more than 1.5 and 4 ...
Added: November 13, 2019
Golubenko D. V., Yurova P., Караванова Ю. А. et al., Inorganic Materials 2017 Vol. 53 No. 10 P. 1053–1057
We have studied the effect of surface modification with acids and subsequent heat treatment on the properties of hydrous zirconia. It has been shown that surface modification with phosphate and sulfate groups makes it possible not only to control the phase composition of the heat-treated oxide but also to considerably suppress particle growth. We have ...
Added: November 13, 2019
Golubenko D. V., Pourcelly G., Yaroslavtsev A. B., Separation and Purification Technology 2018 Vol. 207 P. 329–335
In the present study the properties of novel cation-exchange membranes based on UV-oxidized polymethylpentene (PMP) with grafted sulfonated polystyrene are described. A correlation between the composition of the grafted copolymer (grafting degree, cross-linking degree) and transport properties (Na+-conductivity, permselectivity, diffusion permeability) of resulted membranes are discussed. It is shown that with increasing of grafting degree (GD) and lowering of ...
Added: January 10, 2019