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Comparative studies of the proton conductivity behavior during hydration of sulfonated perfluorinated and hydrocarbon proton exchange membranes
Ionics. 2025. Vol. 31. P. 1891–1907.
Ulyana M. Zavorotnaya, Gudkov Y., Ponomarev I., Lyskov N., Ryzhkin I., Vitaly V. Sinitsyn
Impedance spectroscopy was used to study proton conductivity changing of pre-dried sulfonated perfluorinated and hydrocarbon (polynaphtoleimide) membranes over time during their hydration. For this purpose, commercial perfluorinated membranes Nafion 212, Nafion 211, Gore 18 and hydrocarbon co-polynaphthoyleneimide (co-PNIS) membranes with different hydrophobicity blocks (ODAS/MDAC and ODAS/MDOT) synthesized in this work were used. It was found that that the proton conductivity steady state values of Gore 18 membrane were established faster in humidity atmosphere after its drying than for other membranes studied in this work. This membrane demonstrates also better characteristics with cyclic humidity changes from 35 % to 75 % (sorption) and from 75 % to 35 % (desorption), which actually simulates start operation of PEMFC after its storage at the normal conditions. It was found that Nafion type membranes possess more universal hydration characteristics PEMFC in whole investigated humidity values interval and reveal consistently both high proton transport values and proton conductivity recovery kinetics parameters from dry state. However, the proton conductivity highest level at RH > 75% is demonstrated by fluorine-free co-PNIS membranes, which is also associated with its higher hydration degree compared to perfluorinated analogues. Moreover, it has been observed that the hydrocarbon co-PNIS (ODAS/MDOT) membrane, with a large difference in the hydrophobicity degree between polymer blocks is characterized by both higher protonic conductivity and its recovery kinetics parameters compared to the hydrocarbon analogue co-PNIS (ODAS/MDAC). The effect of the hydrophobic block on proton transport in co-PNIS membrane is discussed.
Ponomarev A., Aleksandrov N., Plasma Physics Reports 2026 Vol. 52 No. 3 P. 367–378
An approximate method for calculating drift velocity and other kinetic coefficients of heavy ions
in a light gas is generalized to gaseous mixtures. Obtained equations are used to calculate the mobilities of
and ions, as well as rate constants for inelastic ion–molecule processes with these ions in helium with
small additions of O2 under an electric field. Calculated ...
Added: April 27, 2026
Domrin V. I., Malova H. V., V. Yu. Popov et al., Cosmic Research 2026 Vol. 64 No. 2 P. 238–252
During magnetospheric perturbations a relatively thin current sheet with thickness about several
proton gyroradii forms in the Earth’s magnetotail. In a framework of the kinetic model describing current
sheet thinning in the magnetotail, the processes of its formation are investigated depending on the normal
magnetic field magnitude which affects both the current sheet structure and particle dynamics within ...
Added: April 27, 2026
Tsareva O. O., Malova H. V., V. Yu. Popov et al., Plasma Physics Reports 2026 Vol. 52 No. 2 P. 179–185
The influence of asymmetry of plasma sources on the structure and spatial localization of a superthin
current sheet (STCS) supported by demagnetized electrons is studied using a self-consistent model. The
simulation takes into account the presence of a single plasma source in the northern hemisphere, which
makes the plasma flow asymmetric. It is demonstrated that the asymmetry of ...
Added: April 27, 2026
П.А.Беспалов, О.Н. Савина, Геомагнетизм и аэрономия 2025 Т. 65 № 5 С. 620–628
Several basic models of frequency dynamics in quasi-periodic VLF emissions with spectral form repetition
periods from 10 to 300 s are considered. In all cases, we are talking about manifestations of cyclotron instability
of electron radiation belts thet are well described within the framework of the plasma magnetospheric maser
theory based an the averaged self-consistent system of quasi-linear ...
Added: April 25, 2026
Bondarenko G.G., Fisher M. R., Kristya V. I., Bulletin of the Russian Academy of Sciences: Physics 2026 Vol. 90 No. 4 P. 572–576
A model of the cathode layer of a glow gas discharge with a thin dielectric film on a fraction of the
cathode’s working surface is formulated. It is shown that a glow discharge most rapidly transits to an arc discharge,
accompanied by a significant increase in discharge current density and a decrease in cathode voltage
drop, if the ...
Added: April 25, 2026
Krasnov L., Malikov D., Kiseleva M. et al., Journal of Medicinal Chemistry 2026 Vol. 69 No. 8 P. 8838–8851
In this work, we developed a straightforward data-driven approach to predict the cytotoxicity of metal complexes based entirely on their (metal + ligands) composition. To this end, we have manually curated MetalCytoToxDB─a comprehensive experimental database comprising 26,500 IC50 values for 7050 metal complexes against 754 cell lines from 1921 articles. Based on these, machine learning ...
Added: April 23, 2026
Novikov A., Inorganic Chemistry Communications 2026 Article 116670
The reaction of copper(I) phenylacetylide [PhC ≡ CCu]n with the 2-pyridylphosphines (tBu2PyP and Ph2PyP) offers a straightforward route to structurally diverse clusters. With tBu2PyP, a trinuclear cluster [Cu3(C ≡ CPh)3(tBu2PyP)3] featuring a Cu3 triangular was isolated. Surprisingly, the reaction of [PhC ≡ CCu]n with Ph2PyP yields two isomeric clusters [Cu4(C ≡ CPh)4(Ph2PyP)4] with tetrahedral or zigzag-arranged Cu4 cores. Upon prolonged storage in acetonitrile, the tetrahedral Cu4 cluster converts to ...
Added: April 22, 2026
Zadkov V., Plasmonics 2026 Vol. 21 P. 1503–1512
Plasmonic nanostructures typically exhibit shifts in their resonant wavelength in response to changes in the refractive index of the surrounding medium. This limits their applications in scenarios requiring stable optical resonances. Here we present a metallic-dielectric hybrid metasurface that exhibits stable multi-wavelength resonance even if the refractive index of its surrounding varies. To quantitatively evaluate the stability of ...
Added: April 22, 2026
Kopoleva E., Sergey A. Tsymbal, Kuchur O. et al., Drug Delivery and Translational Research 2026 P. 1–16
Multidrug resistance (MDR) remains one of the principal challenges in cancer chemotherapy, necessitating new strategies to restore drug efficacy. In this study we developed and characterize a redox-responsive nanoplatform based on trithiocyanuric acid and polyethylene glycol (TTCA-PEG NPs) as a potential tool to overcome MDR and provide a biocompatible delivery system for conventional antitumor drugs. ...
Added: April 20, 2026
Shchur L., Antonov D., Burovski E., International Journal of Bifurcation and Chaos in Applied Sciences and Engineering 2026 P. 1–9
We present a simple model that simulates the possible influence of one society on another. Specifically, two societies evolve deterministically according to the well-known Nowak-May spatial game with the addition of mutual influence through connections that reflect the current states of the societies. This may be related to the influence of a global information resource ...
Added: April 20, 2026
Qin X., Deng Y., Shchur L. et al., / Series arXiv "math". 2026. No. 2603.02962.
We perform a Monte Carlo analysis of the Ising model on many three-dimensional lattices. By means of finite-size scaling we obtain the critical points and determine the scaling dimensions. As expected, the critical exponents agree with the three-dimensional Ising universality class for all models. The irrelevant field, as revealed by the correction-to-scaling amplitudes, appears to ...
Added: April 20, 2026
Pilé I., Deng Y., Shchur L., / Series arXiv "math". 2026. No. 2604.10254.
We investigate the spatial overlap of successive spin configurations in Markov chain Monte Carlo simulations using the local Metropolis algorithm and the Svendsen-Wang and Wolff cluster algorithms. We examine the dynamics of these algorithms for two models in different universality classes: the Ising model and the Potts model with three components. The overlap of two ...
Added: April 20, 2026
Novikov A., Russian Journal of Organic Chemistry 2026 Vol. 62 Article 12
The dipolar [3+2]-cycloaddition reactions of 3-aroylpyrrolo[2,1-c][1,4]benzothiazine-1,2,4-triones with diarylnitrones lead to the formation of benzo[b]isoxazolo[5',4':2,3]pyrrolo[1,2-d][1,4]thiazines. The reac- tion proceeds stereoselectively to form exclusively the (2aS*,3R*,5aS*) diastereomers. Density functional theory computations for the model reaction showed that the (2aS*,3R*,5aS*) diastereomers are both kinetically and thermodynamically preferred over the alternative (2aS*,3S*,5aS*) diastereomers. At room temperature in solution, the ...
Added: April 19, 2026
Makarov D. M., Kalikin N., Gurikov P. et al., Journal of Supercritical Fluids 2026 Vol. 235 Article 106979
Supercritical CO2 (scCO2 ) is an environmentally friendly solvent, but its low polarity limits the solubility of polar compounds. Cosolvents are commonly used to enhance solvation capability, yet comprehensive datadriven studies are scarce. We compiled the largest dataset to date — 4401 experimental solubility records with 22 cosolvents for 93 nonionic solutes, plus 4855 records ...
Added: April 19, 2026
Kalikin N., Брандышев П. Е., Budkov Y., Journal of Chemical Physics 2026 Vol. 164 Article 154904
This study presents a mean-field theory for zwitterionic polymer solutions confined within attractive slit-like nanopores. Building upon our prior model for self-coacervation [Budkov et al., Soft Matter 19, 3281–3289 (2023)], we demonstrate that strong electrostatic dipole–dipole correlations between monomeric units, coupled with attraction to pore walls, can induce capillary-driven liquid–liquid phase separation inside the pore—a ...
Added: April 18, 2026
Рыжкин М. И., Рыжкин И. А., Синицын В. В. et al., Письма в Журнал экспериментальной и теоретической физики 2025 Т. 122 № 1-2 С. 109–115
The frequency dependence of the proton conductivity of ice and water is theoretically investigated in a wide frequency range. The electric field of the inhomogeneous distribution of proton current carriers and their finite mass are taken into account. The first factor is responsible for the difference in the behavior of the transverse and longitudinal conductivities, ...
Added: January 17, 2026
Tarasova N., Bedarkova A., Animitsa I. et al., International Journal of Hydrogen Energy 2023 Vol. 48 No. 59 P. 22522–22530
Proton-conducting electrochemical devices such as protonic ceramic fuel cells and pro- tonic ceramic electrolysis cells play a major role in the creation of eco-friendly “green” energy systems. The most studies of proton-conducting materials for these devices are barium cerate zirconates. The layered perovskites are novel class of proton-conducting materials. In this paper, the possibility of ...
Added: December 18, 2025
Tarasova N., Abakumova E., Kuznetsova T. et al., Ceramics International 2024 Vol. 50 No. 20 P. 40445–40452
The search for novel functional ceramic materials with targeted properties is currently very important. Complex oxides with perovskite or perovskite-related structure are being considered for the production of electrochemical devices for the hydrogen energy ecosystem. Layered perovskites including based on BaLaInO4 are promising materials for proton-conducting electrolyte of solid oxide fuel cells. The idea of ...
Added: December 18, 2025
Zhigileva E. A., Enakieva Y. Y., Sinelshchikova A. A. et al., Dalton Transactions 2023 Vol. 52 No. 24 P. 8237–8246
Hydrogen-bonded organic frameworks (HOFs) possessing high crystallinity, simple synthetic procedure and easy regeneration provide high efficiency as multifunctional systems, including applications as proton conductors. Porphyrinylphosphonates having acidic moieties, which can form multiple hydrogen bonds, together with tunable physical–chemical properties of a macrocycle may significantly improve the proton conductivity of such materials. Herein, the synthesis, characterization ...
Added: January 21, 2025
Baldin E., Lyskov N., Vorobieva G. et al., Energies 2023 Vol. 16 No. 15 Article 5637
We report a study of nanophases in the La2O3–MO3 (M = Mo, W) systems, which are known to contain a variety of good oxygen-ion and proton conductors. Mechanically activated La2O3 + MO3 (M = Mo, W) mixtures and the final ceramics have been characterized by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) with Rietveld ...
Added: July 31, 2023
Рыжкин М. И., Рыжкин И. А., Кашин А. М. et al., Письма в Журнал экспериментальной и теоретической физики 2020 Т. 112 № 7-8(10) С. 531–538
The pressure dependence of the proton conductivity of water ice is studied theoretically. It is shown that the decrease in the hydrogen bond length leads to the decrease in the formation energy of ionic defects and to the increase in the formation energy of bond defects. As a result, the partial conductivity of ionic defects, ...
Added: October 31, 2022
Zavorotnaya U., Igor I. Ponomarev, Volkova Y. et al., Materials 2020 Vol. 22 No. 13 Article 5297
The sulfonated polynaphthoyleneimide polymer (co-PNIS70/30) was prepared by copolymerization of 4,4′-diaminodiphenyl ether-2,2′-disulfonic acid (ODAS) and 4,4’-methylenebisanthranilic acid (MDAC) with ODAS/MDAC molar ratio 0.7/0.3. High molecular weight co-PNIS70/30 polymers were synthesized either in phenol or in DMSO by catalytic polyheterocyclization in the presence of benzoic acid and triethylamine. The titration reveals the ion-exchange capacity of the polymer ...
Added: October 20, 2022
Yurova P., Yaroslavtsev A. B., Ashrafi A. et al., Reactive and Functional Polymers 2021 Vol. 165 Article 104959
Perfluorinated sulfonic acid (PFSA) polymer membranes are widely used as ion-conducting electrolytes in
energy-conversion devices. The development of novel hybrid materials containing inorganic dopants offers the
route towards optimization of the performance of the PFSA membranes. In this work, the effect of ultrasonic (US)
treatment of the PFSA solutions in the presence of SiO2 nanoparticles on the characteristics ...
Added: September 16, 2022
Enakieva Y., Zhigileva E., Fitch A. et al., Dalton Transactions 2021 Vol. 50 P. 6549–6560
The rational design of metal–organic frameworks (MOFs) is highly important for the development of new
proton conductors. Porphyrinylphosphonate-based MOFs, providing the directed tuning of physical and
chemical properties of materials through the modification of a macrocycle, are potentially high-conducting
systems. In this work the synthesis and characterization of novel anionic Zn-containing MOF based on
palladium(II) meso-tetrakis(3-(phosphonatophenyl))porphyrinate, IPCE-2Pd, are reported. ...
Added: October 19, 2021