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ТРАНСПОРТНЫЕ СВОЙСТВА АСИММЕТРИЧНЫХ ИОНООБМЕННЫХ МЕМБРАН НА ОСНОВЕ МК-40, МФ-4СК И ПОЛИАНИЛИНА
Мембраны и мембранные технологии. 2014. Т. 4. № 1. С. 26–30.
Asymmetric membrane materials based on MK-40 membranes modified with a thin layer of perfluorinated ion exchangers MF-4SK with embedded polyaniline were obtained. The diffusion characteristics of the obtained composites are investigated. An abnormal asymmetry of ion transport in a neutral medium was detected. The diffusion coefficients of individual cations for membranes with mixed cation composition were estimated. The conductivity of composites was investigated. The activation energies are estimated. It was shown that the maximum ionic conductivity is observed for membranes with a 2% polyaniline content, which is consistent with the theory of limited membrane pore elasticity.
Veretennikov A., Moscow Mathematical Journal 2024 Vol. 24 No. 1 P. 107–124
Second order recurrence are established for a d-dimensional diffusion with an additive Wiener process, with switching, and with one recurrent and one transient regime and constant switching intensities, under suitable conditions. As a corollary, the rate of convergence towards the invariant regime of order t^{−2} is claimed. The approach is based on embedded Markov chains ...
Added: July 16, 2026
Veretennikov A., Stochastics and Partial Differential Equations: Analysis and Computations 2022 Vol. 10 P. 1165–1179
Positive recurrence of a $d$-dimensional diffusion with an additive Wiener process, with switching and with one recurrent and one transient regimes and variable switching intensities is established under suitable conditions. The approach is based on embedded Markov chains. ...
Added: July 15, 2026
V.E. Antonov, Ceramics International 2025 Vol. 51 No. 18 P. 25160–25168
Diamonds with impurity-vacancy centers are an attractive material for microphotonics and can be used, for example, as single photon emitters. Detonation nanodiamonds (DNDs) with intrinsic single nitrogen-vacancy (NV) centers are cheap and suitable for mass production. This paper proposes a way to overcome the two main properties of the DNDs: the tendency to agglomeration and ...
Added: March 26, 2026
Fominykh N., Stegailov V., Journal of Chemical Physics 2025 Vol. 163 No. 11 Article 114704
First-principles modeling of exciton dynamics coupled with lattice vibrations is important for understanding exciton mobility, which is crucial for various applications. In order to shed light on such coupled exciton–lattice dynamics, in this paper, we use a restricted open-shell Kohn–Sham approach, which is a computationally efficient method for electronic structure calculations in the lowest excited ...
Added: September 16, 2025
Parshina A., Yelnikova A., Shimbareva V. et al., Journal of Chemometrics 2024 Vol. 38 No. 10 Article e3583
A growing interest in dental practice in intranasal anesthesia using tetracaine and oxymetazoline dictates the need for their simultaneous determination in combination drugs and human saliva. Potentiometric multisensory systems based on perfluorosulfonic acid membranes, including polyaniline-modified ones, were developed for these purposes. A change in the distribution of the sensor sensitivity to the related analytes ...
Added: October 1, 2024
Ivchenko N., Lebedev V., Vergeles S. S., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2024 Vol. 110 No. 1 Article 015102
Chaotic variations in flow speed up mixing of scalar fields via intensified stirring. This paper addresses the statistical properties of a passive scalar field mixing in a regular shear flow with random fluctuations against its background. We consider two-dimensional flow with shear component dominating over smooth fluctuations. Such flow is supposed to model passive scalar ...
Added: September 3, 2024
Khnkoian G. V., Nikolaev V. S., Stegailov V., Journal of Nuclear Materials 2024 Vol. 594 Article 155016
Microscopic description of solid Pb-O formation and dissolution in liquid lead coolant is important for the modelling of fast neutron reactors. For this purpose, in this work we develop interatomic potential models for lead melt with dissolved oxygen. Potentials fitting is based on \textit{ab initio} density functional theory (DFT) calculations and quantum molecular dynamics. Two ...
Added: April 18, 2024
Ivchenko N., Vergeles S. S., Журнал экспериментальной и теоретической физики 2023 Т. 163 № 5 С. 724–733
We study statistical properties of the passive scalar advection in a 2D flow that consist of a steady-state shear flow and a relatively weak smooth random component taking into account the effects of finite weak diffusion. The model is closely related to the dynamics of passive scalar transfer inside coherent vortices emerging as a result ...
Added: February 15, 2024
Privalov A., Vitaly V. Sinitsyn, Vogel M., The Journal of Physical Chemistry Letters 2023 Vol. 14 No. 30 P. 9335–9340
We use 1H and 17O NMR static field gradient diffusometry to measure self-diffusion coefficients of protons (DH) and oxygens (DO) in Nafion 212 with various hydration levels (λ = 4–18). For all samples and both nuclei, we obtain activation energies (Ea) of ≈0.19 eV. Analyzing the hydration-level dependence of DH and DO, we find DO/DH ≈ 1 at λ ≈ 18, resembling ...
Added: October 13, 2023
Darya Gurina, Ekaterina Odintsova, Krestyaninov M. A. et al., Journal of Molecular Liquids 2023 Vol. 390 No. A Article 122961
The paper presents a study of the behavior of room-temperature ionic liquids with different alkyl chain lengths and anion types in slit negatively charged carbon nanopores of various widths (1÷15 nm) using all-atom molecular dynamics simulations. The structure of the confined ionic liquids is investigated using number, mass, and charge density profiles and radial distribution ...
Added: August 31, 2023
Manin A., Golubenko D., Novikova S. et al., Membranes 2023 Vol. 13 No. 7 Article 624
The possibility of targeted change of the properties of ion exchange membranes by incorporation
of various nanoparticles into the membranes is attracting the attention of many research
groups. Here we studied for the first time the influence of cerium phosphate nanoparticles on
the physicochemical and transport properties of commercial anion exchange membranes based
on quaternary ammonium-functionalized polystyrenes, such as ...
Added: July 26, 2023
Antropov A., Stegailov V., Journal of Nuclear Materials 2023 Vol. 573 Article 154123
The influence of helium pressure on the mechanisms of diffusion of the He-filled nanobubbles in fcc Al is investigated by the classical molecular dynamics. It is shown that at pressures <20 kbar gas suppresses self-diffusion, while the concentration of adatoms, rather than their mobility, plays a key role. However, as the pressure increases to values at which ...
Added: February 1, 2023
Irina Stenina, Safikanov D., Minakova Polina et al., Batteries 2022 Vol. 8 No. 12 Article 256
The effect of different nitrogen-doped carbon additives (carbon coating from polyaniline,
N-doped carbon nanotubes, and N-doped carbon nanoparticles) on electrochemical performance
of nanocomposites based on the olivine-type LiFePO4 was investigated. Prepared materials were
characterized by XRD, SEM, TGA-MS, CHNS-analysis, IR-, Raman, and impedance spectroscopies.
Polyaniline deposition on the LiFePO4 precursor with following annealing lead to the formation of
a LiFePO4/C ...
Added: November 28, 2022
Yaroslavtsev A. B., Novikova S., Voropaeva D. et al., Batteries 2022 Vol. 8 No. 10 Article 162
Polymer electrolyte based on Nafion-117 membranes in the Li+ form with intercalated
1,3-dioxolane-dimethoxyethane solvent mixtures (DOL-DME) has been obtained. The obtained electrolyte
Nafion-Li+-DOL-DME has been characterized by DSC analysis, IR- and impedance spectroscopy.
The solvent uptake of membrane in the DOL-DME mixture amounts to 1.9. Nafion-Li+-DOL-DME
is characterized by an ionic conductivity ~107 S cm1 at room temperature. The ...
Added: November 25, 2022
Parshina A., Yelnikova A., Titova T. et al., Polymers 2022 Vol. 14 No. 13 Article 2545
The degradation of sulfacetamide with the formation of sulfanilamide leads to a deterioration in the quality of pharmaceuticals. In this work, potentiometric sensors for the simultaneous determination of sulfanilamide, sulfacetamide and inorganic ions, and for assessing the degradation of pharmaceuticals were developed. A multisensory approach was used for this purpose. The sensor cross-sensitivity to related ...
Added: October 31, 2022