{"title":"Vapor–Liquid Equilibrium Measurement of Methanol–Chloroform–Tetrahydrofuran and Methanol–Chloroform–Tetrahydrofuran–Dimethyl Sulfoxide Mixtures at 101.32 kPa","authors":"V. I. Zhuchkov, V. M. Raeva, D. A. Ryzhkin","doi":"10.1134/S0036024424702509","DOIUrl":"10.1134/S0036024424702509","url":null,"abstract":"<p><b>Abstract</b>—The vapor–liquid equilibrium of methanol–chloroform–tetrahydrofuran mixtures of various compositions and methanol–chloroform–tetrahydrofuran–dimethyl sulfoxide mixtures with different dimethyl sulfoxide contents at 101.32 kPa were studied experimentally. A comparison of experimental and calculated values of the relative volatility of substances in four-component mixtures was carried out. The results of extractive distillation of ternary mixtures are predicted based on experimental data and calculated data obtained using the NRTL model.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"29 - 37"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Shielding and Electromagnetic Radiation-Absorbing Properties of Shugnite-Containing Materials","authors":"Yu. V. Samukhina, A. K. Buryak","doi":"10.1134/S0036024424702649","DOIUrl":"10.1134/S0036024424702649","url":null,"abstract":"<p>Finely dispersed shungite is studied as an effective filler for composite materials. Experimental data are obtained on the effect the concentration of the filler of a composite material has on its characteristics of absorbing and shielding from electromagnetic radiation in the radio and microwave ranges. The data can be used to produce effective radio-absorbing materials and electromagnetic screens for protecting information and against unwanted effects of electromagnetic radiation in radio engineering and the military.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"90 - 93"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dechlorination of Chloride–Sulfate Solutions Using Ozone","authors":"A. V. Levanov, A. O. Orujev, O. Ya. Isaikina","doi":"10.1134/S0036024424702558","DOIUrl":"10.1134/S0036024424702558","url":null,"abstract":"<p>Kinetic characteristics are determined for the release of chlorine during the oxidation of chloride ion in solutions Na<sup>+</sup>–H<sup>+</sup>–HSO<span>(_{4}^{ - })</span>–Cl<sup>−</sup>, Mg<sup>2+</sup>–H<sup>+</sup>–HSO<span>(_{4}^{ - })</span>–Cl<sup>−</sup>, Zn<sup>2+</sup>–H<sup>+</sup>–HSO<span>(_{4}^{ - })</span>–Cl<sup>−</sup>, Cu<sup>2+</sup>–H<sup>+</sup>–HSO<span>(_{4}^{ - })</span>–Cl<sup>−</sup>, Fe<sup>3+</sup>–H<sup>+</sup>–HSO<span>(_{4}^{ - })</span>–Cl<sup>−</sup>, Mg<sup>2+</sup>–H<sup>+</sup>–Cl<sup>−</sup>, and Ca<sup>2+</sup>–H<sup>+</sup>–Cl<sup>−</sup>. With similar experimental parameters, the rate of the reaction acquires considerably different values, depending on the nature of the added salt. This is due to the possible catalysis of the reaction between O<sub>3</sub> and the Cl<sup>−</sup>(aq) cations of some metals; the formation of chloride and sulfate metal complexes, which alters the actual concentrations of reagents; and a change in the solubility of ozone. The solubility of ozone, the values of the Henry constant, and the Sechenov coefficient are found for aqueous solutions of zinc sulfate and magnesium sulfate with concentrations of 0–1 M at temperatures of 20 and 25°C.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"38 - 43"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. A. Kravchenko, O. A. Kozaderov, D. D. Vakhnin, I. A. Golovin, A. E. Martynov
{"title":"Stationary Redox Sorption of Oxygen Dissolved in Water on Granular Layers of Copper-Ion-Exchange Nanocomposites","authors":"T. A. Kravchenko, O. A. Kozaderov, D. D. Vakhnin, I. A. Golovin, A. E. Martynov","doi":"10.1134/S0036024424702625","DOIUrl":"10.1134/S0036024424702625","url":null,"abstract":"<p><b>Abstract</b>—The process of redox sorption of oxygen dissolved in water on cathodically polarized granular layers of copper-ion-exchange nanocomposites was studied depending on the water flow rate and the value of the polarizing current. It is noted that initially the amount of absorbed oxygen exceeds the amount of electricity that passed. Over time, the chemical activity of the nanocomposite decreased, and oxygen continued to be sorbed and further restored mainly due to the current component of the process. It was concluded that the simultaneous increase in the water flow rate and the maximum permissible current strength has a beneficial effect on the rate of oxygen absorption. Maintaining a constant water supply mode and corresponding current strength provides a steady flow of diffusion and chemical and electrochemical stages. It has been established that the successive stages of external diffusion transfer of oxygen to the surface of nanocomposite grains, internal diffusion transfer of oxygen through grain pores, and chemical oxidation of copper nanoparticles to oxides, which is characteristic of final sources, are compensated by the stages of electroreduction of oxygen from surface adsorbed complexes and regeneration of oxidation products into metallic copper nanoparticles. The nanocomposite is a continuous source of freshly reduced metal particles and promotes the process of oxygen redox sorption to reach a steady state. Unlike the unpolarizable granular layer, the oxygen concentration remains at a low constant level under conditions of the maximum permissible imposed electric current.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"75 - 83"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. I. Kuznetsova, O. K. Lebedeva, D. Yu. Kultin, L. M. Kustov
{"title":"Comparison of the Catalytic Properties of Pt and Co Cathodes for the Nitrite Reduction Reaction to Ammonia","authors":"I. I. Kuznetsova, O. K. Lebedeva, D. Yu. Kultin, L. M. Kustov","doi":"10.1134/S0036024424702698","DOIUrl":"10.1134/S0036024424702698","url":null,"abstract":"<p>The authors study the electrochemical reduction of nitrites (NO<span>(_{2}^{ - })</span>RR) in a neutral aqueous electrolyte. This reduction reaction has important applications both for future ammonia synthesis processes for effective treatment of industrial and agricultural wastewaters. Catalytic activity is compared (results on the Faradaic efficiency and yield rate of ammonia are presented) for noble (platinum) and non-noble (cobalt) metals. Metallic polycrystalline platinum and cobalt serve as electrocatalysts. The surfaces of the catalysts are analyzed via SEM and optical microscopy. Linear voltammetry is used to preliminarily identify the potential of ammonia synthesis and estimate the current density of synthesis. The Faradaic efficiency (FE) and yield rate of ammonia release are obtained for five selected values of current densities (J). It is found that a cobalt cathode is most efficient (FE ≈ 99%, yield rate (NH<sub>3</sub>) = 2.4 mmol h<sup>−1</sup> cm<sup>−2</sup>), which exceeds the values for the platinum cathode (FE = 88.1%, yield rate (NH<sub>3</sub>) = 0.4 mmol h<sup>−1</sup> cm<sup>−2</sup>). The electrochemically active surfaces (ECSAs) of the electrocatalysts are determined. This activity of catalysts is explained according to results in this work, and shows that a non-noble metal cathode can be more effective for NO<span>(_{2}^{ - })</span>RR.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"105 - 110"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. V. Azatyan, V. M. Prokopenko, N. N. Smirnov, S. K. Abramov
{"title":"The Determining Role of Heterogeneous Reactions of Atoms and Radicals in the Spread of a Flame","authors":"V. V. Azatyan, V. M. Prokopenko, N. N. Smirnov, S. K. Abramov","doi":"10.1134/S003602442470273X","DOIUrl":"10.1134/S003602442470273X","url":null,"abstract":"<p><b>Abstract</b>—The dependence of flame propagation characteristics on heterogeneous reactions of atoms and radicals at atmospheric pressure has been established. It is noted that in addition to participating in the termination of reaction chains, adsorbed hydrogen atoms experience heterogeneous chain development: they react with O<sub>2</sub> with the formation of HO<sub>2</sub> radicals, as determined using laser magnetic resonance. In the flame, HO<sub>2</sub> radicals with H atoms form OH radicals; thus, heterogeneous chain development occurs. The flame changes the chemical properties of the surface. It is concluded that the identified mechanism and the equations obtained on its basis quantitatively describe the observed patterns.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"120 - 129"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Some Electrochemical Phenomena Accompanying the Destruction of Nanocluster Polyoxomolybdate Mo132","authors":"A. A. Ostroushko, I. D. Gagarin, A. E. Permyakova","doi":"10.1134/S0036024424702637","DOIUrl":"10.1134/S0036024424702637","url":null,"abstract":"<p>During the thermal destruction of the solid nanocluster polyoxometalate (POM) Mo<sub>132</sub> of the keplerate type, electric charges appeared in the samples due to the release of amphiphilic ionized molecular species into the environment. The sample–ground potential difference reached 100 V or more; the charge sign was determined by the presence or absence of a moderate electromagnetic field effect. In the study of the photodestruction of POM Mo<sub>132</sub> in aqueous solutions, a photogalvanic potential difference between the electrodes placed above and below in solution was observed. Fluctuations of the potential difference were also detected due to polarization/depolarization in the near-electrode zones, caused by different rates of diffusion of counterions from the upper and lower parts of solution.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"84 - 89"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. N. Novikov, E. I. Kostyleva, V. P. Bondarev, V. A. Vasiliev
{"title":"Concentration Dependences of the Heat Capacity of Ammonium Iodide Solutions in Mixed N-Methylpyrrolidone–Water Solvent at 298.15 K","authors":"A. N. Novikov, E. I. Kostyleva, V. P. Bondarev, V. A. Vasiliev","doi":"10.1134/S0036024424702583","DOIUrl":"10.1134/S0036024424702583","url":null,"abstract":"<p>Specific heat capacities are measured via calorimetry at 298.15 K (<i>c</i><sub><i>p</i></sub>) for solutions of ammonium iodide in a mixed <i>N</i>-methylpyrrolidone (MP)–water solvent throughout the range of compositions. The effect the composition of the mixed solvent has on the heat capacity of three-component NH<sub>4</sub>I–MP–H<sub>2</sub>O systems is analyzed. Standard values of partial molar heat capacities <span>({{overline {C_{p}^{0}} }_{2}})</span> are calculated for NH<sub>4</sub>I in a mixed MP–water solvent at 298.15 K.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"99 1","pages":"53 - 57"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Solubilization of the New Generation Immunomodulator Fingolimod Using Natural, Modified, and Polymeric Cyclodextrins","authors":"A. A. Garibyan, E. S. Delyagina, I. V. Terekhova","doi":"10.1134/S0036024424703096","DOIUrl":"10.1134/S0036024424703096","url":null,"abstract":"<p>Native, modified, and polymeric cyclodextrins are used for the first time to improve the solubility and bioavailability of synthetic immunomodulator fingolimod (FTY720). It is shown that the solubility of FTY720 grows in the presence of cyclodextrins. Constants of the stability of guest–host complexes and the index of efficiency of the solubilizing action of cyclodextrins are calculated from experimentally obtained phase solubility diagrams of FTY720. The effect the structure of cyclodextrin on the solubilization of FTY720 is considered.</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 14","pages":"3504 - 3508"},"PeriodicalIF":0.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Using Graph Neural Networks to Predict Positions of the Absorption Maxima of a Number of Dyes","authors":"M. M. Lukanov, A. A. Ksenofontov","doi":"10.1134/S003602442470287X","DOIUrl":"10.1134/S003602442470287X","url":null,"abstract":"<p>Results are presented from developing a model for accurately predicting the wavelength of the absorption maximum of boron(III) dipyrromethenates (BODIPYs). The model is based on a graph neural network (GNN) and includes data for >2500 dyes of various natures. Statistical parameters of the model (MAE and <i>R</i><sup>2</sup>) are 4 nm and 0.99 for the training set and 13.5 nm and 0.87 for the testing set. The developed model is available to the public in the GitHub repository (https://github.com/lukanov-9b/Abs_model.git).</p>","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 14","pages":"3342 - 3346"},"PeriodicalIF":0.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}