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Russian Journal of Physical Chemistry B最新文献

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Capabilities of Machine Learning Methods in Prediction of Solubility of Substances in Supercritical Carbon Dioxide
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124701690
D. A. Lavrukhina, A. D. Pavlov, M. P. Shleimovich, T. R. Bilalov
{"title":"Capabilities of Machine Learning Methods in Prediction of Solubility of Substances in Supercritical Carbon Dioxide","authors":"D. A. Lavrukhina,&nbsp;A. D. Pavlov,&nbsp;M. P. Shleimovich,&nbsp;T. R. Bilalov","doi":"10.1134/S1990793124701690","DOIUrl":"10.1134/S1990793124701690","url":null,"abstract":"<p>This work reviews studies of the application of machine learning methods and neural network technologies in the prediction of solubility of various substances in supercritical fluids. By the example of an existing data set on the solubility of aromatic hydrocarbons in supercritical carbon dioxide, a prototype of a solubility prediction system was developed using a simple three-layer neural network. Its efficiency is shown, and further directions of research in this field are identified.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1815 - 1820"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632456","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}
引用次数: 0
Synthesis of Praseodymium-Doped GeO2 Aerogels by Impregnation
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124701343
D. A. Khvoshchevskaya, V. O. Veselova, S. V. Golodukhina, S. Yu. Kottsov, A. G. Son, O. M. Gaitko
{"title":"Synthesis of Praseodymium-Doped GeO2 Aerogels by Impregnation","authors":"D. A. Khvoshchevskaya,&nbsp;V. O. Veselova,&nbsp;S. V. Golodukhina,&nbsp;S. Yu. Kottsov,&nbsp;A. G. Son,&nbsp;O. M. Gaitko","doi":"10.1134/S1990793124701343","DOIUrl":"10.1134/S1990793124701343","url":null,"abstract":"<p>A simple method for the preparation of doped GeO<sub>2</sub> aerogels is proposed. At the first stage, a gel with a composition of (NH<sub>4</sub>)<sub>3</sub>H(Ge<sub>7</sub>O<sub>16</sub>)(H<sub>2</sub>O)<sub><i>x</i></sub> was obtained by dissolving germanium dioxide in aqueous ammonia with pH 8.2. The dopant ions were introduced by impregnating the hydrogels with a dimethyl sulfoxide (DMSO) solution of praseodymium nitrate. The optimum conditions of the synthesis were determined, which allow uniform distribution of the dopant ion in the matrix. The Pr/Ge ratio in the resulting aerogels was 0.1. The aerogel samples were characterized in detail by IR, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), low-temperature nitrogen adsorption, etc. It was found that praseodymium affects the luminescence characteristics of GeO<sub>2</sub> aerogels during excitation radiation with a wavelength of 240, 255, and 390 nm.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1785 - 1794"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632457","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}
引用次数: 0
Formation of Compounds and Phases in La–M–Al (M = Ca, Mg, Sr, Ba) Oxide Systems Subjected to Treatment in a Water Fluid Medium and Their Catalytic Properties in the Oxidative Coupling of Methane
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124701732
P. R. Vasyutin, M. Yu. Sinev, Yu. A. Gordienko, Yu. D. Ivakin, E. A. Lagunova
{"title":"Formation of Compounds and Phases in La–M–Al (M = Ca, Mg, Sr, Ba) Oxide Systems Subjected to Treatment in a Water Fluid Medium and Their Catalytic Properties in the Oxidative Coupling of Methane","authors":"P. R. Vasyutin,&nbsp;M. Yu. Sinev,&nbsp;Yu. A. Gordienko,&nbsp;Yu. D. Ivakin,&nbsp;E. A. Lagunova","doi":"10.1134/S1990793124701732","DOIUrl":"10.1134/S1990793124701732","url":null,"abstract":"<p>The formation of mixed oxides in La<sub>2</sub>O<sub>3</sub>/MO–Al<sub>2</sub>O<sub>3</sub> systems (M is a group IIA element: Mg, Ca, Sr, Ba) subjected to a high-temperature treatment and treatment in a water fluid (WF) medium is studied. It is shown that the high-temperature treatment of a group IIA element aluminate with supported lanthanum nitrate leads to the formation of LaAlO<sub>3</sub> only in the case of an Mg-containing system. In other cases, original aluminates do not undergo transformations, and lanthanum oxide is formed. The treatment of La/M–Al ternary systems in a WF medium leads to the formation of LaAlO<sub>3</sub> in all cases; in addition, in all samples, except for the Ba-containing system, phases of free oxides of group IIA metals appear. The increase in the activity and selectivity of La/M–Al ternary oxide systems in the oxidative coupling of methane compared to the respective parameters of M–Al binary systems is attributed to the presence of an individual La<sub>2</sub>O<sub>3</sub> oxide phase.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1853 - 1860"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632580","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}
引用次数: 0
Solubility of N-Isopropylacrylamide in Carbon Dioxide
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124701756
A. A. Popova, M. O. Kostenko, E. N. Golubeva
{"title":"Solubility of N-Isopropylacrylamide in Carbon Dioxide","authors":"A. A. Popova,&nbsp;M. O. Kostenko,&nbsp;E. N. Golubeva","doi":"10.1134/S1990793124701756","DOIUrl":"10.1134/S1990793124701756","url":null,"abstract":"<p>The solubility isotherms of <i>N</i>-isopropylacrylamide monomer (NIPAM) in supercritical carbon dioxide were obtained by the synthetic visual method in the temperature range of 304.8–353.0 K and the pressures range of 0.1–40.0 MPa, and the maximal solubility of NIPAM in CO<sub>2</sub> at these state parameters was determined. In addition, the region of crossover of isotherms <i>P</i><sub>mix</sub> = <i>f</i>(<i>x</i>) was detected, and the nature of this phenomenon was discussed. The predictive ability of the Chrastil model was assessed for this system.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1869 - 1877"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632551","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}
引用次数: 0
Application of Supercritical Fluids for the Separation of Group Components of Petroleum Systems (Review)
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124030035
A. V. Pripakhaylo, R. N. Magomedov, L. S. Foteeva, O. V. Shapovalova
{"title":"Application of Supercritical Fluids for the Separation of Group Components of Petroleum Systems (Review)","authors":"A. V. Pripakhaylo,&nbsp;R. N. Magomedov,&nbsp;L. S. Foteeva,&nbsp;O. V. Shapovalova","doi":"10.1134/S1990793124030035","DOIUrl":"10.1134/S1990793124030035","url":null,"abstract":"<p>This review examines information on modern methods of separating oils and oil residues in the analysis of group composition using supercritical fluids. The features of the influence of the composition and properties of individual group components of oil samples on further processing are shown. Traditional methods of separating petroleum feedstock into group components are briefly reviewed. The results of modern studies of extraction methods for separating oil samples using supercritical fluids are shown. Information is presented on new methods for the extraction of asphaltenes and fractionation of heavy oils and oil residues using СO<sub>2</sub>.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1878 - 1892"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632578","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}
引用次数: 0
Effect of the Extraction Method and Conditions on the Content of Polyphenols in Buckwheat Fagopyrum esculentum Husk Extracts and Their Acetylcholinesterase-Inhibiting Activity
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124701744
S. S. Khizrieva, S. N. Borisenko, E. V. Maksimenko, A. V. Ippolitova, K. O. Shchedrina, N. I. Borisenko, V. I. Minkin
{"title":"Effect of the Extraction Method and Conditions on the Content of Polyphenols in Buckwheat Fagopyrum esculentum Husk Extracts and Their Acetylcholinesterase-Inhibiting Activity","authors":"S. S. Khizrieva,&nbsp;S. N. Borisenko,&nbsp;E. V. Maksimenko,&nbsp;A. V. Ippolitova,&nbsp;K. O. Shchedrina,&nbsp;N. I. Borisenko,&nbsp;V. I. Minkin","doi":"10.1134/S1990793124701744","DOIUrl":"10.1134/S1990793124701744","url":null,"abstract":"<p>The effect of the extraction method and conditions on the polyphenolic composition of buckwheat <i>Fagopyrum esculentum</i> husk extracts and their activity in inhibiting acetylcholinesterase (AChE) was studied. The extracts were obtained both by the conventional method of water–ethanol extraction and in a subcritical water medium at 120–220°C. A direct correlation was found between the anticholinesterase activity and the content of polyphenols in the extracts. The highest activity in inhibiting AChE was shown by the extract obtained in the subcritical water medium at 220°C, which contained the maximum amounts of polyphenols and flavonoids. This indicates the decisive role of these compounds in inhibiting AChE. The obtained data allow one to consider buckwheat husk extracts as inexpensive and renewable sources of polyphenolic compounds and flavonoids with P-vitamin and neuroprotective activity.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1861 - 1868"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632453","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}
引用次数: 0
Composites of Graphitic Carbon Nitride with Silica Aerogel: Recyclable Immobilized Photocatalysts for Sulfide Oxidation with Oxygen in SC-CO2
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124701719
E. A. Ivanova, M. N. Zharkov, V. G. Merkulov, V. I. Gladilina, I. V. Kuchurov, P. S. Artemova, E. O. Pentsak, S. G. Zlotin
{"title":"Composites of Graphitic Carbon Nitride with Silica Aerogel: Recyclable Immobilized Photocatalysts for Sulfide Oxidation with Oxygen in SC-CO2","authors":"E. A. Ivanova,&nbsp;M. N. Zharkov,&nbsp;V. G. Merkulov,&nbsp;V. I. Gladilina,&nbsp;I. V. Kuchurov,&nbsp;P. S. Artemova,&nbsp;E. O. Pentsak,&nbsp;S. G. Zlotin","doi":"10.1134/S1990793124701719","DOIUrl":"10.1134/S1990793124701719","url":null,"abstract":"<p>Composites of gC<sub>3</sub>N<sub>4</sub> particles immobilized in monolithic silica aerogel have been obtained, and their physicochemical photocatalytic properties were studied. The composites may be reused many times. They showed higher photocatalytic activity than free gC<sub>3</sub>N<sub>4</sub> in the oxidations of alkyl aryl sulfides with molecular oxygen in supercritical carbon dioxide (SC-CO<sub>2</sub>). The results presented in this work can serve as a basis for the development of efficient processes of organic compounds oxidation.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1830 - 1840"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632454","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}
引用次数: 0
Dynamics of Submicron Gold Particle Formation during Laser Ablation in Supercritical Carbon Dioxide
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124030047
E. O. Epifanov, N. M. Asharchuk, D. N. Khmelenin, I. V. Trofimov, A. O. Rybaltovsky, G. V. Mishakov, T. A. Semenov, N. V. Minaev, E. I. Mareev
{"title":"Dynamics of Submicron Gold Particle Formation during Laser Ablation in Supercritical Carbon Dioxide","authors":"E. O. Epifanov,&nbsp;N. M. Asharchuk,&nbsp;D. N. Khmelenin,&nbsp;I. V. Trofimov,&nbsp;A. O. Rybaltovsky,&nbsp;G. V. Mishakov,&nbsp;T. A. Semenov,&nbsp;N. V. Minaev,&nbsp;E. I. Mareev","doi":"10.1134/S1990793124030047","DOIUrl":"10.1134/S1990793124030047","url":null,"abstract":"<p>The dynamics of submicron gold particle formation during laser ablation in supercritical and liquid CO<sub>2</sub> are investigated using time-resolved Mie scattering absorption spectroscopy. It is found that a high density of CO<sub>2</sub> of approximately 800 kg/m<sup>3</sup>, regardless of the phase state, leads to the formation of laser-induced medium fluctuations on time scales of 10 to 1000 μs, during which the defocusing of subsequent laser pulses may occur. Under conditions of the reduced fluid density in the vicinity of the Widom region (<i>P</i> = 8.5 МРa, <i>T</i> = 310 K), it is demonstrated that nanoparticles can leave the interaction zone unhindered as evidenced by the exponential increase in integral absorption. Data from the absorption spectra allow the observation of the nanoparticle formation dynamics with an average diameter of approximately 160 nm and a log-normal size distribution, the width of which is determined by the thermodynamic conditions of CO<sub>2</sub>.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1948 - 1957"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632553","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}
引用次数: 0
Equilibria in the Copper Hexafluoroacetylacetonate–CO2–Al2O3 System1
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124030072
M. O. Kostenko, Ya. I. Zuev, A. A. Ovechkina, M. A. Kurykin, O. O. Parenago
{"title":"Equilibria in the Copper Hexafluoroacetylacetonate–CO2–Al2O3 System1","authors":"M. O. Kostenko,&nbsp;Ya. I. Zuev,&nbsp;A. A. Ovechkina,&nbsp;M. A. Kurykin,&nbsp;O. O. Parenago","doi":"10.1134/S1990793124030072","DOIUrl":"10.1134/S1990793124030072","url":null,"abstract":"<p>The solubility of copper(II) hexafluoroacetylacetonate monohydrate Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O in carbon dioxide was studied. The solubility increases with increasing temperature in the range of 303–353 K and was observed to increase nonlinearly with increasing CO<sub>2</sub> density in the supercritical (SC) region. The dependence of the solubility on the parameters of state (temperature, CO<sub>2</sub> density) was described by the Chrastil equation. The adsorption of Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O from a solution in SC-CO<sub>2</sub> on three γ-Al<sub>2</sub>O<sub>3</sub> samples differing in the presence of acidic and basic additives was investigated. The adsorption isotherms have a shape with a sharp increase in the adsorption value in the initial part, which indicates a high affinity of the complex for the surface of the substrate and/or its heterogeneity, as well as the presence of sites with high adsorption energy. An increase in the CO<sub>2</sub> density from 355 to 780 kg/m<sup>3</sup> at a constant temperature (313 K) leads to a decrease in the adsorption of Cu(hfa)<sub>2</sub>⋅H<sub>2</sub>O on all three Al<sub>2</sub>O<sub>3</sub> samples. At a constant medium density of 355 kg/m<sup>3</sup> and an increase in temperature from 313 to 343 K, a more complex behavior of the adsorption isotherms is observed depending on the characteristics of the support and the concentration range of the adsorbed substance.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1939 - 1947"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632554","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}
引用次数: 0
Supercritical Water Cooxidation of Poultry Manure and Brown Coal in the Flow Mode
IF 1.4 4区 化学
Russian Journal of Physical Chemistry B Pub Date : 2025-03-16 DOI: 10.1134/S1990793124030059
O. N. Fedyaeva, S. A. Alekhin, S. V. Morozov, M. Ya. Sokol, D. O. Artamonov, A. V. Shishkin, A. A. Vostrikov
{"title":"Supercritical Water Cooxidation of Poultry Manure and Brown Coal in the Flow Mode","authors":"O. N. Fedyaeva,&nbsp;S. A. Alekhin,&nbsp;S. V. Morozov,&nbsp;M. Ya. Sokol,&nbsp;D. O. Artamonov,&nbsp;A. V. Shishkin,&nbsp;A. A. Vostrikov","doi":"10.1134/S1990793124030059","DOIUrl":"10.1134/S1990793124030059","url":null,"abstract":"<p>The results of joint supercritical water oxidation (SCWO) on poultry manure (PM) and brown coal (BC) mixtures continuously fed as an NaOH stabilized (0.8 wt %) slurry into a tubular reactor at 25 MPa, temperature gradient along its vertical axis of 390–600°C, varied reactant flow rate, and concentrations of PM and BC in the slurry are presented. The addition of BC leads to a reduction of the total energy consumption by ohmic heaters by factors of 1.5–1.8, depending on the content of combustible matter in the slurry. The forming gas mixture contains CO<sub>2</sub>, N<sub>2</sub>, and a trace amount of N<sub>2</sub>O. Calcium and sodium carbonates, phosphates, and aluminosilicates are predominant in the composition of ash residues. The total content of phenols (17–32 μg/dm<sup>3</sup>) and polycyclic aromatic hydrocarbons (2–4 μg/dm<sup>3</sup>) in the effluent depends on the PM concentration in the slurry and does not exceed the level of their maximum permissible concentration in wastewater. The formation of HNO<sub>3</sub> and H<sub>2</sub>SO<sub>4</sub> during the SCWO process results in the corrosion of construction materials and increases the content of chromium, copper, and nickel in the aqueous effluent. The mechanisms of the transformation of the organic and mineral components of PM and BC are discussed.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 8","pages":"1924 - 1938"},"PeriodicalIF":1.4,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632439","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}
引用次数: 0
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