Key words: supercritical fluid carbon dioxide, biodeterioration, micromycetes, mildew, fungicidal effect, disinfection, paper
For the first time in Russia, experience was used to evaluate the fungicidal effect of supercritical fluid carbon dioxide on 12 types of micromycetes that destroy paper. For the purpose of further use for disinfection treatment of library and museum collections, the effectiveness of various modes was assessed on paper samples with foci of biodamage caused by the micromycete Aspergillus niger: pure supercritical carbon dioxide and with the addition of ethanol as a co-solvent at a concentration of 2% and 4 %. Pure supercritical carbon dioxide results in minimal reduction of microorganisms on the surface of samples. Treatment with supercritical carbon dioxide in the presence of alcohol as a co-solvent has a pronounced fungicidal effect, which was demonstrated on all test cultures. Processing in supercritical carbon dioxide with the addition of 4% ethanol with stirring allows for a high degree of sterilization and is a promising method for processing library collections.
doi:10.34984/SCFTP.2025.20.1.001
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ГОСТ
7.0.100-2018
Supercritical Carbon Dioxide to Protect Paper Documents from Biodeterioration / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 3-14. - DOI: 10.34984/SCFTP.2025.20.1.001
TRANSLIT
Sverhkriticheskij dioksid ugleroda dlya zashchity dokumentov na bumage ot biopovrezhdenij / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 3-14. - DOI: 10.34984/SCFTP.2025.20.1.001
En
Supercritical Carbon Dioxide to Protect Paper Documents from Biodeterioration. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 3-14 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.001
Key words: supercritical fluid, supercritical carbon dioxide, copper salts, copper carbonate, copper acetate, copper thiocyanate, copper benzoate, polymer composite materials
The solubility of a series of copper salts (carbonate, acetate, benzoate and thiocyanate) in supercritical carbon dioxide at 308—328 K and 10—30 MPa was determined. The results were described using the Peng—Robinson equation of state and the Mukhopadhyay and Rao mixing rule. The results are necessary for developing technological approaches to the impregnation of polymeric materials and creating composite materials based on them.
doi:10.34984/SCFTP.2025.20.1.002
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ГОСТ
7.0.100-2018
Solubility of Copper Salts in Supercritical Carbon Dioxide / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 15-26. - DOI: 10.34984/SCFTP.2025.20.1.002
TRANSLIT
Rastvorimost' solej medi v sverhkriticheskom diokside ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 15-26. - DOI: 10.34984/SCFTP.2025.20.1.002
En
Solubility of Copper Salts in Supercritical Carbon Dioxide. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 15-26 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.002
Key words: supercritical fluids, density, fibre-optic densitometer, CO2 hydrogenation, phenol conversion
The dependences of the reaction mixture density on temperature are analyzed for the following processes: 1) catalytic hydrogenation of CO2; 2) conversion of phenol and cyclohexanol in sub- and supercritical water. The density measurements were performed using «Lazerokhim» fiber-optic densitometer. The state of the waveguide end face surface after measurements at elevated temperature was analyzed using scanning electron microscopy (SEM). It was found that for non-aqueous reaction mixtures, the laser-optical method of density monitoring is applicable in a wide range of temperatures and pressures. In the case of water and water-organic mixtures, correct determination of the densities is possible only at temperatures of 25—190°C, since an increase in temperature above 200°C leads to irreversible etching of the silicate optical waveguide end face surface by water-containing fluid.
doi:10.34984/SCFTP.2025.20.1.003
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ГОСТ
7.0.100-2018
Experience of Using the «Lazerochim» Densitometer to Determine the Densities of Water-Organic Reaction Media / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 27-41. - DOI: 10.34984/SCFTP.2025.20.1.003
TRANSLIT
Opyt ispol'zovaniya densitometra «Lazerohim» dlya opredeleniya plotnostej vodno-organicheskih reakcionnyh sred / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 27-41. - DOI: 10.34984/SCFTP.2025.20.1.003
En
Experience of Using the «Lazerochim» Densitometer to Determine the Densities of Water-Organic Reaction Media. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 27-41 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.003
Key words: supercritical lower alcohols, methanol, bornyl acetate, borneol, fir needle oil, transesterification reaction
A non-catalytic transesterification (alcoholysis) reaction of bornyl acetate in commercial fir needle oil has been carried out for the first time using supercritical lower alcohols - methanol, ethanol and isopropanol. Only the use of methanol is shown to provide high conversion and selectivity of the reaction. Thus, at 350 °C for 1 hour of reaction in autoclave-type reactor 93 % selectivity on borneol with 90 % conversion of bornyl acetate was achieved. A further increase in reaction time leads to a decrease in borneol selectivity, accompanied by an unexpected increase in camphor concentration.
doi:10.34984/SCFTP.2025.20.1.004
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ГОСТ
7.0.100-2018
Supercritical Alcoholysis of Bornyl Acetate in Fir Needle Oil for the Production of Borneol / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 42-54. - DOI: 10.34984/SCFTP.2025.20.1.004
TRANSLIT
Alkogoliz bornilacetata pihtovogo masla v sverhkriticheskih usloviyah dlya polucheniya borneola / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 42-54. - DOI: 10.34984/SCFTP.2025.20.1.004
En
Supercritical Alcoholysis of Bornyl Acetate in Fir Needle Oil for the Production of Borneol. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 42-54 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.004
Key words: aerogels, silica, dimethyl sulfoxide, transparency, modification
Dimethyl sulfoxide (DMSO) is proposed as a solvent at the gelation stage during the synthesis of transparent aerogels based on tetramethyl orthosilicate and 3-aminopropyltrimethoxysilane (APTMS). The transparency of the aerogels varied depending on the content of the aminopropyl fragment. The textural characteristics of the aerogels were studied. It was shown that the use of DMSO instead of isopropanol, a standard solvent for the synthesis of gels, allows one to significantly increase the specific surface area of the aerogels. Using DMSO as a solvent, transparent aerogels based on APTMS and modified with fragments of perfluorononanoic acid and L-phenylalanine were obtained. The possibility of obtaining transparent aerogels containing amino complexes of transition metals, namely copper and palladium, was demonstrated.
doi:10.34984/SCFTP.2025.20.1.005
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ГОСТ
7.0.100-2018
Synthesis of Transparent Amino-Modified SiO<sub>2</sub> Aerogels and their Derivatives / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 55-65. - DOI: 10.34984/SCFTP.2025.20.1.005
TRANSLIT
Sintez prozrachnyh amino-modificirovannyh SiO<sub>2</sub> aerogelej i ih proizvodnyh / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 55-65. - DOI: 10.34984/SCFTP.2025.20.1.005
En
Synthesis of Transparent Amino-Modified SiO<sub>2</sub> Aerogels and their Derivatives. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 55-65 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.005
Key words: molecular descri ptor, supercritical carbon dioxide, solubility, method QSPR, software and analytical complex, database
Mathematical models of the solubility of various groups of organic substances in supercritical carbon dioxide are proposed. The developed models are based on the quantitative structure-property ratio method. The key feature of the method is to obtain the relationship between the predicted property and the structure of the substance molecule (molecular descri ptors). As part of the work, molecular descri ptors affecting solubility were selected and dependences of the solubility of organic substances in supercritical carbon dioxide were obtained using the multiple linear regression method. The models were developed using a developed software and analytical complex and an original database containing information on the solubility of substances in supercritical carbon dioxide and information on the molecular descri ptors of soluble substances. The predictive ability of the developed models was evaluated using training and test samples of experimental data on the solubility of substances in supercritical carbon dioxide at various pressure and temperature parameters. Based on the results obtained, it was concluded that the developed models are promising for predicting the solubility of substances in supercritical carbon dioxide.
doi:10.34984/SCFTP.2025.20.1.006
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ГОСТ
7.0.100-2018
Modeling of Solubility of Organic Substances in Supercritical Carbon Dioxide / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 66-80. - DOI: 10.34984/SCFTP.2025.20.1.006
TRANSLIT
Modelirovanie rastvorimosti organicheskih veshchestv v sverhkriticheskom diokside ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 66-80. - DOI: 10.34984/SCFTP.2025.20.1.006
En
Modeling of Solubility of Organic Substances in Supercritical Carbon Dioxide. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 66-80 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.006
Key words: polymeric membranes, gas separation, 1,2-disubstituted polyacetylenes, CO2 capture, chemical modification of polymers, ionic liquids
This study focuses on the chemical modification of a polymer promising for gas separation membranes to enhance its CO2 selectivity. The possibility of introducing butylimidazolium bromide (BIm+Br-) into the structure of poly(1-trimethylsilyl-1-propyne) (PTMSP) via a two-step process was demonstrated: bromination of the initial polymer with N-bromosuccinimide followed by reaction with a tertiary amine—N-butylimidazole. Supercritical CO2 and CHF3 were used as reaction media, offering advantages over organic solvents, such as non-toxicity, non-flammability, and environmental safety. Depending on the process conditions, the proposed method allows for tuning the BIm+Br- content in the polymer structure. The obtained modified polymers exhibit good film-forming properties, thermal stability, and enhanced resistance to aliphatic, alicyclic, halogenated, and aromatic hydrocarbons. It was found that increasing the BIm+Br- content in the polymer improves the selectivity of CO2/N2 and CO2/CH4 separation while maintaining high gas permeability. These results open new possibilities for designing efficient membrane materials for industrial gas separation applications.
doi:10.34984/SCFTP.2025.20.1.007
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ГОСТ
7.0.100-2018
Chemical Modification of Poly(1-Trimethylsilyl-1-Propyne) in Supercritical Fluid Media for the Development of High-Performance Membrane Materials / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2025. – Т. 20. – № 1. – С. 81-94. - DOI: 10.34984/SCFTP.2025.20.1.007
TRANSLIT
Himicheskaya modifikaciya poli(1-trimetilsilil-1-propina) v srede sverhkriticheskih flyuidov dlya sozdaniya vysokoeffektivnyh membrannyh materialov / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2025. – Т. 20. – № 1. – S. 81-94. - DOI: 10.34984/SCFTP.2025.20.1.007
En
Chemical Modification of Poly(1-Trimethylsilyl-1-Propyne) in Supercritical Fluid Media for the Development of High-Performance Membrane Materials. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 81-94 (2025). https://doi.org/10.34984/SCFTP.2025.20.1.007