Key words: synthesis of barium titanate, subcritical water fluid, barium titanate nanocrystals
The structure and morphology of fine-crystalline barium titanate synthesized in a subcritical water fluid at 230 °C and 2.9 MPa were studied. Barium oxide, barium hydroxide octahydrate Ba(OH)2 ⋅ 8H2O and two modifications of titanium dioxide (rutile and anatase) were used as starting reactants. Relationships between the composition and properties of the reactants and the characteristics of the product (barium titanate) were revealed. They indicate that the product structure in the subcritical water is formed via a solid-phase mechanism.
doi:10.34984/SCFTP.2018.13.2.001
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ГОСТ
7.0.100-2018
Effect of Reagents on the Properties of Barium Titanate Synthesized in Subcritical Water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 3-14. - DOI: 10.34984/SCFTP.2018.13.2.001
TRANSLIT
Vliyanie prirody reagentov na svojstva titanata bariya, sintezirovannogo v srede dokriticheskogo vodnogo flyuida / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 3-14. - DOI: 10.34984/SCFTP.2018.13.2.001
En
Effect of Reagents on the Properties of Barium Titanate Synthesized in Subcritical Water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 3-14 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.001
Key words: subcritical water, antioxidant, quercetin, rutin, hydrolysis, buds, sophora japanese, Sophora japonica L.
The possibility of obtaining quercetin (a natural antioxidant) from buds of Sophora japonica L. using subcritical water, which acts as a solvent and a reagent simultaneously was studied. The suggested approach avoids the use of expensive and toxic organic solvents, does not require separate extraction and hydrolysis steps and simplifies the purification of the product. A 13-fold reduction in treatment time was achieved compared with the traditional procedure to obtain high yield of quercetin. The loss of the target product in the production of the dried extract was reduced.
doi:10.34984/SCFTP.2018.13.2.002
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ГОСТ
7.0.100-2018
Development of One-Step («One-Pot») Technique for Production of Quercetin Antioxidant from <i>Sophora Japonica</i> L. Buds in Subcritical Water Medium / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 15-23. - DOI: 10.34984/SCFTP.2018.13.2.002
TRANSLIT
Razrabotka odnostadijnoj metodiki polucheniya antioksidanta kvercetina iz butonov sofory yaponskoj (Sophora japonica L.) v srede subkriticheskoj vody / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 15-23. - DOI: 10.34984/SCFTP.2018.13.2.002
En
Development of One-Step («One-Pot») Technique for Production of Quercetin Antioxidant from <i>Sophora Japonica</i> L. Buds in Subcritical Water Medium. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 15-23 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.002
Key words: hydroxybenzoic acids, hydroxycinnamic acids, supercritical carbon dioxide, cosolvent, molecular dynamics, hydrogen bond
Selective solvation of hydroxybenzoic (ortho-, meta- and para-hydroxybenzoic, protocatechuic, gallic, syringic) acids and hydroxycinnamic (para-coumaric, caffeic) acids by polar cosolvent (methanol) in supercritical carbon dioxide at temperature 318 K, solvent density 0.7 g/cm3 and methanol concentration 3.5 mol.% is studied using molecular dynamics method. The subject of the study is the formation of cosolvent clusters around solute, the solute — cosolvent hydrogen bonding, the structural features of hydrogen-bonded complexes associated with the molecular structure of solute (the number and location of hydroxyl groups, the substitution of hydroxyl hydrogens by methyl groups, and the presence of ethylene group between carboxyl group and benzene ring).
doi:10.34984/SCFTP.2018.13.2.003
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ГОСТ
7.0.100-2018
Solvation of Hydroxybenzoic and Hydroxycinnamic Acids in Supercritical Carbon Dioxide. Peculiarities of Hydrogen Bonding with a Polar Cosolvent / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 24-39. - DOI: 10.34984/SCFTP.2018.13.2.003
TRANSLIT
Sol'vataciya gidroksibenzojnyh i gidroksikorichnyh kislot v sverhkriticheskom diokside ugleroda. Osobennosti obrazovaniya vodorodnyh svyazej s polyarnym sorastvoritelem / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 24-39. - DOI: 10.34984/SCFTP.2018.13.2.003
En
Solvation of Hydroxybenzoic and Hydroxycinnamic Acids in Supercritical Carbon Dioxide. Peculiarities of Hydrogen Bonding with a Polar Cosolvent. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 24-39 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.003
Key words: palladium catalyst, impregnation, supercritical carbon dioxide, hydrogenation
The synthesis of palladium and palladium-silver catalysts using supercritical fluid CO2-impregnation process (static mode) was investigated. It is shown that the maximum amount of metal is impregnated to the carrier in the temperature range 318—323 K and pressure range 19.0—23.0 MPa. The activity of palladium catalysts prepared according to the proposed method is comparable with the activity of industrial samples currently produced.
doi:10.34984/SCFTP.2018.13.2.004
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ГОСТ
7.0.100-2018
Synthesis of Bimetallic Catalyst in a Static CO<sub>2</sub>-Impregnation Process / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 40-49. - DOI: 10.34984/SCFTP.2018.13.2.004
TRANSLIT
Sintez bimetallicheskogo katalizatora s ispol'zovaniem staticheskogo SO2-impregnacionnogo processa / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 40-49. - DOI: 10.34984/SCFTP.2018.13.2.004
En
Synthesis of Bimetallic Catalyst in a Static CO<sub>2</sub>-Impregnation Process. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 40-49 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.004
Key words: polymers, supercritical fluids, subcritical freons, carbon dioxide.
Process of saturation of ultra high density polyethylene with sub- and supercritical freons and supercritical carbon dioxide was investigated for the first time. It was shown that subcritical freon R22 can be absorbed in much larger amounts by these polymers than subcritical freon R410а, as well as supercritical R23 and carbon dioxide, which makes it promising for use in the processes of impregnation and sterilization of polymers.
doi:10.34984/SCFTP.2018.13.2.005
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ГОСТ
7.0.100-2018
Treatment of Ultra High Density Polyethylene and Polyethylene Terephthalate in Sub- and Supercritical Freons Media / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 50-55. - DOI: 10.34984/SCFTP.2018.13.2.005
TRANSLIT
Obrabotka polietilena vysokoj plotnosti i polietilentereftalata v sub- i sverhkriticheskih freonah / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 50-55. - DOI: 10.34984/SCFTP.2018.13.2.005
En
Treatment of Ultra High Density Polyethylene and Polyethylene Terephthalate in Sub- and Supercritical Freons Media. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 50-55 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.005
Key words: supercritical fluid impregnation, fluorescence microscopy, photoactive compounds
Fluorescence microscopy was used to study the distribution of photoactive compounds (PAC) in polymer matrixes impregnated in supercritical carbon dioxide (SC-CO2). It is shown that the character of the PAC distribution in polymers depends on the nature of the matrix, the degree of interaction of the introduced compounds with polymer fragments, and the sizes of the photoactive compounds corresponding diffusion coefficients. Such information may be in demand for the development of functionally oriented polymer systems impregnated with РAС (heterogeneous catalysis, photochromic materials, medicine).
doi:10.34984/SCFTP.2018.13.2.006
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ГОСТ
7.0.100-2018
Features of Distribution of Photoactive Fillers in Polymeric Matrixes of Different Nature at their Impregnation in the Medium of Supercritical Carbon Dioxide / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 56-68. - DOI: 10.34984/SCFTP.2018.13.2.006
TRANSLIT
Osobennosti raspredeleniya fotoaktivnyh napolnitelej v polimernyh matricah raznoj prirody pri ih impregnacii v srede sverhkriticheskogo / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 56-68. - DOI: 10.34984/SCFTP.2018.13.2.006
En
Features of Distribution of Photoactive Fillers in Polymeric Matrixes of Different Nature at their Impregnation in the Medium of Supercritical Carbon Dioxide. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 56-68 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.006
Key words: cyclone separator, supercritical fluid extraction, extract recovery
A low-volume cyclone separator with changeable extract collection reservoirs for the supercritical fluid extraction is designed. A method for manufacturing the designed separator by 3D-printing from an available polymer is proposed. It is shown that the designed small volume separator allows for a greater extract recovery compared to a standard large volume cyclone separator in the supercritical fluid extraction.
doi:10.34984/SCFTP.2018.13.2.007
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ГОСТ
7.0.100-2018
Small Volume Cyclone Separator for Supercritical Fluid Extraction / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2018. – Т. 13. – № 2. – С. 69-74. - DOI: 10.34984/SCFTP.2018.13.2.007
TRANSLIT
Ciklonnyj separator malogo ob"ema dlya sverhkriticheskoj flyuidnoj ekstrakcii / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2018. – Т. 13. – № 2. – S. 69-74. - DOI: 10.34984/SCFTP.2018.13.2.007
En
Small Volume Cyclone Separator for Supercritical Fluid Extraction. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 69-74 (2018). https://doi.org/10.34984/SCFTP.2018.13.2.007