Key words: statistical physics, theory of non-ideal systems, local fluctuations, critical and supercritical states of fluid
The equations for large-scale local fluctuations in fluids — from ideal gas to non-compressible liquids, including near-critical and supercritical (SC) states — are obtained from the first principles. The contemporary notions concerning the critical state are verified and described substantially more accurately. It is demonstrated that in compressible fluids the local density fluctuation is accompanied by non-thermodynamic fluctuations of collective velocity and fluid temperature. The features of the development of such fluctuations near the critical point determine a distinctive behavior of the fluid in critical and SC states.
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ГОСТ
7.0.100-2018
The Distinctive Features of Random Local Motions in Critical and Supercritical Fluids / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 4-26. - DOI:
TRANSLIT
Osobennosti lokal'nogo dvizheniya v kriticheskih i sverhkriticheskih flyuidah / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 4-26. - DOI:
En
The Distinctive Features of Random Local Motions in Critical and Supercritical Fluids. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 4-26 (2011). https://doi.org/
Key words: supercritical carbon dioxide, allylic substitution, palladium complexes, phosphites, regioselectivity
Allylic amination and alkylation catalyzed by Pd complexes is carried out in supercritical carbon dioxide (SC-СO2) using phosphite-type ligands. It is shown that Pd-catalysts dissolved in SC-СO2 provide a high regioselectivity and thus present a useful approach to the synthesis of allylamines.
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ГОСТ
7.0.100-2018
Allylic Substitution in Supercritical Carbon Dioxide Medium Catalyzed by Palladium Complexes with Phosphite-type Ligands / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 27-34. - DOI:
TRANSLIT
Kataliziruemoe kompleksami palladiya allil'noe zameshchenie v srede sverhkriticheskogo dioksida ugleroda s uchastiem ligandov fosfitnogo tipa / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 27-34. - DOI:
En
Allylic Substitution in Supercritical Carbon Dioxide Medium Catalyzed by Palladium Complexes with Phosphite-type Ligands. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 27-34 (2011). https://doi.org/
Key words: theory of absolute rates of reactions, non-ideal reaction systems, relaxation of environment, molecular theory
The analysis of the equations for rates of elementary reactions in non-ideal systems demonstrates that traditional notion of the existence of chemical potential of the activated complex in dense phases contradicts real times of molecular and procedure of statistical averaging of molecular distributions. The expressions connecting rate constants of elementary chemical reactions obtained at atmospheric pressure and in supercritical conditions are derived.
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ГОСТ
7.0.100-2018
Role of the Local Environment Relaxation in Calculation of Reaction Rates for Non-ideal Reaction Systems / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 35-48. - DOI:
TRANSLIT
Rol' relaksacii lokal'nogo okruzheniya v raschete skorostej reakcij v neideal'nyh sredah / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 35-48. - DOI:
En
Role of the Local Environment Relaxation in Calculation of Reaction Rates for Non-ideal Reaction Systems. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 35-48 (2011). https://doi.org/
Key words: supercritical fluids, photochromism, spirocompounds, polar polymers, matrix immobilization, photoluminescence
It is shown that supercritical fluid (SCF) impregnation of polymers containing polar diphenilol and halogen groups (polyoxycarbonate, polytetrafluoroethylene, polyvinylchloride) by spirocompounds leads to conformational changes with the stabilization of merocianine form of photochroms. It is demonstrated also that previously observed effect of the formation of long-living form B of spiroantrooxazine molecules immobilized in polycarbonate matrix is also typical for other similar systems. In this work such effect is observed for a number of spirocompounds incorporated into polar polymer matrixes using the SCF impregnation method. Colored forms of spirocompounds immobilized in halogen-containing matrixes have an intense fluorescence.
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ГОСТ
7.0.100-2018
Formation of Fluorescent Long-living Merocianine Forms of Spirocompounds via their Matrix Immobilization into Polymers from Supercritical Carbon Dioxide Medium / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 49-64. - DOI:
TRANSLIT
Obrazovanie fotolyuminesciruyushchih dolgozhivushchih merocianinovyh form spirosoedinenij pri ih matrichnoj immobilizacii v polimerah s pomoshch'yu sverhkriticheskogo dioksida ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 49-64. - DOI:
En
Formation of Fluorescent Long-living Merocianine Forms of Spirocompounds via their Matrix Immobilization into Polymers from Supercritical Carbon Dioxide Medium. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 49-64 (2011). https://doi.org/
Key words: supercritical state, high-purity polystyrene, thermal polymerization
The possibility and conditions of frontal (thermal) polymerization of styrene in the conditions of the transition of its mixture with carbon dioxide into supercritical state is studied. The experimental procedure is developed and parameters (temperature and pressure) of such transition at different styrene-to-СO2 ratios are determined. The numerical study of a mathematical model of thermal polymerization of styrene in a tubular reactor is performed. The distributions of temperatures and concentrations along the reactor corresponding to the transition of the styrene — carbon dioxide mixture to the supercritical state are calculated.
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ГОСТ
7.0.100-2018
Frontal Polymerization of Styrene in the Conditions Corresponding to the Transition of the Initial Styrene-carbon Dioxide Mixture to the Supercritical state / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 65-73. - DOI:
TRANSLIT
Frontal'naya polimerizaciya stirola v usloviyah, sootvetstvuyushchih perekhodu iskhodnoj smesi stirol—dioksid ugleroda v sverhkriticheskoe sostoyanie / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 65-73. - DOI:
En
Frontal Polymerization of Styrene in the Conditions Corresponding to the Transition of the Initial Styrene-carbon Dioxide Mixture to the Supercritical state. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 65-73 (2011). https://doi.org/
Key words: supercritical carbon dioxide, quantum dots, methylmetacrylate, styrene, copolymers, polymer nanocomposites
A new method of synthesis of dispersed fluorescent polymer composites based on dispersion copolymerization of methylmetacrylate and styrene in the presence of quantum dots CdSe/CdS in supercritical carbon dioxide is suggested. A one-step scheme of the formation of fine particles of polymethylmetacrylate/polystyrene/CdSe/CdS composite is carried out and factors controlling their photoluminescent features and photochemical stability at long-term exposition under intense UV and sunlight irradiation on air are investigated.
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ГОСТ
7.0.100-2018
Fabrication of Fluorescent Nanocomposites with CdSe/CdS Quantum Dots by Dispersion Polymerization in Supercritical Carbon Dioxide / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 74-82. - DOI:
TRANSLIT
Poluchenie fluorescentnyh nanokompozitov s kvantovymi tochkami CdSE/CdS metodom dispersionnoj polimerizacii v sverhkriticheskom diokside ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 74-82. - DOI:
En
Fabrication of Fluorescent Nanocomposites with CdSe/CdS Quantum Dots by Dispersion Polymerization in Supercritical Carbon Dioxide. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 74-82 (2011). https://doi.org/
Key words: green Chinese tea, supercritical carbon dioxide, tea leafs, cellulose, elemental composition, structure
The effect of preliminary treatment in supercritical carbon dioxide (SC-СO2) on the elemental composition of tea leafs is studied. FT-IR absorption spectroscopy is employed to study the effect on the structure of green Chinese tea leafs and cellulose.
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ГОСТ
7.0.100-2018
Effect of Treatment in Supercritical Carbon Dioxide on Composition and Structure of Tea Leafs and Cellulose / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 83-91. - DOI:
TRANSLIT
Vliyanie procedur obrabotki sverhkriticheskim SO2 na sostav i strukturu chajnogo lista i cellyulozy / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 83-91. - DOI:
En
Effect of Treatment in Supercritical Carbon Dioxide on Composition and Structure of Tea Leafs and Cellulose. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 83-91 (2011). https://doi.org/
Key words: sub- and supercritical water-salt equilibria, critical phenomena, heterogenization of homogeneous SC fluids, hydrothermal salt solubility, ternary phase diagrams
Experimental studies of high temperature phase equilibria in the system BaCl2—NaCl—H2O determine the conditions when the homogeneous supercritical (SC) fluid, spreading from the binary subsystem BaCl2—H2O of type 2, transforms into the heterogeneous equilibria. These data also show that liquid-gas equilibria in ternary mixture can be continuously transformed into the immiscibility equilibria in the SC conditions. The comparison of the obtained experimental results with available data for the system K2SO4—KCl—H2O suggests that ternary systems with one volatile component formed by binary subsystems of type 2 with immiscibility and of type 1 without immiscibility have phase diagrams of the same type.
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ГОСТ
7.0.100-2018
Investigation of Phase Diagram of BaCl<sub>2</sub>—NaCl—H<sub>2</sub>O System at Temperatures up to 530°C and pressures up to 150 MPa / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2011. – Т. 6. – № 2. – С. 92-113. - DOI:
TRANSLIT
Issledovanie fazovoj diagrammy sistemy BaCl2—NaCl—H2O pri temperaturah do 530°C i davleniyah do 150 MPa / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2011. – Т. 6. – № 2. – S. 92-113. - DOI:
En
Investigation of Phase Diagram of BaCl<sub>2</sub>—NaCl—H<sub>2</sub>O System at Temperatures up to 530°C and pressures up to 150 MPa. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 92-113 (2011). https://doi.org/