Key words: supercritical carbon dioxide, bioresorbable polymers, SCF-micronization, SAS, hydroxypropylmethylcellulose
Micronization of hydroxypropylmethylcellulose using supercritical antisolvent (SAS) method is studied. The influence of various parameters, such as solvent type, polymer concentration, pressure, solution to supercritical CO2 flow rate ratio on morphology of particles is discussed. The possibility of obtaining spherical or elli ptical shape hydroxypropylmethylcellulose particles of submicron size (190-620 nm) that depends on the process parameters is demonstrated.
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ГОСТ
7.0.100-2018
Preparation of hydroxypropylmethylcellulose microparticles using supercritical antisolvent precipitation / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 3-11. - DOI:
TRANSLIT
Poluchenie mikrochastic gidroksipropilmetilcellyulozy metodom sverhkriticheskogo antisol'ventnogo osazhdeniya / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 3-11. - DOI:
En
Preparation of hydroxypropylmethylcellulose microparticles using supercritical antisolvent precipitation. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 3-11 (2014). https://doi.org/
Key words: extraction, subcritical water, eucalyptus viminalis, 1,8-cineole
Extraction of biologically active substances from the leaves of eucalyptus viminalis is carried out by subcritical water in the temperature range 120—200 °C and a pressure of 5 MPa, as well as solutions of ethanol in water of different concentrations at 200 °C and 5 MPa. The extracts are analyzed using gas chromatography-mass spectrometry. Identification of the detected volatile organic compounds is realized. The content of α-pinene, β-pinene, α-phellandrene, p-cymene, 1,8-cineole in obtained extracts is determined.
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ГОСТ
7.0.100-2018
Evaluation of performance of volatile organic compounds extraction from eucalyptus viminalis (<i>Eucalypti viminalis</i> Labill.) using extractant in subcritical state / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 12-21. - DOI:
TRANSLIT
Ocenka effektivnosti izvlecheniya letuchih organicheskih soedinenij evkalipta prutovidnogo (Eucalypti viminalis Labill.) ekstragentami v subkriticheskom sostoyanii / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 12-21. - DOI:
En
Evaluation of performance of volatile organic compounds extraction from eucalyptus viminalis (<i>Eucalypti viminalis</i> Labill.) using extractant in subcritical state. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 12-21 (2014). https://doi.org/
Key words: supercritical fluid impregnation, supercritical carbon dioxide, thermoplastic polymers, photochrome indoline spirocompounds, toluene, spectrophotometry
It is demonstrated that the generation of isomer «colored» merocyanine forms B and Вх of the indoline spiroantrooxazine (SAO), which was introduced into fluoroplast F-42 matrix from supercritical carbon dioxide (SC-CO2), depends on the volume content of toluene. Toluene in this medium serves as aromatic electron-donating co-solvent. It is shown that the observed ratios of spiroantrooxazine forms content can be described in the framework of kinetic scheme that assumes the SAO molecules relocation between two phases — SC-CO2 and polymer. The «blue» B form is represented by SAO molecules solvated by toluene and localized near certain matrix fragments. Id est, this form is a part of a triple SAO/F-42/toluene complex. The formation of the «red» colored Вх form is due to the coordination of non-solvated SAO molecules penetrating into the matrix from SC-CO2 in the nearest environment of matrix F-42 polymer fragments.
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ГОСТ
7.0.100-2018
Forming of long-living «colored» spiroantrooxazine isomers incorporated into fluoroplast F-42 matrix in supercritical carbon dioxide medium / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 22-31. - DOI:
TRANSLIT
Formirovanie izomerov dolgozhivushchih «okrashennyh» form spiroantrooksazina, vvedennogo v matricu ftoroplasta F-42 v srede sverhkriticheskogo dioksida ugleroda v prisutstvii toluola / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 22-31. - DOI:
En
Forming of long-living «colored» spiroantrooxazine isomers incorporated into fluoroplast F-42 matrix in supercritical carbon dioxide medium. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 22-31 (2014). https://doi.org/
Key words: regeneration, active aluminum oxide catalyst, supercritical carbon dioxide, activity, selectivity
The nature of compounds that inactivate active aluminum oxide catalyst is studied. The results of catalyst regeneration using pure and modified with polar additive (2% wt. DMSO) supercritical carbon dioxide are presented.
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ГОСТ
7.0.100-2018
Regeneration of active aluminum oxide catalyst in supercritical carbon dioxide / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 32-41. - DOI:
TRANSLIT
Regeneraciya katalizatora «oksid alyuminiya aktivnyj» v srede sverhkriticheskogo dioksida ugleroda / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 32-41. - DOI:
En
Regeneration of active aluminum oxide catalyst in supercritical carbon dioxide. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 32-41 (2014). https://doi.org/
Key words: carbon dioxide, cellulose, nitrocellulose, nitration, relative permittivity, dinitrogen pentoxide, nitric acid, supercritical drying
Static relative permittivity of liquid carbon dioxide solutions of dinitrogen pentoxide and its mixtures with nitric, acetic or trifluoroacetic acids is measured. Procedure for nitration of cellulose acquired from various natural sources (wood, linen, hemp, cotton) by mixtures of dinitrogen pentoxide and 100% nitric acid in carbon dioxide medium is developed. Supercritical drying technique is implemented for dehydration of wet nitrocellulose.
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ГОСТ
7.0.100-2018
Relative permittivity of monocomponent and binary solutions of N<sub>2</sub>O<sub>5</sub> in liquid CO<sub>2</sub> and their activity in nitration of cellulose / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 42-52. - DOI:
TRANSLIT
Dielektricheskaya pronicaemost' odnokomponentnyh i binarnyh rastvorov N2O5 v zhidkom CO2 i ih aktivnost' v reakciyah nitrovaniya cellyulozy / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 42-52. - DOI:
En
Relative permittivity of monocomponent and binary solutions of N<sub>2</sub>O<sub>5</sub> in liquid CO<sub>2</sub> and their activity in nitration of cellulose. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 42-52 (2014). https://doi.org/
Key words: molecular separation, supercritical fluids, thermodiffusion column
The process of separation of carbon dioxide and hexafluorethane mixture in thermodiffusion column under supercritical conditions is studied. It is shown experimentally that the separation efficiency of thermodiffusion column increases when passing from gas phase to supercritical conditions.
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ГОСТ
7.0.100-2018
Separation of molecular mixture in thermodiffusion column under supercritical conditions / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 53-60. - DOI:
TRANSLIT
Razdelenie molekulyarnyh smesej v sverhkriticheskom sostoyanii v termodiffuzionnoj kolonne / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 53-60. - DOI:
En
Separation of molecular mixture in thermodiffusion column under supercritical conditions. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 53-60 (2014). https://doi.org/
Key words: supercritical carbon dioxide, β-diketonates of Ag and Eu, silica aerogel, photoluminescence, silver nanoparticles, plasmon resonance
Silica aerogels with embedded b-diketonates of Ag and Eu molecules were obtained by impregnation method using supercritical carbon dioxide (SC-CO2). Impregnation of aerogel with Eu(tta)3 molecules gives photoluminescence properties aerogel. Adsorption of Eu(tta)3 at silica clusters of aerogel pores leads to a strong broadening of the Stark components in the spectrum of its photoluminescence. Impregnation of aerogel with AgFOD molecules and subsequent laser irradiation, causes the formation of silver nanoparticles in a matrix of aerogel, as a result of AgFOD photolysis and subsequent diffusion atomic nanoassembly. The formation of filamentous structures of silver nanoparticles, due to the effects of self-organization caused by self-focusing and laser light channeling in as formed optical waveguide from nanoparticles. The peculiarities of the formation of Ag nanoparticles by laser photolysis of AgFOD in aerogel matrix directly in SC-CO2 medium are discussed.
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ГОСТ
7.0.100-2018
Photoinduced processes in β-diketonates of Ag and Eu, incorporated into SiO2 aerogel matrix by supercritical fluid impregnation / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 4. – С. 61-69. - DOI:
TRANSLIT
Fotoinducirovannye processy v β-diketonatah serebra i evropiya, vvedennyh v matricu aerogelya iz dioksida kremniya metodom sverhkriticheskoj flyuidnoj impregnacii / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 4. – S. 61-69. - DOI:
En
Photoinduced processes in β-diketonates of Ag and Eu, incorporated into SiO2 aerogel matrix by supercritical fluid impregnation. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 4, 61-69 (2014). https://doi.org/