Key words: high temperature adiabatic calorimeter; isochoric heat capacity; critical point; supercritical fluids; equation of state
This review presents the results of a detailed analysis of the role of isochoric heat
capacity as a key thermodynamic property of a substance in the study of critical and
supercritical phenomena. A brief historical background is given on the role and
contribution of Russian scientific schools in the experimental study of isochoric heat
capacity in the critical region in the development of the non-classical (scaling) theory
of critical phenomena, which considerably changed our understanding of the physical
nature of critical and supercritical phenomena. The experimental behavior of the
isochoric heat capacity and other thermodynamic properties of fluids associated with
it in the critical and supercritical regions are analyzed in detail. The role of new
experimental studies of two-phase isochoric heat capacity near the critical point in
the development of a “complete” scaling theory is discussed. This theory allows to
understand the physical nature of the liquid-gas coexistence curve asymmetry near
the critical point and to estimate the contribution of the chemical potential to the
divergence of the two-phase isochoric heat capacity at the critical point. The review
also focuses on supercritical phase transitions and the role of isochoric heat capacity
in determining the Widom line, which separates liquid- and gas-like regions in
supercritical states, i.e. defines the boundaries of the coexistence of “liquid-” and “gaslike”
phases in supercritical fluids.
doi:10.34984/SCFTP.2020.15.1.002
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ГОСТ
7.0.100-2018
Termodynamic and Transport Properties of Supercritical Fluids.
Part 1. Thermodynamic Properties.
/
–
Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика..
–
2020.
– Т. 15. – № 1.
– С.
34-91.
- DOI:
10.34984/SCFTP.2020.15.1.002
TRANSLIT
Termodinamicheskie i transportnye svojstva sverhkriticheskih flyuidov. CHast' 1. Termodinamicheskie svojstva / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 1. – S. 34-91. - DOI: 10.34984/SCFTP.2020.15.1.002
En
Termodynamic and Transport Properties of Supercritical Fluids.
Part 1. Thermodynamic Properties..
Sverhkriticheskie Flyuidy: Teoriya i Praktika,
1,
34-91
(2020).
https://doi.org/10.34984/SCFTP.2020.15.1.002
Key words: aerogel, aluminum oxide, metal oxides, supercritical drying, supercritical carbon dioxide, specific surface area, porosity
Alumina aerogels were obtained using sol-gel synthesis and subsequent supercritical
drying. Sol-gel synthesis was carried out by adding epichlorohydrin to aluminum chloride
dissolved in water and ethanol. Supercritical drying (SCD) of gels was carried out in
supercritical carbon dioxide at 40 °C and 12,0 MPa for 8 hours. The structural
characteristics of aerogels were studied by nitrogen porometry, helium pycnometry
and scanning electron microscopy. The resulting materials have high specific surface
area (up to 764 m2/g) and porosity (up to 96,2 %, pore volume up to 4,9 cm3/g) and
low density (below 0,066 g/cm3). It was found that the structural characteristics of
aerogels can be controlled by changing the «water : precursor» ratio. In particular, an
increase in this ratio leads to an increase in the specific surface area and pore volume.
doi:10.34984/SCFTP.2020.15.1.003
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ГОСТ
7.0.100-2018
Effect of «Water-Precursor» Ratio on the Structural Characteristics of Aluminum Oxide Aerogels / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 1. – С. 92-102. - DOI: 10.34984/SCFTP.2020.15.1.003
TRANSLIT
Vliyanie sootnosheniya «voda-prekursor» na strukturnye harakteristiki aerogelej oksida alyuminiya / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 1. – S. 92-102. - DOI: 10.34984/SCFTP.2020.15.1.003
En
Effect of «Water-Precursor» Ratio on the Structural Characteristics of Aluminum Oxide Aerogels. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 92-102 (2020). https://doi.org/10.34984/SCFTP.2020.15.1.003
Key words: molecular dynamics, modeling, solvation, dilute aqueous solutions, normal conditions, supercritical conditions, water-ethanol solutions, water-guaiacol solutions, water-phenol solutions, lignin, self-diffusion coefficient, clustering
Using a classical molecular dynamics method structures of 2 wt. % water solutions of
ethanol, phenol and o-methoxyphenol (guaiacol) were modeled in NVT-ensemble at
densities 0.997 and 0.133 g cm-3 that corresponds to normal (298 K; 0.1 MPa) and
supercritical (673 K; 23.0 MPa) conditions. Self-diffusion coefficients for individual
components in solutions, radial distribution functions for oxygen atoms of water
molecules, for oxygen atoms in hydroxy-groups and for centers of masses in phenol
molecules are calculated. A possibility of molecule clusterization for diluted substances
is analyzed. The data obtained indicate the heterogeneity of solutions in which clusters
of different composition and structure can exist. It was found that under normal
conditions clustering of up to seven ethanol and phenol molecules can occur, and
dimer formation was detected under SC-conditions. The structural features of solutions
under normal and SC-conditions were compared. The difference between the water
shells of ethanol and phenols molecules was demonstrated. Under normal conditions,
stable shells of water molecules form around ethanol molecules. For phenols, the solvate
shells are unstable and a tendency to clusterization of organic molecules is pronounced.
doi:10.34984/SCFTP.2020.15.1.004
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ГОСТ
7.0.100-2018
Solvation of Ethanol, Phenol and o-Methoxyphenol in Diluted Water Solutions in Normal and Supercritical Conditions / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 1. – С. 103-111. - DOI: 10.34984/SCFTP.2020.15.1.004
TRANSLIT
Sol'vataciya etanola, fenola i o-metoksifenola v razbavlennyh vodnyh rastvorah pri normal'nyh i sverhkriticheskih usloviyah / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 1. – S. 103-111. - DOI: 10.34984/SCFTP.2020.15.1.004
En
Solvation of Ethanol, Phenol and o-Methoxyphenol in Diluted Water Solutions in Normal and Supercritical Conditions. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 103-111 (2020). https://doi.org/10.34984/SCFTP.2020.15.1.004
Key words: supercritical fluidic plasticization, quasi-isothermal expansion, foam, amorphous polylactide, carbon dioxide, equation of state, polytropic index, surface tension, collapse
The results of experimental and theoretical studies of the behavior of the amorphous
D,L-polylacide fo am are presented. D,L-polylacide was preliminary plasticized using
sub- or supercritical carbon dioxide under the constant temperature (313,3 K) and
various pressures from 4 MPa to 20 MPa; after plasticization, it was foamed using the
quasi-isothermal depressurization under the low depressurization rates (from 0,005
to 0,05 MPa/s). It was established that, in the case of polylactide plasticization in the
supercritical domain (with the pressures of carbon dioxide above 8 MPa), the transition
from the expansion of the polylactide foam to collapse occurs in the course of
depressurization. Using the equation of state for a thermodynamically equilibrium
foam, which was pioneered by S. Ross, the criterion of the expansion-to-collapse transition
was established. It was shown that this phenomenonis caused by asignificant increase
in the surface tension of polymer during a slow decrease in the pressure of carbon
dioxide.
doi:10.34984/SCFTP.2020.15.1.005
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ГОСТ
7.0.100-2018
Features of Quasi-Isothermal Foaming of the SCF-Plasticized Polylactide: the Effect of Transition from the Foam Expansion to Collapse / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 1. – С. 112-123. - DOI: 10.34984/SCFTP.2020.15.1.005
TRANSLIT
Osobennosti kvazi-izotermicheskogo vspenivaniya SKF-plastificirovannogo polilaktida: effekt perekhoda ot rasshireniya k kollapsu peny / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 1. – S. 112-123. - DOI: 10.34984/SCFTP.2020.15.1.005
En
Features of Quasi-Isothermal Foaming of the SCF-Plasticized Polylactide: the Effect of Transition from the Foam Expansion to Collapse. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 112-123 (2020). https://doi.org/10.34984/SCFTP.2020.15.1.005
Key words: supercritical fluid technologies, bioresorbable scaffolds and microparticles, encapsulation of gentamicin and levofloxacin, kinetics of release into physiological media
Gentamicin and levofloxacin were encapsulated into bioresorbable polymer scaffolds
and microparticles by SCF methods — PGSS and plasticization and subsequent foaming
of amorphous polymers using supercritical carbon dioxide. Release kinetics of
incorporated drug substances into model physiological media was studied. It was shown
that the use of the developed methods of SCF-encapsulation of drugs in bioresorbable
carriers allows varying the size, shape and morphology of formed structures and
accordingly the rate of release of drugs into physiological environments. In our opinion,
this approach can be very promising for the development of components of new
highly effective antibacterial prolonged dosage forms.
doi:10.34984/SCFTP.2020.15.1.006
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ГОСТ
7.0.100-2018
Development of Prolonged Antibacterial Dosage Forms Components Using SCF-Technologies / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 1. – С. 124-135. - DOI: 10.34984/SCFTP.2020.15.1.006
TRANSLIT
Razrabotka komponentov antibakterial'nyh lekarstvennyh form prolongirovannogo dejstviya s ispol'zovaniem SKF-tekhnologij / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 1. – S. 124-135. - DOI: 10.34984/SCFTP.2020.15.1.006
En
Development of Prolonged Antibacterial Dosage Forms Components Using SCF-Technologies. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 124-135 (2020). https://doi.org/10.34984/SCFTP.2020.15.1.006
Key words: porcine cartilage, decellularization, surfactants, supercritical CO2, ethanol, histological studies, DNA, mesenchymal stromal cells
At obtaining tissue-specific scaffolds of dense tissues from decellularized porcine
articular cartilage it was found that full decellularization of tissue takes surfactant
treatment followed by supercritical fluides treatment. An introduction of ethanol as a
polarity modifier enables to increase significantly a completeness of cartilage
decellularization backgrounded by reduction of the destructive changes in the
extracellular matrix. Preservation of morphology and active proliferation of mesenchymal
stromal cells of human adi pose tissue in the presence of tissue-specific scaffold of
porcine cartilage evidence an opportunity of its use as a cell carrier for tissue
engineering of cartilage.
doi:10.34984/SCFTP.2020.15.2.001
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ГОСТ
7.0.100-2018
Features of Obtaining a Tissue-Specific Matrix from Decellularized Porcine Cartilage / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 3-13. - DOI: 10.34984/SCFTP.2020.15.2.001
TRANSLIT
Osobennosti polucheniya tkanespecificheskogo matriksa iz decellyulyarizovannogo hryashcha svin'i / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 3-13. - DOI: 10.34984/SCFTP.2020.15.2.001
En
Features of Obtaining a Tissue-Specific Matrix from Decellularized Porcine Cartilage. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 3-13 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.001
Key words: reactivity, titanium oxide, alumina, hydration, water fluid, titanates of rare-earth elements
The synthesis of strontium and barium titanates supported on the porous carrier
(α-Al2O3) was performed via the treatment of the previously deposited precursors
(titanium oxide, strontium nitrate, barium nitrite) in the water fluid medium at 400 °C.
The obtained samples were characterized using the X-Ray Powder Diffraction (XRD)
and Scanning Electron Microscopy combined with Energy Dispersion X-Ray analysis
(SEM-EDX) techniques. It was found that in the presence of titanium oxide α-alumina
undergoes a partial hydration with the formation of the basic aluminum hydroxide
AlO(OH) (boemite) that was not found using the XRD method after the treatment
of the pure α-Al2O3 in the same conditions. Using the SEM-EDX method we
demonstrated that in spite of much higher content of alumina in the samples, strontium
ions preferably interact with titania forming SrTiO3. It was shown that samples with
different spatial distribution of the supported component inside the carrier particle
can be obtained by varying the method of the preliminary deposition of the titania
precursor (titanium tetra-iso-propoxide).
doi:10.34984/SCFTP.2020.15.2.002
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ГОСТ
7.0.100-2018
Reactivity of Aluminum and Titanium Oxides in the Conditions of Strontium and Barium Titanates Synthesis in Water Fluid Medium / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 14-26. - DOI: 10.34984/SCFTP.2020.15.2.002
TRANSLIT
Reakcionnaya sposobnost' oksidov alyuminiya i titana v usloviyah sinteza titanatov stronciya i bariya v srede vodnyh flyuidov / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 14-26. - DOI: 10.34984/SCFTP.2020.15.2.002
En
Reactivity of Aluminum and Titanium Oxides in the Conditions of Strontium and Barium Titanates Synthesis in Water Fluid Medium. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 14-26 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.002
Key words: quasi-isothermalfoaming, amorphouspolylactide, carbondioxide, nucleation, Gibbsenergy, binodal, spinodal
Mechanisms controlling the nucleation kinetics in the foamed amorphous D,L-polylactide,
which is preliminary plasticized using sub-ical or supercritical carbon
dioxide, are established using analysis of videodata on the depressurization-induced
quasi-isothermal (313,3 K) foaming of the polymer. Possible scenarios of the phase
separation in the polylatide—carbon dioxide system at the stage, which precedes the
expressed foam formation, are considered.
doi:10.34984/SCFTP.2020.15.2.003
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ГОСТ
7.0.100-2018
Competition of the Phase Separation Processes at Quasi-Isothermal Foaming of Polylactide in Carbon Dioxide Environment / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 27-41. - DOI: 10.34984/SCFTP.2020.15.2.003
TRANSLIT
Konkurenciya processov razdeleniya faz pri kvazi-izotermicheskom vspenivanii polilaktida v atmosfere dioksida ugleroda / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 27-41. - DOI: 10.34984/SCFTP.2020.15.2.003
En
Competition of the Phase Separation Processes at Quasi-Isothermal Foaming of Polylactide in Carbon Dioxide Environment. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 27-41 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.003
Key words: Scots pine, supercritical fluid extraction, essential oil, terpenes, antibacterial activity
The paper presents a comparative analysis of influence of extraction methods that
meet the princi ples of «green chemistry» on the extraction degree of components
from the wood greenery of Pinus sylvestris. Analysis of the obtained alcohol extract,
essential oil and supercritical extracts by GC-MS method showed that differences are
observed in both the quantitative and qualitative composition of the studied objects.
The highest selectivity of the diterpene fraction extraction and the expansion of the
spectrum of individual components extracted from wood greenery by supercritical
fluid extraction with carbon dioxide compared to traditional extraction methods while
maintaining a high antimicrobial activity of the resulting extract to suppress Escherichia
coli strains is shown.
doi:10.34984/SCFTP.2020.15.2.004
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ГОСТ
7.0.100-2018
Composition and Antimicrobial Activity of Essential Oil and Supercritical Extracts of Pinus sylvestris Wood Greenery / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 42-58. - DOI: 10.34984/SCFTP.2020.15.2.004
TRANSLIT
Sostav i antimikrobnaya aktivnost' efirnogo masla i sverhkriticheskih ekstraktov drevesnoj zeleni Pinus sylvestris / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 42-58. - DOI: 10.34984/SCFTP.2020.15.2.004
En
Composition and Antimicrobial Activity of Essential Oil and Supercritical Extracts of Pinus sylvestris Wood Greenery. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 42-58 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.004
Key words: aromatization, dehydrocyclodimerization, n-butane, ZSM-5, Ga/H-ZSM-5, supercritical conditions
A comparative study of n-butane conversion into aromatic hydrocarbons over ZSM-5
zeolite in H-form and modified with gallium and platinum at 530 °C in gas phase
(1 atm) and under supercritical conditions (190 atm) was carried out. The catalysts
demonstrate high activity, stability, and productivity under supercritical conditions. In
contrast to the gas phase process, modification of ZSM-5 zeolite with gallium and
platinum had no affect on the distribution of n-butane aromatization products in
supercritical conditions.
doi:10.34984/SCFTP.2020.15.2.005
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ГОСТ
7.0.100-2018
Dehydrocyclodimerization of n-Butane into Aromatic Hydrocarbons in Gas Phase and Supercritical Conditions Over ZSM-5 Zeolite in H-Form and Modified with Ga and Pt / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 59-66. - DOI: 10.34984/SCFTP.2020.15.2.005
TRANSLIT
Degidrociklodimerizaciya n-butana v aromaticheskie uglevodorody v gazofaznyh i sverhkriticheskih usloviyah na ceolite ZSM-5 v N-forme i modificirovannom Ga i Pt / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 59-66. - DOI: 10.34984/SCFTP.2020.15.2.005
En
Dehydrocyclodimerization of n-Butane into Aromatic Hydrocarbons in Gas Phase and Supercritical Conditions Over ZSM-5 Zeolite in H-Form and Modified with Ga and Pt. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 59-66 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.005
Key words: aqueous salt solutions, phase equilibria, immiscibility, critical phenomena
The study concerns phase equilibria and critical phenomena in the
Na2SO4—Na2B4O7—H2O
system with two boundary subsystems: Na2B4O7—H2O (type 1 with liquid phase
immiscibility of solutions) and Na2SO4—H2O (type 2) at 350—460 °C and pressure
up to 100 MPa. It is shown that there are two three-phase regions — (l1-l2-s) adjacent
to two aqueous salt subsystems and separated by a fluid region at the temperatures
from 440 °C (critical point Q (l1=l2-s) of the type 2 binary system) to ~455 °C when
these regions integrate with each other. The three-component system is characterized
by two critical curves in saturated solutions. The curves extend from different critical
points of the type 2 binary subsystem — g=l-s (point p) and l1=l2-s (point Q). These
curves end at the ternary critical points — pR (g=l1-l2-s) and QN (g-l1=l2-s), respectively,
with a four-phase equilibrium (g-l1-l2-s) between them in the temperature
range of 350—380 °C, according to the visual observations in sealed quartz ampoules.
doi:10.34984/SCFTP.2020.15.2.006
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ГОСТ
7.0.100-2018
Immiscibility of Liquid Phases and Critical Phenomena in the Na2SO4—Na2B4O7—H2O System at 350—460 °C and Pressure up to 100 MPa / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 67-78. - DOI: 10.34984/SCFTP.2020.15.2.006
TRANSLIT
Nesmeshivaemost' zhidkih faz i kriticheskie yavleniya v sisteme Na2SO4—Na2B4O7—H2O pri 350—460 °S i davlenii do 100 MPa / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 67-78. - DOI: 10.34984/SCFTP.2020.15.2.006
En
Immiscibility of Liquid Phases and Critical Phenomena in the Na2SO4—Na2B4O7—H2O System at 350—460 °C and Pressure up to 100 MPa. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 67-78 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.006
Key words: propylene glycol, supercritical propane / butane mixture, phase equilibrium, solubility, Peng—Robinson equation of state, Mukhopadhyay and Rao mixing law
The phase equilibrium of the propylene glycol—propane/butane system and the solubility
of propylene glycol in supercritical propane-butane mixture at temperatures 403, 423
and 443 K using a high-pressure optical cell were studied. The results were described
using the Peng—Robinson equation of state and the Mukhopadhyay and Rao mixing
law.
doi:10.34984/SCFTP.2020.15.2.007
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ГОСТ
7.0.100-2018
Phase Equilibrium of the Binary System Propylene Glycol—Propane/Butane / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 2. – С. 79-86. - DOI: 10.34984/SCFTP.2020.15.2.007
TRANSLIT
Fazovoe ravnovesie binarnoj sistemy propilenglikol'—propan/butan / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 2. – S. 79-86. - DOI: 10.34984/SCFTP.2020.15.2.007
En
Phase Equilibrium of the Binary System Propylene Glycol—Propane/Butane. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 2, 79-86 (2020). https://doi.org/10.34984/SCFTP.2020.15.2.007
June 29—30, 2020, Arkhangelsk
Key words: sodium alginate, chitosan, supercritical drying, aerogel, interpolymer complex, furacilin
Composite aerogel materials based on the alginate-chitosan interpolyelectrolyte
complex with calcium carbonate using supercritical fluids were obtained. Aerogels have
developed mesoporous structure. The specific surface area of the samples is 400 m2g-1,
the average pore size is 19.3 nm, and the total pore volume is 1.93 cm3g-1. New
materials are superadsorbents. 1 g of aerogel retains 60 g of liquid while maintaining
its shape. The possibility of using the obtained composite aerogels to create wound
coatings with the inclusion of an antiseptic medicinal substance (furacilin) was
shown. It was found that for all samples of aerogels, the furacilin release profile from
the aerogel matrix corresponds to the dynamics of controlled release. It was shown
that within 5 hours there is almost complete release of furacilin (88—95 %) from the
aerogel matrix, which is due to the developed surface of the material.
doi:10.34984/SCFTP.2020.15.3.002
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ГОСТ
7.0.100-2018
The Formation of the Supramolecular Structure of the Composite Aerogels Based on Sodium Alginate and Chitosan / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 3. – С. 11-20. - DOI: 10.34984/SCFTP.2020.15.3.002
TRANSLIT
Formirovanie nadmolekulyarnoj struktury kompozicionnogo aerogelya na osnove al'ginata natriya i hitozana / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 3. – S. 11-20. - DOI: 10.34984/SCFTP.2020.15.3.002
En
The Formation of the Supramolecular Structure of the Composite Aerogels Based on Sodium Alginate and Chitosan. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 11-20 (2020). https://doi.org/10.34984/SCFTP.2020.15.3.002
Key words: bio-oil, conversion, transition metals, propanol-2, supercritical solvent
This paperis devoted to the study of the catalytic conversion of bio-oil obtained by the
pyrolysis of pine wood waste using supercritical propanol-2. The method proposed in
this work is suitable for the production of monoaromatics mixture from the pyrolysis
liquid. The oxygen removal degree was found to beca. 80 %.
doi:10.34984/SCFTP.2020.15.3.003
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ГОСТ
7.0.100-2018
Catalytic Conversion of Bio-Oil into Aromatics in the Medium of Supercritical Solvent / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 3. – С. 21-26. - DOI: 10.34984/SCFTP.2020.15.3.003
TRANSLIT
Kataliticheskaya konversiya bio-nefti v aromaticheskie soedineniya v srede sverhkriticheskogo propanola-2 / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 3. – S. 21-26. - DOI: 10.34984/SCFTP.2020.15.3.003
En
Catalytic Conversion of Bio-Oil into Aromatics in the Medium of Supercritical Solvent. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 21-26 (2020). https://doi.org/10.34984/SCFTP.2020.15.3.003
Key words: supercritical antis olvent preci pitation, carbon nanotubes, polymer composites
The possibility to obtain polyurethane—carbon nanotube composites using supercritical
antisolvent preci pitation (SAS) is demonstrated. The influence of solvent, polymer concentration
in the solution, spraying nozzle and suspension flow rate on composites
preparation efficiency and morphology is investigated.
doi:10.34984/SCFTP.2020.15.3.004
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ГОСТ
7.0.100-2018
Preparation of Polyurethane—Carbon Nanotube Composites Via Suspension Supercritical Antisolvent Precipitation / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 3. – С. 27-34. - DOI: 10.34984/SCFTP.2020.15.3.004
TRANSLIT
Poluchenie kompozitov poliuretan—uglerodnye nanotrubki metodom suspenzionnogo sverhkriticheskogo antisol'ventnogo osazhdeniya / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 3. – S. 27-34. - DOI: 10.34984/SCFTP.2020.15.3.004
En
Preparation of Polyurethane—Carbon Nanotube Composites Via Suspension Supercritical Antisolvent Precipitation. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 27-34 (2020). https://doi.org/10.34984/SCFTP.2020.15.3.004
Key words: carbon dioxide, supercritical condition, solvatochromic parameters, dyes, polarity, donor-acceptor properties, temperature, pressure
Kamlet—Taft solvatochromic polarity parameters are determined for carbon dioxide in
sub- and supercritical state at 22, 40, 60 and 80 °С and 10,0—30,0 MPa. As solvatochromic
indicators, 2,6-di phenyl-4-(2,4,6-triphenyl-1-pyridino)-phenolate (Reichardt’s betaine)
and benzophenone were used to determine ET, and to determine β and π parameters,
respectively, 4-nitrophenol and 4-nitroanisole were used. It was found that the values of
the parameters characterizing the polarity and donor-acceptor properties of CO2 are
practically independent of the state parameters, since these properties are determined by
the structure of the molecule.
doi:10.34984/SCFTP.2020.15.3.005
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ГОСТ
7.0.100-2018
Solvatochromic Polarity Parameters of Carbon Dioxide in Sub- and Supercritical State / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 3. – С. 35-40. - DOI: 10.34984/SCFTP.2020.15.3.005
TRANSLIT
Sol'vatohromnye parametry polyarnosti dioksida ugleroda v sub- i sverhkriticheskom sostoyanii / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 3. – S. 35-40. - DOI: 10.34984/SCFTP.2020.15.3.005
En
Solvatochromic Polarity Parameters of Carbon Dioxide in Sub- and Supercritical State. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 35-40 (2020). https://doi.org/10.34984/SCFTP.2020.15.3.005
Key words: heterogeneous catalysts, subcritical synthesis, hypercrosslinked polystyrene
The current paper is devoted to the study of the influence of temperature and pressure
of subcritical synthesis on the structure of polymeric supports and the composition of
the active phase of the synthesized catalysts. During the investigation, the optimal
synthesis conditions were chosen for the deposition of the metal-containing phase on
the surface of hypercrosslinked polystyrene.
doi:10.34984/SCFTP.2020.15.3.006
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ГОСТ
7.0.100-2018
Influence of Temperature and Pressure on the Structure of Polymeric Catalysts Synthesized in Subcritical Water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 3. – С. 41-48. - DOI: 10.34984/SCFTP.2020.15.3.006
TRANSLIT
Vliyanie temperatury i davleniya na strukturu polimernyh katalizatorov, sintezirovannyh v subkriticheskoj vode / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 3. – S. 41-48. - DOI: 10.34984/SCFTP.2020.15.3.006
En
Influence of Temperature and Pressure on the Structure of Polymeric Catalysts Synthesized in Subcritical Water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 41-48 (2020). https://doi.org/10.34984/SCFTP.2020.15.3.006
Key words: impregnation, polymethylmethacrylate, carbamazepine, supercritical CO2
In this work we performed an impregnation of polymethylmethacrylate with carbamazepine
in SC-CO2 medium. Impregnation was carried out at two temperatures of 75 °C and
105 °C and SC-CO2 density equal 1.3 of its critical value. In the first stage, in order to
define the kinetic parameters of CO2 sorption by polymer matrix, we applied high pressure
NMR spectroscopy. Two impregnated polymethylmethacrylate samples were obtained
upon impregnation process and further they were analyzed by Raman spectroscopy and
powder X-Ray diffraction.
Basing on the results of Raman spectroscopy we found that both impregnated samples
contain carbamazepine, at that its concentration in polymethylmethacrylate impregnated
at 105 °C is in ∼2.7 times higher than in polymethylmethacrylate processed at 75 °C. It
was also discovered that carbamazepine does not crystallize in the confinement of polymer
matrix. Its solution in polymethylmethacrylate is formed instead. Moreover, processing
temperature also affects on conformational state of carbamazepine molecules entrapped
into polymer matrix.
doi:10.34984/SCFTP.2020.15.3.007
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ГОСТ
7.0.100-2018
Impregnation of Polymethylmethacrylate with Carbamazepine in Supercritical Carbon Dioxide Medium / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2020. – Т. 15. – № 3. – С. 49-61. - DOI: 10.34984/SCFTP.2020.15.3.007
TRANSLIT
Impregnaciya polimetilmetakrilata karbamazepinom v srede sverhkriticheskogo dioksida ugleroda / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2020. – Т. 15. – № 3. – S. 49-61. - DOI: 10.34984/SCFTP.2020.15.3.007
En
Impregnation of Polymethylmethacrylate with Carbamazepine in Supercritical Carbon Dioxide Medium. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 49-61 (2020). https://doi.org/10.34984/SCFTP.2020.15.3.007