Supercritical fluids in chemistry

Алексеев, Е. С.; Alentiev, A. Yu.; Belova, Anastasia S.; Богдан, В. И.; Богдан, Т. В.; Bystrova, A. V.; Gafarova, Elvira R.; Голубева, Е. Н.; Grebenik, Ekaterina A.; Gromov, Oleg I.; Davankov, V. A.; Zlotin, Sergei G.; Киселев, М. Г.; Koklin, A. E.; Kononevich, Yuriy N.; Lazhko, A. E.; Лунин, В. В.; Lyubimov, S. E.; Martyanov, Oleg N.; Mishanin, Igor I.; Музафаров, А. М.; Nesterov, N. S.; Nikolaev, A. Yu.; Oparin, R. D.; Паренаго, О. О.; Parenago, O. P.; Pokusaeva, Yana A.; Ronova, I. A.; Solovieva, Anna B.; Temnikov, Maxim N.; Timashev, Peter; Turova, O. V.; Filatova, Evgeniya; Philippov, Alexey A.; Shalygin, A. S.

doi:10.1070/rcr4932

Cited by 75 publications

(26 citation statements)

References 1,071 publications

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“…The Electron paramagnetic resonance (EPR) measurements were carried out using a highpressure system, previously described in detail [51,82,83]. The system consists of a custommade polyetheretherketone (PEEK brand ZX-324, 'Wolf-Kunststoff-Gleitlager GmbH', Kerpen, Germany) tube (d inner = 1.6 mm) with a stainless steel head (V inner = 1.6 cm 3 ), connected by a stainless steel capillary (inner diameter 0.8 mm) and high-pressure valves ('Hy-Lok', Busan, Republic of Korea) to an auxiliary vessel (V inner = 49.2 cm 3 ) (Figure 2).…”

Section: Measurement Of Polymer Impregnation Kinetics Using Epr Spectroscopymentioning

confidence: 99%

“…EPR makes it possible to evaluate the mobility of a probe on multiple spatial scales [ 50 ]: rotational mobility is readily obtained from the shape of the EPR spectrum, molecular-scale translational mobility (<10 nm path) can be obtained by exchange interaction rate measurement, and, finally, EPR imaging and probe uptake measurement deliver macroscopic diffusivity. High-pressure/in situ EPR spectroscopy uses equipment similar to that of high-pressure NMR [ 51 ], and has been used so far to evaluate density enhancement and exchange reactions in SCFs [ 52 , 53 , 54 , 55 , 56 , 57 ], clustering of the solute in SCFs [ 58 , 59 , 60 , 61 , 62 ], microemulsion formation [ 63 , 64 ], and glass transition pressure in polylactide and polylactide-co-glycolide subjected to subcritical CO 2 [ 48 ]. In addition, it has been reported that the mobility of spin probes can reflect the distribution of free volume in polymers plasticized by subcritical CO 2 , similar to a conventional plasticizer [ 49 ].…”

Section: Introductionmentioning

confidence: 99%

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Solute Diffusion into Polymer Swollen by Supercritical CO2 by High-Pressure Electron Paramagnetic Resonance Spectroscopy and Chromatography

et al. 2021

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High-pressure electron paramagnetic resonance (EPR) was used to measure translational diffusion coefficients (Dtr) of a TEMPONE spin probe in poly(D,L-lactide) (PDLLA) and swollen in supercritical CO2. Dtr was measured on two scales: macroscopic scale (>1 μm), by measuring spin probe uptake by the sample; and microscopic scale (<10 nm), by using concentration-dependent spectrum broadening. Both methods yield similar translational diffusion coefficients (in the range 5–10 × 10−12 m2/s at 40–60 °C and 8–10 MPa). Swollen PDLLA was found to be homogeneous on the nanometer scale, although the TEMPONE spin probe in the polymer exhibited higher rotational mobility (τcorr = 6 × 10−11 s) than expected, based on its Dtr. To measure distribution coefficients of the solute between the swollen polymer and the supercritical medium, supercritical chromatography with sampling directly from the high-pressure vessel was used. A distinct difference between powder and bulk polymer samples was only observed at the start of the impregnation process.

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Section: Measurement Of Polymer Impregnation Kinetics Using Epr Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solute Diffusion into Polymer Swollen by Supercritical CO2 by High-Pressure Electron Paramagnetic Resonance Spectroscopy and Chromatography

et al. 2021

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“…Para além do processamento de materiais, o potencial da tecnologia supercrítica usando o CO 2 tem sido também explorado em diversas reações químicas, entre as quais, reações de catálise heterogénea, hidrogenações, oxidações e reações enantiosseletivas [16].…”

Section: Scco 2 Na Síntese Químicaunclassified

Dióxido de Carbono Supercrítico: Uma Alternativa para uma Síntese Mais Sustentável

Pires¹

2021

BSPQuimica

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In addition to being thermodynamically stable, chemically inert under many conditions, non-toxic and non-flammable, carbon dioxide has unique properties that make it very suitable to be used as a supercritical fluid. During the past few years, several reactions have been explored using the properties of supercritical CO 2 (scCO 2 ). In this article, not only the advantages of using scCO 2 will be presented, but also some reactions where scCO 2 has been explored as sustainable alternative synthetic route.

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“…In recent decades, there has been a growing interest in compressed gas media as new solvents for chemical reactions, including condensed gases and supercritical fluids [26][27][28][29]. The main advantages of these media include the possibility of adjusting their dissolving capacity and their instant removal from the reaction media.…”

Section: Introductionmentioning

confidence: 99%

A Versatile Equilibrium Method for the Synthesis of High-Strength, Ladder-like Polyphenylsilsesquioxanes with Finely Tunable Molecular Parameters

et al. 2021

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A versatile equilibrium method for synthesizing ladder-like polyphenylsilsesquioxanes (L-PPSQs) with various molecular weights (from 4 to 500 kDa) in liquid ammonia was developed. The effect of diverse parameters, such as temperature, monomer concentration, reaction time, addition or removal of water from the reaction medium, on the polycondensation process was determined. The molecular weight characteristics and structure of the L-PPSQ elements obtained were determined by GPC, 1H, 29Si NMR, IR spectroscopy, viscometry, and PXRD methods. The physicochemical properties of L-PPSQs were determined by TGA and mechanical analyses.

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Supercritical fluids in chemistry

Cited by 75 publications

References 1,071 publications

Solute Diffusion into Polymer Swollen by Supercritical CO2 by High-Pressure Electron Paramagnetic Resonance Spectroscopy and Chromatography

Solute Diffusion into Polymer Swollen by Supercritical CO2 by High-Pressure Electron Paramagnetic Resonance Spectroscopy and Chromatography

Dióxido de Carbono Supercrítico: Uma Alternativa para uma Síntese Mais Sustentável

A Versatile Equilibrium Method for the Synthesis of High-Strength, Ladder-like Polyphenylsilsesquioxanes with Finely Tunable Molecular Parameters

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