A ternary mixture at the border of Soret separation stability

Prokopev, Sergei; Lyubimova, Tatyana; Mialdun, Aliaksndr; Shevtsova, Valentina

doi:10.1039/d0cp06471h

Cited by 8 publications

(6 citation statements)

References 30 publications

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“…29 Based on these data, the first numerical study of this mixture was devoted to revealing the flow patterns in a gravitational field in the geometry of the Soret cell. 30 The analysis revealed motionless, metastable, and convective patterns depending on initial temperature of the system. This work presents experimental, numerical and analytical study of concentration and flow patterns and their stability in toluene (T)-methanol (M)-cyclohexane (Ch) mixture in the geometry of thermogravitational column.…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

“…The evolution of such a system was considered in the geometry of the Soret cell with different initial temperatures leading to several stationary patterns. 30 The pioneer results about the oscillatory instability were shortly presented in the letter. 32 Here, we provide a deep insight into the development and existence of oscillatory instability in a ternary mixture placed in a thermogravitational column.…”

Section: Introductionmentioning

confidence: 99%

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Cross diffusion governs an oscillatory instability in a ternary mixture with the Soret effect

Šeta

Errarte

Mialdun³

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Cross diffusion governs an oscillatory instability in a ternary mixture with the Soret effect

Šeta

Errarte

Mialdun³

et al. 2023

Phys. Chem. Chem. Phys.

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“…Recent studies have revealed many salient features of ternaries, such as the importance of the condition number for the optical contrast factor matrix 39,40 as well as the importance of cross-diffusion, which can lead to opposite signs of the Soret and thermodiffusion coefficients. 41 Still, there is a lack of studies, equally among binary and ternary mixtures, containing nanoparticles and, in particular, fullerene. Fullerene was discovered in 1985 while trying to understand how long carbon chains form in interstellar space.…”

Section: ■ Introductionmentioning

confidence: 99%

“…With the advent of convection-free microgravity environments, − the focus of research has strongly shifted toward ternary mixtures. Recent studies have revealed many salient features of ternaries, such as the importance of the condition number for the optical contrast factor matrix , as well as the importance of cross-diffusion, which can lead to opposite signs of the Soret and thermodiffusion coefficients …”

Section: Introductionmentioning

confidence: 99%

Thermophysical, Optical, and Mass Transport Properties of C₆₀ Fullerene Solutions in Toluene and Tetralin

et al. 2022

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We have measured isothermal and non-isothermal mass transport properties of fullerene C 60 in two different organic solvents, tetralin and toluene, and compared these measurements with the respective properties of the binary mixture of the pure solvents. In addition, a set of thermophysical and optical properties of the mixtures needed for extraction of the transport properties was measured and parameterized. Five different instruments used in this work for assessing the transport properties were extensively tested and benchmarked previously and have shown reliable and accurate results. The use of the instruments allowed us to provide the diffusion, thermodiffusion, and Soret coefficients at 298.15 K and normal pressure with an accuracy better than 5%. The hydrodynamic radii calculated from the diffusion coefficients agree with literature values for the fullerene radius, which proves the absence of fullerene aggregation in the studied mixtures. While the values of diffusion coefficients are within the range typical for molecular mixtures, the Soret coefficients are an order of magnitude higher and fall into the gap between ordinary molecular mixtures (S T < 10 −2 K −1 ) and colloids/nanofluids (S T > 10 −1 K −1 ).

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The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures

2023

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This review provides an overview of the major, currently used techniques for investigating the Soret effect and measuring thermodiffusion and Soret coefficients, and in most cases also isothermal Fickian diffusion coefficients, in liquid mixtures. The methods are introduced with a focus on binary mixtures. The optical methods comprise optical beam deflection (OBD), optical digital interferometry (ODI) both on the ground and under microgravity conditions in the SODI-IVIDIL experiment for the study of the influence of vibrations onboard the International Space Station, which are all based on Soret cells. The transient holographic grating technique of thermal diffusion-forced Rayleigh scattering (TDFRS) employs light not only for detection of the concentration changes but also for optical volume heating. Thermogravitational columns (TGC) utilize the coupling between convection and thermodiffusion to create concentration changes inside a vertical column with a horizontal temperature gradient. While samples are analyzed after extraction from the column in a classical setup, the recently developed transparent microcolumn allows for interferometric in situ monitoring of the concentration field. The most recent technique relies on the measurement of giant non-equilibrium fluctuations (NEFs) by small-angle light scattering techniques. Research on ternary mixtures, both on the ground and in microgravity, has gained momentum in the context of the DCMIX microgravity project of ESA. Most techniques employed for binaries can be extended to ternaries by introducing a second detection color or by analyzing both refractive index and density of extracted TGC samples. The accuracy is limited by the unavoidable inversion of the so-called contrast factor matrix.

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A ternary mixture at the border of Soret separation stability

Abstract: Ternary mixtures with the Soret effect are prone to triple-diffusive convection in a thermal field. The Soret coefficients of the toluene-methanol-cyclohexane mixture, measured in microgravity at a given composition [0.62-0.31-0.07]...

Cited by 8 publications

References 30 publications

Cross diffusion governs an oscillatory instability in a ternary mixture with the Soret effect

Cross diffusion governs an oscillatory instability in a ternary mixture with the Soret effect

Thermophysical, Optical, and Mass Transport Properties of C₆₀ Fullerene Solutions in Toluene and Tetralin

The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures

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A ternary mixture at the border of Soret separation stability

Abstract: Ternary mixtures with the Soret effect are prone to triple-diffusive convection in a thermal field. The Soret coefficients of the toluene-methanol-cyclohexane mixture, measured in microgravity at a given composition [0.62-0.31-0.07]...

Cited by 8 publications

References 30 publications

Cross diffusion governs an oscillatory instability in a ternary mixture with the Soret effect

Cross diffusion governs an oscillatory instability in a ternary mixture with the Soret effect

Thermophysical, Optical, and Mass Transport Properties of C60 Fullerene Solutions in Toluene and Tetralin

The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures

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Thermophysical, Optical, and Mass Transport Properties of C₆₀ Fullerene Solutions in Toluene and Tetralin