The Soret coefficients of the ternary system water/ethanol/triethylene glycol and its corresponding binary mixtures.
Marcel Schraml,Henri Bataller,C. Bauer,M. Mounir Bou-Ali,Fabrizio Croccolo,Estela Lapeira,A. Mialdun,P. Möckel,A. T. Ndjaka,Valentina Shevtsova,Werner Köhler +10 more
TLDR
In this paper, ground-based measurements of the Soret coefficient along the binary borders of the Gibbs triangle of the highly polar and hydrogen bonding ternary DCMIX3-system water/ethanol/triethylene glycol are discussed.Abstract:
Thermodiffusion in ternary mixtures is considered prototypic for the Soret effect of truly multicomponent systems. We discuss ground-based measurements of the Soret coefficient along the binary borders of the Gibbs triangle of the highly polar and hydrogen bonding ternary DCMIX3-system water/ethanol/triethylene glycol. All three Soret coefficients decay with increasing concentration, irrespective of the choice of the independent component, and show a characteristic sign change as a function of temperature and/or composition. With the exception of triethylene glycol/ethanol at high temperatures, the minority component always migrates toward the cold side. All three binaries exhibit temperature-independent fixed points of the Soret coefficient. The decay of the Soret coefficient with concentration can be related to negative excess volumes of mixing. The sign changes of the Soret coefficients of the binaries allow to draw far-reaching conclusions about the signs of the Soret coefficients of the corresponding ternary mixtures. In particular, we show that at least one ternary composition must exist, where all three Soret coefficients vanish simultaneously and no steady-state separation is observable.read more
Citations
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Theory of cross phenomena and their coefficients beyond Onsager theorem
TL;DR: In this article , it was shown that the Onsager theorem is intrinsically diagonal when the driving forces are chosen from the gradients of potentials that drive the fluxes of their respective conjugate molar quantities, including the contributions from internal processes.
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Mass diffusion and Soret coefficient measurements of triethylene glycol/water binary mixtures by dynamic shadowgraphy
A. Ndjaka,L. García-Fernández,D. E. B. Bouyou,Arnault Lassin,Mohamed Azaroual,Fabrizio Croccolo,Henri Bataller +6 more
TL;DR: In this article , the authors apply the dynamic shadowgraphy optical technique to study non-equilibrium fluctuations induced by the presence of a gradient of temperature and/or concentration in the triethylene glycol (TEG)/water system.
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Nonlinearities in shadowgraphy experiments on non-equilibrium fluctuations in polymer solutions
TL;DR: In this article , a local model that treats the measured shadowgraph signal as a superposition of the contributions from every layer of the sample is able to capture the essential trend and yields a good agreement with experimental data.
Journal ArticleDOI
Nonlinearities in shadowgraphy experiments on non-equilibrium fluctuations in polymer solutions
TL;DR: In this article , a local model that treats the measured shadowgraph signal as a superposition of the contributions from every layer of the sample is able to capture the essential trend and yields a good agreement with experimental data.
Journal ArticleDOI
Soret effect on the onset of viscous dissipation thermal instability for Poiseuille flows in binary mixtures
TL;DR: In this paper , the Soret effect on the linear instability properties in convection due to viscous dissipation in a horizontal channel filled with a binary fluid mixture was investigated, and it was found that longitudinal rolls (LR) represent the preferred mode for the onset of convection.
References
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Optical measurement of the Soret coefficient of ethanol/water solutions
TL;DR: In this article, a laser-beam-deflection technique was employed to measure the Soret coefficient of ethanol/water solutions with ethanol weight fractions ranging from 0.02 to 0.39, over the temperature range 10 to 40
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Soret effect in interacting micellar solutions.
Roberto Piazza,Andrea Guarino +1 more
TL;DR: It is shown that electrostatic effects have a dramatic influence on thermal diffusion of charged micelles and that single-particle behavior can be explained using an interfacial tension mechanism proposed by Ruckenstein, which also fairly accounts for collective effects and opens the way to a general picture of thermal diffusion in disperse systems.
Journal ArticleDOI
The "macromolecular tourist": universal temperature dependence of thermal diffusion in aqueous colloidal suspensions
TL;DR: It is shown that thermophoresis (particle drift induced by thermal gradients) in aqueous solvents displays a distinctive universal dependence on temperature, strictly related to the solvent thermal expansivity.
Journal ArticleDOI
The Soret Effect in Liquid Mixtures – A Review
TL;DR: In this paper, a review of the Soret effect in binary and ternary liquid mixtures is presented, where the most important experimental techniques used nowadays are introduced and a modern development in studying thermal diffusion, the discovery of both integral and specific additivity laws, is discussed.
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Optical measurement of the Soret coefficient and the diffusion coefficient of liquid mixtures
TL;DR: In this paper, the bending of a laser beam propagating horizontally through a liquid mixture subjected to a temperature gradient in the vertical direction was observed, and the Soret coefficient was determined by measuring the dynamic response of the beam deflection.
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