Regular Article – Flowing Matter
The Soret coefficients of the ternary system water/ethanol/triethylene glycol and its corresponding binary mixtures
Physikalisches Institut, Universität Bayreuth, 95440, Bayreuth, Germany
2 Universite de Pau et des Pays de l’Adour, E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Anglet, France
3 Mondragon Unibertsitatea, 20500, Arrasate-Mondragon, Spain
4 MRC, CP 165/62, Université libre de Bruxelles (ULB), 50, Ave. F.D. Roosevelt, B-1050, Brussels, Belgium
5 BRGM, Orléans, France
6 Ikerbasque, Basque Foundation for Science, Bilbao, Spain
Accepted: 2 October 2021
Published online: 18 October 2021
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.
© The Author(s) 2021
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