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The Soret coefficients of the ternary system water/ethanol/triethylene glycol and its corresponding binary mixtures

Title data

Schraml, Marcel ; Bataller, Henri ; Bauer, C. ; Bou-Ali, M. M. ; Croccolo, Fabrizio ; Lapeira, E. ; Mialdun, A. ; Möckel, P. ; Ndjaka, A. T. ; Shevtsova, V. ; Köhler, Werner:
The Soret coefficients of the ternary system water/ethanol/triethylene glycol and its corresponding binary mixtures.
In: The European physical journal E. Vol. 44 (18 October 2021) . - No. 128.
ISSN 1292-895X
DOI: https://doi.org/10.1140/epje/s10189-021-00134-6

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics IV > Professor Experimental Physics IV - Univ.-Prof. Dr. Werner Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics IV
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 26 Mar 2022 22:00
Last Modified: 09 May 2022 09:20
URI: https://eref.uni-bayreuth.de/id/eprint/69044