Journal Article

PreJuSER-15469

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Soret effect of mono-, di- and tri-glycols in ethanol

Klein, M.FZJ* ; Wiegand, S.FZJ*

2011
RSC Publ. Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/4626  doi:10.1039/c1cp00022e

Abstract: We employed thermal diffusion forced Rayleigh scattering (TDFRS) to investigate the chain length dependence of the thermal diffusion behavior of short glycols in ethanol. We studied three glycols, monoethylenglycol (MEG), diethylenglycol (DEG) and triethylenglycol (TEG), in an ethanol solution. In contrast to the polymer polyethylenglycol, the shorter glycols used within the framework of this study are completely soluble in ethanol, at least for low molar fractions. In order to guarantee a good solubility of the glycols, the measurements were limited to molar fractions of 10% and 20%. As the different glycols only differ by their chain length it will be possible to deduce its influence on the thermal diffusion properties. Due to the fairly short persistence length of the glycols, D(T) reaches already for the dimer a plateau value. This finding agrees with simulation results. Furthermore, the thermal expansion and the kinematic viscosity are measured to investigate if empirical correlations seen for other systems could be confirmed.

Keyword(s): J

Note: We would like to thank Pablo Blanco and Bastian Arlt for many fruitful discussions and Hartmut Kriegs for technical support. Financial support due to the Deutsche Forschungsgemeinschaft grant Wi 1684 is gratefully acknowledged.

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)

Appears in the scientific report 2011

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