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Issue 15, 2011
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The Soret effect of mono-, di- and tri-glycols in ethanol

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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, DT 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.

Graphical abstract: The Soret effect of mono-, di- and tri-glycols in ethanol

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Publication details

The article was received on 04 Jan 2011, accepted on 18 Feb 2011 and first published on 16 Mar 2011


Article type: Paper
DOI: 10.1039/C1CP00022E
Citation: Phys. Chem. Chem. Phys., 2011,13, 7090-7094
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    The Soret effect of mono-, di- and tri-glycols in ethanol

    M. Klein and S. Wiegand, Phys. Chem. Chem. Phys., 2011, 13, 7090
    DOI: 10.1039/C1CP00022E

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