2011
DOI: 10.1039/c1cp00022e
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The Soret effect of mono-, di- and tri-glycols in ethanol

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 t… Show more

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Cited by 13 publications
(16 citation statements)
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“…(7). The denominator is a pure equilibrium quantity that can be obtained from, e.g., suitable equations of state.…”
Section: Theorymentioning
confidence: 99%
“…(7). The denominator is a pure equilibrium quantity that can be obtained from, e.g., suitable equations of state.…”
Section: Theorymentioning
confidence: 99%
“…If the water content increases, which means the solvent quality improves, the system becomes more thermophobic and ethylene oxide oligomers and also PEO diffuses to the cold region. 11,13,19 This behavior could qualitatively be understood with a two-chamber lattice model for thermodiffusion in liquid mixtures and dilute polymer solutions. 21,22 The lattice model includes compressibility and directed hydrogen bonding between PEO and water molecules.…”
Section: Introductionmentioning
confidence: 92%
“…An already well-established behavior of polymers, both polar and non-polar, at infinite dilution is that the thermal diffusion coefficient D T becomes independent of molar mass for long enough chains. 19,24,25 Different analytical approaches have been so far employed to explain this behavior. [26][27][28] Yang and Ripoll 28 make use of a scaling argument and consider the relevance of the hydrodynamic interactions 29 for both the thermophoretic force (proportional to the Soret coefficient) and the friction coefficient.…”
Section: Figmentioning
confidence: 99%
See 1 more Smart Citation
“…In this study, we study the contributions of the molec-ular weight and hydrogen bonds on the temperature dependence of the Ludwig-Soret effect for aqueous solutions of ethylene glycol oligomers (EGOs), crown ethers (CEs), and glycerol by Thermal Diffusion Forced Rayleigh Scattering (TDFRS). The thermal diffusion of aqueous solutions of EGOs and poly(ethylene glycol)s has been studied experimentally by TDFRS and by the thermogravitational column method, [5][6][7]14,[28][29][30] . It is the only water soluble polymer for which the molecular weight dependence has been investigated systematically.…”
Section: Introductionmentioning
confidence: 99%