Ludwig-Soret effect of aqueous solutions of ethylene glycol oligomers, crown ethers, and glycerol: Temperature, molecular weight, and hydrogen bond effect

The thermal diffusion, also called the Ludwig-Soret effect, of aqueous solutions of ethylene glycol oligomers, crown ethers, and glycerol is investigated as a function of temperature by thermal diffusion forced Rayleigh scattering. The Soret coefficient, ST, and the thermal diffusion coefficient, DT...

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Bibliographic Details
Published in:The Journal of chemical physics 2015-09, Vol.143 (12), p.124504-124504
Main Authors: Maeda, Kousaku, Shinyashiki, Naoki, Yagihara, Shin, Wiegand, Simone, Kita, Rio
Format: Article
Language:English
Subjects:
Aqueous solutions
Crown ethers
Diffusion coefficient
Diffusion effects
Empirical equations
Ethers
Ethylene glycol
Glycerol
Hydrogen bonds
Hydroxyl groups
Molecular structure
Molecular weight
Oligomers
Organic chemistry
Rayleigh scattering
Soret coefficient
Temperature dependence
Thermal diffusion
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Summary:The thermal diffusion, also called the Ludwig-Soret effect, of aqueous solutions of ethylene glycol oligomers, crown ethers, and glycerol is investigated as a function of temperature by thermal diffusion forced Rayleigh scattering. The Soret coefficient, ST, and the thermal diffusion coefficient, DT, show a linear temperature dependence for all studied compounds in the investigated temperature range. The magnitudes and the slopes of ST and DT vary with the chemical structure of the solute molecules. All studied molecules contain ether and/or hydroxyl groups, which can act as acceptor or donor to form hydrogen bonds, respectively. By introducing the number of donor and acceptor sites of each solute molecule, we can express their hydrogen bond capability. ST and DT can be described by an empirical equation depending on the difference of donor minus acceptor sites and the molecular weight of the solute molecule.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4931115