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

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100 1 _ |a Maeda, Kousaku
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245 _ _ |a Ludwig-Soret effect of aqueous solutions of ethylene glycol oligomers, crown ethers, and glycerol: Temperature, molecular weight, and hydrogen bond effect
260 _ _ |a Melville, NY
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520 _ _ |a The thermal diffusion, also called the Ludwig-Soret effect, of aqueous solutions of ethylene glycol oligomers, crown ethers, and glycerol are investigated as a function of temperature by Thermal Diffusion Forced Rayleigh Scattering (TDFRS). The Soret coefficient, $S_{\rm{T}}$, and the thermal diffusion coefficient, $D_{\rm{T}}$, show a linear temperature dependence for all studied compounds in the investigated temperature range. The magnitudes and the slopes of $S_{\rm{T}}$ and $D_{\rm{T}}$ 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. $S_{\rm{T}}$ and $D_{\rm{T}}$ can be described by an empirical equation depending on the difference of donor minus acceptors sites and the molecular weight of the solute molecule.
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700 1 _ |a Shinyashiki, Naoki
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700 1 _ |a Yagihara, Shin
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700 1 _ |a Wiegand, Simone
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700 1 _ |a Kita, Rio
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773 _ _ |a 10.1063/1.4931115
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