title: Ludwig-Soret effect of aqueous solutions of ethylene glycol oligomers, crown ethers, and glycerol: Temperature, molecular weight, and hydrogen bond effect.
abstract: 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.
authors.affiliation: Department of Physics, Tokai University, Hiratsuka, Kanagwa 259-1292, Japan.
authors.forename: Kousaku
authors.initials: K
authors.lastname: Maeda
authors.affiliation: Department of Physics, Tokai University, Hiratsuka, Kanagwa 259-1292, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Shinyashiki
authors.affiliation: Department of Physics, Tokai University, Hiratsuka, Kanagwa 259-1292, Japan.
authors.forename: Shin
authors.initials: S
authors.lastname: Yagihara
authors.affiliation: ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany and Department für Chemie - Physikalische Chemie, Universität zu Köln, 50939 Cologne, Germany.
authors.forename: Simone
authors.initials: S
authors.lastname: Wiegand
authors.affiliation: Department of Physics, Tokai University, Hiratsuka, Kanagwa 259-1292, Japan.
authors.forename: Rio
authors.initials: R
authors.lastname: Kita