Maeda Kousaku, Shinyashiki Naoki, Yagihara Shin, Wiegand Simone, Kita Rio
Department of Physics, Tokai University, Hiratsuka, Kanagwa 259-1292, Japan.
ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany and Department für Chemie - Physikalische Chemie, Universität zu Köln, 50939 Cologne, Germany.
J Chem Phys. 2015 Sep 28;143(12):124504. doi: 10.1063/1.4931115.
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.
通过热扩散强迫瑞利散射研究了乙二醇低聚物、冠醚和甘油水溶液的热扩散（也称为路德维希-索雷特效应）与温度的关系。在所研究的温度范围内，索雷特系数ST和热扩散系数DT对所有研究的化合物均呈现线性温度依赖性。ST和DT的大小及斜率随溶质分子的化学结构而变化。所有研究的分子都含有醚基和/或羟基，它们分别可以作为受体或供体形成氢键。通过引入每个溶质分子的供体和受体位点数量，可以表达它们的氢键能力。ST和DT可以用一个经验方程来描述，该方程取决于供体位点减去受体位点的差值以及溶质分子的分子量。
