Puzenko Alexander, Hayashi Yoshihito, Ryabov Yaroslav E, Balin Igal, Feldman Yuri, Kaatze Udo, Behrends Ralph
Department of Applied Physics, The Hebrew University of Jerusalem, Givat Ram, 91904 Jerusalem, Israel.
J Phys Chem B. 2005 Mar 31;109(12):6031-5. doi: 10.1021/jp0445122.
We discuss the relaxation dynamics of glycerol-water mixtures, as studied by dielectric spectroscopy in the frequency range from 1 Hz to 250 MHz and at temperatures between 173 and 323 K. The experimental results obtained for the glycerol-rich mixtures suggest that the main dielectric relaxation process, as well as the so-called high-frequency "excess wing" (EW) and dc conductivity, follow the same temperature dependence. This result indicates that all of these processes are induced by the same molecular origin. A new phenomenological function is proposed to describe the whole dielectric spectrum in the covered frequency range, and some possible mechanisms of dielectric behaviors through the dc conductivity, the main relaxation process, and the EW are discussed.
我们讨论了甘油 - 水混合物的弛豫动力学，这是通过介电谱在1 Hz至250 MHz的频率范围内以及173至323 K的温度下进行研究的。对于富含甘油的混合物所获得的实验结果表明，主要的介电弛豫过程以及所谓的高频“过剩翼”（EW）和直流电导率遵循相同的温度依赖性。这一结果表明，所有这些过程都是由相同的分子起源引起的。提出了一种新的唯象函数来描述所涵盖频率范围内的整个介电谱，并讨论了通过直流电导率、主要弛豫过程和EW产生介电行为的一些可能机制。
