Abstract
Broadband dielectric measurements for triethyleneglycol (3EG)-water mixtures with various concentrations were performed in the frequency range of and in the temperature range of . For each mixture, the separation of the primary and secondary processes is observed below the crossover temperature, . In the case of 3EG-water mixtures, the Kohlrausch-Williams-Watts–type primary process above continues to the process below , and an additional secondary process is observed in the frequency range higher than that of the process below . On the other hand, the primary process for 65 and 3EG-water mixtures above continues to the higher-frequency secondary process below , and an additional process appears at a frequency lower than that of the secondary process. The contribution of water to relaxation processes is discussed, to clarify the molecular mechanism of the separation behavior. The characteristic separation behavior of the relaxation processes for high-water-content 3EG-water mixtures is due to the existence of excess water, which cannot move cooperatively with solute 3EG molecules below .
- Received 8 April 2008
DOI:https://doi.org/10.1103/PhysRevE.78.011501
©2008 American Physical Society