Broadband dielectric study on the water-concentration dependence of the primary and secondary processes for triethyleneglycol-water mixtures

Seiichi Sudo, Naoki Shinyashiki, Yuki Arima, and Shin Yagihara
Phys. Rev. E 78, 011501 – Published 16 July 2008

Abstract

Broadband dielectric measurements for triethyleneglycol (3EG)-water mixtures with various concentrations were performed in the frequency range of 10μHz10GHz and in the temperature range of 130298K. For each mixture, the separation of the primary (α) and secondary processes is observed below the crossover temperature, TC. In the case of 80100wt% 3EG-water mixtures, the Kohlrausch-Williams-Watts–type primary process above TC continues to the α process below TC, and an additional secondary process is observed in the frequency range higher than that of the α process below TC. On the other hand, the primary process for 65 and 70wt% 3EG-water mixtures above TC continues to the higher-frequency secondary process below TC, and an additional α 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 TC.

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  • Received 8 April 2008

DOI:https://doi.org/10.1103/PhysRevE.78.011501

©2008 American Physical Society

Authors & Affiliations

Seiichi Sudo1,*, Naoki Shinyashiki2, Yuki Arima2, and Shin Yagihara2

  • 1Departiment of Physics, Musashi Institute of Technology, Tamazutsumi, Setagaya, Tokyo 158-8557, Japan
  • 2Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan

  • *Corresponding author.

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Vol. 78, Iss. 1 — July 2008

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