Low temperature dielectric relaxation study of aqueous solutions of diethylsulfoxide
Department of Physical Chemistry, Yerevan State University, 0025, Yerevan, Armenia
2 Experimental Physics V, University of Augsburg, 86135, Augsburg, Germany
* e-mail: email@example.com
Accepted: 10 October 2014
Published online: 13 November 2014
In the present work, dielectric spectra of mixtures of diethylsulfoxide (DESO) and water are presented, covering a concentration range of 0.2-0.3 molar fraction of DESO. The measurements were performed at frequencies between 1Hz and 10MHz and for temperatures between 150 and 300K. It is shown that DESO/water mixtures have strong glass-forming abilities. The permittivity spectra in these mixtures reveal a single relaxation process. It can be described by the Havriliak-Negami relaxation function and its relaxation times follow the Vogel-Fulcher-Tammann law, thus showing the typical signatures of glassy dynamics. The concentration dependence of the relaxation parameters, like fragility, broadening, and glass temperature, are discussed in detail.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2014