Dielectric Relaxation in Ethylene Glycol - Dimethyl Sulfoxide Mixtures as a Function of Composition and Temperature

• DOI: 10.5012/jkcs.2012.56.4.416
• Publication Date: 2012-09-15T02:40:59Z
• Authors: P.B. Undre; P.W. Khirade; V.S. Rajenimbalkar; S.N. Helambe; S.C. Mehrotra
• Keywords: Debye–Hückel equation; Atmospheric temperature range

Using time domain reflectometry, the complex dielectric spectra between 10 MHz to 20 GHz has been measured in whole composition range at 10, 20, 30 and <TEX>$40^{\circ}C$</TEX> for binary mixtures of ethylene glycol dimethyl sulfoxide. For all mixtures, only one loss peak was observed this frequency range. The relaxation these can be described by a single using Debye model. A systematic variation is constant (<TEX>${\varepsilon}_0$</TEX>) (<TEX>${\tau}$</TEX>). excess permittivity (<TEX>${\varepsilon}^E$</TEX>), inverse <TEX>$(1/{\tau})^E$</TEX>, Kirkwood correlation factor (g) thermodynamic parameters viz. enthalpy activation (<TEX>${\Delta}H$</TEX>) Gibbs free energy (<TEX>${\Delta}G$</TEX>) have determined, confirm formation hydrogen bonded homogeneous heterogeneous cooperative domains, dynamics solute - interaction hindrance molecular rotation glass forming sulphoxide system.