Molecular interaction and dielectric relaxation study of DMSO-Water binary mixtures using a TDR

Abstract

Complex permittivity spectra (CPS) for dimethylsulphoxide (DMSO) - Water mixtures, in the frequency range of 10 MHz-30 GHz have been examined, which include the entire concentration range using a time domain reflectometry (TDR) method. The Cole - Davidson relaxation model was used to fit the CPS obtained from DMSO - Water mixtures. Mixture’s relaxation time obtained high at volume fraction of water, Vw=0.3. The study analyzed the intermolecular interactions using the Kirkwood correlation factor (KCF) and excess properties. The theoretical dielectric constant for mixtures was computed using Alenka Luzar's hydrogen bonding model using different molecular parameters.