Study of co-operative dynamics and thermo-dielectric parameters of n-butyl acetate-xylene solutions using dielectric spectroscopy

Abstract

Temperature and frequency dependent complex permittivity spectra (CPS) of n-Butyl Acetate (n-BA) with Xylene were measured in the range of 0.1<ν/GHz<50. Dielectric relaxation parameter was measured over a wide range of frequency that confers information regarding the dielectric dispersion, relaxation behavior, molecular dynamics, molecular association, and interfacial polarization. The least squares fit method has been used to obtain dielectric relaxation parameters which are obtained from an analysis of Debye relaxation process and is the time taken by relaxing molecules involved in dynamics, is explicated very well with cooperative domains (CDs) among n-BA-n-BA and n-BA-Xylene,which is being validated with the help of geff through bonding between them. Molecular relation in hydrogen bonding that causes variations in Kirkwood correlation value from unity is the measure of degree of short-range dipolar ordering.The Luzar model employed for n-BA Xylene mixtures to determine molecular association. Thermodynamic parameters have been obtained to get the information about molecular ordering.