Dielectric spectroscopic study of the binary mixtures of amino silicone oil and methyl ethyl ketone in the frequency range of 100 Hz to 2 MHz at 298.15 K temperature

• Published in: Journal of molecular liquids 2018-12, Vol.271, p.686-695
• Main Authors: Rana, V.A., Shah, K.N., Vankar, H.P., Trivedi, C.M.
• Format: Article
• Language: English
• Subjects: Amino silicone oil; Complex impedance; Complex permittivity; Electrode polarization; Methyl ethyl ketone; Precision LCR meter
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2018.09.041

Complex dielectric function ε⁎(ω) = ε′(ω) − ε″(ω) of the binary mixtures of amino silicone oil and methyl ethyl ketone were measured using precision LCR meter in the frequency range 100 Hz to 2 MHz at 298.15 K temperature. Complex dielectric function data are represented in different formalisms like complex a.c. conductivity σ⁎(ω), complex modulus M⁎(ω) and complex impedance Z⁎(ω). The refractive index of the same system was determined at 298.15 K temperature using Abbe's refractometer. These presentations are used to find out different parameters such as electrode polarization relaxation time (τEP), relaxation time (τEP′), ionic conduction relaxation time (τσ), dc conductivity (σdc) and static permittivity (ε0) of the liquid samples. Determined parameters are used to gain information about the effect of concentration variation on dielectric and electrical properties of the mixtures. Complex impedance Z⁎(ω) data were fitted to an equivalent circuit, having four elements including capacitance (C2) representing electrode double layer capacitance. The geometric relaxation time was calculated using product of resistor (R2) and capacitor (C1) of the equivalent circuit. Lower frequency dielectric data is dominated by the EP effect. The systematic change is observed in all the parameters with change in concentration of amino silicone oil in methyl ethyl ketone. Viscosity dependence of dc conductivity of the system is also investigated. [Display omitted] •Complex permittivity data of ASO-MEK mixtures fit well to Coelho model.•Relaxation dynamics of all mixtures are in between the parent compounds.•Dielectric, electrical properties of mixture show strong concentration dependence.•dc conductivity and viscosity show inverse proportionality relationship.•Dynamical process of EDL phenomenon is independent of mixture concentration.