Interaction between cationic and anionic surfactant using ultrasonic, physical and adiabatic parameters

Abstract

Surfactants are organic amphiphilic molecules having hydrophilic and hydrophobic parts in the same molecule. The relative densities, relative viscosities, specific conductance and ultrasonic velocity of sound of binary solutions of SDSCTAB in water, formed in different mole fraction ratios, have been measured at 298 K and 308 K. From these data, the physical parameters such as adiabatic compressibility (βad), intermolecular free length (Lf), acoustic impedance (Z), relaxation time (τ) and molar free volume (Vf) have been evaluated using standard relations. The results are thus interpreted in terms of molecular interactions between cationic and anionic surfactants. Investigated value of physical properties thus defines that the molecular interaction is feasible and associative in nature and the determined acoustical and adiabatic parameters supports that nature.