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While studying thermo-acoustic properties of binary, ternary liquid mixtures or that of ferro-fluids, one not only need to measure the variation of acoustic parameters like acoustic impedance, hydration number, Rao's constant, Wada's constant, apparent molar volume, apparent molar isentropic compressibility at different temperature values but also need to see whether parameters like relative density, viscosity of the substance changes with change in temperature. This study is of utmost importance because while estimating the acoustic parameters sometimes relative density, sometimes viscosity and sometimes both of it appears in the formula. Electrical properties of the substances are also of similar importance. Hence, investigation of variation of viscosity, relative density of specific ferrofluids, with temperature is an important area of study. In this communication we have reported variation of viscosity, relative density of water based Zinc Spinel ferrite with temperature. The electrical properties of the water based Zinc Spinel ferrite are also reported. The study is carried out in the concentration range 0.001 M to 0.01 M. At concentration lower than 0.001 M, the behaviour of ferrofluids begins to deviate from the bulk fluid properties and as the concentration approaches 0.01 M, potential aggregation effects and saturation phenomena made the solution not to disperse as desired. The Zinc spinel ferrite is synthesized by sol-gel technique. [ABSTRACT FROM AUTHOR]

Thermo-acoustic study of binary and ternary mixtures has interesting results. In this communication we have reported interaction between niacin with alcohol-water and also in ethylene glycol medium. The densities and speed of sound for liquid solutions containing vitamin B3 (niacin) at discrete (0.03, 0.05, 0.07 and 0.09 mol·kg−1) concentrations in aqueous methanol and with ethylene glycol solvent at different temperatures have been measured by the help of multi-frequency ultrasonic interferometer. From volumetric experimental data "Wada's Constant (W), Rao's Constant (R), Vander Waal's constant (b), intermolecular free length (Lf), acoustic impedance (Z), apparent molar volume (Vɸ)" are calculated. The "apparent molar isentropic compression (Kɸ,s), hydration number (nH)" are calculated using experimental acoustic data. The inter and intra molecular interactions of niacin in liquid medium are reported in this communication. The solute-solvent interactions in the said binary and ternary mixtures are also discussed. [ABSTRACT FROM AUTHOR]