Ultrasonic study for the molecular interactions of the ternary liquid mixture of p-anisaldehyde (4-methoxy benzaldehyde) with dimethylamine (N-methylmethanamine) and n-hexane at various temperatures

The thermo-physical parameters like density (ρ), ultrasonic velocity (u) and viscosity (η) have been experimentally measured for the ternary liquid mixture of para-anisaldehyde (4-methoxy benzaldehyde) in n-Hexane solution with dimethylamine at various temperatures such as 303 K, 308 K and 313 K and at fixed frequency of 2 MHz. The thermodynamic and acoustical parameters such as adiabatic compressibility (β), internal pressure (πi), cohesive energy (CE), free volume (Vf), free length (Lf), acoustic impedance (z), viscous relaxation time, Lennard Jones potential (LJP), and K value have been calculated from the experimental data. The various excess properties including excess acoustic impedance (ZE), excess free length ( , excess adiabatic compressibility (βE), excess free volume (VfE), excess ultrasonic velocity (UE) and excess internal pressure (πiE) have also been computed from the calculated values. The values of , ZE, and  for each mixture have been fitted to the Redlich –Kister polynomial equation. The variation of these parameters with respect to different concentration at different temperatures for the ternary system of para-anisaldehyde + dimethylamine + n-hexane has been studied in accordance with their strength of molecular interaction under the influence of ultrasonic wave of frequency 2 MHz.