Journal of Pure and Applied Ultrasonics

G. Sudar Mozhi ¹, K. Ramanathan ²

Affiliations
1 Department of Physics, Muthayammal Engineering College, Rasipuram, Tamil Nadu, IN
2 Department of Physics, Thiyagarajar College of Engineering, Madurai, Tamil Nadu, IN

Abstract

In this study the Ultrasonic velocity and density of different proportionate mixture of Lithium Hydroxide (LiOH) and Lithium Sulphate (Li₂SO₄) are determined in the frequency range of 3MHz at room temperature using ultrasonic interferometer technique. With the values of velocity and density, the parameters like adiabatic compressibility, inter molecular free length, acoustical impedance, molar sound velocity, molar compressibility and molar volume have been calculated. It is observed that there is a complex nature of the mixture at a particular definite concentration.

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S. Ravichandran ¹, K. Ramanathan ²

Affiliations
1 Department of Physics, Sathyabama University, Chennai-115, IN
2 Department of Physics, Thiagarajar College, Madurai-15, IN

Abstract

The Ultrasonic velocities, Density and viscosity of cholesterol in chloroform solutions for varying concentrations have been measured at 294 K. From these data, Isentropic compressibility (K_s), Intermolecular free length (L_f), Molar volume (V), Molar sound velocity(R), Molar compressibility (W), Relaxation time (t), Relative association (R_A), Free volume (V_f) and Degree of molecular interactions (α) have been calculated. These parameters are used, to explain the nature of interaction between the chloroform and cholesterol molecules of the mixtures. The variation of ultrasonic velocity shows a dip at a concentration of 9%. It is observed that the complex formation between unlike molecules occurs at the concentration of 8% and 9%. Sound velocities were evaluated based on Free Length theory and Nomoto's relation and gives good agreement with the experimental values for the system studied. Non-ideality in the liquid mixtures has been discussed in terms of U²_exp/U²_imix where U_expand U_imix are the experimental and ideal mixture velocities respectively.

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K. Ramanathan ¹, S. Ravichandran ²

Affiliations
1 Department of Physics, Thiayagarajar College of Engineering, Madurai-15, IN
2 Department of Physics, Mahendra Engineering College, Mallasamudram, Namakkal District, Tamil Nadu, IN

Abstract

Ultrasonic study of mixture of ammonium sulphate and ammonium chloride in water at different concentrations have been carried out at a frequency of 2 MHz and at 303 K. Using the ultrasonic velocity and density, adiabatic compressibility, intermolecular free length, acoustic impedance have been calculated. The graph between ultrasonic velocity (U) and mole fraction (C_m) of ammonium sulphate in the mixed solution shows dips at a composition of 60:40 . The observed variations with different composition of the mixture are discussed.

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