Journal of Pure and Applied Ultrasonics

K. Rajagopal ¹, S. S. Jayabalakrishnan ²

Affiliations
1 Department of Physics, Govt. Engg. College, Thirunelveli-627007, Tamil Nadu, IN
2 Department of Physics, P.S.R. Engg. College, Sivakasi, IN

Abstract

N, N-Dimethylimidodicarbonimidic Diamide Hydrochloride (Metformin hydrochloride) has been widely used for management of non-insulin dependent diabetes mellitus. In this paper we present the result of ultra sonic velocity, density, viscosity of aqueous metformin hydrochloride solution and methanol-metformin hydrochloride solution for different concentration at T=303.15K. The variations in ultrasonic velocity and internal pressure play a significant role in understanding the solute-solvent, intra and inter molecular interactions. Further the acoustical relaxation time, acoustical impedance, internal pressure, free volume, enthalpy, inter molecular free length, Rao's constant, Wada's constant are computed. Hydrogen bonding and molecular interaction in the solutions are analyzed on the basis of viscometric, volumetric and acoustical data.

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K. Rajagopal ¹, S. Edwin Gladson ²

Affiliations
1 Department of Physics, Government College of Engg., Tirunelveli-627007, Tamilnadu, IN
2 Department of Physics, St. Xavier's Catholic College of Engg., Chunkankadai-629807, Tamilnadu, IN

Abstract

Viscosity, density and ultrasonic data for sodium carbonate in L-Histidine water mixtures at different concentrations have been reported at 303.15K. The viscosity data have been analysed using the Jones-Dole equation. Apparent molar volumes, apparent molar compressibilities, limiting partial molar volumes, limiting partial molar compressibilities, transfer volumes have been calculated. All these parameters have been used to interpret the structure making or breaking capacities of sodium carbonates in L-Histidine water solutions.

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S. Prabakar ¹, K. Rajagopal ²

Affiliations
1 Department of Physics, IRT Polytechnic College, Tirunelveli-627007, IN
2 Department of Physics, Govt. College of Engineering, Tirunelveli-627007, Tamil Nadu, IN

Abstract

Ultrasonic velocity and density for binary liquid mixtures of acetone+acetophenone, ethyl methyl ketone+acetophenone and acetone + ethyl methyl ketone have been measured at 308 K over the entire molar concentration range. From these measured parameters, adiabatic compressibility (K_S), inter molecular free length (L_f) acoustic impedance (Z), relative association (R_A) and excess adiabatic compressibility (K_S^E) along with excess intermodular free length (L^E_f) have been calculated. The thermodynamic parameters and their excess values are used to account for the molecular interactions taking place between the components of the mixtures. Further the experimental ultrasonic sound velocities of all these binary systems are compared with those evaluated theoretically from empirical, semi empirical and statistical models. The validity of these models is also checked and a comparative study of the various theories is made for these systems.

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S. Anuradha ¹, S. Prema ², K. Rajagopal ³

Affiliations
1 Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, IN
2 Department of Physics, Rose Mary College for Women, Tirunelveli, IN
3 Department of Physics, Govt. College of Engg., Tirunelveli-627007, Tamil Nadu, IN

Abstract

Densities and ultrasonic velocities have been measured at 299K for the binary mixtures of acetonitrile (ACN) with acetone/ethyl methyl ketone/Methyl isobutyl ketone and acetophenone over entire composition range. From these, isentropic compressibility (K_S), intermolecular free length (L_f) and their deviations namely excess isentropic compressibility (L^S_E) and excess inter molecular freelength (L^E_F) have been calculated and interpreted in terms of inter molecular interactions. Further theoretical values of ultrasonic velocity in the four binary liquid mixtures are calculated using two different theoretical models. The relative merits of these theories and relations have been discussed.

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