Journal of Pure and Applied Ultrasonics

N. Jaya Madhuri ¹, J. Glory ¹, P. S. Naidu ¹, K. Ravindra Prasad ¹

Affiliations
1 Department of Physics, S.V.U.P.G. Centre, Kavali-524201, IN

Abstract

Six drugs belonging to one class which are used for reducing cough have been chosen for an ultrasonic study. These solutions have in them as major components-Chlorpheniramine maleate/diphenydramine hydrochloride/ambroxol hydrochloride/terbutalline sulphate/codeine phosphate/herbal syrup. Ultrasonic velocity and density have been measured in the aqueous solutions of these systems at 303.15K. Deviations in velocity and compressibility have been computed. Also the effect of these systems on the structure of water has been analysed employing Jacobson’s theory of adiabatic compressibilities.

Keywords

Ultrasonic Velocity, Adiabatic Compressibility, Jacobson’s Theory, Aqueous Solutions, Structural Properties.

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N. Jaya Madhuri ¹, J. Glory ¹, P. S. Naidu ¹, K. Ravindra Prasad ¹

Affiliations
1 Department of Physics, S. V. U. P. G. Center, Kavali-524201, Andhra Pradesh, IN

Abstract

Ultrasonic velocity and density have been measured in the binary mixtures of acetophenone and NN-dimethylformamide with benzyl benzoate as common component at three temperatures 30, 40 and 50°C. Adiabatic compressibility, free length, molar volume etc. have been calculated and the excess parameters of these are employed for estimating the molecular interactions in the mixed state. Mostly strong and dipole-dipole interactions are indicated in the acetophenone and dimethylformamide systems at all concentrations. In both the systems endothermic type of reactions is suggested. From a theoretical evaluation of velocities, CFT, NOMOTO and JUNJIE appear to have an edge.

Keywords

Ultrasonic Velocity, Compressibility, Benzyl Benzoate, Molecular Interactions, Binary Mixtures.

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P. Subramanyam Naidu ¹, K. Ravindra Prasad ¹

Affiliations
1 S.V.U. P.G. Centre, Kavali-524201 (AP), IN

Abstract

Ultrasonic velocity and density have been measured experimentally at 30°C in t-butanol+water system at low concentrations. To this aqueous t-butanol system, small quantities of potassium halides, KCl, KBr and KI have been added and the measurements repeated. From the velocity peaks and compressibility minima, the effect of potassium halides on the clathrate structures of aqueous t-butanol system has been studied. Also by computing apparent molar volumes and apparent molar compressibilities, ion-solvent, solute-solvent interactions are estimated in the total system.

Keywords

Potassium Halides, Ultrasonic Velocity, Apparent Molar Volumes, Compressibility, Solute-Solvent Interactions.

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M. Geeta Lakshmi ¹, P. S. Naidu ¹, K. Ravindra Prasad ¹

Affiliations
1 Department of Physics, SVU PG Centre, Kavali-524201 (AP), IN

Abstract

Ultrasonic velocity, density and viscosity have been measured in the binary mixtures of alcohols with benzyl benzoate as common component at 30°C. The thermodynamic and other related parameters like isentropic compressibility, free length, internal pressure, Gibb's activation energy etc. have been computed and their excess parameters are analyzed in the light of molecular interactions between the constituent molecules in the mixture. In all the three binary mixtures, strong molecular interactions between unlike molecules are predicted besides dipole-dipole interactions. In all the three mixtures endothermic reaction appears to be prevalent.

Keywords

Ultrasonic Velocity, Benzyl Benzoate, Alcohols, Binary Mixtures, Molecular Interactions, Internal Pressure.

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J. Siva Sankar ¹, M. Geeta Lakshmi ¹, P. S. Naidu ¹, K. Ravindra Prasad ¹

Affiliations
1 Department of Physics, S.V.U.P.G. Centre, Kavali-524 201 (A.P.), IN

Abstract

Ultrasonic velocity, density and viscosity have been measured experimentally in the two binary mixtures of benzyl benzoate in dichloromethane and iso-butanol at three temperatures 30,35 and 40°C over the entire composition range. The thermodynamic and other allied parameters like adiabatic compressibility, free length, internal pressure, enthalpy etc. have been computed and the variation of the excess parameters like excess compressibility, excess internal pressure, excess enthalpy, excess activation energy etc. is analyzed in the light of inter molecular interactions in the mixtures. In both the mixtures, strong intermolecular interactions between the constituent molecules are suggested.

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P. Subramanyam Naidu ¹, K. Ravindra Prasad ¹

Affiliations
1 Department of Physics, SVUPG Centre, Kavali-524201, IN

Abstract

Ultrasonic velocity, density and viscosity have been measured experimentally in solutions of fenvalerate and cypermethrin in the solvent hexane at four temperatures 30, 35, 40 and 50°C. Various acoustical and other related parameters like adiabatic compressibility, internal pressure, apparent molar compressibility and volume and solvation numbers have been computed and discussed in the light of molecular interactions-solute-solute and solute-solvent interactions in the solutions. In both the systems, solute-solvent interactions appear to be dominant.

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