Faculty Publications
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Item Volumetric, acoustic, and refractometric study of cyclic alanylalanine in aqueous cobalt chloride solutions at temperatures T = (293.15 to 313.15) K(2013) Karanth, V.R.; Bhat, D.K.Density, refractive index, and speed of sound values of cyclic alanylalanine + aqueous CoCl2 systems have been reported as a function of concentrations of cyclic alanylalanine and that of CoCl2 at temperatures T = (293.15, 298.15, 303.15, 308.15, and 313.15) K. The values of partial molar volumes, isentropic compressibilities, and partial molar isentropic compressibilities of the cyclic alanylalanine + aqueous CoCl 2 systems have been calculated from the speed of sound and density data obtained from the experiment at various temperatures. The decreasing value of isentropic compressibility with respect to the molal concentration of cyclic alanylalanine and temperature indicated the presence of strong solute-solvent interaction operative in the present system. The variations in partial molar volumes as well as partial molar isentropic compressibilities have been discussed in terms of ionic, hydrophilic, and hydrophobic interactions present in the system. © 2013 American Chemical Society.Item Partial molar volume and partial molar isentropic compressibility study of glycine betaine in aqueous and aqueous KCl or MgCl2 solutions at temperatures T = 288.15-318.15 K(2013) Karanth, V.R.; Bhat, D.K.Partial molar volume, ?v0, isentropic compressibility, ?s, and partial molar isentropic compressibility, ?k0 of glycine betaine in aqueous and aqueous KCl or MgCl2 solutions have been computed using the experimental density and speed of sound data at temperatures, T = 288.15-318.15 K. The transfer partial molar volumes, ?tr?v0, and transfer partial molar isentropic compressibilities, ?tr?k0, have also been evaluated using the experimental data. The partial molar volumes of glycine betaine were computed using the usual equation as well as the equation employed by Pitkänen et al. So obtained values have been compared with literature values. The variations in experimental and computed parameters have been discussed in terms of solute-solvent and solute-solute interactions. © 2013 Elsevier B.V. All rights reserved.Item Partial molar volumes and compressibilities of glycine betaine in aqueous NaCl solutions at temperatures T=(288.15-318.15)K(Elsevier, 2014) Karanth, V.R.; Bhat, D.The partial molar volumes, partial molar isentropic compressibilities, transfer molar volumes and transfer molar isentropic compressibilities of the system: glycine betaine in aqueous (0.1, 0.2, 0.3, 0.4 and 0.5molkg-1) NaCl solutions at different temperatures were determined using the experimental values of density and speed of sound. The positive transfer molar volumes of the systems indicated the presence of strong solute-solvent interactions. The electrostatic charge-charge interactions (among Na+/Cl- ions and amino/carboxylic groups of glycine betaine) were found to be predominant over the ionic-hydrophobic interactions (among Na+/Cl- ions and CH2/CH3 groups of the glycine betaine) in aqueous solutions. Size of the metal ion was found to influence the volumetric properties to an appreciable extent. © 2014 Elsevier B.V.