Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Density q, sound velocity u, viscosity g, apparent molar volume V/, isentropic compressibility js , and apparent molar isentropic compressibility js;/ of glycine, L-alanine and L-phenylalanine: (0.05 to 0.15 mol kg 1) with water, 0.002 mol kg 1 aqueous methyltrioctylammonium chloride (MTOAC) and cetylpyridinium chloride (CPC) are reported at T = (293.15, 298.15, 303.15 and 308.15) K. The data were regressed against composition and regression constants: apparent molar volume at infinite dilution V0 /, apparent molar isentropic compressibility at infinite dilution j0s ;/ and viscosity B-coefficient are studied. Surface tension c and friccohesity r data were calculated from density, pendant drop number and viscous flow time. The V0 / values are found as V0 /ogly;l phal with waterP less than V0 /ogly;l phal with surfactatntP , V0 /ol ala with surfactatntP less than V0 /ol ala with waterP and j0s ;/ values as j0 /ogly;l phal with waterP less than j0 /ogly;l phal with surfactatntP , j0 /ol ala with surfactatntP less than j0 /ol ala with waterP . Surface tension of the solvents are found as water greater than CPC greater than MTOAC. Amino acids with surfactants have produced higher friccohesity than with water whereas the friccohesityof amino acids with water and surfactants is found as L-phal greater than L-Ala greater than gly over the entire temperature range but with CPC at T = 298.15 K, the order is L-phal greater than gly greater than L-Ala. The variations in physicochemical data with temperature and composition inferred structural changes with stronger solute solvent interactions.