Studies on the Critical Micelle Concentration and Thermodynamic Properties of Mono(2-ethyl-hexyl)-2-ethyl-hexyl Phosphate Salts in Organic Solvent plus sec-Octyl Alcohol Systems at 298.15 K Using a Microcalorimetric Method

The power time curves of the micelle formation process were determined for quasi-surfactants [mono(2-ethyl-hexyl)-2-ethyl-hexyl phosphate nickel and mono(2-ethyl-hexyl)-2-ethyl-hexyl phosphate cadmium] and two kinds of solvent, n-chain alkalies (decane, dodecane, and tetradecane) and single-ring aromatic hydrocarbons (benzene. toluene. and dimethylbenzene) with sec-octyl alcohol by titration microcalorimetry The critical micelle concentration (cmc), aggregation number (n), formation constant of the micelle (K), and thermodynamic functions (Delta H-r(m)0 Delta(r)G(m)(0), and Delta S-r(m)0) are obtained For different quasi-surfactants and solvents, the relationships between the solvent properties with the cane and the thermodynamic functions of the surfactants are discussed