Interactions of proline in non-aqueous anionic, cationic and nonionic surfactants at different temperatures

Density and viscosity data of proline (Pro) in sodium dodecyl sulfate/cetyltrimethylammonium bromide/ poly (oxyethylene) isooctyl phenyl ether in formamide were measured at 298.15, 303.1.5, 308.15, and 313.15 K and 0.1 MPa. The density data were utilized to evaluate standard partial molar volumes (phi(0)(v)) and partial molar isobaric expansibility (phi(0)(E) ). The viscosity data were used to evaluate A- and B-coefficients, free energy of activation of viscous flow (Delta mu(1)0*) and (Delta mu(2)0*), per mole of solvent and solute respectively, enthalpy (Delta H*) and entropy (Delta S*) of activation of viscous flow. The results obtained were utilized in the qualitative elucidation of the Pro-surfactant/formamide and Pro-Pro interactions in the present systems.