Molecular Interactions of Sodium Laureth Sulfate with N-Alkyl-1,3-Propanediamine in Aqueous Solutions, Based on Potentiometric and Photometric Data

摘要

The role of Coulomb and hydrophobic interactions in association and aggregation in binary solu-tions of anionic surfactant sodium laureth sulfate and cationic surfactant N-alkyl-1,3-propanediamine is established from the concentration dependences of the pH of the solutions. It is shown that the development of the processes is initiated by the Coulomb interaction of oppositely charged sodium laureth sulfate and N-alkyl-1,3-propanediamine molecules and enhanced by the hydrophobic interaction between the hydrocar-bon tails of neutral associates of the surfactant molecules.