Investigation of Micellization and Spectrophotometric Study on the Interaction between Sodium Dodecyl Sulfate and Methylene Blue in Propanol-Water Mixed Solvent Media

Abstract

The study examines the micellization of sodium dodecyl sulfate (SDS) with methylene blue (MB) in a propanol-water mixed solvent system within a temperature spanning from 298.15–313.15 K. The conductivity measurements of SDS-MB complex was carried out at 5, 10, and 15% volume fraction of propanol in water both in absence and presence of dye. The variation of CMC with temperature was analyzed to assess thermodynamic parameters of micellization. This approach offers valuable insights on the behavior of surfactant in mixed solvent system and sheds lights on different interactions occurring within the system. Spectrophotometric analysis was conducted to investigate the interactions between SDS-MB complex at 5, 10, and 15% volume fraction of propanol in aqueous medium. An increment in volume fraction of propanol hinders the process of micellization. However, in the presence of MB increases the efficiency of micellization and rendering the process more spontaneous. Consequently, MB monomers become associated with micelle which is the case of dye solubilization.