Interaction of Methyl Red with Cetylpyridinium Chloride in Methanol-Water System

The interaction between methyl red (azo dye) and cetylpyridinium chloride (cationic surfactant) in the methanol-water system were studied using a spectrophotometric technique. Variable parameters like constant dye concentration and its structure, surfactant concentration, pH, absorbance, and solvent composition were studied. Using the UV-Vis technique, critical micelle concentrations (CMCs) of cetylpyridinium chloride were measured with methyl red. The spectral data were analyzed and determined the differential absorbance, binding and partition constants, partition coefficient, the Gibbs free energy of binding and partition in mixed solvent media (0.1, 0.2, 0.3, 0.4 volume fraction (v.f.)s of methanol, respectively).

Automated summary

The interaction between methyl red and cetylpyridinium chloride in the methanol-water system was studied using a spectrophotometric technique. Parameters such as dye concentration, surfactant concentration, pH, absorbance, and solvent composition were investigated. The UV-Vis technique was used to measure the CMCs of cetylpyridinium chloride with methyl red, and spectral data were analyzed to determine various constants.