title: Solubilization of Amphiphilic Hemicyanine Dyes by a Cationic Surfactant, Cetyltrimethylammonium Bromide
abstract: The solubilization of amphiphilic hemicyanine dyes by the micelles of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), was studied as a function of surfactant concentration above the critical micelle concentration (CMC). The micelle-water partition coefficient, Kx, and the standard free energy of solubilization, DeltaG0, of these dyes in CTAB micelles was determined at 25.0&deg;C by a differential spectroscopic method. The CMCs of CTAB in the presence of small amounts of these dyes were determined by a conductivity method at 25.0&deg;C. The values of Kx and DeltaG0 for all six dyes were determined by an improved method that incorporates both conductance and differential absorbance data.
authors.affiliation: Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
authors.initials: SS
authors.lastname: Shah
authors.initials: MS
authors.lastname: Khan
authors.initials: H
authors.lastname: Ullah
authors.initials: MA
authors.lastname: Awan