Interaction and physicochemical parameters of dodecyltrimethylammonium bromide and crystal violet dye mixture in aqueous alcohols and urea solution: Effects of change in composition and temperature

Herein, the interaction between dodecyltrimethylammonium bromide (DTAB), a cationic surfactant, and crystal violet (CV) has been studied by applying the conductometric method in aqueous solutions of short chain alcohols (ethanol, 1-propanol) and urea. The critical micelle concentration (CMC), counter ion binding (β) and the thermodynamics parameters (ΔGm0, ΔSm0 and ΔHm0) for the assembly of DTAB + CV system were determined. For the DTAB + CV micellization in presence of aqueous alcohols and urea solutions, a single break point was obtained in every circumstance. The values of CMC for the study system are found to upsurge with the increase of concentration of alcohols and urea as well as with the increase of temperature. The ΔGm0 values were found negative for DTAB + CV mixtures in the study media, which indicated that the micellization process was thermodynamically spontaneous. In all cases, the -ΔHm0 and -ΔSm0 values disclosed that the recommended interaction forces functioning amid DTAB and CV are the hydrophobic and electrostatic interactions.