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 bind-ing (p) and the thermodynamics parameters (AG0m, AS0m and AH0m) 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 tem-perature. The AG0m values were found negative for DTAB + CV mixtures in the study media, which indi-cated that the micellization process was thermodynamically spontaneous. In all cases, the-AH0m and-AS0m values disclosed that the recommended interaction forces functioning amid DTAB and CV are the hydrophobic and electrostatic interactions.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

The interaction between dodecyltrimethylammonium bromide (DTAB) and crystal violet (CV) was studied in aqueous solutions of short chain alcohols (ethanol, 1-propanol) and urea using the conductometric method. The critical micelle concentration (CMC), counter ion binding (p), and thermodynamics parameters (AG0m, AS0m, and AH0m) were determined for the DTAB + CV system. The CMC values increased with the concentration of alcohols and urea as well as with temperature. The micellization process was found to be thermodynamically spontaneous, with hydrophobic and electrostatic interactions playing a significant role in the interaction between DTAB and CV.