Change in the Aggregational Character of the Cationic Surfactant Cetyl Trimethyl Ammonium Bromide in the Presence of o- and p-Nitrophenolates

• Published in: Journal of surfactants and detergents Vol. 8; no. 4; p. 319
• Main Authors: Gokhale, G D, Hassan, P A, Samant, S D
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01-10-2005
• Subjects: Ammonium; Diffusion coefficient; Light scattering; NMR; Nuclear magnetic resonance; Salt; Salts; Sodium; Surfactants; Viscosity
• ISSN: 1097-3958; 1558-9293
• DOI: 10.1007/s11743-005-0362-2

The effect of the addition of sodium salts of p-nitrophenol and o-nitrophenol on the structural transition of aqueous micellar solutions of the cationic surfactant cetyl trimethyl ammonium bromide (CTAB) was studied by viscosity, ^sup 1^H nuclear magnetic resonance, and dynamic light scattering measurements. The rapid increase in the relative viscosity of CTAB solutions on the addition of sodium salts of o-nitrophenol and p-nitrophenol was due to the transition in micellar shape from spheres to rods. Dynamic light scattering studies indicated a decrease in the diffusion coefficient of the micelles with the addition of p-nitrophenol. The adsorption and orientation of the salts on the micellar surface and subsequent growth of the micelles was studied by nuclear magnetic resonance. [PUBLICATION ABSTRACT]