Viscoelasticity in surfactant solutions. Characteristics of the micellar aggregates and the formation of periodic colloidal structures

Abstract

Publicatlon costs assisted by the University of LundThe properties of viscoelastic dilute aqueous solutions containing the hexadecyltrimethylammonium cation (CTA+) are investigated by monitoring the proton magnetic resonance spectrum and the linear dichroism induced in a shear gradient. It is found that the viscoelastic behavior of the dilute solutions correlates with the formation of rod-shaped micellar aggregates. This correlation is manifested both with respect to changes in composition and in temperature. It is suggested that the behavior of the solutions is caused by the presence of a periodic colloidal structure formed due to the repulsive force between the aggregates.

Rheology of Wormlike Micelles: Equilibrium Properties and Shear Banding Transitions

“…One intriguing result was that the viscoelasticity of the solution began to increase well below the cmc of the surfactant. Some years later, Gravsholt and coworkers recognized that other types of additives, such as salicylate or chlorobenzoate counterions, are actually solubilized by the micelles, lowering the cmc of the surfactant [59,125]. It was suggested by the same authors that the viscoelasticity had the same physical origin as that of polymer solutions and melts, namely entanglements and reptation [104].…”

Formation of Giant Liposomes from Crystalline Complexes of Monoalkylammonium Surfactants and 4‐Hydroxybiphenyl

“…On the other hand, a low-viscosity micelle solution sometimes transforms into a highly viscous solution when a certain aromatic compound, for example the salicylate ion, is added. [1] Transmission electron microscope (TEM) pictures reveal that the viscous solutions contain rodlike structures.…”

Effect of Counterion Structure on Micellar Growth of Alkylpyridinium Surfactants in Aqueous Solution

“…Therefore, the suggestion that viscoelastic solutions contain linked spherical micelles is not likely. Ulmius et al (37) suggested that the properties of these solutions are caused by a periodic colloidal structure, formed as a result of the repulsive force between the aggregates. Fuhrop and Helfrich (38) proposed that helical ribbons are formed when cetyltrimethylammonium bromide and salicylic acid are dissolved in water.…”