Temperature dependence of the non-Newtonian viscosity of elongated micellar solutions

Highly viscous wormlike micellar phases formed from the mixed AOT/C14DMAO/H2O system

“…The flow activation energy value (E a ) calculated from the slope of the straight line of s R versus 1/T is 112 KJ mol À1 , while that from a plot of g 0 versus 1/T is 101 KJ mol À1 . The two values are comparable to reported values for other wormlike micellar systems [7,20,23,61,62]. The decay of viscosity with temperature may be ascribed to two main reasons: one is the shortening of micelles, and the other is the formation of micellar joints.…”

Wormlike micelles in mixed amino acid-based anionic/nonionic surfactant systems

“…The value of flow activation energy calculated to 176 kJ/mol from the slope of the straight-line fit in Fig. 4 is comparable to the reported value (70-300 kJ/mol) for wormlike micelles obtained in other systems [12,15,39,[50][51][52]. The viscosity decay with increasing temperature may be due to the shortening of micelles or due to formation of the micellar joints in the networked structure, i.e., micellar branching [53].…”

Structural changes in CTAB/H2O mixtures using a rheological approach

“…This behaviour is similar to that found for CTAB micelles in the presence of alcohols 22 and for CTAB in the presence of salts. 23 The shear thinning behaviour appears increasingly pronounced as the surfactant concentration increases. This non-Newtonian flow response and the corresponding increase in viscosity with CTAB composition is attributable to structure-forming interactions and the anisometric nature of micelles, that orient themselves in high shear rates.…”