Determination of flow activation energy at viscosity maximum for spherical and wormlike micelles of different lengths and flexibility

Study of the Formation and Solution Properties of Worm-Like Micelles Formed Using Both N-Hexadecyl-N-Methylpiperidinium Bromide-Based Cationic Surfactant and Anionic Surfactant

“…The value of E a and E scis can be obtained from an Arrhenius plot of ln versus 10 3 / T as given by [23] , [24] : Here, E a is the flow activation energy, which is necessary to move individual micelles in an environment of surrounding micelles. E a should be proportional to because of the definitions of E a and .…”

pH-responsive viscoelastic supramolecular viscosifiers based on dynamic complexation of zwitterionic octadecylamidopropyl betaine and triamine for hydraulic fracturing applications

“…Given that a lower activation energy indicates less sensitivity to temperature, as pH of DBC increases the temperature sensitivity increases. In comparison, activation energy for wormlike micelles were reported to be in the range of 70-300 kJ mol À1 , 65,66 indicating that a better temperature tolerance of DBCs compared to wormlike micelles and also implying potential nanostructural differences between DBCs and wormlike-micelles.…”

Kinetics and Mechanism of Counterionic Salt-Catalysed Piperidinolysis of Anionic Phenyl Salicylate in the Presence of Cationic–Nonionic Mixed Micelles

“…Several studies have been published on the role of different inert salts in modifying the structural features of cationic micelles in aqueous solution and, directly or indirectly, it is believed that these salts influence the micellar structural growth [10][11][12]. In addition, some studies [13][14][15] reported possible quantitative correlations between the hexadecyltrimethylammonium bromide (HDAB) micellar binding constants and the counterion and/or temperature-induced micellar structural growth. These studies [13][14][15] and some related ones [16][17][18] used a semi-empirical kinetic (SEK) method to determine the values of the relative counterion binding constant, K X Br or R X Br (with R X Br = K X /K Br , where the values of HDAB micellar binding constants, K Br and K X , were derived from kinetic parameters obtained in the presence of micelles with different structural features) [19].…”

“…In addition, some studies [13][14][15] reported possible quantitative correlations between the hexadecyltrimethylammonium bromide (HDAB) micellar binding constants and the counterion and/or temperature-induced micellar structural growth. These studies [13][14][15] and some related ones [16][17][18] used a semi-empirical kinetic (SEK) method to determine the values of the relative counterion binding constant, K X Br or R X Br (with R X Br = K X /K Br , where the values of HDAB micellar binding constants, K Br and K X , were derived from kinetic parameters obtained in the presence of micelles with different structural features) [19]. However, these reports lack information on reliable mechanism(s) of the effects of nonionic surfactants in the cationic micellar structural transition which opens up the possibility of optimising the use of mixed micelles in advanced technologies and industries [20].…”