General rules for the scaling behavior of linear wormlike micelles formed in catanionic surfactant systems

Rheological Properties of Wormlike Micelles Formed in Aqueous Systems of 3‐Alkoxy‐2‐hydroxypropyl Trimethyl Ammonium Bromides in the Presence of Sodium Octanoate

“…The relationship between g 0 and SO concentration obeys the power law, g 0 / C 3:49 before the maximum, which was close to those wormlike micelles formed by nonionic surfactants investigated by Cates and co-workers (about 3.5) [17,18]. The similar curve of a single pronounced peak was also observed in other cationic surfactant systems [7,[11][12][13]19] and some conventional ionic surfactant/salt aqueous systems [20,21]. For the viscosity going through a maximum as a function of surfactant ratio or salt content, there are two hypotheses in the literature.…”

Rheology of wormlike micelles in mixed solutions of cocoamidopropyl betaine and sodium dodecylbenzenesulfonate

“…From the fits to the data, values for the Maxwell relaxation time τ M and plateau modulus G 0 for the fluids were calculated from the fittings to the experimentally obtained data and are provided in Table 1. [35,36]. These deviations are considered to be due to the faster relaxation processes such as the one described by the Rouse model of cylindrical micelles, analogous to a polymer chain [24].…”

“…In a solution with higher viscosity both processes, namely diffusion and dissociation-recombination, are slower and result in a slower structural relaxation and a longer relaxation time [37]. Generally it was observed that the systems with Viscosity decay after the maximum has been observed in other systems of wormlike micelles [35,41,42], however, so far the reason for its occurrence has not been fully explained. The peak of zero shear viscosity is usually related to two hypothesis [43][44][45][46].…”

Role of matching water affinities between oppositely charged headgroups in the rheological properties of aqueous mixed cationic/anionic surfactant systems

“…Then investigations on the rheological properties and viscoelasticities of wormlike micelles formed by cationic/anionic or salt-free catanionic surfactants were progressively performed [9,10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Zero-shear viscosities (Á 0 ) usually exhibit maxima with respect to total surfactant concentration m T or composition for cationic/anionic surfactant systems with fixed composition (such as a fixed weight ratio or molar ratio) or fixed m T .…”

“…Whereas, for those cationic/anionic surfactants, aqueous two-phase separation spontaneously takes place at certain composition range, the origin of the viscosity peaks at isotropic single-phase regions is linked with micellar growth and micellar branching [12,[15][16][17][18], or the elongation of rodlike micelles and the microstructural transition from rodlike micelles to vesicles [33]. The values of Á 0 peaks are dependent on many factors, such as asymmetry in surfactant tail lengths [14], the total surfactant concentration or composition [15][16][17][18]24,28,30,33], the molecular structure of surfactant (type of headgroups, number of headgroup and alkyl chain) [15,16,24,33], the counterion type of surfactant [24], the concentration and type of added salt [27,33], temperature [15,24].…”