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

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

“…As a matter of fact, we found Arrhenius behavior in our previous report on worm-like micelles in salt-free LAD-Lys+C 14 EO 3 aqueous systems 30) . As the case of , G 0 has been found to be rather temperature insensitive for cationic wormlike micelles 38,39) .…”

“…However, when both the carboxylic acid groups of the LAD are neutralized with TEA or lysine, the Krafft point is reduced below room temperature, and a micellar solution is formed at 25 29,30) . In the present study, we have used arginine as a neutralizing agent (counter ion) to compare its phase and rheological behavior with that of the LAD-lysine system.…”

“…Amino acid based anionic surfactants (both natural and synthetic types) are one of the environmentally friendly anionic surfactants having many applications in cosmetic and toiletry products due to their mildness to the skin. Recently, we have found that the N-dodecanoylglutamic acid, designated as LAD (an amino acid based anionic surfactant) upon neutralization with triethanolamine (TEA) or L-lysine forms viscoelastic wormlike micelles in mixed systems of LAD/cationic surfactant or LAD/nonionic surfactant without addition of any salts 29,30) . However, there is no report on this kind of surfactants concerning the effects of salts (often present in formulations) or the effect of changing organic counterions, on the phase behavior and rheological properties of amino acid surfactant aqueous systems.…”

A Rheological Approach to Viscoelastic Worm‐Like Micelles of Tunable Properties

“…This is the typical viscoelastic behavior shown by worm-like micellar solutions. The rheological behavior of this system can be characterized by generalized Maxwell model [25]. For a Maxwell fluid the variation of G 0 and G 00 can be given as [26,27].…”

“…The dominant relaxation time 's' of these viscoelastic samples can be estimated as 1/x c . The magnitude of s is related to the average length of the wormlike micelles [25] and it shows an increase to maximum value at an octanol concentration corresponding to the maximum viscosity. We note that the Maxwell model fits the data reasonably well, the solid line represent the Maxwell model fit to the data points (Fig.…”