Abstract
The effect of single- and double-branched alcohols on the phase and rheological behavior of the laurylsulfobetaine (LSB)/water system was studied, with special attention to the reverse micelles region. In our case, reverse micelle phases behaved as Newtonian fluids where alcohols play the role of solvent. Indeed, it can be concluded that the extension of the reverse micelles phase is determined by the alcohol miscibility in water. Regarding liquid crystals, it is observed that the lamellar phase exhibits gel-like behavior and is the most sensitive to the type of alcohol, affecting the elastic properties and the yield stress values. On the contrary, the hexagonal liquid crystal is barely sensitive to the kind of alcohol. In addition, a comparative study of the phase and rheological behavior of two dodecyl surfactants with different head groups (sulfobetaine LSB, and poly(oxyethylene) Brij-35) as a function of surfactant and tert-butyl alcohol concentrations was performed, revealing two completely different...
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