Giuseppe Rosario DEL SORBO
Understanding Viscosity Changes in Oppositely Charged Biopolyelectrolyte-Surfactant Complexes
Mixtures of polyelectrolyte and surfactants (PESCs) are found in a wide range of industrial applications, from enhanced oil recovery operations to home and personal care products. These mixtures form a phase diagram in which solutions with excess of both polyelectrolyte (PE) and surfactant are clear and homogenous, while precipitates are formed around charge equilibrium. In this work, we investigate PESCs consisting of PE JR 400 (cationic, cellulose based polymer) and two different surfactants, namely sodiumoctyl sulphate (SOS) and sodium tetradecyl sulphate (STS). Because SOS and STS only differ in the length of their alkyl chains, we shad light on the effect of the surfactant tail length on the rheological properties of the solutions.