Energetics of anionic surfactant-additive systems at the cloud point

Abstract

The energetics of clouding in anionic surfactant (SDBS) and tetrabutylammonium bromide sys tem in the presence of additives, such as ureas, amino acids and sugars is reported. The change of standard Gibbs energy of solubilization (Δ ) for all of the additives was found to be negative. The values of change of standard enthalpy (Δ ) and that of standard entropy (TΔ ) values were found to depend on the type and chemistry of the additive. The results were explained on the basis including chemistry of additives, their effect on water structure, and solubilization of additives either in the micellar or in aqueous phases.

Physico‐chemical and Spectroscopic Approach to Analyse the Behaviour of Surface‐Active Ionic Liquid and Conventional Surfactant in Aqueous Glycine

“…Clouding is a reversible phenomenon in which after a certain temperature known as the cloud point (T cp ), surfactant solutions separate out into two visible phases, one of which is surfactant-rich and the other is the aqueous phase containing a surfactant concentration around its CMC [27]. Phase separation on heating is a common phenomenon that has been investigated widely in nonionic surfactants [28,29].…”