From stability in aqueous solutions of nonionic surfactant and inorganic electrolyte

Abstract The froth stability of aqueous solutions of nonionic surfactant was found to increase on addition of low concentrations of KCl but to decrease at higher concentrations. From earlier reported studies on free aqueous films, it could be suggested that two different types of stabilizing mechanisms were operating in the froth system. At low electrolyte, the increase in froth stability was explained by the decrease in interfacial electrostatic repulsion and Newton's black films formation while at high electrolyte, the lower stability was accounted for by weaker steric forces.