A pH-Responsive Foam Formulated with PAA/Gemini 12-2-12 Complexes

In the search for responsive complexes with potential applications in formulation of smart dispersed systems such as foams, we hypothesized that a pH-responsive system could be formulated polyacrylic acid (PAA) mixed cationic surfactant, Gemini 12-2-12 (G12). We studied PAA-G12 at liquid–air interfaces by equilibrium and dynamic surface tension, rheology, X-ray reflectometry (XRR). found adsorb synergistically, lowering tension surfactant concentrations well below critical micelle concentration (cmc) surfactant. stability foams function pH. The respond reversibly to pH changes: 3.5, they are very stable; > 6, do not form all. data presented here demonstrate foam formation its responsiveness due interfacial dynamics.