Gas permeability of foam films stabilized by an alpha olefin sulfonate (AOS) surfactant

In the present study we examine the basic properties of single foam films prepared from alpha (C14-C16) olefin sulfonate (AOS). The film thickness was measured as a function of the electrolyte (NaCl) concentration. Special attention was focused on the gas permeability of the films defined by permeability coefficient k(f) (cm/s). The influence of the film thickness and surfactant adsorption on k(f) was followed. Supporting surface tension experiments at different surfactant concentrations were performed to obtain the adsorption of AOS at air/aqueous solution interface at different surfactant and salt concentrations.