Dilational viscoelasticity of polyelectolyte/surfactant adsorption films at the air/water interface: Dodecyltrimethylammonium bromide and sodium poly(styrenesulfonate)

The dynamic surface elasticity of mixed aqueous poly(styrenesulfonate)/alkyltrimethylammonium bromide solutions is measured by the oscillating barrier, oscillating drop, and capillary wave methods as a function of time and surfactant concentration. It was found that at low surfactant concentrations (less than 0.3 mM) the surface viscoelastic behavior is close to that of relatively concentrated pure PSS solutions.