Journal of Surfactants and Detergents

, Volume 5, Issue 4, pp 397–402 | Cite as

Effect of additives on the adsorption of sodium bis(2-ethyl hexyl sulfosuccinate) at the air-water interface studied by equilibrium and dynamic surface tension measurements

  • Ana Belén Pedrosa
  • José I. Briz
  • M. Mercedes Velázquez


Using equilibrium and dynamic surface tension measurements, we have studied the effect of the addition of poly(sodium 4-styrenesulfonate) (PSS), sodium chloride, and 1,4,7,10,13,16-hexaoxyacyclooctadecane (18-crown-6) on the surface properties of sodium bis(2-ethyl hexyl sulfosuccinate) (AOT). The addition of PSS or NaCl weakly increases the maximum packing of AOT, whereas the presence of 18-crown-6 slightly decreases the maximum surface coverage. The surfactant adsorption kinetics on the interface is a diffusion-controlled process. The two asymptotic solutions at long times and at short times to the classic Ward Tordai equation were used to fit dynamic results. At long times there is evidence of the existence of an electrostatic barrier at high surfactant concentration when using pure AOT and AOT mixed with PSS. In binary mixtures of AOT with sodium chloride or 18-crown-6, the electrostatic barrier is not observed over the surfactant concentration range studied.

Key words

Aerosol OT 18-crown-6 dynamic surface tension equilibrium surface tension poly(sodium 4-styrensulfonate) 



sodium bis(2-ethyl hexyl sulfosuccinate)


a macrocyclic polyether (1,4,7,10,13,16-hexaoxyacyclooctadecane, C12H24O6)


critical vesicle concentration: PSS, poly-(sodium 4-styrenesulfonate)


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Copyright information

© AOCS Press 2002

Authors and Affiliations

  • Ana Belén Pedrosa
    • 1
  • José I. Briz
    • 1
  • M. Mercedes Velázquez
    • 1
  1. 1.Departamento de Química Física, Facultad de Ciencias QuímicasUniversidad de SalamancaSalamancaSpain

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