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

Abstract

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.

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Abbreviations

AOT:

sodium bis(2-ethyl hexyl sulfosuccinate)

18-crown-6:

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

cvc:

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

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Correspondence to M. Mercedes Velázquez.

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Pedrosa, A.B., Briz, J.I. & Velázquez, M.M. 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. J Surfact Deterg 5, 397–402 (2002). https://doi.org/10.1007/s11743-002-0239-4

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Key words

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