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The aggregation of sodium perfluorooctanoate in water

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Abstract

The self-aggregation of sodium perfluorooctanoate (SPFO) has been studied by pH, ion-selective electrodes, changes in Rhodamine 6G colour and fluorescence, conductivity, surface tension and viscosity measurements. It has been determined that the aggregation of SPFO is gradual. It starts to aggregate at 0.01 mol dm−3 with the formation of pre-micelles of perfluorooctanoate ions, which capture counterions at C=0.02 mol dm−3 and form micelles at a critical micelle concentration (CMC) of 0.03 mol dm−3. Micelles at the CMC are highly ionised and strongly hydrated. At C*=0.06 mol dm−3, a low ionisation degree was found, indicating the formation of a more compact micellar structure. Micelles at the CMC show energetic advantage in comparison with the adsorbed state at the air/solution interface, and this advantage increases at C* originating desorption.

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Acknowledgements

This research was funded by the Spanish Ministry of Science and Technology (Project MAT2002-00608, European FEDER funds included) and Xunta de Galicia (Project PXIC20615PN).

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Authors and Affiliations

  1. Grupo de Biofísica e Interfases, Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain

    José L. López-Fontán & Félix Sarmiento

  2. Grupo de Ciencias de Superficies y Coloides, Departamento de Química, Universidad Nacional del Sur, 8000, Bahía Blanca, Argentina

    Pablo C. Schulz

Authors
  1. José L. López-Fontán
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  2. Félix Sarmiento
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  3. Pablo C. Schulz
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Correspondence to Pablo C. Schulz.

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López-Fontán, J.L., Sarmiento, F. & Schulz, P.C. The aggregation of sodium perfluorooctanoate in water. Colloid Polym Sci 283, 862–871 (2005). https://doi.org/10.1007/s00396-004-1228-7

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  • DOI: https://doi.org/10.1007/s00396-004-1228-7

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