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Issue 21, 2004
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Adsorption kinetics of ammonium perfluorononanoate at the air–water interface

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Abstract

The adsorption of the fluorocarbon surfactant, ammonium perfluorononanoate (APFN) has been studied in an overflowing cylinder (OFC). The equilibrium adsorption isotherm, determined by drop shape tensiometry, is well-described by the Volmer isotherm. The dynamic surface excess at the expanding surface of the OFC was measured by neutron reflectometry (NR). The dynamic surface excess was in good agreement with the predictions of a diffusion-controlled adsorption model. Significant Marangoni effects were observed. The relationship between the mass transport equation in the OFC and the short and long-time asymptotes of the Ward–Tordai equation is noted.

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Publication details

The article was received on 19 Jul 2004, accepted on 09 Sep 2004 and first published on 21 Sep 2004


Article type: Paper
DOI: 10.1039/B411044G
Citation: Phys. Chem. Chem. Phys., 2004,6, 5061-5065
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    Adsorption kinetics of ammonium perfluorononanoate at the air–water interface

    M. Sekine, R. A. Campbell, D. S. Valkovska, J. P. R. Day, T. D. Curwen, L. J. Martin, S. A. Holt, J. Eastoe and C. D. Bain, Phys. Chem. Chem. Phys., 2004, 6, 5061
    DOI: 10.1039/B411044G

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