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Issue 22, 2001
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Adsorption of surfactants at air/solution interfaces: theoretical description of adsorption equilibrium based on a model of clustering of the surfactant molecules at the air/solution interface

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Abstract

On the basis of the scaled particle theory, a new theoretical approach is developed for adsorption of surfactants capable of forming two-dimensional aggregates at the air/solution interface. The adsorption layer is treated as a mixture of oblate aggregates of various dimensions, interacting via excluded area interactions. A five-parameter equation for the adsorption isotherm is developed, and then integrated to obtain the surface tension isotherm. Experimental surface tension data of a series of n-alkyldimethylphosphine oxides are used for comparison with the equation derived. The numerical best-fit analysis suggests the formation of small aggregates at the air/solution interface for these surfactants. The model parameters obtained while fitting best the model equation to the experimental data show a linear correlation with the alkyl chain length of the surfactant.

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Publication details

The article was received on 02 Aug 2001, accepted on 14 Sep 2001 and first published on 09 Nov 2001


Article type: Paper
DOI: 10.1039/B107019N
Citation: Phys. Chem. Chem. Phys., 2001,3, 5035-5042
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    Adsorption of surfactants at air/solution interfaces: theoretical description of adsorption equilibrium based on a model of clustering of the surfactant molecules at the air/solution interface

    M. Drach, W. Rudziński, P. Warszyński and J. Narkiewicz-Michałek, Phys. Chem. Chem. Phys., 2001, 3, 5035
    DOI: 10.1039/B107019N

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