From the surface tension curves, the maximum surface area that de-scribes the adsorbed amount of surfactant molecules at the air-water in-terface (Гmax) were estimated using the Gibbs adsorption isotherm (Eq. (3)). We should be aware of the several problems associated with the use of Gibbs isotherm to estimate surfactant adsorption [15], how-ever these values have strong comparative interest.
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