Adsorption kinetics of surfactant molecules at a liquid–air interface

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Abstract
The adsorption of the surfactant sodium–dodecyl naphthalene–sulfonate from the bulk to the water–air interface was studied by optical second harmonic generation. An initial rapid Langmuir type of adsorption to about 80% of a monolayer is observed, followed by a much slower adsorption until a full monolayer is formed.