| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 594810 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2011 | 5 Pages |
The adsorption of the anionic surfactant SDS in mixtures with non-ionic surfactants of the Triton type (X-45, X-100, X-165, X-405) is studied by bubble profile analysis tensiometry at the solution/air interface. The surface tension isotherms are described by a thermodynamic model for mixed surfactants which allows consideration of different adsorption models for the two compounds: a reorientation model for the Tritons and a Frumkin model for SDS. The experimental data are very well described by the model while for the mixtures the characteristic parameters of the single compounds have been used.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Bubble profile tensiometry is suitable for adsorption studies at low surfactant concentration. ► SDS and Tritons follow the Frumkin model and the reorientation model, respectively. ► A thermodynamic model allows to describe the adsorption of these mixed surfactant layers. ► The competitive adsorption of SDS and Triton leads to changes in surface layer composition. ► Peculiarities are explained by a gradually displaced of the ethylene oxide chain from the surface.
