Surfactants at the solid–liquid interface: Measurements at higher concentrations using optical reflectometry

[Display omitted] •A simple additive two-part model is used to analyse optical reflectivity data.•Applied to simple mixed system (alcohol–water).•Applied to strongly adsorbing layer (CTAB on hydrophilic silica).•Non-adsorbing (depletion) system tested (SDS on hydrophilic silica).•Quantitative analys...

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