Abstract
Adsorption isotherms for a range of polyoxyethylated nonyl phenols on silica and methylated silica have been determined. It is shown that the length of the ethylene oxide chain has greater effect on the maximum packing density of surfactant at the interface the more hydrophilic the substrate. Normalisation of adsorption isotherms with respect to the critical micelle concentration of the surfactant reveals a clear difference in the mechanism of adsorption on silica (hydrophilic) and methylated silica (hydrophobic) surfaces. Results are consistent with the attachment of surfactant species via the ethylene oxide chain onto silica and via the nonyl phenol hydrophobe onto methylated silica.
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