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Adsorption of benzyldimethyldodecyl ammonium chloride and benzyldimethyltetradecyl ammonium chloride on polymeric XAD-16 adsorbent was studied by varying the surfactant concentration, the ionic strength of the solution, and the temperature. The data were correlated with eight isotherm models based on different assumptions (number of adsorbed layers, heterogeneity of the surface, lateral interactions...
Using monodisperse anatase and hematite particles, such classical techniques as colloid stability, ζ potential and wettability measurements along with fluorescence spectroscopy show that anionic alkyl sulfate and sulfonate surfactants first associate into hemimicelles at the interface and cause the particles to begin to coagulate and to become hydrophobic. Maximum coagulation and hydrophobicity occur...
The structure of aggregates of lithium perfluorooctanesulfonate (LiFOS) adsorbed to the interface between graphite and aqueous solution have been measured. This fluorocarbon surfactant produces aggregates which are long (∼100 nm) and thin (∼5 nm), and about one molecule (∼1.3 nm) deep. The aggregates lie in straight, parallel arrays on the surface with a characteristic repeat distance, or period,...
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