Electrical Aspects of Adsorbing Colloid Flotation. IX. Effects of Surfactant Overdosing

Electrical Aspects of Adsorbing Colloid Flotation. XVII. Quasi-Chemical Method for Adsorption of Mixed Surfactants

“…This is discussed in earlier papers(21)(22)(23)(24)(25)(26). The results of increasing the temperature are similar to those of decreasing the wxy insofar as the shapes of the isotherms are concerned, since Eqs.…”

Modeling Effects of pH and Counterions on Surfactant Adsorption at the Oxide/Water Interface

“…Two schools of thought exist concerning the modeling of physical adsorption of surfactants on mineral oxide surfaces from aqueous solutions. The first school includes the work of Ottewill, Fuerstenau and Somasundaran, , Koopal, − and Wilson and co-workers. , The adsorbing surface is generally treated as being homogeneous. These workers essentially consider that at a certain critical concentration, hydrocarbon chains begin to associate at the surface.…”

“…In the earlier models, single-layered, two-dimensional aggregates (hemimicelles) are formed, which contain small numbers of molecules. In these models, the adsorption is described by the Stern−Langmuir equation, , the Stern−Grahame equation, , modifications of these, , or the Fowler−Guggenheim equation. , In later models, Wilson 19 and Böhmer and Koopal 7-9 have allowed for the formation of bilayered structures at high surfactant concentrations. Wängnerud and Jönsson 34 have calculated that bilayered structures will form instantaneously at a critical concentration without prior monolayer formation, provided the surface charge density is high enough.…”

“…The first school includes the work of Ottewill, 25 Fuerstenau and Somasundaran, 31,32 Koopal, [5][6][7][8][9] and Wilson and co-workers. 19,35 The adsorbing surface is generally treated as being homogeneous. These workers essentially consider that at a certain critical concentration, hydrocarbon chains begin to associate at the surface.…”