Free-energy changes on transfer of surface-active agents between various colloidal and interfacial states

Effects of Chain Length and Structure of Cationic Surfactants on the Adsorption onto Na–Kaolinite

“…[2] is verified; the slope of this line in terms of the van der Waals cohesive energy per CH 2 group is 1.03 kT or 2.52 kJ mol Ϫ1 . This value is in excellent agreement with values of determined from studies of solubility and micelle formation (36) and indicates that the lateral interaction is of primary importance in the adsorption of long chain surfactants at the Nakaolinite interface and, consequently, the chain length of the surfactant must have a major effect on this type of adsorption behavior.…”

Adsorption of Monoalkyl Phosphates at the Zircon–Aqueous Solution Interface

“…6. From the gradient, the value of was found to be approximately Ϫ0.85kT per CH 2 group which is consistent with the values of Ϫ0.7 to Ϫ1.0kT found by Lin and Somasundaran for the formation of hemimicelles on an oxide surface (12,15). This result suggests that for low surface coverages, C n MAP anions form two-dimensional aggregates on the zircon surface.…”

Synthesis and study of the surface properties of long‐chain alkylnaphthalene sulfonates

“…From geometric considerations, the micelle aggregation (n) can be calculated (14,15) as where l c is the length of the hydrophobic group, and V H is the volume of the hydrophobic group. In agreement with these geometric considerations, aggregation numbers in aqueous solution increased with increased length of the hydrophobic group (greater l c ) and decreased volume of the hydrophobic group (V H ).…”