Adsorption layer structure formation at the air/water interface in aqueous mixtures of an anionic carboxylate gemini and a cationic surfactant

Surface activity of mixtures of dodecyl trimethyl ammonium bromide with sodium perfluorooctanoate and sodium octanoate

“…The larger negative value of β for the monolayer (compared to micelle) reflects the earlier observation regarding the relative value of the C45mJ/m 2 of the mixed surfactant systems with respect to the pure ones. Zhao et al (24) have l l found in a DTAB-gemini anionic surfactant system that the interaction parameter of the monolayer is slightly larger and -more negative than the corresponding micelle, ranging between -16 and -18 (close to the values presented in Figure 4B). The reason why the monolayer tends to produce an equimolar composition may be linked to the curvature of the monolayer and micelles.…”

“…for other hydrocarbon-hydrocarbon mixtures (24), which reflects the relatively mediocre interaction between SOCT and DTAB.…”

Phase behavior and morphology of equimolar mixed cationic–anionic surfactant monolayers at the air/water interface: Isotherm and Brewster angle microscopy analysis

“…Adsorbed Gibbs monolayers of mixed cationic-anionic surfactants have been formed at the air/water interface, and the phase transition behavior of the Gibbs monolayers has been investigated [13][14][15][16]. Based on time-dependent adsorption data, it has been suggested that a two-dimensional gas/condensed phase transition occurred in the adsorption layer of catanionic surfactants and the longer alkyl chain with larger attractive interactions made the two-dimensional phase transition more favorable.…”

Wormlike micelles formed by mixed cationic and anionic gemini surfactants in aqueous solution

“…Two cationic gemini surfactants, 2-hydroxyl-propanediyl-a,xbis(dimethyldodecylammonium bromide) and propanediyl-a,xbis(dimethyldodecylammonium bromide), referred to as 12-3(OH)-12 and 12-3-12, respectively, and an anionic gemini surfactant, O,O 0 -bis(sodium 2-dodecylcarboxylate)-p-benzenediol, referred to as C 12 /C 12 , were synthesized in our laboratory and reported elsewhere [29,34]. All the products were confirmed by 1 H NMR and elemental analysis as shown in Supporting materials.…”