Aggregation of quaternary ammonium gemini surfactants C12-s-C12⋅2Br in n-heptane/n-hexanol solution: Effect of the spacer chains on the critical reverse micelle concentrations

Relation between the hydrophile/hydrophobe ratio of malonamide extractants and the stability of the organic phase: investigation at high extractant concentrations

“…This behavior was observed elsewhere for a gemini surfactant in an apolar solvent. 35 To explain such an effect, a description of the system in terms of the interaction forces acting between the extractant and the solvent may be useful.…”

Dilution method study on the interfacial composition and structural parameters of water/C12––C12⋅2Br/n-hexanol/n-heptane microemulsions: Effect of the oxyethylene groups in the spacer

“…Recently, we investigated the reversed aggregates of alkanediyl-α,ω-bis-(dimethyldodecyl-ammonium bromide) Gemini surfactants, referred to as C 12 -s-C 12 ·2Br, in n-heptane with the assistance of n-hexanol [1][2][3]. The results showed that the aggregation of the surfactants, the solubilization of the reverse micelles for water, and the interfacial composition and structure of the microemulsion considerably depended on the length of the spacer.…”

Fourier transform infrared investigation on the state of water in reverse micelles of quaternary ammonium gemini surfactants C12-s-C12⋅2Br in n-heptane

“…Recently, we have investigated the aggregation of a homologous series of gemini surfactants, alkanediyl-α,ω-bis(dimethyldodecylammonium bromide) (designated as C 12 -s-C 12 ·2Br) in n-heptane with the assistance of n-hexanol [13][14][15]. A part of n-hexanol participates to construct a film of water droplet together with C 12 -s-C 12 ·2Br, where the hydroxyl groups of n-hexanol molecules interact with the quaternary ammonium heads of surfactants.…”

“…O-H stretching bands of water solubilized by the reverse micelles in the water/C 12 -2-C 12 ·2Br (0.1 M)/n-hexanol/n-heptane system (I), where from 1 to 7, W 0 (the mole ratio of water to surfactant) is10,12,15,18,20,22, and 25, respectively. Similar spectra for water/C 12 TABr (0.1 M)/n-hexanol/n-heptane system are shown in (II) for comparison, where from 1 to 6, W 0 is 10, 15, 20, 25, 30, and 35, respectively.…”