Effect of Ionic Liquids C_nmimBr on Properties of Gemini Surfactant 12-3-12 Aqueous Solution

Abstract

The effect of ionic liquids C n mimBr (n ) 4, 6, 8) on the properties of cationic Gemini surfactant trimethylene-1,3-bis(dodecyl ammonium bromide) (Gemini 12-3-12) aqueous solution was investigated. The critical micelle concentration (cmc) of Gemini 12-3-12 solutions containing different amounts of ionic liquids were obtained by measurement of surface tension. The composition of mixed micelle and the interaction parameter between ionic liquids and Gemini 12-3-12 were calculated by Rubingh regular solution model; the effective area of Gemini 12-3-12 molecule at air/water interface was calculated by Gibbs adsorption isotherm. The results show that the addition of ionic liquid has important effect on the properties of surfactant aqueous solution. The cmc of surfactant solution and the effective area of surfactant molecules at the air/water interface vary parabolically with the addition of ionic liquids owing to the two extra opposite effects of ionic liquids in surfactant aqueous solutions besides counterion effect, participation of micelles formation, and the effect on the properties of solvent. The effect of ionic liquids on surfactant solution can be regarded as the comprehensive effects of inorganic salt, cosurfactant, and cosolvent on surfactant solution.

Effect of [C n mim][Br] Based Ionic Liquids on the Aggregation Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Medium

“…The results suggest that, with increasing IL concentration, the effective area per molecule at the interface increases, whereas the minimum area per molecule at the interface decreases to 0.6 wt%, thereafter followed by a reverse trend. Similar trends were observed when NaBr was added to the dimeric surfactant trimethylene-1,3-bis(dodecyl ammonium bromide (12-3-12) [82]. With the addition of NaBr, a continuous increase in C max and decrease in A min were observed, which is expected for an inorganic electrolyte [68,71].…”

“…Javadian et al reported similar observation for the CTAB and SDS surfactants in the presence of ILs [66,67]. The addition of ILs changes the effective area of the surfactant molecule at the air-water interface in a parabolic manner [82]. The effective area is higher for [C 8 mim][Br] than for [C 6 mim][Br] due to the higher hydrophobicity.…”

A novel cationic Gemini surfactant with amide group: synthesis and micellization behavior in aqueous solutions

“…Various physicochemical properties of surfactants have been reported to be much sensitive to molecular architecture and environmental conditions such as temperature, pressure, and additives [5][6][7][8][9][10]. Cationic Gemini surfactants were found to be less toxic and less persistent in the environment than the conventional quaternary ammonium surfactants [11,12]. Generally, Gemini surfactants that are symmetrical in the structure are called homogemini, whereas the asymmetrical dimeric surfactants are called heterogemini.…”

Effect of Polar Organic Solvents on Self‐Aggregation of Some Cationic Monomeric and Dimeric Surfactants

“…A large number of studies have been dedicated to the development of gemini surfactants as they have a number of exclusive properties in contrast to conventional single-chain surfactants [8,9]. In general, Gemini surfactants have much lower CMC values, higher surface & Kallol K. Ghosh kallolkghosh@yahoo.com 1 activity, lower Krafft temperatures, interesting visco-elasticity properties and better lime-soap dissolving properties, and they are often better moistening agents [10][11][12][13][14].…”