Thermodynamics of micellization of cationic surfactants based on O-alkyl and O-perfluoro-N,N′-diisopropylisourea: Effect of the counter ion nature

Effect of the Molecular Structure on the Adsorption Properties of Cationic Surfactants at the Air–Water Interface

“…In this work, we have shown that the adsorption at the air-water interface of the investigated cationic surfactants [19] is strongly influenced by their structure. We have seen that the nature of counter ion has an important influence on the surface activity of the surfactants.…”

“…where DG°m ic is the standard Gibbs free energy change involved in the transfer of 1 mol of surfactant from the solution to the micellar phase. The DG°m ic values were calculated in our previous work [19]. Data in Tables 3 and 4 show that DG°a ds values are more negative than the corresponding DG°m ic values.…”

“…As a continuation of our studies [18,19], in the present work, we shall describe the effect of the nature of the counter ion, the nature of the apolar chain and the influence of temperature on the surface activity and thermodynamic properties of adsorption of the cationic surfactants in aqueous solution. The aim of this work is to understand the counter ion effect on adsorption.…”

“…This study allowed us to evaluate the effect of the nature of counter ion, the nature of the apolar chain which can be hydrogenated or fluorinated and the impact of temperature on the surface properties of the surfactants synthesized. In another paper [19], we studied the thermodynamic properties of micellization of the two series of cationic surfactants synthesized.…”

Synthesis and Surface Properties Study of a Series of Cationic Surfactants with Different Hydrophobic Chain Lengths

“…In previous works, we synthesized and studied the surface properties of a series of hydrochlorides of O-perfluoroalkyl-N,N 0 -dialkylisourea [17,18]. In another study, we evaluated the influence of the nature of the counter ion, the nature of the hydrophobic chain and the impact of temperature on the surface properties [19]; a thermodynamic study on the micellization process was carried out [20].…”