Investigation of the complexation behavior of polyethylene oxide with surfactant ternary mixture: Conductometry

Abstract

In binary system consisting only of the oppositely charged surfactants, a single type of aggregates (mostly probably vesicles) was identified. Upon polymer addition, a shift in aggregation concentration was observed; however, no additional clustering occurred and single inflection point was visible in all property versus concentration plots. The binding behavior in ternary mixtures comprising of poly (ethylene oxide), sodium dodecyl sulfate, and acetyl trimethyl ammonium bromide has been studied by using conductivity. The aggregation and binding phenomena were thermodynamically feasible, unraveled by the negative values of Gibbs free energy. An increased amount of adsorbed poly (ethylene oxide) caused an increase in these values, showing an alteration in interfacial free energy due to release of water molecules from vesicles' surface. The area per molecule calculated for ternary system indicted the existence of compact packing in mixed clusters.

Effect of methanol on surfactants and surfactant–PEO mixtures

“…This is chiefly due to competing adsorption of polymer at air–solution interface, its lower CAC value compared to either of the ionic surfactants, and favorable–polymer‐surfactant interactions that are supported by higher methanol content 38,39 . The trend for SDS/PEO is nearly similar to that of CTAB/PEO; however, as indicated earlier, the nature of counterion and head group hydrophobicity causes the difference in behavior of two systems 6 …”

“…The aggregation, thermodynamic parameters, and carrier properties of surfactants can be adjusted through inclusion of organic solvents and allows tailoring of surfactant‐based systems for industrial and pharmaceutical applications 6–8 . Mixed surfactants and polymer systems have gained much interest from theoretical as well as practical perspectives due to its diverse applications in different processes such as in separation, dispersion, and solubilization 9–13 .…”

Micellization, aggregation, interaction, and solubilization behaviors of mixed solutions of cationic gemini and nonionic surfactants

“…In aqueous media, surfactants in both pure and mixed states self‐assemble to form micelles. A crucial parameter for understanding the principles of the self‐organizing process is the micellization threshold concentration, commonly referred to as the critical micelle concentration (CMC) (Begum et al, 2021; Rub et al, 2013). Above the CMC, different types and shapes of aggregates such as micelles, vesicles, and bilayers can easily form in the systems (Kumar & Rub, 2020).…”