Hexadecyltrimethylammonium bromide (CTA-Br) and 1-butyl-3-methylimidazolium tetrafluoroborate (bmim-BF4) in aqueous solution: An ephemeral binary system

Abstract

Turbidity immediately appearing when the compounds are mixed in water suggests the spontaneous formation of the low soluble compound hexadecyltrimethylammonium tetrafluoroborate (CTA-BF), together with the salt formed by the respective counterions bmimand Br in solution. For α≠0.5, furthermore of the mentioned compounds, the spare bmim-BF (for α<0.5) or CTA-Br (for α>0.5), are also present in the aqueous solution. Systems containing excess of bmim-BF show a low critical aggregate concentration (cac), but an unexpected high surface tension at cac (γ≈53-56mN/m), as pure CTA-BF. For systems containing excess of CTA-Br, cac increases but γ decreases up to 36mN/m. Mixtures of pure CTA-BF and bmim-BF or CTA-Br behave as typical binary surfactant systems.

Formation of Mixed Micelle in an Aqueous Mixture of a Surface Active Ionic Liquid and a Conventional Surfactant: Experiment and Modeling

“…The micellar and thermodynamic properties of the imidazolium-based surface active ionic liquids , and their mixtures with anionic, nonionic, zwitterionic, and gemini surfactants have been investigated in detail. , However, studies involving ILs and cationic surfactants are scarce with the exception of very few reports. , In general, mixtures of cationic surfactants have, so far, been paid relatively less attention. ,, …”