TX-100/Water/1-Butyl-3-methylimidazolium Hexafluorophosphate Microemulsions

Abstract

Both ionic liquids and water are typical green solvents. In this work, the phase behavior of the ternary system consisting of ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6), TX-100, and water was determined at 25.0 degrees C. The water-in-bmimPF6, bicontinuous, and bmimPF6-in-water microregions of the microemulsions were identified by cyclic voltammetry method using potassium ferrocyanide K4Fe(CN)6 as the electroactive probe. Dynamic light scattering (DLS) and the UV-vis method were used to characterize the microemulsions. It was demonstrated that the hydrodynamic diameter (Dh) of the bmimPF6-in-water microemulsions is nearly independent of the water content but increases with increasing bmimPF6 content due to the swelling of the micelles by the ionic liquid. The UV-vis further confirmed the existence of water domains in the water-in-bmimPF6 microemulsions, and the salt potassium ferricyanide K3Fe(CN)6 could be dissolved in the water domains.

Nonaqueous ionic liquid microemulsions of 1-butyl-3-methylimidazolium tetrafluoroborate, toluene and ethanol

“…18 < f T < 38% for R E/IL ), the relatively dramatic change of D P indicates that the microstructure of the microemulsion is different from the droplet structures of the microemulsions. According to the principle of distinguishing subregions in microemulsions using the apparent diffusion coefficient, 23,27,34 this result suggests that a BC microstructure, in which bmimBF 4 and immiscible toluene are both local continuous phases, is formed.…”

Various Self-Assembly Behaviors of Amphiphilic Molecules in Ionic Liquids

“…The feasibility of the conductivity method was further proved by cyclic voltammetry experiments. In addition, an environmentally friendly IL microemulsion has also been prepared by using a common hydrophobic IL, bmimPF 6 as a replacement of organic solvents [46,47]. Both Triton X-100 and nonionic surfactant Tween-20 support the formation of such IL microemulsion.…”

Supramolecular Structures in the Presence of Ionic Liquids

“…First of all, IL based microemulsions, in which ILs replaced water of traditional microemulsions, have been extensively characterized by a number of techniques. Microregion of phase diagram of IL based microemulsions was detected by cyclic voltammetric technique (Gao et al, 2006a), electrical conductivity (Gao et al, 2004;Gao et al, 2006b;Gao et al, 2007b;Gao et al, 2006d;Li et al, 2007b), and direct observation, where the phase boundaries were determined by observing the transition from transparency to turbidity (Cheng et al, 2007a;Cheng et al, 2007b;Cheng et al, 2008;Gao et al, 2005b;. Based on the phase diagram, DLS (Cheng et al, 2007a;Gao et al, 2004;Gao et al, 2006b;Gao et al, 2008b;Gao et al, 2005b;Li et al, 2007b), FFEM (Cheng et al, 2007a;Gao et al, 2004;Gao et al, 2008b), small-angle X-ray scattering (SAXS) and smallangle neutron scattering (SANS) (Eastoe et al, 2005) have been applied to characterize the microemulsions with polar IL cores.…”

“…These techniques proved the swollen of reversed micelle with the addition of IL, which indicated the formation of reversed microemulsion. More detailed information was gained through FTIR (Gao et al, 2006b), 1 H NMR (Gao et al, 2006b;Gao et al, 2008b), UV-vis spectroscopy (Gao et al, 2006b;Gao et al, 2008b;Gao et al, 2005b;Li et al, 2007b) and conductivity measurements (Gao et al, 2006b;Gao et al, 2008b;Li et al, 2005a). Sarkar and his coworkers (Adhikari et al, 2007;Chakrabarty et al, 2005;Seth et al, 2006Seth et al, , 2007aSeth et al, 2007b) initiated the work of applying steady-state and time-resolved fluorescence spectroscopy to investigate IL based microemulsions.…”