Microemulsions with novel hydrophobic ionic liquids

Microemulsions with hydrophobic ionic liquids: Influence of the structure of the anion

“…In our previous study we examined how an increasing length and number of alkyl chains of the cation influences the phase behavior of a microemulsion, while leaving the NTf 2 -anion unchanged. [21] We found that with an increasing amount of aliphatic chains in the IL from [BMIm]NTf 2 to [C 8 C 8 Im]NTf 2 (1) and finally to [Ali336]NTf 2 , the phase inversion temperature rises and the three-phase region expands. The same behavior is observed when phenylalkanes are used as oil and the number of aliphatic carbon atoms is increased, thus reducing the polarity.…”

“…Starting point and reference system was the phase diagram of the system H 2 O -[C 8 C 8 Im]NTf 2 (1) -TX-100. [21] The resulting fish cuts are plotted in two graphs (see Figure 3) due to the fact that the densities of ILs 1 and 2 are higher than that of water, which changes the designation of and compared to the system with IL 3,which has a density lower than that of water. The characteristic values for all three systems are summarized in Table 2.…”

“…However, only a restricted number of microemulsions in which the oil phase is replaced by an IL has been reported so far. [18][19][20][21][22][23] The surfactant used most often is TX-100 (4-octylphenol polyethoxylate) but also microemulsions with Tween-20 (polyethylene glycol sorbitan monolaurate) [19] or Brij-35 (polyethylene glycol dodecyl ether) [22] are described. The hydrophobic character of the vast majority of -if not even all -ILs applied for this purpose is due to the presence of fluorinated hydrophobic anions, such as PF 6 -or NTf 2 -.…”

“…In the resulting structures the ionic charge is placed in the center of the anion, avoiding an amphiphilic "head-tail" molecular shape similar to the concept for our cation design. [21] The replacement of the trifluoro methyl groups by alkyl chains is expected to reduce the polarity of the IL. The use of less polar ILs, in turn, is expected to enlarge the three-phase region of the microemulsion and should lead to more structured and more efficient microemulsions.…”

Layer-by-layer encapsulated nano-emulsion of ionic liquid loaded with functional material for extraction of Cd2+ ions from aqueous solutions

“…These emulsions therefore must be stable enough for prolonged storage to be available to use on demand. Several methods of stabilisation of ionic liquid nano-and microemulsions have been reported including micro-gel [10], ionic [23] and non-ionic surfactant stabilization methods [24][25][26]. Emulsions fabricated using the aforementioned methods have been reported to be stable, but it is unclear how stable they will be if used for extraction purposes.…”