Visual Evidence for Formation of Water‐in‐Ionic Liquid Microemulsions

Studies on formation and percolation in ionic liquids/TX-100/water microemulsions

“…At low levels of water mass fraction (below 0.3), the hydrodynamic diameter values excided 100 nm, with PdI above 0.5, suggesting formation of large W/IL aggregates with broad size distribution. This observations are in agreement with results reported by Behera [34], who determined size distribution of [BMIM][PF 6 ]/TX-100 (1 M)/water with increasing ω (6-12), which is approximately 0.1-0.2 water mass fraction. Further increase of water content results in a fission of IL into channels/clusters.…”

“…It was observed that the stability of lipase in water in ionic liquid (W/IL) microemulsion, especially at incubation temperature of 50°C, was higher than in other microheterogeneous media, and the native structure of lipase may be retained [33]. Behera proposed simple and conclusive method of visual determination of W/IL microemulsions based on the Co 2+ ions [34]. 6 ]/TX-100/water microemulsions, and revealed that static percolation, rather than dynamic one, occurs within the bicontinuous structure [16].…”

Experimental and Theoretical Efforts to Identify the Microstructural Transition of Water to Acetonitrile‐Based Reverse Micelle through Binary Compositions of Polar Solvents

“…Figures A‐D represent the UV/Vis absorption spectra of CoCl 2 solubilized in RMs as a function of added content of polar phase (100%, 50% and 10% v/v of water and 100% v/v of ACN). The absorbance of Co II in DDAB/Cy RMs showed a broad band at 525–725 nm region comprised of a few convoluted peaks similar to earlier reports . Interestingly, for aqueous RMs, an extra band appears at near 510 nm, which is a characteristic of the absorbance of Co II in aqueous medium.…”

“…Even in ACN‐rich RMs (10% water, v/v), the band at 510 nm was found to be absent. These changes in the spectral behaviour of Co II are because Co II is initially solvated within DDAB/Cy solution with no water, thus predominantly existing as tetra‐coordinated species . When water content in mixed binary solvent based‐RMs increases, it exists in a dispersed form associated with the surfactant monomers within the solution through H‐bonding.…”

Phase Manifestation and Formation of Nanoemulsions Composed of Imidazolium-based Ionic Liquid, Tween 80/Span 80 and Labrafac Lipophile WL 1349

“…In most of the studies on ILbased microemulsions, the IL, such as 1-butyl-3-methylimidazolium tetrafluoroborate (C 4 mim) (BF 4 ), was used as a replacement for water . Nevertheless, some ILs may serve as an appropriate replacement for oil phase, such as 1-butyl-3-methylimidazolium hexafluorophosphate (C 4 mim) (PF 6 ) Behera, Malek & Pandey 2009). Long alkyl chain ILs can also be used as surfactants, which are named as surface-active ionic liquids (Zech et al 2009;Govind et al 2012).…”