Comparison Between Phase Behavior of Gemini Imidazoliums and Monomeric Ionic Liquid Surfactants in W/O Microemulsion Systems

Abstract

GRAPHICAL ABSTRACTThe composition and structural parameters of W/O microemulsions containing gemini surfactant 1,4-bis(3-dodecylimidazolium-1-yl)butane bromide [C 12 (Bim) 2 -2Br] and W/O microemulsions containing ionic liquid type surfactant 1-dodecyl-3-methylimidazolium bromide (C 12 mimBr) were studied and compared at different molar ratios of water to surfactant (x o ). The mole fractions of the alcohol in the interfacial layer X i a in C 12 (Bim) 2 -2Br-based systems are always larger than that in C 12 mimBr-based systems. However, the mole fractions of the alcohol in the oil phase X o a are nearly the same for both the systems. The C 12 (Bim) 2 -2Br-based systems have greater absolute values of the Gibbs energy (ÀDG o o!i ) than that of C 12 mimBr-based systems. In the C 12 (Bim) 2 -2Br-based systems, a large number of cosurfactants at the interfacial layer is conducive for the formation of a smaller droplet. The effects of alcohols, alkanes, and salinity on the composition and structural parameters of the two systems were also investigated and discussed.

Formation of Oil/Water Interface by Mixed Surface Active Ionic Liquid-Ethoxylated Alkyl Ether: Energetics, Microstructures, Solvation Dynamics, and Antimicrobial Activity

“…Both long chain SAIL (herein, C 16 mimCl) and ethoxylated alkyl ether (herein, Brij‐58) require the presence of a cosurfactant, typically a medium chain alcohol, in order to form a stable microemulsion . The stabilizing effect of cosurfactant on the interfacial layer results in a widening of the microemulsion areas well as the solubilization efficiency .…”

“…Hence least number of C 16 mimCl molecules requires at the interface, and consequently, 1‐Pn population (n a i ) increases . The increase in the ‐▵G 0 o→i values with increasing concentration of [bmim][BF 4 ] indicates that RTIL promotes the transfer of 1‐Pn from oil to the interfacial layer …”

Investigations on the driving forces of the fluorocarbon surfactant-assisted spontaneous imbibition using thermogravimetric analysis (TGA)

“…Accordingly this process was called emulsication driven natural imbibition (EDNI). 6,[12][13][14] In order to investigate how capillary force and emulsication may affect the chemical imbibition, and what are the predominant controlling factors in the chemical imbibition process, we chose FS-30, a uorocarbon surfactant, as the imbibition enhancer. Compared with the conventional hydrocarbon surfactants, uorocarbon surfactants noticeably impact the wettability and surface tension at relatively low concentration, which was largely attributed to the strong hydrophobic effect of the C-F bonds.…”

Interaction Between Ionic Liquids and Gemini Surfactant: A Detailed Investigation into the Role of Ionic Liquids in Modifying Properties of Aqueous Gemini Surfactant

“…Recently, Chai et al [47] studied the composition and structural parameters of W/O microemulsions containing the gemini imidazolium surfactant and its monomeric form of IL using the dilution method. Li et al [48] has studied the aggregation behavior of a cationic gemini surfactant with methylene spacers in two different protic IL (PIL), propylammonium nitrate (PAN) and butylammonium nitrate (BAN), by small and wide-angle X-ray scattering, polarized optical microscopy and rheology measurements.…”