3 research outputs found
Modifying effect of imidazolium-based ionic liquids on surface activity and self-assembled nanostructures of sodium dodecyl sulfate
The effect of four cationic ionic liquids (ILs), 1-butyl-3- methylimidazolium chloride (BMImCl), 1-butyl-3-methylimidazolium bromide (BMImBr), 1-hexyl-3-methylimidazolium chloride (HMImCl), and 1-hexyl-3-methyl-imidazolium bromide (HMImBr) on surface activity and micellization of an anionic surfactant, sodium dodecyl sulfate (SDS), is studied. The thermodynamic data on micellization and surface adsorption are obtained from tensiometry and conductometry. The applicability of UV-visible spectroscopy to study of SDS/IL systems is also investigated using Crystal Violet as the probe. Cyclic voltammetry, dynamic light scattering, and TEM imaging are employed to investigate the size and morphology of aggregates. According to the findings, addition of butyl-chained ILs to aqueous SDS results in only a slight gradual increase in average aggregate size whereas the size of SDS assemblies are dramatically increased upon addition of hexyl-chained ILs. It is proposed that BMIm+ cations of the IL undergo Coulombic attractive interactions with anionic headgroups adsorbed at the micellar surface in aqueous SDS whereas HMIm+ interact through hydrophobic chain-chain attractions as well. Thus, mixed micellization results in formation of vesicles. A micellar phase change from vesicles to micelles takes place at higher [SDS]/[IL] ratios. All of these processes are successfully tracked by the employed techniques
Modifying Effect of Imidazolium-Based Ionic Liquids on Surface Activity and Self-Assembled Nanostructures of Sodium Dodecyl Sulfate
The
effect of four cationic ionic liquids (ILs), 1-butyl-3-methylimidazolium
chloride (BMImCl), 1-butyl-3-methylimidazolium bromide (BMImBr), 1-hexyl-3-methylimidazolium
chloride (HMImCl), and 1-hexyl-3-methyl-imidazolium bromide (HMImBr)
on surface activity and micellization of an anionic surfactant, sodium
dodecyl sulfate (SDS), is studied. The thermodynamic data on micellization
and surface adsorption are obtained from tensiometry and conductometry.
The applicability of UV–visible spectroscopy to study of SDS/IL
systems is also investigated using Crystal Violet as the probe. Cyclic
voltammetry, dynamic light scattering, and TEM imaging are employed
to investigate the size and morphology of aggregates. According to
the findings, addition of butyl-chained ILs to aqueous SDS results
in only a slight gradual increase in average aggregate size whereas
the size of SDS assemblies are dramatically increased upon addition
of hexyl-chained ILs. It is proposed that BMIm<sup>+</sup> cations
of the IL undergo Coulombic attractive interactions with anionic headgroups
adsorbed at the micellar surface in aqueous SDS whereas HMIm<sup>+</sup> interact through hydrophobic chain–chain attractions as well.
Thus, mixed micellization results in formation of vesicles. A micellar
phase change from vesicles to micelles takes place at higher [SDS]/[IL]
ratios. All of these processes are successfully tracked by the employed
techniques