title: [emim][etSO4] as the polar phase in low-temperature-stable microemulsions.
abstract: We demonstrate here that microemulsions with an IL as the continuous phase can be formed so that they are stable over a wide temperature range and have intermediary properties between flexible and stiff microemulsions. Three components (1-ethyl-3-methylimidazolium ethylsulfate ([emim][etSO(4)]), limonene, and octylphenol ethoxylate (Triton X 100, abbreviated as TX-100)) were used. This ternary system has been characterized from ambient temperature down to -10 °C by means of conductivity, viscosity, and small-angle X-ray scattering (SAXS) measurements. The SAXS data exhibit a characteristic single, broad scattering peak in conjunction with a typical q(-4) decay at large q values. The SAXS data have also been interpreted in terms of a dimensionless dilution plot, demonstrating that microstructures are neither isolated droplets nor a random flexible film structure but resemble molten liquid crystals (i.e., they are formed from locally cylindrical or planar structures). This semirigidity is attributed to a good match between the surfactant and the ionic liquid; this holds in a temperature range well below 0 °C.
authors.affiliation: Institute of Physical and Theoretical Chemistry, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Agnes
authors.initials: A
authors.lastname: Harrar
authors.forename: Oliver
authors.initials: O
authors.lastname: Zech
authors.forename: Robert
authors.initials: R
authors.lastname: Hartl
authors.forename: Pierre
authors.initials: P
authors.lastname: Bauduin
authors.forename: Thomas
authors.initials: T
authors.lastname: Zemb
authors.forename: Werner
authors.initials: W
authors.lastname: Kunz