Harrar, Agnes and Zech, Oliver and Hartl, Robert and Bauduin, Pierre and Zemb, Thomas and Kunz, Werner (2011) [emim][etSO4] as the Polar Phase in Low-Temperature-Stable Microemulsions. Langmuir 27 (5), pp. 1635-1642.
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The authors demonstrate here that microemulsions with an ionic liq. as the continuous phase can be formed so that they are stable over a wide temp. range and have intermediary properties between flexible and stiff microemulsions. Three components (1-ethyl-3-methylimidazolium ethylsulfate ([emim][etSO4]), limonene, and octylphenol ethoxylate (Triton X100, abbreviated as TX-100)) were used. This ternary system was characterized from ambient temp. down to -10° by cond., 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 also were interpreted in terms of a dimensionless diln. plot, demonstrating that microstructures are neither isolated droplets nor a random flexible film structure but resemble molten liq. 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 liq.; this holds in a temp. range well <0°.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz|
|Keywords:||microemulsion stability ionic liq|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||09 May 2012 11:07|
|Last Modified:||09 May 2012 11:07|