Abstract
Fluorine chemical shifts are reported for water/oil/soap/butanol microemulsions in which the soap is potassium 11-(2,2,2-trifluoroethoxy)undecanoate and the oil is 1-(2,2,2-trifluoroethoxy)hexane or a mixture of this material with heptane. In many of the solutions the two fluorinated compounds appear to have identical microenvironments. This reinforces arguments presented recently by others to the effect that microemulsions do not always contain distinct oil-rich and water-rich domains separated by a well-defined interfacial layer.
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