Abstract
Some DDAB/W/oil phase diagrams have been investigated with the highlight on the microemulsion and emulsion regions. In previous studies it has been demonstrated that DDAB easily forms w/o microemulsions with linear aliphatic and cycloaliphatic oils. In this work the aromatic oils toluene and trifluoromethylbenzene, semifluorinated linear alkane oils of the type C n H 2 n+1 C m F 2 m+1 , and a perfluoropolyether oil have been considered. DDAB is soluble up to ∼30 wt.% in the aromatic oils, whereas it is insoluble in the others. The phase diagrams of DDAB/W/aromatic oil systems show a microemulsion region near the oil–DDAB axis, and up to a water content of ∼15 wt.%. NMR relaxation times and conductivity measurements allowed to characterize the microemulsion structure. The other systems present emulsion areas, which are obtained by a gradual addition of small amounts of water (4–5 wt.%), followed by vigorous mixing. These emulsions have been shown to be stable over more than two years. Optical microscopy and preliminary NMR self-diffusion measurements are presented to give the hint of the microstructural features.
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