2.2. Microemulsion
Phase behavior studies were performed in order to construct the phase diagrams of the systems tested at room temperature (26 °C), and to determine the extent of the microemulsion regions. A pseudoternary system comprising distilled water, vegetable oil and a fixed cosurfactant/surfactant ratio of 0.5 was investigated.
The phase boundaries in the diagram were named according to the Winsor classification (Winsor, 1948 and Friberg and Bothorel, 1987). In these systems, the oil phase was added to the cosurfactant/surfactant mixture, and the resultant solution was titrated with water until the Winsor regions were detected. The volume of added water was recorded to determine the extent of each region. The pseudoternary phase diagram was thereby constructed by plotting the points with the corresponding amounts of water, oil, surfactant and cosurfactant used in the experiments.
After constructing the phase diagram, one point was selected within the microemulsion region to represent the overall composition of that system. The microemulsion was then prepared with a mechanical stirrer, and all components were added at the same time, and allowed to mix for about 30 min
2.2. Microemulsion
Phase behavior studies were performed in order to construct the phase diagrams of the systems tested at room temperature (26 °C), and to determine the extent of the microemulsion regions. A pseudoternary system comprising distilled water, vegetable oil and a fixed cosurfactant/surfactant ratio of 0.5 was investigated.
The phase boundaries in the diagram were named according to the Winsor classification (Winsor, 1948 and Friberg and Bothorel, 1987). In these systems, the oil phase was added to the cosurfactant/surfactant mixture, and the resultant solution was titrated with water until the Winsor regions were detected. The volume of added water was recorded to determine the extent of each region. The pseudoternary phase diagram was thereby constructed by plotting the points with the corresponding amounts of water, oil, surfactant and cosurfactant used in the experiments.
After constructing the phase diagram, one point was selected within the microemulsion region to represent the overall composition of that system. The microemulsion was then prepared with a mechanical stirrer, and all components were added at the same time, and allowed to mix for about 30 min
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