Abstract
The evaporation rate of aerosol OT-water-n-heptane inverse micellar systems was studied. The evaporation behavior of solutions was strongly affected when compared with pure heptane. The changes are related to the structure of the micelles and the properties of the water molecules dissolved in the micelles. The initial rate of evaporation reaches a maximum when the surfactant head groups are hydrated with three water molecules, a minimum when the first hydration shell of Na+ ions is completed, and then rises and stabilizes until the second hydration shell is completed. The presence of free water when the ratio water molecules to surfactant molecules exceeds 12 produces a new rise of the initial evaporation rate, which is always higher than that of puren-heptane.
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