SANS study of a fluorinated water-in-oil microemulsion

The experimental results of a SANS analysis of fluorinated water-in-oil microemulsions with perfluoropolyether oil and surfactant are shown at T = 20 degrees C and T = 35 degrees C for samples with a constant water-to-surfactant molar ratio W/S = 11. Under the hypothesis that the system is composed of interacting droplets, by a Guinier analysis of the dilute samples, a droplet radius of 23 Angstrom is found for the two temperatures studied. Furthermore, all the samples studied follow the Pored law, as expected for dispersed particles with a sharp interface. For the two temperatures studied, a microemulsion interfacial area per surfactant molecule of 50 Angstrom(2) is found in the dilute region and about 35 Angstrom(2) in the concentrated region.