SANS STUDY OF A FLUORINATED WATER-IN-OIL MICROEMULSION

The experimental results of a SANS analysis of fluorinated water-in-oi l microemulsions with perfluoropolyether oil and surfactant are shown at T = 20 degrees C and T = 35 degrees C for samples with a constant w ater-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 t wo temperatures studied. Furthermore, all the samples studied follow t he Pored law, as expected for dispersed particles with a sharp interfa ce. For the two temperatures studied, a microemulsion interfacial area per surfactant molecule of 50 Angstrom(2) is found in the dilute regi on and about 35 Angstrom(2) in the concentrated region.