MICELLAR SOLUTION PROPERTIES OF FLUOROCARBON-HYDROCARBON HYBRID SURFACTANTS

Solution properties of sodium -oxo-1-[(4-fluoroalkyl)phenyl]-2-alkanes ulfonates, hybrid surfactants containing a fluorocarbon chain and a hy percarbon chain in the molecule, have been measured in terms of Krafft point, surface tension, n-octane/water and water/perfluoro-n-hexane i nterfacial tension, and aggregation number of micelles. The Krafft poi nt, the area occupied by a molecule at the air/water and octane/water interfaces, and the aggregation number of micelles increase with an in crease of fluorocarbon and/or hydrocarbon chain length, while critical micelle concentration (cmc), surface tension, and octane/water interf acial tension at the cmc decrease with an increase of fluorocarbon and /or hydrocarbon chain length. These surfactants are found to exhibit l ower surface tension and hydrocarbon/water and fluorocarbon/water inte rfacial tension at the same time and make it possible to float a surfa ctant aqueous solution on a hydrocarbon substance such as benzene.