|Budget Amount *help
¥2,200,000 (Direct Cost : ¥2,200,000)
Fiscal Year 1996 : ¥400,000 (Direct Cost : ¥400,000)
Fiscal Year 1995 : ¥1,800,000 (Direct Cost : ¥1,800,000)
Six hybrid surfactants, 1-oxo-1- [(4-fluoroalkyl) phenyl] -2-alkanesulfonates, [F (CF_2)_nC_6H_4COCH (SO_3Na) (CH_2)_m, n=4,6, m=2,4,6], were synthesized. These surfactants were obtained in 54-85% yields and the properties were white powder. Solution properties of hybrid surfactants have been measured in terms of Krafft point, surface tension, n-octane/water and water/perfluoro-n-hexane interfacial tension, and aggregation number of micelles. The Krafft point, the area occupied by a molecule at the air/water and octane/water interfaces, and the aggregation number of micelles increase with an increase of fluorocarbon and/or hydrocarbon chain length, while critical micelle concentration (cmc), surface tension, and octane/water interfacial tension at the cmc decrease with an increase of fluorocarbon and/or hydrocarbon chain length. These surfactants are found to exhibit lower surface tension and hydrocarbon/water and fluorocarbon/water interfacial tension at the same time and make it possible to float a surfactant aqueous solution on a hydrocarbon substance such as benzene.