of Poly(ethylene glycol) Fluorohexyl Ether
at the Water
Perfluorodecaline Interface and Its Premicellar Association in Aqueous Solutions
N. M. Zadymova and Z. N. Markina
Department of Chemistry, Moscow State University, Vorob’evy gory, Moscow, 119899 Russia
Received April 20, 1996
Abstract—Interfacial tensions of aqueous solutions of fluorinated nonionic surfactant [poly(ethylene glycol)
fluorohexyl ether] were precisely measured under adsorption equilibrium at 293 K within a wide concentration
range. Premicellar association of the surfactant was revealed in the concentration range below CMC, the pre-
associates formed being trimers. Increments of the free energy required to transfer the fluoromethylene group
from an aqueous solution to the interface with fluorodecalin, into the submicelle (trimer) of a nonionic surfac-
tant as well as into the fluorocarbon core of a micelle were estimated. Two-dimensional condensation in
adsorbed layers of surfactant at the water–perfluorodecalin interface was disclosed.
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