title: Miscibility of Hydrocarbon and Fluorocarbon Surfactants in Adsorbed Film and Micelle.
abstract: We investigated the miscibility of nonionic hydrocarbon and fluorocarbon surfactants in the adsorbed film and the micelle by surface tension measurements of the aqueous solution. The combination of tetraethyleneglycol monodecyl ether (C10E4) and tetraethyleneglycol mono-1,1,7-trihydrododecafluoroheptyl ether (FC7E4) was chosen because they have the same hydrophilic groups and about the same surface activity. The extent of nonideal mixing was estimated quantitatively in terms of the excess Gibbs energy in the adsorbed film g(H,E) and that in the micelle g(M,E). The excess area per adsorbed molecule, A(H,E), was also evaluated and discussed. The ionic hydrocarbon and fluorocarbon mixed surfactant systems, lithium dodecyl sulfate (LiDS)/lithium perfluorooctane sulfonate (LiFOS) and lithium tetradecyl sulfate (LiTS)/LiFOS systems are also investigated from the standpoint of excess Gibbs energy and excess area. It is also clearly shown that the regular solution approach does not fit in the systems that contain ionic species. Copyright 2001 Academic Press.
authors.affiliation: Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, Minamijosanjima, Tokushima, 770-8506, Japan
authors.forename: Masumi
authors.initials: M
authors.lastname: Villeneuve
authors.forename: Teruko
authors.initials: T
authors.lastname: Nomura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Matsuki
authors.forename: Shoji
authors.initials: S
authors.lastname: Kaneshina
authors.forename: Makoto
authors.initials: M
authors.lastname: Aratono