Mixed Monolayer Properties of Tetradecanoic Acid withn-Perfluorocarboxylic Acids with 10, 12, 14, 16, and 18 Carbon Atoms
✍ Scribed by Osamu Shibata; Shigekazu K. Yamamoto; Sannamu Lee; Gohsuke Sugihara
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 205 KB
- Volume
- 184
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
of sodium perfluorooctanoate with MEGA-9, are well misci-Surface pressure (p) and surface potential (DV ) -area (A) ble in micelles accompanying a negative deviation from ideal isotherms were obtained for mixed monolayers of different perflumixing (2). orocarboxylic acids (FCs) with a hydrocarbon fatty acid, tetra-Various kinds of mixed hydrocarbon monolayers spread decanoic acid (HC14), on a substrate solution of pH 1.0 as a at the air/water interface have been extensively studied by function of compositions in the mixture by employing the Langmany investigators (3-6). Taking into account the above muir method and the ionizing electrode method. Data for the bulk behavior of mixtures of fluorocarbon and hydrocarbon mixed monolayers were analyzed in terms of the additivity rule.
surfactants (1, 2), it is quite interesting to compare their Judging from Matuo's classification of two-dimensional phase diathree-dimensional bulk properties with two-dimensional surgrams, our phase diagrams might be classified into three types.
The first is a positive azeotrope type; the combinations of tetradec-face properties. In addition, the mixed monolayers of peranoic acid (HC14) with perfluorodecanoic acid (FC10) and with fluorocarbon and hydrocarbon fatty acids have been reported perfluorododecanoic acid (FC12) seem miscible with each other. only once previously (7). In order to clarify the effect of The second is a completely immiscible type; the combination of miscibility on the mixed monolayer states, it is better to use perfluorotetradecanoic acid (FC14) and tetradecanoic acid. The molecules whose structures are relatively simple and similar third might be a eutectic type, to which the combinations of HC14 to each other. We previously studied the mixed system of a with FC16 and with FC18 are assigned; they are miscible in the phospholipid (dipalmitoylphosphatidylcholine, DPPC) with expanded state but immiscible in the condensed state. Furtherhydrocarbon as well as fluorocarbon fatty acids and reported more, the data on the mean molecular area, the surface dipole that in the two-dimensional phase or monolayer film phase, moment, and the phase diagrams constructed enabled us to estifluorocarbon acids can form a monolayer well mixed with mate the molecular orientation of the respective acids in the mixed DPPC accompanied by a rather strong intermolecular intermonolayer state.