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- W1966402571 abstract "Mixed Langmuir-Blodgett (LB) films composed of a cationic gemini surfactant, [C(18)H(37)(CH(3))(2)N(+)-(CH(2))(s)-N(+)(CH(3))(2)C(18)H(37)],2Br(-) (18-s-18 with s = 3, 6, 8, 10 and 12), and a fatty acid of stearic acid (SA) were studied by the pi-A isotherm measurement, as well as by AFM and FT-IR. The analysis of the mean molecular area, the excess area and the excess Gibbs free energy from pi-A isotherms suggests the existence of attractive interactions between 18-s-18 and SA molecules in the mixed monolayers. The spacer group of 18-s-18 plays a very important role in the surface properties of 18-s-18/SA mixed monolayers. When s < or = 8, 18-s-18 and SA are completely miscible, while partially miscible mixed monolayers are presented when s > 8. Especially, in the latter case, when s = 12, phase separation appears in two composition regions of X(SA) = 0.4-0.75 and X(SA) = 0.75-0.85, respectively. This miscible phenomenon is confirmed by AFM observation. The result of FT-IR indicates that when X(SA) < or = 0.67, SA could ionize completely and form a cationic-anionic surfactant with 18-s-18 owing to the electrostatic interaction between the head groups, while when X(SA) > 0.67, SA only partially ionizes, -COO(-) and -COOH coexist in mixed monolayers." @default.
- W1966402571 created "2016-06-24" @default.
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- W1966402571 date "2010-04-15" @default.
- W1966402571 modified "2023-10-16" @default.
- W1966402571 title "Influence of Spacer of Gemini on the Interactions between Cationic Gemini Surfactant and Stearic Acid in Mixed Monolayers" @default.
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- W1966402571 doi "https://doi.org/10.1021/la1003287" @default.
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