Physicochemical properties of α, ω-type bolaform surfactant in aqueous solution. Eicosane-1,20-bis(triethylammonium bromide) |
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Authors: | K Ikeda M Yasuda M Ishikawa K Esumi K Meguro W Binana-Limbele R Zana |
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Institution: | (1) Present address: Department of Applied Chemistry, Institute of Colloid and Interface Science, Science University of Tokyo, Kagurazaka, Shinjuku-ku, Tokyo, Japan;(2) Institut C. Sadron (CRM-EAHP), CNRS, Strasbourgh, France |
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Abstract: | The physicochemical properties of the , - type (bolaform) surfactant, eicosane-1, 20-bis(triethylammonium bromide) (C20Et6), in aqueous solution have been investigated by means of surface tension, electrical conductivity, dye solubilization, and time-resolved fluorescence quenching (determination of average micelle aggregation number). Using electrical conductivity, the critical micelle concentration of C20Et6 was found to be 6.0×10–3 mol dm–3 and the ionization degree of C20Et6 micelle was found to be 0.42. From surface tension measurments, the molecular area of C20Et6 at the air-water interface was about twice that of normal type surfactants such as dodecyltrimethylammonium bromide (DTAB). The solubilizing power of micellar solution of C20Et6 toward Orange OT was 1.0×10–2 mole of dye per mole of surfactant, i. e., slightly smaller than that of DTAB. The micelle aggregation number,N, was found to be 17±2 by time-resolved fluorescence quenching. C20Et6 showed a very small temperature dependence ofN, much less than for normal surfactants. |
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Keywords: | " target="_blank">gif" alt="agr" align="BASELINE" BORDER="0"> -typesurfactant" target="_blank">gif" alt="ohgr" align="BASELINE" BORDER="0">-typesurfactant bolaform criticalmicelleconcentration aggregationnumber surfacearea |
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