Adsolubilization of 2-Naphthol by Cationic Multi-chained Surfactants at Silica/Water Interface

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  • ESUMI Kunio
    Department of Applied Chemistry and Institute of Colloid and Interface Science, Tokyo University of Science
  • TSURUMI Daisuke
    Department of Applied Chemistry and Institute of Colloid and Interface Science, Tokyo University of Science
  • YOSHIMURA Tomokazu
    Department of Applied Chemistry and Institute of Colloid and Interface Science, Tokyo University of Science

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Other Title
  • シリカ/水界面での陽イオン性多鎖型界面活性剤による2-ナフトールの吸着可溶化

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Adsolubilization of 2-naphthol by cationic multi-chained surfactants such as gemini (m-2-m, m=alkyl chain length; 10-2-10, 12-2-12) and trimeric surfactants (m-2-m-2-m; 10-2-10-2-10, 12-2-12-2-12) on silica has been investigated. For comparison, a similar experiment has been performed using a cationic single-chained surfactant, dodecyltrimethylammonium bromide (DTAB). Adsorption of the surfactants increases with an increase of the concentration and reaches a saturation, while adsolubilization of 2-naphthol increases and shows a maximum and then decreases with the surfactant concentration for all the surfactant systems. The ratio of maximum amount of 2-naphthol adsolubilized to the adsorbed amount of surfactant on silica is decreased as in the order, 10-2-10-2-10>>12-2-12-2-12>>12-2-12=DTAB>>10-2-10. In addition, the order of the ratio per one-hydrocarbon chain is 10-2-10-2-10 =12-2-12>>12-2-12-2-12=10-2-10, where the ratio of DTAB is considerably large compared to those of the multichained surfactants. These results can be interpreted by the compactness of surfactant adsorbed layer. The effect of the surfactant structure on the adsolubilization is also discussed using admicellar partitioning coefficients of 2-naphthol.

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