2価の荷電分離型陽イオンを対イオンにもつアルキルスルホン酸塩のミセル形成に及ぼす圧力効果

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タイトル別名
  • Pressure Effect on Micellization of Alkane-1-sulfonates with Divalent Cation of Separate Electric Charge as Counterion.
  • Pressure Effect on Micellization of Alk

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Effect of pressure on solution properties at 40.0°C of the alkane-1-sulfonates with divalent cation of separate electric charge as counterion [1, 1'- (1, ω-ethanediyl) bispyridinium dodecanesulfonate and 1, 1'- (1, ω-decanediyl) bispyridinium tetradecanesulfonate] was examined by their critical micelle concentration (cmc). Specific conductivity of the surfactants below the cmc was found to decrease monotonously for the former but to increase for the latter with increasing pressure. This indicated that the latter surfactant with divalent counterion of longer charge separation was in associated form below the cmc and that the association decreased with increasing pressure. The cmc of both surfactants was found to have a maximum around 130 MP as conventional ionic surfactants. The volume change on micellization, ΔVm, was evaluated from the pressure dependence of cmc, and the ΔVm values decreased more for the former than for the latter surfactant. Static and dynamic light scatterings were determined for the micellar solutions, from which 77 and 28 were obtained for the aggregation number and 1.9 and 1.2 nm were obtained for the hydrodynamic radius for the former and the latter, respectively. The smaller aggregation number and the shorter radius were controlled by the divalent cationic counterion of longer charge separation.

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  • 日本油化学会誌

    日本油化学会誌 45 (9), 833-838, 1996

    公益社団法人 日本油化学会

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