New Amphoteric Surfactants Containing a 2-Hydroxyalkyl Group. V.

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  • 2-ヒドロキシアルキル基を有する新両性界面活性剤 (第5報)
  • 2 ヒドロキシアルキルキ オ ユウスル シン リョウセイ カイメン カッセイザ
  • Interaction of an Amphoteric Surfactant with Sodium Dodecylbenzenesulfonate in Mixed Micelles
  • 混合ミセルにおける両性界面活性剤とドデシルベンゼンスルホン酸ナトリウムとの相互作用

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Abstract

The interaction mode of amphoteric surfactant, N- (2-hydroxydodecyl) -N- (2-hydroxyethyl) -β-alanine (C12-HAA) with sodium dodecylbenzenesulfonate (LAS) was studied using ultraviolet and fluorescence spectroscopy, and turbidity measurement. Anormality of fluorescence peak intensity was revealed in the higher range above the cmc, depending on the occupied ratio of the components in the binary system, whereas there was no indication of an extra increment in the increase of fluorescence intensity of the LAS component with concentration covering the lower range below the cmc of each binary system. Besides, a great enhancement of turbidity appeared particularly in the neutral region, exhibiting a sharp break at considerably higher concentration. The obvious change of molar extinction for the LAS component in the mixed system is observed in the neighborhood of the base dissociation constant (pK2) of C12-HAA. Hence, the interaction is dependent on pH value. We may conclude that the COO- of C12-HAA and the SO3- of LAS must interact mutually through counterions association in the alkaline region and that a complex formation occurs between the -NH+ <of C12-HAA and the SO3- of LAS by the Coulomb attraction in the neutral region.

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