Interaction of Acid Dyes with Sodium Dodecyl Sulfate in Adsorbed Film and Micelle

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  • 吸着膜およびミセル中における酸性染料と硫酸ドデシル=ナトリウムとの相互作用
  • キュウチャク マク オヨビ ミセルチュウ ニ オケル サンセイ センリョウ ト

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The surface tension of an aqueous solution of sodium dodecyl sulfate (SDS) and dye mixture was measured as a function of total concentration of SDS and dye and the composition of SDS at 298. 15 K and atmospheric pressure. Two monoazo acid dyes were used, C. I. Acid Orange 7 (Orange II) and C. I. Acid. Yellow 36 (Metanil Yellow). Adsorbed film and micelle compositions were determined by applying thermodynamic equations to the experimental results. Orange II molecules were forced more strongly than Metanil Yellow molecules to move away from the adsorbed film and micelle owing to the presence of SDS molecules. The present findings may adequately explain why an anionic surfactant acts as a leveling agent in dyeing.

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