Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (08): 939-943.doi: 10.3866/PKU.WHXB20050823

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Surface Adsorption and Micelle Formation of C9pPHCNa and C10TABr Mixed Aqueous Solutions

MA Yan-hua; JIANG Rong; ZHAO Jian-xi   

  1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002
  • Received:2004-12-22 Revised:2005-02-28 Published:2005-08-15
  • Contact: ZHAO Jian-xi

Abstract: The surface adsorption and micelle formation of the mixed anionic Gemini surfactant (C9pPHCNa) and cationic conventional surfactant (C10TABr) aqueous solutions have been investigated by surface tension method. The synergism occurred in the mixed systems and yielded maximum synergism at the mole fraction of C9pPHCNa in the bulk (α1) equaling to 0.33, where the two components equal electricity mixing in solution. The corresponding minimum values of the critical micelle concentration (cmcT), the surface tension (γcmc) and the total concentration required to reduce 20 mN•m-1 surface tension of water (c20,T) are respectively 0.60 mmol•L-1, 23.5 mN•m-1 and 1.58×10-5 mol•L-1. Over the range of α1 studied, the molar compositions of C9pPHCNa and C10TABr both in the micelle and on the surface are close each other, which reflects strong interaction between the molecules.

Key words: Sodium carboxylate Gemini surfactant, Cationic-anionic surfactant mixtures, Interaction