Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (06): 1565-1569.doi: 10.3866/PKU.WHXB20100610

• COLLOID AND INTERFACE CHEMISTRY • Previous Articles     Next Articles

Synergistic Interactions in Mixed Micelles of Cationic 14-s-14 Gemini with Conventional Surfactants: Spacer and Counterion Effects

AZUM Naved, NAQVI Andleeb Z., AKRAM Mohd., KABIR-UD-DIN   

  1. Department of Chemistry, Aligarh Muslim University, Aligarh-202002, India
  • Received:2009-11-12 Revised:2010-03-02 Published:2010-05-28
  • Contact: KABIR-UD-DIN


The mixed micelle formation of binary cationic 14-s-14 gemini with conventional single chain surfactants was studied by conductivity measurements. The critical micelle concentration (cmc) and the degree of counterion binding values (g) of the binary systems were determined. The results were analyzed by applying regular solution theory (RST) to calculate micellar compositions (X), activity coefficients (f1, f2), and the interaction parameters (β). The synergistic interactions of all the investigated cationic gemini+conventional surfactant combinations were found to be dependent upon the length of hydrophobic spacer of the gemini surfactant. The excess Gibbs free energy of mixing was evaluated, and it indicated relatively more stable mixed micelles for the binary combinations.

Key words: Mixed micelle, Gemini surfactant, Conventional surfactant, Critical micelle concentration, Degree of counterion binding, Synergistic interaction