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Aggregation behavior and interface properties of mixed surfactant systems gemini 14-s-14/CTABr

Colloids and Surfaces A Physicochemical and Engineering Aspects
DOI: 10.1016/j.colsurfa.2014.06.026
  • Gemini Surfactants
  • Cetyltrimethylammonium Bromide
  • Mixed Micelles
  • Critical Micelle Concentration
  • Surface Potential
  • Solvatochromic Dye


Abstract Mixed micellar systems of cationic gemini 14-s-14 (s=2, 4, 6) and cationic conventional surfactant cetyltrimethylammonium bromide (CTABr) were investigated. The critical micelle concentrations of mixed micelles measured by surface tension, ion selective probe, and conductivity techniques reveal a synergism in the case of 14-2-14/CTABr mixture. Microenvironment and interface properties were studied using bromide selective electrode and by solubilization of a hydrophobic dye Orange OT, solvatochromic dyes Reichardt's betaine and Methyl Orange. Surface potential values, ψ, for mixed micelles are calculated using p-nitrophenol, and are found to be remarkably low for 14-2-14/CTABr systems. These results provide new information for understanding the effect of gemini surfactant structure on the properties of mixed micelles of dicationic/monocationic surfactants.

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