Influence of Alkyl Chain Length and Position on Microenvironmental Properties of Alkylbenzenesulfonates Micelles

Abstract

Microenvironmental properties of alkylbenzenesulfonates micelles with different alkyl substituents were investigated by the fluorescence probe technique. The results showed that the micropolarity of micelles decreased and the microviscosity of micelles increased with lengthening of additional short alkyl substituents, while the micropolarity of micelle was unchanged and the microviscosity of micelles increased obviously with increase of the branched-alkyl chain. The different steric effect between additional alkyl chain and branched-alkyl chain affected the self-aggregation behavior of surfactants strongly.

Keywords:

• Fluorescence polarization
• fluorescence probe
• microenvironmental properties of micelle
• pyrene
• rhodamine 6G

Notes

^a C _py: 1.0 × 10⁻⁶ mol/L.

^a C _R6G: 1.0 × 10⁻⁶ mol/L.