Excimer-Monomer Emission in Alkylbenzenesulfonates: A New Technique for Determining Critical Micellar Concentrations

  • M. Aoudia
  • M. A. J. Rodgers
  • W. H. Wade


Aqueous micellar dispersions of several isomeric alkyl (C12) benzene sulfonates were prepared and examined for fluorescence emission from the benzene residues. Quantitative measurements of the intensities of the monomer and excimer contributions to the fluorescence spectrum as a function of surfactant concentration, when normalized to unit absor- bance, showed biphasic linear behavior. The breakpoint in the plots occurred at the critical micelle, concentration as identified by a fluorescence quenching method and an electron pulse radiolysis technique. It is proposed that this monomer-excimer emission method is a useful tool for determination of the critical micelle concentrations of surfactants containing intrinsic fluorescent probes.


Critical Micelle Concentration Surfactant Concentration Aggregation Number Critical Micellar Concentration Pulse Radiolysis 
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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • M. Aoudia
    • 1
  • M. A. J. Rodgers
    • 2
  • W. H. Wade
    • 3
  1. 1.INES Mecanique de BlidaAlgeria
  2. 2.Center for Fast Kinetics ResearchUniversity of Texas at AustinAustinUSA
  3. 3.Chemistry DepartmentUniversity of Texas at AustinUSA

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