Radiation Induced Redox Reactions in Micellar Solutions

  • A. J. Frank

Abstract

This paper outlines some recent observations made during pulse radiolysis of fast redox reactions in aqueous solutions containing micellar aggregates. The dismutation kinetics of Br 2 radicals in micellar cetyltrimethylammonium bromide solution is reported. Two-dimensional intramicellar surface diffusion and three-dimensional inteamicellar (or solution bulk type) diffusion can be distinguished. Similarly a two-component kinetic feature is resolved in the electron-transfer reaction between triplet pyrene, located in the interior of the micelle, and Br 2 radicals in the surrounding aqueous phase. The kinetics of the electron transfer of singlet and triplet pyrene in micelles with various radical ions (CO 2 , CH2O,CH3CHO, and CH3COCH3 ) in aqueous solutions containing micelles are reported. In addition the affect of the interface potential on the reaction rates of the hydrated electron and ethanol radical with various acceptor molecules differing in their electron affinity are also considered. These results are discussed in terms of current theories on electron-transfer reactions. The movement of the electron from the aqueous phase across the electrical double layer of the micelle to an acceptor molecule solublized in the micelle is related to the favorableness of electron tunneling.

Keywords

Aldehyde Pyrene CTAB Photolysis Phenothiazine 

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • A. J. Frank
    • 1
  1. 1.Hahn-Meitner-Institut für KernforschungBerlin GmbH Bereich StrahlenchemieBerlin 39Germany

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