Intermicellar exchange dynamics of solubilized reactants

Room temperature phosphorescence of 6-bromo-2-naphthol in micelles of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers and in their mixed aggregates with sodium dodecyl sulfate

Room temperature phosphorescence (RTP) of 6-bromo-2-naphthol has been investigated in aqueous micellar solutions of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers as well as in their mixed aggregates with sodium dodecyl sulfate. RTP of the phosphorophor was enhanced to some extent in the micelles of the block copolymers. However, marked enhancement of RTP was observed in the mixed aggregates. The enhancement of RTP is attributed to effective incorporation of the phosphorophor into the micelles and the aggregates, resulting in suppression of nonradiative deactivation of the phosphorescent state.

Interactions of neutral molecules with ionic micelles

The interactions of neutral molecules with ionic micelles are analyzed. The cell and mass action models are presented in order to provide a semi-quantitative description of the solubilization process. Both approaches are discussed from a thermodynamic and kinetic point of view and the different definitions of solute incorporation constants are also discussed and compared. An extensive compilation of standard free energies of transfer from water to micelles is provided and the basis of the employed methods to obtain them is presented. Several aspects of the solubilization process such as its dynamics, the effect of additives, the probe microenvironment and its dependence with the solute mean occupation number are reviewed and critically discussed. The effect of solute incorporation upon the micelle shape and size is also briefly reviewed.