Aqueous microemulsions fluorescence techniques

The rate at which the microemulsion droplets exchange the contents of their aqueous cores is another important transport variable. Exchange kinetics have been measured using fluorescence techniques. Dynamic fluorescence quenching has also been used to study micelle size. f The technique is, however, more useful as a tool to explore the exchange kinetics between microemulsion droplets. The systems studied were AOT or didodecyldimethyl ammonium bromide and water in propane up to 100°C and... 

The fluorescence polarization technique is a very powerful tool for studying the fluidity and orientational order of organized assemblies (see Chapter 8) aqueous micelles, reverse micelles and microemulsions, lipid bilayers, synthetic non-ionic vesicles, liquid crystals. This technique is also very useful for probing the segmental mobility of polymers and antibody molecules. Information on the orientation of chains in solid polymers can also be obtained. 

The technique of pyrene fluorescence intensity measurements was proposed to study the particle nucleation mechanisms involved in the 0/W microemulsion polymerization (31). The experimental data showed that microemulsion droplets are the major particle nucleation loci for the polymerization system with the more hydrophobic ST as the monomer. This is followed by the flocculation of latex particles with the remaining droplets. In contrast, the polymer reactions taking place initially in the continuous aqueous phase (homogeneous nucleation) plays an important role in the MMA microemulsion polymerization. 

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