Abstract
The molecular structure of aqueous micellar solutions and microemulsions is studied by spectroscopic methods, employing molecules that respond to polarity. The spectroscopic methods used are: fluorescence (spectra, lifetimes and quenching studies) and NMR. In the fluorescence experiments, the probe molecules are present in extremely low concentration (below 10−6 M), thereby minimizing the possible perturbation of the probe environment. The probes are predominantly solubilized in the micellar phase. Their location can be investigated utilizing NMR spectroscopy (ring current effect).
Dedicated to Professor Friedrich Boberg on the occasion of his 60th birthday.
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References
Present address: Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32-46, 02-668 Warszawa, Poland.
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The patterns of ΔΔσ (Figure 3) represent the product of two distributions, the distribution of the probe molecule with respect to the various H atoms in the surfactant molecule and the distribution of these H atoms between the micellar surface and center.17 The central micellar region is considered to be a volume, comprising a large part of the total volume of the (dynamic) micelle, down from the γ-CH2 group to the center (see text).
The fact that the decays are single exponential indicates that the shortening of the lifetime is not due to the presence of probe molecules in the bulk aqueous phase (see Table II).
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Zachariasse, K.A., Kozankiewicz, B., Kühnle, W. (1984). Micellar Structure and Water Penetration Studied by NMR and Optical Spectroscopy. In: Mittal, K.L., Lindman, B. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2280-9_35
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