Abstract
The complex relative electric permittivity of aqueous solutions of zwitterionic surfactants has been measured in the range of 1 MHz to 40 GHz at various concentrations and temperatures. The dipolar head-groups consist of the cationic ((-N+(CH3)2−), (-NH −2 −), (-N+(CH3)3) or (-N+(CH3)2H) )and the anionic (-CO −2 ), (-SO −3 ) or (-PO −4 −) group. An empirical relaxation spectral function and a model spectral function especially developed for solutions of spherical or ellipsoidal micelles have been fitted to the experimental data. From the adjustable parameters the following results have been derived: The ellipsoidal axial ratios cover the range 1 to 5. The reorientation time of the hydration molecules is three times larger than in bulk water. The values of a correlation number for the diffusive motion of the headgroup’s outer ion indicate that the coupling between adjacent zwitterions is weak.
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© 1982 Plenum Press, New York
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Müller, S.C., Pottel, R. (1982). Dielectric Relaxation Spectroscopy of Zwitterionic Surfactants in Aqueous Micellar Solutions. In: Mittal, K.L., Fendler, E.J. (eds) Solution Behavior of Surfactants. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3491-0_26
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DOI: https://doi.org/10.1007/978-1-4613-3491-0_26
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