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Dielectric Properties of Apolar Micelle Solutions Containing Solubilized Water
Author(s) -
Eicke HansFreidrich,
Shepherd John C. W.
Publication year - 1974
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19740570708
Subject(s) - micelle , chemistry , dielectric , solubilization , relaxation (psychology) , conductivity , critical micelle concentration , dipole , thermodynamics of micellization , dispersion (optics) , permittivity , thermodynamics , analytical chemistry (journal) , aqueous solution , chemical engineering , chemical physics , chromatography , organic chemistry , optics , psychology , social psychology , biochemistry , physics , optoelectronics , engineering
Varying amounts of water have been solubilized in a micelle solution of sodium di‐2‐pentyl–sulfoscuccinate in benzene and the complex permittivity has been observed in the range 200 KHz to 10 MHz. Part of a dielectric dispersion is seen, which extends to higher frequencies with a broad distribution of relaxation times. Due to association processes, the static dielectric increment is found to vary non‐linearly with hydrated micelle concentration and with the amount of solubilized water, whereas a linear variation with micelle concentration is found if no water is added. These effects are explained on the assumption that part of the solubilized water increases the dipole moment of the micelle. Additionally, at higher water concentrations, a sudden increase in the conductivity of the solution is observed, which is taken to indicate a conformational change of the solubilized micelle.