Complex permittivity of FeCl3/AOT/CCl4 microemulsions probed by ACimpedance spectroscopy

Vincenzo Turco Liveri, Pietro Calandra

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2 Citations (Scopus)


The complex permittivity of FeCl3/AOT/CCl4 microemulsions in the 1–105 Hz frequency range has beenmeasured by the conventional AC complex impedance technique. Measurements as a function of the volumefraction of the dispersed phase (FeCl3 + AOT) and temperature at fixed salt-to-AOT molar ratio (R,R = 0.5) show that the entrapment of FeCl3 clusters significantly enhances the local permittivity of theAOT reverse micelles and the number density of charge carriers resulting from the peculiar state of theconfined inorganic salt. An estimate of the apparent static permittivity of the FeCl3 ionic clustersentrapped in the core of AOT reverse micelles gives the very high and quite surprisingly value of about237.Moreover, a thorough analysis of conductivity data and of their temperature dependence strongly supportsthe hypothesis that the charge transport in these systems is mainly sustained by a mechanism ofhopping consisting in the continuous jumping of charged species within supra-micellar aggregates ofAOT reverse micelles whose aggregation is driven by fluctuating opposite charges on contacting micelles.
Original languageEnglish
Pages (from-to)285-288
Number of pages4
JournalJournal of Colloid and Interface Science
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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