Complex permittivity of FeCl3/AOT/CCl4 microemulsions probed by AC impedance spectroscopy

Vincenzo Turco Liveri, Pietro Calandra

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

The complex permittivity of FeCl3/AOT/CCl4 microemulsions in the 1–105 Hz frequency range has been measured by the conventional AC complex impedance technique. Measurements as a function of the volume fraction 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 the AOT reverse micelles and the number density of charge carriers resulting from the peculiar state of the confined inorganic salt. An estimate of the apparent static permittivity of the FeCl3 ionic clusters entrapped in the core of AOT reverse micelles gives the very high and quite surprisingly value of about 237. Moreover, a thorough analysis of conductivity data and of their temperature dependence strongly supports the hypothesis that the charge transport in these systems is mainly sustained by a mechanism of hopping consisting in the continuous jumping of charged species within supra-micellar aggregates of AOT reverse micelles whose aggregation is driven by fluctuating opposite charges on contacting micelles.
Lingua originaleEnglish
pagine (da-a)285-288
Numero di pagine4
RivistaJournal of Colloid and Interface Science
Volume337
Stato di pubblicazionePublished - 2009

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Microemulsions
Micelles
Permittivity
Spectroscopy
Salts
Charge carriers
Charge transfer
Agglomeration
Temperature

All Science Journal Classification (ASJC) codes

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

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title = "Complex permittivity of FeCl3/AOT/CCl4 microemulsions probed by AC impedance spectroscopy",
abstract = "The complex permittivity of FeCl3/AOT/CCl4 microemulsions in the 1–105 Hz frequency range has been measured by the conventional AC complex impedance technique. Measurements as a function of the volume fraction 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 the AOT reverse micelles and the number density of charge carriers resulting from the peculiar state of the confined inorganic salt. An estimate of the apparent static permittivity of the FeCl3 ionic clusters entrapped in the core of AOT reverse micelles gives the very high and quite surprisingly value of about 237. Moreover, a thorough analysis of conductivity data and of their temperature dependence strongly supports the hypothesis that the charge transport in these systems is mainly sustained by a mechanism of hopping consisting in the continuous jumping of charged species within supra-micellar aggregates of AOT reverse micelles whose aggregation is driven by fluctuating opposite charges on contacting micelles.",
keywords = "Solubilization Confinement effects Ferric chloride AOT reverse micelles Ionic clusters",
author = "{Turco Liveri}, Vincenzo and Pietro Calandra",
year = "2009",
language = "English",
volume = "337",
pages = "285--288",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",

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TY - JOUR

T1 - Complex permittivity of FeCl3/AOT/CCl4 microemulsions probed by AC impedance spectroscopy

AU - Turco Liveri, Vincenzo

AU - Calandra, Pietro

PY - 2009

Y1 - 2009

N2 - The complex permittivity of FeCl3/AOT/CCl4 microemulsions in the 1–105 Hz frequency range has been measured by the conventional AC complex impedance technique. Measurements as a function of the volume fraction 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 the AOT reverse micelles and the number density of charge carriers resulting from the peculiar state of the confined inorganic salt. An estimate of the apparent static permittivity of the FeCl3 ionic clusters entrapped in the core of AOT reverse micelles gives the very high and quite surprisingly value of about 237. Moreover, a thorough analysis of conductivity data and of their temperature dependence strongly supports the hypothesis that the charge transport in these systems is mainly sustained by a mechanism of hopping consisting in the continuous jumping of charged species within supra-micellar aggregates of AOT reverse micelles whose aggregation is driven by fluctuating opposite charges on contacting micelles.

AB - The complex permittivity of FeCl3/AOT/CCl4 microemulsions in the 1–105 Hz frequency range has been measured by the conventional AC complex impedance technique. Measurements as a function of the volume fraction 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 the AOT reverse micelles and the number density of charge carriers resulting from the peculiar state of the confined inorganic salt. An estimate of the apparent static permittivity of the FeCl3 ionic clusters entrapped in the core of AOT reverse micelles gives the very high and quite surprisingly value of about 237. Moreover, a thorough analysis of conductivity data and of their temperature dependence strongly supports the hypothesis that the charge transport in these systems is mainly sustained by a mechanism of hopping consisting in the continuous jumping of charged species within supra-micellar aggregates of AOT reverse micelles whose aggregation is driven by fluctuating opposite charges on contacting micelles.

KW - Solubilization Confinement effects Ferric chloride AOT reverse micelles Ionic clusters

UR - http://hdl.handle.net/10447/40265

M3 - Article

VL - 337

SP - 285

EP - 288

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

ER -