Measure method for the dielectric analysis of perfluoropolyether microemulsions

Author

Giri, M.G. ; Carla, M. ; Gambi, C.M.C. ; Senatra, D. ; Chittofrati, A. ; Sanguineti, A.

Author_Institution

Florence Univ., Italy

fYear

1992

fDate

7-10 Sep 1992

Firstpage

253

Lastpage

255

Abstract

Water-in-oil microemulsions are transparent, optically isotropic, thermodynamically stable, liquid systems consisting of spherical water droplets stabilized by a surfactant shell and dispersed in a continuous hydrocarbon medium. The dielectric behaviour of such systems shows, in the frequency range (10-100)MHz, absorption phenomena caused by interfacial polarization. The authors describe a method for the determination of the dielectric parameters of highly conducting liquid dispersions exhibiting a Maxwell-Wagner absorption at frequencies where also the residual inductance contribution must be taken into account. An example of how the method works will be reported for a three-component water/oil microemulsion consisting of water, perfluoropolyether (PFPE) oil and perfluoropolyether surfactant

Keywords

dielectric loss measurement; dielectric polarisation; emulsions; organic compounds; permittivity measurement; 10 to 100 MHz; Maxwell-Wagner absorption; PFPE; absorption phenomena; continuous hydrocarbon medium; dielectric analysis; frequency range; highly conducting liquid dispersions; interfacial polarization; perfluoropolyether microemulsions; perfluoropolyether oil; perfluoropolyether surfactant; residual inductance; spherical water droplets; surfactant shell; water oil microemulsions;

fLanguage

English

Publisher

iet

Conference_Titel

Dielectric Materials, Measurements and Applications, 1992., Sixth International Conference on

Conference_Location

Manchester

Print_ISBN

0-85296-551-6

Type

conf

Filename

186929