Journal of Surface Science and Technology

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Effect of Free and Bound Water on the Dielectric Properties of Non-Ionic Microemulsions


Affiliations
1 Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
2 Department of Chemistry, Moscow State University, Moscow, Russian Federation
     

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The effects of free and bound water on the dielectric properties of rnicroemulsions prepared with the non-ionic surfactant Brij 97 were investigated. For the calculation of the relative amounts of free and bound water, a simple multi-layered dielectric model was applied. The model considers the microemulsion as a sum of three separate layers consisting of a 'dry' microemulsion, free water and bound water, respectively. The method is based on dielectric measurements of microemulsions at a frequency for which the dielectric permittivity and the dielectric losses for bound and free water have significantly different magnitudes. The dielectric contribution of free water to the relaxation spectrum of the microemulsion can be obtained, allowing both fractions be calculated. In contrast to the traditional procedures used for calculation of bound water from the relaxation spectrum, this method does not involve analyses of overlapping relaxation processes.

Keywords

Dielectric Spectroscopy, Dielectric Permittivity, Dielectric Losses, Microemulsions, Bound Water, Hydration.
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  • Effect of Free and Bound Water on the Dielectric Properties of Non-Ionic Microemulsions

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Authors

Nick Kozlovich
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Ido Nir
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Boris Tsentsiper
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Vladimir I. Zhuravlev
Department of Chemistry, Moscow State University, Moscow, Russian Federation
Abraham Aserin
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Shmaryahu Ezrahi
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Nissim Garti
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Yuri Feldman
Freddy and Nadine Hermann Graduate School of Applied Science and Technology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel

Abstract


The effects of free and bound water on the dielectric properties of rnicroemulsions prepared with the non-ionic surfactant Brij 97 were investigated. For the calculation of the relative amounts of free and bound water, a simple multi-layered dielectric model was applied. The model considers the microemulsion as a sum of three separate layers consisting of a 'dry' microemulsion, free water and bound water, respectively. The method is based on dielectric measurements of microemulsions at a frequency for which the dielectric permittivity and the dielectric losses for bound and free water have significantly different magnitudes. The dielectric contribution of free water to the relaxation spectrum of the microemulsion can be obtained, allowing both fractions be calculated. In contrast to the traditional procedures used for calculation of bound water from the relaxation spectrum, this method does not involve analyses of overlapping relaxation processes.

Keywords


Dielectric Spectroscopy, Dielectric Permittivity, Dielectric Losses, Microemulsions, Bound Water, Hydration.