Depolarisation thermocurrents in oil-in-water emulsions at subzero temperatures

Stable paraffin oil-in-water (OW) emulsions with Tween 20 (polyoxyethylene sorbitan monolaurate) as emulsifier have been prepared over a wide range of concentration. The dielectric behaviour of the emulsions has been studied by the depolarisation thermocurrent (DTC) method in the temperature range 8...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 1982-12, Vol.15 (12), p.2513-2522
Main Authors: Pissis, P, Apekis, L, Christodoulides, C, Boudouris, G
Format: Article
Language:English
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Summary:Stable paraffin oil-in-water (OW) emulsions with Tween 20 (polyoxyethylene sorbitan monolaurate) as emulsifier have been prepared over a wide range of concentration. The dielectric behaviour of the emulsions has been studied by the depolarisation thermocurrent (DTC) method in the temperature range 85-250K, to obtain information about the state of water in the emulsion. Four peaks, numbered I-IV, have been observed at temperatures of about 120, 135, 210 and 235K respectively. The DTC peaks I and II have been attributed to the reorientation of free and bound or hydration H 2 O molecules in the emulsion respectively. Evidence has been obtained that DTC peaks III and IV are due to Tween 20.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/15/12/022