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Dielectric Behaviour of Ice Microcrystals: A Study Versus Temperature

Published online by Cambridge University Press:  30 January 2017

Christian Boned ,
Bernard Lagourette  and
Marc Clausse
Christian Boned
Affiliation:
Université de Pau et des Pays de l'Adour, Institut Universitaire de Recherche Scientifique, Laboratoire de Thermodynamique, Avenue Philippon, F-64000 Pau, France
Bernard Lagourette
Affiliation:
Université de Pau et des Pays de l'Adour, Institut Universitaire de Recherche Scientifique, Laboratoire de Thermodynamique, Avenue Philippon, F-64000 Pau, France
Marc Clausse
Affiliation:
Université de Pau et des Pays de l'Adour, Institut Universitaire de Recherche Scientifique, Laboratoire de Thermodynamique, Avenue Philippon, F-64000 Pau, France
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Abstract

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Dispersions of ice microcrystals were obtained from the breakdown of super-cooling of water-in-oil type emulsions whose disperse phase was either resin-exchanged water or aqueous solutions of NH4C1. Their complex permittivity ϵ* = ϵ′ - ϵ″ was studied versus their temperature T, up to the melting point of the ice microcrystals, by means of an automatically balancing admittance bridge (General Radio 1680A) working at 400 Hz and 1 kHz. The plots ϵ′(T), ϵ″(T), and ϵ″(ϵ′) reveal that these systems exhibit two distinct dielectric relaxations located on both sides of a temperature Tm which was found to be equal to about —20°C in the case of water and lower than —20°C in the case of aqueous solutions of NH4C1. The relaxation located in the lower temperature range arises from the Debye dipolar absorption of ice while the other one could be related to structural changes occurring within the lattice of ice as T approaches its melting point. These results are consistent with those obtained by investigating versus frequency the dielectric behaviour of ice microcrystals, at discrete sub-zero temperatures close to their melting point.

This paper has been accepted for publication in full in a forthcoming issue of the Journal of Glaciology.

Type
Abstracts of Papers Presented at the Symposium but not Published in Full in this Volume
Information
Journal of Glaciology , Volume 21 , Issue 85 , 1978 , pp. 696 - 697
Copyright
Copyright © International Glaciological Society 1978

References

Clausse, M. Unpublished. Contribution à l’étudc des propriétés diélectriques des émulsions. [Dr. ès. Sc. thesis, Université dc Pau et des Pays de l'Adour, 1972.]Google Scholar
Clausse, M., and Royer, R. 1976. Computerized treatment of Hanai's formula, and its application to the study of the dielectric behavior of emulsions. (In Kerker, M., ed. Colloid and interface science. Vol. 2. Aerosols, emulsions, and surfactands. Proceedings of the International Conference on Colloids and Surfaces-50th Colloid and Surface Science Symposium, held in San Juan. Puerto Rico, on June 21-25, 1976. New York, etc., Academic Press Inc., p. 217-32.)Google Scholar
Lagourette, B., and others. 1976. Study of the dielectric properties of disperse micro-crystals of ice near the melting temperature. Section II: discussion and interpretation, [par] B. Lagourette, C. Boned et R. Royer. Journal de Physique, Tom. 37, Nos. 7-8, p. 955-64.Google Scholar