In the ice-water system, the principal mechanical difference between the liquid and the solid, the inability of the liquid to support a shear, is reflected in the dielectric properties. In the liquid, the molecular dipole moments easily follow electric fields up to frequencies above 10 to the power 9 Hz. In the solid, the structure prevents them from following fields above frequencies in the audio range. Thus dielectric measurements can tell us rather directly about a particular property which is important in determining the adhesive properties of ice, the rotational mobility of the molecules in the interfacila layer. We have used electrical measurements to study the nature of the molecules at two different ice-solid interfaces. One is the ice-ice interface which occurs between differently oriented grains of ice. The other is the ice-quartz interface. Measurements have been made over a frequency range of d.c. to 10 MHz and over a temperature range 0 to -20 deg C on both pure and NaC1 doped samples. We find that the apparent thickness of the interfacial region depends on the frequency of measurement. That is, more molecules can follow a field of 100 kHz than of 1 MHz. It also depends strongly on temperature and impurity content. Trace impurities appear to play dominant role in the d.c. conductivity at an ice-solid surface interface even when care has been taken to ensure clean surfaces. /Authors/

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    • This paper appeared in TRB Special Report 185, Snow Removal and Ice Control Research. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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  • Authors:
    • Camp, Paul R
    • Halchin, David J
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  • Publication Date: 1979

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  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 35-43
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  • Accession Number: 00193851
  • Record Type: Publication
  • Created Date: Jun 13 1979 12:00AM