Dielectric properties of alcohol electrolyte solutions |
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Authors: | Bo Gestblom Johan Sjöblom |
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Institution: | (1) Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden;(2) Institute for Surface Chemistry, Box 5607, 114 86 Stockholm, Sweden |
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Abstract: | Dielectric properties of ethanol and 1-hexanol solutions containing LiCl, CaCl2·2H2O and Ca(NO3)2·4H2O, respectively, have been determined. It is found that LiCl reduces the static permittivity in ethanol, but CaCl2·2H2O and Ca(NO3)2·4H2O both give an initial increase in s. All the electrolytes studied increase the mean relaxation time of the ethanol solutions. In 1-hexanol the static permittivity is rather invariant for all studied electrolytes at low concentrations, while the same lengthening of the mean relaxation time is observed. When water is added in addition to the hydration water of the electrotyte, the static permittivity in hexanol is almost unaltered while the relaxation time is drastically shortened. The experimental result is discussed in terms of a formation of ion pairs, solvation sheaths, and kinetic depolarization, a partial release of hydration water and a structuring influence on the alcohol structure by the hydrated cation. |
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Keywords: | Dielectric permittivity relaxation time domain spectroscopy (TDS) alcohol electrolyte hydration |
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