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- W2008350854 abstract "ABSTRACT This paper is devoted to study the effect of saturation, with distilled water, on AC electrical conductivity and dielectric constant of a fully and partially saturated hematitic sandstone sample (Aswan area, Egypt). The saturation of the sample was changed from full saturation to partial saturation by air drying. Complex resistivity measurements at room temperature (∼16° C) were performed in the frequency range from 10 Hz to 100 kHz. We used non‐polarizing Cu/CuSO 4 gel electrodes. Experimental electrical spectra indicate, generally, that the electrical conductivity and dielectric constant vary strongly with water saturation and frequency. The low‐frequency electrical conductivity and dielectric constant are supposed to be mainly controlled by surface conduction and polarization of the electrical double layer. Power law behaviours with frequency were noticed. The change in electrical conductivity and dielectric constant with increasing water content is fast at low saturations and slow at high saturations. The behaviour of the electrical conductivity and dielectric constant, with increasing water content, was argued to be the orientational polarization of bound water for very low saturations, displacement of the excess surface charges for relatively low saturations and free exchange of excess ions in double layer with the bulk electrolyte and generation of transient diffusional potentials, which lag behind the applied field for high saturations in addition to membrane polarization on clay and at inter‐grain and grain surface water throats having selective charge transport properties. Also, from the data a semi‐percolation behaviour was found that has a peak of dielectric constant at a certain concentration and an abrupt change in conductivity at another saturation." @default.
- W2008350854 created "2016-06-24" @default.
- W2008350854 creator A5068615190 @default.
- W2008350854 date "2009-10-08" @default.
- W2008350854 modified "2023-10-16" @default.
- W2008350854 title "Saturation effect on electrical properties of hematitic sandstone in the audio frequency range using non-polarizing electrodes" @default.
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- W2008350854 doi "https://doi.org/10.1111/j.1365-2478.2009.00797.x" @default.
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