Dielectric Properties of Water-Containing Porous Materials: Low Frequency Response of Sandstones
2013 (English)In: ISEMA 2013: Proceedings of the 10th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances / [ed] Klaus Kupfer and Norman Wagner, Weimar, Germany: MFPA Weimar , 2013, 195-202 p.Conference paper (Refereed)
We present results of dielectric spectroscopy measurements on natural sandstones, where the pores were impregnated with water solutions of different conductivity. The measurements were fitted to an equivalent circuit containing a high-frequency Maxwell-Wagner relaxation and a low frequency response due to ion conduction and relaxation in the electrochemical double layer at the interfaces between the solid grains and the water. We propose a novel expression for the low frequency response based on a transmission line model. We also study in detail the shape of the Maxwell-Wagner relaxation in samples of porous polypropylene impregnated with transformer oil.
Place, publisher, year, edition, pages
Weimar, Germany: MFPA Weimar , 2013. 195-202 p.
dielectric relaxation, electrical conductivity, sandstone, porosity
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Engineering Science with specialization in Solid State Physics
IdentifiersURN: urn:nbn:se:uu:diva-210793OAI: oai:DiVA.org:uu-210793DiVA: diva2:664362
10th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances; 25-27 September 2013; Weimar, Germany