| Popis: |
A theory has been developed for calculating interlayer conductivity for natural porous systems, such as sedimentary rocks. As the materials investigated are mainly made up of silica and alumina minerals, an electrical double layer can be presumed, which carries the physical process. A new approach has been attempted by modelling the geometrical conditions. A self-similarity model has been established for describing the porous medium, the parameters of which can be derived from physical measurements. The considerations are based on the fact that the pore wall surface is structured in all orders of magnitude in such a way that the theory of fractal dimensions is applicable. Apart from the geometrical constraints, the electrochemical conditions and limitations are discussed. Experimentally, a set of sedimentary rocks were investigated for nine physical properties. A mean charge density calculated from interlayer conductivity gave a relatively high value close to that from cation-exchange capacity measurements. |
