Zeta potential of porous rocks in contact with mixtures of monovalent and divalent electrolytes
| Autor: | Rudolf Sprik, Luong Duy Thanh, Xuan Ca Nguyen |
|---|---|
| Přispěvatelé: | Soft Matter (WZI, IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Physics::Biological Physics Quantitative Biology::Biomolecules 010504 meteorology & atmospheric sciences Inorganic chemistry Electrolyte 010502 geochemistry & geophysics 01 natural sciences Streaming current Ion Divalent Condensed Matter::Soft Condensed Matter Electrokinetic phenomena Geophysics chemistry Geochemistry and Petrology Ionic strength Zeta potential Porous medium 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Prospecting, 67(5), 1354-1368. Wiley-Blackwell |
| ISSN: | 1365-2478 0016-8025 |
| DOI: | 10.1111/1365-2478.12759 |
| Popis: | The zeta potential is one of the most important parameters influencing the electrokinetic coupling. Most reservoir rocks are saturated or partially saturated by natural water containing various types of ions (mostly monovalent and divalent ions). Therefore, understanding how the zeta potential behaves for mixtures of electrolytes is very important. In this work, measurements of the zeta potential for four different silica-based samples saturated by seven different mixtures of monovalent and divalent electrolytes are then carried out at a fixed ionic strength. It is seen that the magnitude of the measured zeta potential decreases with increasing divalent cation fraction. The experimental results are then explained by a model developed for mixtures of monovalent and divalent electrolytes. The result shows that the theoretical model is able to reproduce the main trend of the variation of the zeta potential with divalent cation fractions. Additionally, the model can fit the experimental data reported in literature well for reasonable values of the input parameters. |
| Databáze: | OpenAIRE |
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