The influence of small pores on the anion transport properties of natural argillaceous rocks – A pore size distribution investigation of Opalinus Clay and Helvetic Marl
| Autor: | Arnaud C. A. Muller, Luc R. Van Loon, Thomas Gimmi, Cornelia Wigger |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Pore size
Chemistry Diffusion Mineralogy Geology 02 engineering and technology 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology Co2 adsorption 01 natural sciences Ion Adsorption Geochemistry and Petrology Marl 0210 nano-technology Mercury intrusion porosimetry Clay minerals 0105 earth and related environmental sciences |
| Zdroj: | Applied Clay Science. 156:134-143 |
| ISSN: | 0169-1317 |
| DOI: | 10.1016/j.clay.2018.01.032 |
| Popis: | The pore size distribution of two natural argillaceous rock samples, Opalinus Clay (OPA) and Helvetic Marl (HM) was investigated with five different methods: NMR, NMR cryoporometry, mercury intrusion porosimetry and CO2 adsorption, as well as N2 adsorption. Due to different physical principles of these methods different ranges of pore width could be detected, from micropores ( 50 nm). The aim was to shed light on the role of small pores on the transport properties of natural argillaceous rocks, in particular to explain the differences of anion diffusion in the two argillaceous rock samples. Knowing that Helvetic Marl exhibits a stronger anion exclusion than Opalinus Clay it was hypothesized that HM (with its smaller phyllosilicate and smectite content compared to OPA) has more interlayer equivalent (ILE) pores than OPA. ILE pores are defined as pores so narrow ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect