|Title:||Characterization of multi-scale microstructural features in Opalinus Clay|
|Authors :||Keller, Lukas M.|
Rossell, Marta D.
|Published in :||Microporous and Mesoporous Materials|
|Publisher / Ed. Institution :||Elsevier BV|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (Publication)|
|Subject (DDC) :||620.11: Engineering materials|
|Abstract:||STEM-, FIB- and X-ray tomography were applied to a sample taken from the Opalinus Clay unit. This allowed characterization of the pore structure in the fine-grained clay matrix at different levels of microstructural detail. On the level of detail that can be resolved by FIB-nt, the observed pore space is largely unconnected and the resolved porosity was in the 2–3 Vol.% range. At higher optical magnification but for smaller sample sizes, STEM tomography resolved a porosity of around 13 Vol.%. This suggests that the transition from an unconnected to a connected pore space in the shale sample occurs on the few nanometer scale. Geometric analyses of larger pores as visualized by FIB-nt revealed that dilation induced formation of bridges of only a few hundred nanometers between tips of neighboring pores may lead to a coalescence of larger pores. The resulting large pore network may allow for gas transport in the fine-grained clay matrix.|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Computational Physics (ICP)|
|Publication type:||Article in scientific Journal|
|Appears in Collections:||Publikationen School of Engineering|
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