Title: Characterization of multi-scale microstructural features in Opalinus Clay
Authors : Keller, Lukas M.
Schuetz, Philippe
Erni, Rolf
Rossell, Marta D.
Lucas, Falk
Gasser, Philippe
Holzer, Lorenz
Published in : Microporous and Mesoporous Materials
Volume(Issue) : 170
Pages : 83
Pages to: 94
Publisher / Ed. Institution : Elsevier BV
Issue Date: Apr-2013
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Map
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
DOI : 10.1016/j.micromeso.2012.11.029
ISSN: 1387-1811
URI: https://digitalcollection.zhaw.ch/handle/11475/2208
Appears in Collections:Publikationen School of Engineering

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