Characterization of multi-scale microstructural features in Opalinus Clay

Keller, Lukas M.; Schuetz, Philippe; Erni, Rolf; Rossell, Marta D.; Lucas, Falk; Gasser, Philippe; Holzer, Lorenz

doi:10.1016/j.micromeso.2012.11.029

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
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
DOI:	10.1016/j.micromeso.2012.11.029
Published in:	Microporous and Mesoporous Materials
Volume(Issue):	170
Page(s):	83
Pages to:	94
Issue Date:	Apr-2013
Publisher / Ed. Institution:	Elsevier
ISSN:	1387-1811
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.
URI:	https://digitalcollection.zhaw.ch/handle/11475/2208
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Keller, L. M., Schuetz, P., Erni, R., Rossell, M. D., Lucas, F., Gasser, P., & Holzer, L. (2013). Characterization of multi-scale microstructural features in Opalinus Clay. Microporous and Mesoporous Materials, 170, 83–94. https://doi.org/10.1016/j.micromeso.2012.11.029

Keller, L.M. et al. (2013) ‘Characterization of multi-scale microstructural features in Opalinus Clay’, Microporous and Mesoporous Materials, 170, pp. 83–94. Available at: https://doi.org/10.1016/j.micromeso.2012.11.029.

L. M. Keller et al., “Characterization of multi-scale microstructural features in Opalinus Clay,” Microporous and Mesoporous Materials, vol. 170, pp. 83–94, Apr. 2013, doi: 10.1016/j.micromeso.2012.11.029.

KELLER, Lukas M., Philippe SCHUETZ, Rolf ERNI, Marta D. ROSSELL, Falk LUCAS, Philippe GASSER und Lorenz HOLZER, 2013. Characterization of multi-scale microstructural features in Opalinus Clay. Microporous and Mesoporous Materials. April 2013. Bd. 170, S. 83–94. DOI 10.1016/j.micromeso.2012.11.029

Keller, Lukas M., Philippe Schuetz, Rolf Erni, Marta D. Rossell, Falk Lucas, Philippe Gasser, and Lorenz Holzer. 2013. “Characterization of Multi-Scale Microstructural Features in Opalinus Clay.” Microporous and Mesoporous Materials 170 (April): 83–94. https://doi.org/10.1016/j.micromeso.2012.11.029.

Keller, Lukas M., et al. “Characterization of Multi-Scale Microstructural Features in Opalinus Clay.” Microporous and Mesoporous Materials, vol. 170, Apr. 2013, pp. 83–94, https://doi.org/10.1016/j.micromeso.2012.11.029.