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Local Porosity Measurement From Scanning Electron Microscopy Images in the Backscattered Electrons Mode

Published online by Cambridge University Press:  03 December 2020

Loïc Sorbier Open the ORCID record for Loïc Sorbier [Opens in a new window] ,
Hedwige Poncet ,
Vincent Lecocq ,
Guillaume Maillet ,
Marwa Moula  and
Vincent Le Corre Open the ORCID record for Vincent Le Corre [Opens in a new window]
Loïc Sorbier*
Affiliation:
IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360Solaize, France
Hedwige Poncet
Affiliation:
IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360Solaize, France
Vincent Lecocq
Affiliation:
IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360Solaize, France
Guillaume Maillet
Affiliation:
IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360Solaize, France
Marwa Moula
Affiliation:
IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360Solaize, France
Vincent Le Corre
Affiliation:
IFP Energies nouvelles, Rond-point de l'échangeur de Solaize, BP 3, 69360Solaize, France
*
*Author for correspondence: Loïc Sorbier, E-mail: loic.sorbier@ifpen.fr
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Abstract

We propose a method to measure the local porosity of porous samples from scanning electron microscopy images in the backscattered electron mode. The porous samples are impregnated with a polymer resin and observed in polished cross sections. Image intensities are calibrated with intensities from pure resin and the bulk phase. The calibration model is justified with Monte Carlo simulations on perfectly homogeneous virtual samples. Uncertainties in measured porosity are given as a function of uncertainties on physical properties of the resin and the bulk phase and on measured signals. The methodology is applied to a series of heterogeneous alumina catalyst supports with varying porosities. A good agreement is found between the averaged local porosity by scanning electron microscopy and global porosity determined by mercury intrusion porosimetry. The use of local porosity statistics allowed the quantitative characterization of the porosity fluctuations of these supports that appeared to be linked with their preparation parameters.

Keywords

backscatteredMonte CarloporositySEM
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 27 , Issue 1 , February 2021 , pp. 20 - 27
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of the Microscopy Society of America

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