A general orientation distribution function for clay-rich media

Thomas Dabat (), Fabien Hubert (), Erwan Paineau, Pascale Launois, Claude Laforest, Brian Grégoire, Baptiste Dazas, Emmanuel Tertre, Alfred Delville and Eric Ferrage ()
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Thomas Dabat: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers
Fabien Hubert: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers
Erwan Paineau: Laboratoire de Physique des Solides, UMR 8502 CNRS, Université Paris Saclay, bât. 510
Pascale Launois: Laboratoire de Physique des Solides, UMR 8502 CNRS, Université Paris Saclay, bât. 510
Claude Laforest: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers
Brian Grégoire: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers
Baptiste Dazas: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers
Emmanuel Tertre: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers
Alfred Delville: ICMN, UMR 7374 CNRS, Université d’Orléans
Eric Ferrage: IC2MP-Hydrasa, UMR 7285 CNRS, Université de Poitiers

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The role of the preferential orientation of clay platelets on the properties of a wide range of natural and engineered clay-rich media is well established. However, a reference function for describing the orientation of clay platelets in these different materials is still lacking. Here, we conducted a systematic study on a large panel of laboratory-made samples, including different clay types or preparation methods. By analyzing the orientation distribution functions obtained by X-ray scattering, we identified a unique signature for the preferred orientation of clay platelets and determined an associated reference orientation function using the maximum-entropy method. This new orientation distribution function is validated for a large set of engineered clay materials and for representative natural clay-rich rocks. This reference function has many potential applications where consideration of preferred orientation is required, including better long-term prediction of water and solute transfer or improved designs for new generations of innovative materials.

Date: 2019
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DOI: 10.1038/s41467-019-13401-0

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