Article Dans Une Revue Nature Communications Année : 2019

A general orientation distribution function for clay-rich media

Une fonction de distribution orientationnelle générique pour les milieux riches en argile

Résumé

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.

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hal-02404547 , version 1 (06-11-2020)

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Thomas Dabat, Fabien Hubert, Erwan Paineau, Pascale Launois, Claude Laforest, et al.. A general orientation distribution function for clay-rich media. Nature Communications, 2019, 10 (1), ⟨10.1038/s41467-019-13401-0⟩. ⟨hal-02404547⟩
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