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Two-step diffusion in cellular hygroscopic (vascular plant-like) materials

Abstract : Vascular plants, a vast group including conifers, flowering plants, etc., are made of a cellular hygroscopic structure containing water in the form of either free (i.e., in a standard liquid state) or bound (i.e., absorbed in the cell walls) water. From nuclear magnetic resonance techniques, we distinguish the dynamics of bound water and free water in a typical material (softwood) with such a structure, under convective drying. We show that water extraction relies on two mechanisms of diffusion in two contiguous regions of the sample, in which respectively the material still contains free water or only contains bound water. However, in any case, the transport is ensured by bound water. This makes it possible to prolong free water storage despite dry external conditions and shows that it is possible to extract free water in depth (or from large heights) without continuity of the free water network.
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Soumis le : samedi 25 juin 2022 - 22:01:38
Dernière modification le : dimanche 26 juin 2022 - 10:06:10

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Marion Cocusse, Matteo Rosales, Benjamin Maillet, Rahima Sidi-Boulenouar, Elisa Julien, et al.. Two-step diffusion in cellular hygroscopic (vascular plant-like) materials. Science Advances , American Association for the Advancement of Science (AAAS), 2022, 8 (19), ⟨10.1126/sciadv.abm7830⟩. ⟨hal-03704758⟩



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