COSTE, Raphael; SOLIMAN, Mikhael; BERCU, Nicolas B.; POTIRON, Sylvain; LASRI, Karima; AGUIE-BEGHIN, Veronique; TETARD, Laurene; CHABBERT, Brigitte; MOLINARI, Michael

doi:10.1016/j.compscitech.2020.108485

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Composites Science and Technology. 2021, vol. 201

Résumé en anglais

As pressing needs for exploring molecular interactions in plants soar, conventional sample preparation methods come into question. Though resins used to embed plant tissues have long been assumed to bear no palpable effect on their properties, discrepancies in recent studies exploiting nanoscale microscopy suggest that their impact could be significant at small scales. By juxtaposing the traits of poplar sections prepared with and without embedding, we evaluate the diffusion (penetration depth) of acrylic and epoxy resins commonly used for embedding. Our results unveil critical quantitative differences when probing mechanical properties with a microscale nanoindentation indenter or a nanoscale tip. The latter resolves significant stiffness variations between the compound middle lamellae, the secondary cell wall layers S1 and S2, and the cell corner, not accessible with nanoindentation. Similar observations are drawn from comparing confocal Raman and nanoscale infrared spectroscopy. Our findings shed light on the effect of resin diffusion suggesting acrylic LR White to be the least diffusive for plant cell wall studies.< Réduire

Mots clés en anglais

Natural fibres (A)

Mechanical properties (B)

Atomic force microscopy (D)

Infrared (IR) spectroscopy (D)

Raman spectroscopy (D)

Project ANR

Etude du comportement hygroscopique du bois et systèmes polymériques inspirés du bois par modélisation numérique et caractérisations avancées - ANR-18-CE93-0007

Unités de recherche

CBMN : Chimie & de Biologie des Membranes & des Nano-objets - UMR 5248