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<dc:title xml:lang="fr">Layer-by-layer assembly of strong bio-inspired nanocomposites</dc:title>
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<dc:subject xml:lang="fr">Multicouches de polyelectrolytes</dc:subject>
<dc:subject xml:lang="fr">Bio-mimétique</dc:subject>
<dc:subject xml:lang="fr">Matériaux hiérarchiques</dc:subject>
<dc:subject xml:lang="fr">Propriétés mécaniques</dc:subject>
<dc:subject xml:lang="fr">Films ultrafins</dc:subject>
<dc:subject xml:lang="fr">Auto-réparant</dc:subject>
<dc:subject xml:lang="fr">Microfibrilles de cellulose</dc:subject>
<dc:subject xml:lang="fr">Architectures multimateriaux</dc:subject>
<dc:subject xml:lang="en">Polyelectrolyte multilayers</dc:subject>
<dc:subject xml:lang="en">Bio-mimicry</dc:subject>
<dc:subject xml:lang="en">Hierarchical materials</dc:subject>
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<dc:subject xml:lang="en">Ultrathin films</dc:subject>
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<dc:subject xml:lang="en">Microfibrillated cellulose</dc:subject>
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<dcterms:abstract xml:lang="fr">Les performances exceptionnelles des composites naturels comme la nacre ou le bois émergent de l’arrangement précis d’éléments souples et rigides à l’échelle nanométrique. L’assemblage couche-par-couche permet la fabrication de films avec un contrôle nanométrique de l’organisation et de la composition. Ce travail décrit l’assemblage et les propriétés de nouveaux nano-composites contenant des nano-renforts 1-D (fibrilles de cellulose) et 2-D (plaquettes d’argile). Nous avons combiné les argiles avec une matrice extrêmement souple de poly(diméthylsiloxane) dans une architecture lamellaire imitant celle de la nacre. Nous avons étudié des composites à base de fibrilles de cellulose aléatoirement orientées dans le plan, puis alignées dans une direction pour mieux imiter les parois cellulaires du bois. Les propriétés mécaniques de ces composites bio-inspirés égalent ou surpassent celles de leurs homologues naturels, tout en étant transparents et dans certains cas auto-réparants.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Natural materials such as nacre or wood gain their exceptional mechanical performances from the precise organisation of rigid and soft components at the nano-scale. Layer-by-layer assembly allows the preparation of films with a nano-scale control over their organisation and composition. This work describes the assembly and properties of new nano-composites containing 1-D (cellulose nano-fibrils) and 2-D (clay nano-platelets) reinforcing elements. The clay platelets were combined with an extremely soft matrix (poly(dimethylsiloxane)) to mimic the lamellar architecture of nacre. Cellulose based composites with a random in plane orientation of the fibrils were studied first, later we aligned the fibrils in a single direction to mimic further the cell wall of wood. The mechanical properties of these bio-inspired composites match or surpass those of their natural counterparts, while being transparent and in one case self-repairing.</dcterms:abstract>
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