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<dc:title xml:lang="en">Toward nanofiltration membranes with layer-by-layer assembled and nano-reinforced separation layers</dc:title>
<dcterms:alternative xml:lang="fr">Vers des membranes de nanofiltration avec des couches de separation nano-renforcées et assemblées couche-par-couche</dcterms:alternative>
<dc:subject xml:lang="fr">Membranes de nanofiltration</dc:subject>
<dc:subject xml:lang="fr">Assemblage couche-par-couche</dc:subject>
<dc:subject xml:lang="fr">Couche de séparation polymère</dc:subject>
<dc:subject xml:lang="fr">Couche de diffusion latérale en fibrilles</dc:subject>
<dc:subject xml:lang="fr">Nanofibrils de cellulose</dc:subject>
<dc:subject xml:lang="fr">Nanotubes de carbone</dc:subject>
<dc:subject xml:lang="en">Nanofiltration membranes</dc:subject>
<dc:subject xml:lang="en">Layer-by-layer assembly</dc:subject>
<dc:subject xml:lang="en">Polymeric separation layer</dc:subject>
<dc:subject xml:lang="en">Fibrillar lateral diffusion layer</dc:subject>
<dc:subject xml:lang="en">Cellulose nanofibrils</dc:subject>
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<tef:elementdEntree autoriteExterne="029632986" autoriteSource="Sudoc">Couches de Langmuir-Blodgett</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse a été consacré à l'élaboration d'un nouveau type de membranes de nanofiltration efficaces avec des propriétés améliorées (flux élevé et rétention élevée, et de bonnes propriétés mécaniques) en déposant un revêtement assemblé couche-par-couche (LbL) sur des supports poreux. Après avoir systématiquement étudié le mécanisme de croissance des films assemblés couche par couche des polyélectrolytes choisis et la relation entre les structures de ces films et les performances des membranes résultant, nous avons identifié avec succès les meilleures structures multicouches pour la construction de membranes de nanofiltration de référence avec des performances optimales. En outre, en prenant avantage de la technique LbL, nous avons introduit une couche de diffusion latérale assemblée soit de nanofibrilles de cellulose ou de nanotubes de carbone, qui permet d’augmenter le flux de 30% tout en conservant la même rétention par rapport à la membrane de référence. En plus, les films assemblés à base de chitosan et nanofibrils de cellulose ont montré une forte résistance à la traction allant jusqu’à 450 MPa et un module d’Young jusqu’à 50 GPa.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis work was devoted to the development of a novel and efficient nanofiltration membrane with improved properties (high flux and high retention, good mechanical strength) by coating Layer-by-Layer (LbL) assembled films onto porous membrane support. After having systematically studied the growth mechanism of LbL-assembled films of chosen polyelectrolytes and the relationship between the structures of these films and the membrane performance of the resulting NF membranes, we successfully identified the best multilayer structures for constructing nanofiltration membranes (NF) of reference with optimal membrane performance. Furthermore, taking advantages of the LbL-assembly, we successfully introduced LbL-assembled lateral diffusion layer that is made of either cellulose nanofibrils or carbon nanotubes, which in turn led to membranes with 30% higher flux. In addition, the LbL-assembled films of chitosan and cellulose nanofibrils showed surprisingly strong tensile strength of up to 450 MPa and a high Young modulus of up to 50 GPa.</dcterms:abstract>
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