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     <dc:title xml:lang="fr">Compréhension de la formulation d’une solution pulvérulente (liquid marbles) et optimisation en vue d’applications industrielles en cosmétique</dc:title>
     <dcterms:alternative xml:lang="en">Understanding the formulation of a powdered solution and optimization for industrial        applications in cosmetics</dcterms:alternative>
     <dc:subject xml:lang="fr">Cosmétique</dc:subject><dc:subject xml:lang="fr">poudres minérales</dc:subject><dc:subject xml:lang="fr">formulation</dc:subject><dc:subject xml:lang="fr">hydrophobicité</dc:subject><dc:subject xml:lang="fr">Billes liquides</dc:subject><dc:subject xml:lang="fr">liquides secs</dc:subject>
     <dc:subject xml:lang="en">Cosmetics</dc:subject><dc:subject xml:lang="en">mineral powders</dc:subject><dc:subject xml:lang="en">formulation</dc:subject><dc:subject xml:lang="en">hydrophobicity</dc:subject><dc:subject xml:lang="en">liquid marbles</dc:subject><dc:subject xml:lang="en">dry liquids</dc:subject>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="02765222X">Produits cosmétiques</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Cette thèse CIFRE vise à lever les verrous techniques liés à la production à grande échelle d’un produit cosmétique innovant : la poudre évolutive. Ce matériau hybride, composé d’une poudre minérale hydrophobe enrichie en phase liquide, se transforme en soin hydratant crémeux lors de son application sur la peau. L’originalité de ce travail réside à la fois sur le caractère inédit du produit et sur l’approche pluridisciplinaire et multi-échelle mise en place. L’étude combine l’analyse de poudres minérales (imagerie MEB, rhéologie des poudres) et l’analyse d’un système modèle simplifié, les liquid marbles, via des outils de tensiométrie, d’imagerie à haute vitesse et de rhéologie interfaciale. Le produit final, élaboré aussi bien à l’échelle laboratoire qu’à l’échelle semi-industrielle, a été caractérisé par des mesures rhéologiques avancées (SAOS et LOAS). Les résultats montrent l’influence majeure du traitement hydrophobe sur les propriétés d’écoulement et l’organisation interfaciale des poudres. Les essais de production à petite échelle ont permis d’optimiser la formulation tandis que la montée en échelle a conduit à l’identification et à l’ajustement des paramètres critiques du procédé. Ce travail a ainsi apporté à l’entreprise des solutions concrètes pour le développement et la pérennisation du procédé de fabrication de la poudre évolutive à l’échelle semi-industrielle, tout en ouvrant de nouvelles perspectives scientifiques sur les systèmes complexes poudre/liquide.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">This CIFRE thesis aims to overcome the technical barriers associated with the large-scale production of an innovative cosmetic product: the evolutive powder. This hybrid material, composed of a hydrophobic mineral powder enriched with a liquid phase, transforms into a moisturizing treatment when applied to the skin. The originality of this work lies in the novelty of the product and in the multidisciplinary and the multi-scale approach used. The study combines the analysis of mineral powders (SEM imaging, powder rheology) and the analysis of a simplified model system, liquid marbles, using tensiometry, high-speed imaging, and interfacial rheology tools. The final product, developed on both a laboratory and semi-industrial scale, was characterized using advanced rheological measurements (SAOS and LOAS). The results show the major influence of hydrophobic treatment on the flow properties and on interfacial organization of the powders. Small-scale production trials enabled the formulation to be optimized, while upscaling led to the identification and adjustment of critical process parameters. This work has thus provided the company with concrete solutions for the development and sustainability of the manufacturing process for the evolutive powder on a semi-industrial scale, while opening up new scientific perspectives on complex powder/liquid systems. </dcterms:abstract>
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       <tef:nom>Chonchon</tef:nom>
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