Organogels et aérogels obtenus à partir de phénylalanine : étude de l'organisation supramoléculaire et élaboration d'un nouveau type de super-isolant thermique

Abstract : Since 1973, France's main objective in this domain has been to reduce the consumption of energy in heating residential and industrial buildings, which represents more than 40% of the national consumption. Consequently, the development of heat insulators has been the subject of research which has resulted in new materials: super thermal insulators with a thermal conductivity of less than 25 mW.m-1.K-1. Organic aerogels with a low density of Z-Phe-NH-Napht have been studied at LCPM for the past 10 years. Despite their very weak mechanical resistance they present a fibrillar structure which gives them very interesting thermal properties. A fundamental study of the supermolecular self-assembly allowed us to demonstrate the existence of two stacking methods of gelling molecules: head-to-head (monocrystals) and head-to-tail (gels) which are characterized by a specific infrared signature to the pseudo-cycles respectively on C12 and C10/C14. In addition, we also studied the sequential formation mechanism of these gels which resulted in a full model of their molecular organization from the single molecule to the fiber and based on a hexagonal packing symmetry. In aim of commercializing an insulator made from organic aerogels, we firstly optimized the protocol for obtaining aerogels to then work on improving their thermal and mechanical properties. We created a new hydrophobic insulator which has both a thermal conductivity in the range of the super heat insulators' and good mechanical properties that are compatible with industrial prerequisites for the construction of buildings
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Submitted on : Thursday, March 29, 2018 - 1:15:19 PM
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  • HAL Id : tel-01751296, version 1

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Sébastien Son. Organogels et aérogels obtenus à partir de phénylalanine : étude de l'organisation supramoléculaire et élaboration d'un nouveau type de super-isolant thermique. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0004⟩. ⟨tel-01751296⟩

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