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Theses

Le rôle des matériaux hybrides à base d'argiles dans la protection des œuvres d'art

Abstract : The work of this thesis focuses on the stabilization of several hybrid pigments.The first part deals with pigment obtained with carminic acid and montmorillonite, a common clay. A method of reversing the surface charge of the clay with a cationic polymer, or the use of clays modified with titanium and aluminum polycations, allows the elaboration of the pigment. The resistance of the pigments to photodegradation is then tested. Coupled NMR, DRX, FTIR and EPR techniques help to illuminate the arrangement of organic molecules on the mineral surface, and also to follow the dye degradation process.The description of hybrid pigments obtained using a spiropyran completes the study. The compound, which plays the role of organic dye, is added to different mineral matrices: clay, modified or not, and co-precipitation with organosilanes. These syntheses make it possible to observe the variety of color obtained by mixing the same dye with several matrices of different nature.
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David Guillermin. Le rôle des matériaux hybrides à base d'argiles dans la protection des œuvres d'art. Chimie inorganique. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS288⟩. ⟨tel-02373038⟩

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