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Formulation et propriétés physico-chimiques de peintures a tempera à base de jaune d’œuf et de terres vertes

Abstract : Tempera painting is a pictorial technique that was widely used during the Middle Age. Based on historical recipes of the 15th century, formulations with egg yolk and green earth have been reproduced in order to characterize the physicochemical properties of this paint from the mesoscopic scale to the macroscopic scale. The pigment, green earth, is composed of celadonite or glauconite, that are phyllosilicates of the mica family. A multi-technique protocol has been developed to identify these minerals in commercial pigments and in-situ in artworks. The influence of grinding on the pigment and then on the properties of the paint have been studied. The study of water dynamics by 1H NMR relaxometry of aqueous suspensions at different concentrations of pigment has been correlated to rheological properties. A unique population of 1H follows the same dynamics at the interface of the minerals regardless of their concentration. This confirms the homogeneity of the mixture. Macroscopically, the aqueous suspensions present visco-elastic properties and under flow, they are shear thinning. The egg yolk is also shear thinning whereas its relaxometry profile reveals an average population of 1H with similar dynamics to gels.The study of tempera paint by 1H NMR relaxometry highlights the structure of the network formed by the yolk compounds and the pigment. The rheological measurements attest to the importance of the binder on the visco-elastic properties of paints.
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Submitted on : Friday, November 20, 2020 - 10:53:45 AM
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  • HAL Id : tel-03016025, version 1

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Agathe Fanost. Formulation et propriétés physico-chimiques de peintures a tempera à base de jaune d’œuf et de terres vertes. Chimie inorganique. Sorbonne Université, 2019. Français. ⟨NNT : 2019SORUS100⟩. ⟨tel-03016025⟩

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