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Pénétration d'un solvant dans un gel poreux en consolidation : application à la restauration des oeuvres d'art

Abstract : Art painting restoration aims to restore the readability of a painting and to preserve its integrity. Most of the techniques consist of depositing solvents on the surface of the painting to dissolve the varnish layer. However, the sublayers can be damaged by the penetration of the solvent, possibly resulting in swelling or cracking processes. Due to the physical and chemical complexity of the pictorial layer, we propose to study solvent penetration in model nano porous media obtained by controlled drying of aqueous silica nanoparticles dispersions. Drying and the consolidation process of these colloidal dispersions are studied until drying cracks appear. Neutron reflectivity and small angle neutron scattering provide structural information on particles near the interface between the dispersion and the air and in the bulk, respectively, during drying. The experimental study of drying cracks, associated to a poroelastic model, inform on mechanical properties of consolidated model systems and of the painting “Jeanne d'Arc en prison” (1824) by the French painter Louis Crignier (1790-1824). Characterization of the porous media obtained after consolidation is carried out with neutron imaging to determine the permeability and the porosities of the porous media. Finally, we present the dynamics of imbibition of sessile solvent drops on several porous media with different pore sizes. Our experimental set-up provides a precise and a direct quantification of the different flows outside and through the porous media. Mechanical properties are performed before and after solvent imbibition, by micro-indentation testing.
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Submitted on : Friday, March 2, 2018 - 3:17:20 PM
Last modification on : Thursday, July 8, 2021 - 3:49:49 AM

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  • HAL Id : tel-01721770, version 1

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Marguerite Leang. Pénétration d'un solvant dans un gel poreux en consolidation : application à la restauration des oeuvres d'art. Mécanique des structures [physics.class-ph]. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLS469⟩. ⟨tel-01721770⟩

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