Crack Patterns in Drying Colloidal Films : Application to Art Paintings Study
Lundi 10 avril 2017 14:00
- Duree : 1 heure
Lieu : Conference room - LIPhy - Bât E - 140 Avenue de la Physique - St Martin d’Hères. Accès par interphone, appeler le secrétariat
Orateur : Ludovic PAUCHARD (Laboratoire FAST, Orsay)
Most coatings are made by depositing a volatile liquid that contains dispersed colloidal particles or dissolved macromolecules.
The liquid is then evaporated until a dry film is obtained. When the wet film dries, non-uniform shrinkage occurs ; this generates tensile stresses that can eventually lead to mechanical instabilities. In particular cracks can form leading to a large variety of morphologies.
Such structures affect the quality of the final product ; however the presence of cracks can be of great interest in the domain of conservation/restoration of paintings.
Indeed, the crack patterns can reveal the mechanical properties of the pictorial matter that exhibit a complex system, both from a geometrical and a physicochemical point of views.
These processes will be presented, and highlighted studying a model system.
Contact : thomas.podgorski@univ-grenoble-alpes.fr
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