Résumé : 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.
Lieu : LIPhy, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères