Dewetting on porous media
Laboratoire Physico-Chimie Curie, Unité Mixte de Recherche 168
Centre National de la Recherche Scientifique/Institut Curie
26 rue d'Ulm, 75248 Paris CEDEX 05, France
Accepted: 10 August 2001
Removal of a liquid on porous substrates involves two mechanisms: suction and dewetting. 1) We study first the dewetting with no suction of a liquid film deposited on a porous membrane. We report the first observation of a finite receding angle on a saturated porous surface. Below a critical receding thickness , the film dewets by nucleation and growth of a dry patch. 2) To allow for both mechanisms, we study the aspiration of a hole in the liquid film pumped with a constant current J. Two growth regimes are observed and interpreted: i) a "suction" regime at high J and ii) a dewetting regime at low J.
PACS: 68.08.Bc – Wetting / 47.55.Mh – Flows through porous media
© EDP Sciences, 2001