Wetting dynamics on textured surfaces


Abstract : When a droplet is deposited on a surface, it can adopt various geometries depending on the physico-chemical properties of the surface, i.e. its surface energy and roughness. Whereas a droplet of water can wet a smooth substrate with a hydrophilic behaviour, it can acquire a non-wetting shape when this surface is textured. Recent studies have shown that it is now possible to control the surface properties in order to produce completely wetting or non-wetting surfaces. However, the interaction of droplets on such complex textured surfaces is still poorly understood. Therefore, we propose to conduct a study to improve the understanding of the phenomenon of wetting of structured surfaces. More especially, we will focus on the dynamics of contact line on these complex surfaces (with or without evaporation, in spreading or in recession). This will be studied using interferometric measurements in which the candidate will be trained. Chemically and/or geometrically structured surfaces, with regular and/or disordered patterns will be provided by partner universities (KULeuven and UMons), in the framework of the IAP – MicroMAST (Multiscale Applications of Surface Tension: Microfluidics and Micromanipulation) Project. This experimental investigation can be extended to numerical or theoretical approaches according to the wish of the candidate.
Promoteur/Supervisor : Prof. Colinet Pierre
Email : pcolinet@ulb.ac.be
Site Web/Web site : http://www.tips-ulb.be/
Centre de recherche/Research center : TIPs (Transfers, Interfaces and Processes)
Faculté/Faculty : Faculté des Sciences appliquées - école polytechnique/Brussels School of Engineering (Faculty of Applied Sciences)
Ecole doctorale/Graduate Colleges : Sciences de l'ingénieur/Engineering
Ecole doctorale thématique/Graduate School (French Only):



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