Experimental study on the influence of an electrical field on the shape of sessile droplets


Abstract : When applying an electric field on a droplet deposited on a conducting substrate, it has been found in literature that the shape of the drop becomes deformed. Increasing the potential of this field even further, the droplet ultimately reaches a cone-like shape (the Taylor cone) and a spray of small droplets can even be generated (an electro-spray, used for instance to deliver aerosols). Although this is a rather old problem (+- 1960), some questions still remain on the precise influence of the field on the shape and contact angle of the drop. On the other hand, when placed between two plates, the droplet will exert a force to reach its new equilibrium shape when applying a voltage. The goal of the present thesis then is twofold. First, we would measure a full 3D shape of the droplet with digital interferometry as a function of the strength of the electric field in order to quantify the change in contact angle. The second goal is to measure the force in a wedge geometry precisely and examine its potential to use this configuration as a micro-actuator (collaboration with the BEAMS Department: Prof. Pierre Lambert).
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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