Wetting and dewetting of complex substrates driven by body forces
Employ a centrifugal technique capable of imparting well-controlled simultaneous tangential and normal body forces to study the dynamics of liquids spreading onto complex solid substrates. Hereby a combination of tangential and normal forces will be employed.
Originality and innovative aspects: In many applications liquids in contact with solid surfaces are exposed to body forces of different orientation. It is believed that the ability of freely controlling the direction and the magnitude of the body force acting to the liquid helps to acquire better understanding of the spreading dynamics. A novel centrifugal technique was proposed to gauge the attachment/detachment tangential forces holding a droplet onto the substrate. This technique will be modified to include normal forces. This innovative type of experiments will expand the basis of knowledge on the spreading of liquids on morphologically complex (including porous) substrates.
Methodologies: Experimental investigations will be performed using a centrifugal setup, in which body forces will be exercised on droplet through the fast rotation of a tilted solid substrate with a droplet on it. The spreading will be measured with optical methods.
 A.M. Goula, T. Karapantsios, K.G. Adamopoulos, Drying Technology 25, 559-607 (2007).
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