Drop impact on soft surfaces: beyond the static contact angles.
The wettability of cross-linked poly(dimethylsiloxane) elastomer films and of octadecyltrichlorosilane self-assembled monolayers with water has been measured and compared using various methods. Contact angle hysteresis values were compared with values reported in the literature. A new method to characterize advancing, receding contact angles, and hysteresis using drop impact have been tested and compared with usual methods. It has been found that for the rigid surfaces the drop impact method is comparable with other methods but that for elastomer surfaces the hysteresis is function of the drop impact velocity which influences the extent of the deformation of the soft surface at the triple line.
Rioboo
Romain
R
Laboratoire de Physique des Surfaces et des Interfaces, Université de Mons, Place du Parc, 20, 7000 Mons, Belgium. romain.rioboo@umons.ac.be
Voué
Michel
M
Adão
Helena
H
Conti
Joséphine
J
Vaillant
Alexandre
A
Seveno
David
D
De Coninck
Joël
J