Sliding behavior of liquid droplets on tilted Langmuir-Blodgett surfaces.
The sliding behavior of liquid droplets on inclined Langmuir-Blodgett surfaces was investigated. The critical sliding angle defined as the tilt angle of the surface at which the drop slides down as well as the advancing and receding contact angles was measured for five different liquids on five surfaces. In addition, the contact line geometry was analyzed at critical sliding angle. The experimental relationship between the surface tension forces resulting from contact angle hysteresis and the weight of the drop was compared to theoretical predictions. Even though the shape of the drop bases was found as skewed ellipses, a model assuming parallel-sided elongated drops is shown to describe reasonably the experimental values. This result probably indicates the main influence of the capillary forces at the rear and front edges of the drop with respect to that exerted on the lateral sides.
Bouteau
Murielle
M
Laboratoire de Physico-Chimie des Polymères et des Interfaces (LPPI, EA 2528), Université de Cergy-Pontoise, Neuville sur Oise, 95 031 Cergy-Pontoise Cedex, France.
Cantin
Sophie
S
Benhabib
Fewzi
F
Perrot
Françoise
F