ABSTRACT
The phenomena of wetting and adhesion between a liquid and a solid phase are very important because of their technological importance. Wetting is characterized by the contact angle formed when a liquid drop rests on a smooth, homogeneous, non-deformable and inert surface of a solid. Considering the equilibrium of various interfacial forces acting on the sessile drop, the contact angle, 0, is given by Young's equation as
(1) where, ysl, ysv and ylv are solid-liquid, solid-vapor and liquid-vapor interfacial energies. The wetting characteristic of a solid surface can be controlled by altering the surface energy [1-5] of the solid.
