Surface force oleophobicity

Two different liquids may compete with each other, if each of them individually wets a solid surface. In this case the resulting contact angle corresponds to that of a better wetting liquid with nature similar to that of the solid surface. If the surface is better wetted by water than by a hydrocarbon ( 0<9O°), it is referred to as hydrophilic (oleophobic) in the case when the surface is better wetted by non-polar hydrocarbon (0>9O°), it is referred to as hydrophobic (oleophilic). For selective wetting, as opposed to wetting in air, the contact angle, 0, can assume any value between 0° and 180°. When 0 = 0°, the more polar liquid spreads over the solid surface, forcing the less polar liquid away when 0 = 180° the situation is opposite the non-polar liquid phase completely forces the polar liquid away from the solid surface. 

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