there has been an increased commercial interest
in producing water repellent surfaces. Several materials such
as, nonwovens, textiles, polymer films, and paper products are
hydrophilic. This interaction with water could lead to the reduction
of the mechanical properties of the product or loss of its
functionality. However, water repellency can be imparted to these
products, leading to the protection of their mechanical properties
and adding a new functionality. Surfaces with a static
contact angle higher than 150◦ and low contact angle hysteresis
are defined as super hydrophobic surfaces. Some examples of
hydrophobicity in nature are the lotus leaves and roses petals.
These materials have a hierarchical structure which imparts roughness
to the surface. The combination of roughness and surface
chemical composition give them the superhydrophobic property