Paint surfaces are porous and not perfect; containing microscopic
peaks and valleys. These irregularities are otherwise known as capillary
structure that either contains or will draw contaminants such as fine
dirt and minerals. A nominally uniform coating will help to lessen the
coefficient of kinetic friction by filling up the fissures with micro
particles to produce a smoother surface.
The potential of
hydrophobicity depends on several factors: relative humidity and
temperature, static electricity, material homogeneity, and surface
smoothness. The smoother the surface, the more hydrophobic it becomes.
To contrast a hydrophilic surface with higher spreading rate which
absorbs moisture, hydrophobic ones repels them. This effect is called
the Lotus Effect.
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