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For water, a wettable surface may also be termed hydrophilic and a nonwettable surface hydrophobic.
Superhydrophobic surfaces have contact angles greater than 150°, showing almost no contact between the liquid drop and the surface.
Wetting is the ability of a liquid to maintain contact with a solid surface, resulting from intermolecular interactions when the two are brought together.
The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces.
For nonwater liquids, the term lyophilic is used for low contact angle conditions and lyophobic is used when higher contact angles result.
Similarly, the terms omniphobic and omniphilic apply to both polar and apolar liquids.
A contact angle less than 90° (low contact angle) usually indicates that wetting of the surface is very favorable, and the fluid will spread over a large area of the surface.
There are two types of wetting: non-reactive wetting and active wetting.Wetting deals with the three phases of materials: gas, liquid, and solid.It is now a center of attention in nanotechnology and nanoscience studies due to the advent of many nanomaterials in the past two decades (e.g.Our girls are always desperate to go to the toilet, but love to pee in their pants instead!Some of our girls even love pooping their panties and wearing dirty diapers!
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