denotes the ability of liquids to spread on a surface; the better the wettability the lower is the contact angle; surfaces are called (incompletely) wettable in case of an occurring contact angle 90
Author: I.C. Topala The surface property used to describe the degree a liquid (e.g. water) will spread onto the surface. Usually for an accurate description, this property is discussed in terms of contact angle of liquids on a solid surface.
Wettability means a solid body's property to accept a second material, e.g. a coating. By definition, wetting is a process where a solid body's surface that used to abut on a gas phase gets in touch with a liquid. In order to determine the wettability, a measurement of the contact angle can be executed which makes it possible to determine the surface tension. If there is an objectionable wetting problem, the wettability can be improved by means of a suitable plasma treatment under atmosphere or in vacuo in order to enable e.g. gluing, printing, and varnishing.
The relative degree to which a fluid will spread into or coat a solid surface in the presence of other immiscible fluids.
The preference of a solid to contact one liquid or gas, known as the wetting phase, rather than another. The wetting phase will tend to spread on the solid surface and a porous solid will tend to imbibe the wetting phase, in both cases displacing the nonwetting phase. Rocks can be water-wet, oil-wet or intermediate-wet. The intermediate state between water-wet and oil-wet can be caused by a mixed-wet system, in which some surfaces or grains are water-wet and others are oil-wet, or a neutral-wet system, in which the surfaces are not strongly wet by either water or oil. Both water and oil wet most materials in preference to gas, but gas can wet sulphur, graphite and coal.