Principle overview
The so-called contact angle refers to a drop of liquid on a solid horizontal plane, at the solid-liquid-gas three-phase junction point on the solid surface, the gas-liquid interface and the solid-liquid interface two tangents sandwich the liquid phase The angle formed.
The contact angle measuring instrument is mainly used to measure the contact angle of liquid to solid, that is, the wettability of liquid to solid. The instrument can measure the contact angle of various liquids to various materials. The instrument plays a very important role in the research and production of petroleum, printing and dyeing, medicine, spraying, mineral processing and other industries.
When the droplet is freely in a space that is not affected by the force field, it is spherical due to the presence of interfacial tension. However, when a droplet is in contact with a solid plane, its final shape depends on the cohesive force inside the droplet and the relative magnitude of the adhesion between the droplet and the solid. When a droplet is placed on a solid plane, the droplet can be automatically spread over the solid surface or present at a certain angle of contact with the solid surface.
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