What is contact angle?

The contact angle, also known as the droplet angle, is mainly the angle formed between the liquid and a fixed surface, so it is also called the droplet angle. Of course, it doesn't have to be water, other liquids can also be used.

Contact angle refers to the gas at the junction of solid, liquid, and gas phases-Tangents on the liquid interface and solids-The angle between liquid interfaces.

The size of the contact angle can reflect the wetting properties of the liquid on the solid surface. The smaller the contact angle, the better the wetting properties of the liquid on the solid surface, indicating that the liquid tends to spread on the solid surface; On the contrary, the larger the contact angle, the poorer the wettability of the liquid on the solid surface, that is, the liquid tends to move away from the solid surface. The contact angle is an important parameter for measuring the wetting performance of a liquid on the surface of a material. By measuring the contact angle, the surface solid of the material can be obtained-Liquid and solid-Many data selections for gas interface interactions