The contact angle refers to the angle between a liquid drop on a solid horizontal plane and the solid-liquid-gas three-phase junction point on the solid surface, when the two tangent lines of the gas-liquid interface and the solid-liquid interface sandwich the liquid phase. into the corner. When the droplet is free in the space not affected by the force field, it is spherical due to the existence of interfacial tension. However, when a droplet comes into contact with a solid surface, its final shape depends on the relative strength of the cohesive forces inside the droplet and the adhesion between the droplet and the solid. When a droplet is placed on a solid surface, the droplet can spread out on the solid surface automatically, or exist as a droplet with a certain distance from the solid surface.
The contact angle Tester is a standard instrument for measuring solid contact angle, surface energy, etc. and liquid surface tension. It is mainly used to measure the contact angle of liquid to solid, that is, the wettability of liquid to solid, and can also measure is the contact angle of the liquid. Using professional optical video measurement technology, the images captured by high-precision industrial cameras are sent to the computer for data processing. It has complete functions and is very convenient to operate. The contact angle Tester is widely used in surface research and cleanliness analysis of glass, lens, LCD screen, CD components, touch screen, circuit board, petroleum, spraying and other industries.
The contact angle Tester is an analytical test instrument for testing liquid-solid (or liquid-liquid-solid) contact angle value and liquid-gas (or liquid-liquid) surface tension/interfacial tension.
Therefore, the indicators that need to be evaluated by the contact angle Tester include two items: contact angle value and surface tension value. The measurement categories involved in these two index items are: category 8 - geometric measurement: also known as length measurement, which is the measurement of the geometric size, position and angle of an object; and category 10 - chemical measurement: also known as Physical stoichiometry refers to the analysis and measurement of the composition, physical properties and basic physical constants of various substances.
