Why is contact angle important? Nowadays, there are optical contact angle and water droplet contact angle measuring instruments on the market. What is the difference between them?

As is well known, contact angle can better detect the adhesion, coating, and cleaning effects of product surfaces. So, what are the biggest differences between optical contact angle and water droplet contact angle?

Firstly, please follow in the footsteps of the editor and learn about the water droplet contact angle. What are the advantages of this device!

The water droplet contact angle measuring instrument is dedicated to contact angle measurement and droplet shape analysis. It has mechanical precision in all three directions, equipped with a 6.5x zoom lens, manual focusing, and adjustable observation angle. It is also equipped with an independent direct measurement system.

1. The contact angle of water droplets mainly focuses on measuring the contact angle formed by water droplets on solid surfaces, and is commonly used to evaluate the surface wettability and cleanliness of materials. In the electronic manufacturing industry, it can be used to evaluate the surface cleanliness and wettability of electronic components, circuit boards, touch screens, and other products.

2. The contact angle of water droplets is mainly divided into two types: static and dynamic. It can automatically select and locate the needle, measure surface and interfacial tension, calculate the surface free energy of solids and liquids, such as the surface free energy of solids and the surface and interfacial tension of liquids, to determine the contact angle between droplets and solids. Due to its fast and simple execution, this measurement method is widely used in various industries and research fields, such as packaging printing, glass, automotive, and biomedicine.

The contact angle of a water droplet is a measurement method for quantifying the degree of wetting of a solid by a liquid. From a geometric perspective, it is defined as the angle formed by the liquid at the triple junction point (where the liquid, gas, and solid meet), such as interfacial tension, (surface tension of the liquid), (solid-liquid interfacial tension), and (surface tension of the solid, i.e. surface free energy), forming the equilibrium contact angle of wetting. What is wettability? Wettability refers to the tendency of a liquid to spread on a surface of interest, typically characterized by static contact angle measurements using water as a probe liquid. Generally speaking, when a liquid tends to spread and form a flatter droplet, the surface is described as having good or high wettability. When the liquid tends to 'aggregate', the surface is described as having poor or low wettability. In practice, these wettability categories are related to specific contact angle measurement ranges,

Measurement of water contact angle can be used to determine the hydrophilicity or hydrophobicity of a surface, which is often crucial for evaluating the success or failure of surface treatment or cleaning processes. If water droplets spread on the surface, resulting in a contact angle less than 90 °, then the surface is considered hydrophilic. On the contrary, if the water droplets do not have a spreading trend, resulting in a contact angle greater than 90, then the surface is considered hydrophobic.

The above is the relevant information about the contact angle of water droplets. You can follow the product information of Zhenyi Co., Ltd. to learn more. In the next issue, the editor will share with you the different optical water droplet angle measuring instruments. You can follow us to your heart's content!