Optical droplet angle refers to the angle between the gas-liquid interface and the solid-liquid interface at the intersection of solid, liquid, and gas. It is an important parameter for measuring the wettability of liquids on solid surfaces, suitable for precise measurement of small droplets (volume<1 μ L) or high viscosity liquids. Image contour analysis is used to measure the surface contact angle, wettability, surface energy and other characteristics of the sample. The optical droplet angle measurement equipment has the characteristics of high cost-effectiveness and comprehensive functions, which can meet the needs of conventional sample surface wettability measurement. Previously, the editor has already explained to you the selection, advantages, and precautions related to the contact angle of water droplets. Today, the editor will provide a detailed explanation of the optical water droplet angle, which is different from previous water droplet contact measuring instruments. As is well known, the angle (θ) between the tangent line of the water droplet surface and the solid surface refers to its physical meaning:

1. θ<90 °: After optical droplet angle testing, the surface exhibits hydrophilicity (droplet spreading);

2. θ>90 °: Surface hydrophobicity (water droplets are spherical);

3. θ=0 °: completely wetted (water droplets completely spread into a film).

Let's first understand the application areas of optical water droplet contact angle:

1. Materials Science and Surface Treatment: Used to evaluate the hydrophobicity or hydrophilicity of material surfaces, such as testing the hydrophobicity of glass cover plates, mobile phone glass coatings, and the adhesion of solder flux to metals during metal welding processes. It can also be used to study the influence of cleanliness and roughness of solid surfaces on wettability.

2. Electronics and Semiconductors: In the fields of electronic manufacturing, semiconductors, etc., by measuring the water droplet angle value, the surface energy distribution of materials and the degree of pollutant residue can be accurately evaluated, providing quantitative data for the pre bonding cleanliness analysis of electronic components.

3. Printing and Adhesive: Study the adhesion between ink, metal, and paper, as well as the degree of adhesion between adhesives and solids.

Optical contact angle measuring instruments are widely used in various industries, including mobile phone manufacturing, glass manufacturing, surface treatment, material research, semiconductor manufacturing, coatings and inks, electronic circuits, textile fibers, medical biology, and other fields

Secondly, let's take a closer look at the characteristics that optical water droplets come into contact with:

1. High precision and high resolution: It can provide high-precision contact angle measurement results, with a measurement accuracy of ± 0.1 °, and can measure very small changes in contact angle.

2. Contactless measurement: Measurement is carried out through optical imaging technology, avoiding surface contamination or damage that may be caused by physical contact.

3. Widely applicable: not only suitable for measuring the contact angle between droplets and flat surfaces, but also for measuring the contact angle of irregular surfaces.

4. Easy to operate and strong data processing capabilities: The instrument has a user-friendly interface and is equipped with powerful software for data correction, saving, analysis, image processing, and result export.

Once again, let's delve into the operation and application of optical waterdrop angle instruments

The optical contact angle measuring instrument integrates modern technology, equipped with a high-performance dedicated CMOS digital camera and high-resolution zoom microscope, combined with a high brightness LED background light source, providing excellent visual effects. Its 3D sample stage supports up and down, left and right, and forward and backward movement, meeting different testing needs.

The instrument has micro injection and precision movement functions to ensure the accuracy of testing. The flexible design of the telescopic rod structure worktable can adapt to different material thicknesses and expand the range of use.

Operation guide for droplet method of optical contact angle measuring instrument:

1. Firstly, perform horizontal adjustment, then firmly place the sample on the workbench and press it tightly with spring plates.

2. Fine adjust the droplet volume through a microsampler to form at the needle tip.

3. Subsequently, turn the knob to move the worktable up, so that the surface of the sample comes into contact with the droplet, and then move the worktable down to leave the droplet on the sample,

4. Equipped with 2x fixed magnification high-definition microscopes: providing clear visual effects for easy observation and measurement.

5. Digital CMOS camera: Record the experimental process and achieve video recording/playback function.

6. Instant screenshot and export: convenient for capturing key moments and exporting individual videos at will.

Flexible workbench size and range of movement: Suitable for samples of different sizes, ensuring convenient measurement. After completing these steps, contact angle measurement can be carried out. The measurement method is simple and efficient, and only the three-point method is needed to quickly obtain the angle result.

Optical contact angle measurement has become an important tool for evaluating surface properties. The optical contact angle measuring instrument not only has comprehensive functions, but also is easy to operate, measuring the contact angle of various special materials, such as powders, curved surfaces, superhydrophobic/superhydrophilic samples; Analyzing the adhesion of liquids on solid surfaces to evaluate their uniformity and cleanliness is an ideal choice for measuring contact angles in both scientific research and industrial fields.