A contact angle measuring instrument is an instrument commonly used to measure the wettability of a liquid on a solid surface. In powder processing, coatings, pharmaceuticals and other industries, understanding the wettability of powders is of great significance for product performance and quality control. This article will show how to test the wettability of powders using a contact angle measuring instrument.
1. Preparation before the test.
1.Selected powder samples.
Before conducting the test, it is necessary to select the appropriate powder sample according to the test needs. Generally speaking, the particle size, shape, composition, etc. of a powder sample will affect its wettability. Therefore, these factors need to be taken into account when selecting powder samples and try to ensure that the selected samples are representative.
2.Prepare the contact angle gauge.
The contact angle measuring instrument is mainly composed of a light source, a beam gathering system, a sample stage, a detector and other parts. Before performing the test, the instrument needs to be calibrated to ensure the accuracy of the measurement results. At the same time, the sample stage needs to be cleaned and the powder sample placed on the sample stage.
3.Select the test liquid.
When performing the test, it is necessary to select the appropriate test fluid. The choice of test fluid should be determined according to the actual application scenario, such as water, ethanol, acetone, etc. When selecting a test liquid, consideration needs to be given to its wettability and effect on the powder sample.
Second, the test process.
1.Adjust the light source and beam gathering system.
Adjust the light source and beam gathering system to the appropriate position to facilitate the observation of the surface topography of the powder sample. During the adjustment process, care needs to be taken to avoid the influence of the light source and the beam gathering system on the measurement results.
2.Adjust the detector.
The detector is adjusted to the appropriate position to facilitate the collection of data on the surface topography of the powder sample. During the adjustment process, care needs to be taken to avoid the influence of the detector on the measurement results.
3.Take measurements.
Once the preparation is complete, the measurement can be taken. The test liquid was added dropwise to the surface of the powder sample, and then the surface topography of the powder sample was observed. At the same time, it is necessary to record the amount of dropping and wetting time of the test liquid. During the measurement process, it is necessary to pay attention to the surface topography changes of the powder sample, and adjust the measurement conditions in time to ensure the accuracy of the measurement results.
4.Data processing and analysis.
After the measurement is completed, the acquired data needs to be processed and analyzed. In general, a contact angle measuring instrument can calculate parameters such as the wetting angle and wetting diameter of the surface of a powder sample. Through the analysis of these parameters, the wettability of powder samples can be understood, which can provide a basis for product performance and quality control.
III. Conclusion. The contact angle gauge is an effective instrument for measuring the wettability of powders. By using a contact angle measuring instrument for testing, the wettability of powder samples can be understood, which can provide a basis for product performance and quality control. When conducting the test, it is necessary to pay attention to the calibration of the instrument, the selection of the test liquid, and the adjustment of the measurement conditions to ensure the accuracy of the measurement results.