JINHE JY-PHc contact angle tester automatic analysis of contact angle/surface tension, automatic sampling

The JY-PHc contact angle meter is used to measure the contact angle between the three phases of solid, liquid and gas. By measuring the contact angle, the adhesion of the liquid to the solid, the surface tension of the solid and the surface energy of the surface are calculated and measured. The instrument is widely used in the fields of petroleum, chemical, papermaking, dyes and various new materials research and manufacturing. Computer technology is used to transfer the ingested images into the computer for storage, analysis and printing. Fast speed, accurate data, and easy operation. The equipment has the functions of automatic sample injection, automatic surface tension analysis, and automatic contact angle analysis, with a high degree of automation and high measurement accuracy.

Key features:

1. Automatic contact angle analysis

Using machine vision technology, the baseline and droplet contours are automatically identified, and the quadratic curve fitting calculation is carried out based on the Laplace equation to obtain the contact angle value. The effect of gravity on the shape of the droplet is reduced, and the human test error is eliminated. Fully automatic testing can be achieved for images with obvious baseline features, and the baseline position needs to be manually specified for images with obvious baseline features.

2. Automatic surface tension analysis

The standard method of hanging droplet test in "SY-T 5370 Surface and Interfacial Tension Determination Method" is used to automatically identify the droplet profile and perform automatic surface tension calculation.

3. Automatic injection

The JY_PHc model adopts an automatic microsampler, which can be equipped with multiple microsamplers to change liquids at any time; It is suitable for scenarios where different liquids are frequently used to characterize solid surfaces or to frequently test the surface tension of different liquids. The injection accuracy is high, and the microsampler is easy to replace.

Test methodology

1. Static drip method

Drop a drop of liquid on the solid surface, take a picture of the equilibrium system after the solid-liquid-gas three-phase interface is balanced, and measure the contact angle through the contact angle measurement method provided by the software. The balancing process can also be photographed or videotaped regularly during the test, and then the system change process can be analyzed.

2. Increase and decrease droplet method

Due to the existence of inhomogeneity on the solid surface, it is sometimes necessary to measure the dynamic contact angle to analyze the hysteresis phenomenon of the contact angle, and this instrument can measure the forward angle by continuously increasing the droplet volume or continuously decreasing the droplet volume to measure the backward angle.

Contact angle analysis method

• Automatic analysis method: For most pictures, one-click result analysis can be realized, using computer vision analysis technology, quadratic curve fitting method, automatic measurement and calculation of results. For a small number of images with inconspicuous baseline characteristics, the baseline method is manually specified and automatically measured. The display accuracy is 0.1°. This method basically overcomes the influence of gravity on the shape of droplets, improves the test accuracy, and eliminates human error.

• The tangent method measurement method is measured by manually drawing the baseline and arc tangents, which is suitable for images with severe asymmetry, and is analyzed manually, with a display accuracy of 0.1°.

• The measurement method of the height method is to calculate the contact angle value by drawing the external rectangle of the droplet, and the contact angle value is displayed with an accuracy of 0.1°.

• The angle measurement method realizes the measurement of the contact angle by drawing the protractor. The contact angle value shows an accuracy of 0.1°.

• Contact angle measurement range for all methods: 0~180°

Surface tension analysis method

• The surface tension analysis is carried out by the hanging drop method, and the analysis results are displayed in the form of a list.

Injector control

• The injector adopts an automatic microsampler, which realizes automatic sample injection and withdrawal through computer control, and cooperates with the video recording and timed photo functions to easily realize the dynamic contact angle test of the droplet method.

• Quantitative injection function: click the button once, inject the specified quantity, the accuracy is 1uL.

• Quantitative discharge function: click the button once, the specified quantity of sample discharge, the accuracy is 1uL. This function is used to measure dynamic contact angles by increasing or subtracting droplets.

• Continuous injection function: continuous advance injection.

• Continuous Withdrawal Function: Continuous retreat of liquid.

• The injection and withdrawal speed is adjustable.

• Injector calibration function for calibrating the accuracy of quantitative injection and withdrawal.

Video processing methods

• Small window preview, large window photo and analysis. The main interface of the software has a video display window, which is used to display the video captured by the camera or the video file played. Click on the thumbnail after taking the photo to enter the contact angle analysis interface or surface tension analysis interface, which is easy to operate.

• Video recording and image capture functions. The test process can be recorded in real time, and the software can capture photos frame by frame after recording the video, which is convenient for capturing rapid dynamic changes.

• Single photo function. The current frame displayed in the video is captured and saved, and displayed as a thumbnail in the main window.

• Continuous timing camera function, the timing time can be adjusted arbitrarily. The interval between photos can be set, and the photo can be taken automatically after the interval time is reached, which is convenient for analyzing the dynamic change process of contact angle and surface tension.

Document and image management

• You can save a single image and select the analysis tool that appears on the image.

• All test data and pictures can be saved as a whole.

• The test results are displayed as a list and can be exported to an Excel file.

• The brightness, contrast, chromaticity and other information of the camera image and the brightness of the backlight are adjusted by the software settings.

• You can set the save path for videos and photos.

• Parameters related to surface tension testing can be set.

• Photo results image zoom and crop functions.

Surface energy calculation

• The surface energy calculation function provides the Fowkes equation, Owens equation, and YGGF equation calculation methods.

operating environment

• Uses 64-bit Windows operating system.

• It is recommended that the memory is more than 4G, and the hard disk space is not less than 10G.

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[Note] Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.