I. Overview
The contact angle measuring device is used to measure the contact angle formed between solid-liquid-gas three-phase interfaces, and then analyze the interaction between three-phase media, and thus analyze the surface energy of solids and other data. Contact angle measuring device is a necessary instrument for thermodynamics, physical chemistry and surface chemistry.
Our contact angle measuring device adopts a high-resolution industrial camera and a microscope lens, which obtains a clear interface image by photographing a solid-liquid-gas three-phase interface.
The camera provides a video recording function, which can record every moment of change for a high-speed changing interface, and then capture the key images of its changes for analysis through playback at any speed.
The software adopts the latest international contact angle measurement and surface energy calculation method. A variety of contact angle measurement methods and surface energy calculation methods can be directly compared in order to find the ideal measurement and calculation method in line with the interface.
The contact angle measuring device is widely used in petroleum, chemical industry, medicine, manufacturing, dyestuff and other areas, and is suitable for universities, research institutes, machinery, factories and other departments.
II. Main structure and technical index
Main structure
The instrument is mainly shown in Figure 1-1.
Figure 1－1 Main structure of contact angle measuring device
Performance and index of hardware
Industrial Camera
Color mode: colorful
Maximum resolution:2048*1536 pixels
Minimum resolution: 640*480 pixels
Video frame rate: maximum frame rate 25FPS。
Microscope
Zoom ratio:0.7~4.5X
Magnification:30~130
Distance:95mm
Tube length:168mm
Angle of view:18mm
Focusing frame
F-type focusing frame
Adjustment range:60mm
The stage below
Modes of movement: Manual movement, smooth optical components
Stage dimensions:125*95mm
X direction (horizontal):80mm,precision0.1mm
Y direction (longitudinal):30mm,precision0.1mm
Z direction (up and down):50mm
The stage above
Size:70*45mm, fillet on one side
Sample injector
Minimum injection volume resolution:2.5μL
Adjustable upper and lower range:12mm
Adjustable left and right range:12mm
Sample injector capacity:5mL
Backlight
The light source is a semiconductor cold light source, and the measurement is continuously adjustable.
Software function
Take pictures
Single photo shooting and continuous photo shooting (the interval time can be set arbitrarily)
Photo resolution:1280*960、1024*768、800*600、640*480
Picture preview function
Image gain adjustment function, brightness adjustment function
Video recording and video analysis
Replay the video
Replay a snapshot
Capture photos frame by frame
It can play forward and backward in a single frame
Contact angle measurement
Automatic measurement method: pictures with obvious baseline position characteristics can be measured automatically, and pictures with no obvious baseline characteristics need to be manually marked with baseline position.
Measurement by measuring the height: draw the baseline rectangle of the droplet and calculate the contact angle automatically.
Measurement by measuring the angle: measured by protractor tool
Tangent method: a completely manual way to calculate the contact angle by drawing the base line and the tangent line
Surface energy calculation
Fowkes equation, Owens equation and YGGF equation are provided.
Picture and data management
After the picture is taken, enters the thumbnail list.
You can add an existing picture to the thumbnail list.
You can save the picture to disk separately, and you can select the test tool on which the picture is drawn.
Click the thumbnail to open the analysis interface for contact angle analysis.
Various contact angle analysis results are automatically added to the results list.
The list of results can be exported as an Excel table.
The analysis results can be saved to the project file as a whole and can be opened again for editing.