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. Performance and index of hardware

1) Industrial Camera

Color mode: colorful

Maximum resolution:2048*1536 pixels

Minimum resolution: 640*480 pixels

Video frame rate: maximum frame rate 25FPS。

2) Microscope

Zoom ratio:0.7~4.5X

Magnification:30~130

Distance:95mm

Tube length:168mm

Angle of view:18mm

3) Focusing frame

F-type focusing frame

Adjustment range:60mm

4) 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

5) The stage above

Size:70*45mm, fillet on one side

6) Sample injector

Minimum injection volume resolution:2.5μL

Adjustable upper and lower range:12mm

Adjustable left and right range:12mm

Sample injector capacity:5mL

7) Backlight

The light source is a semiconductor cold light source, and the measurement is continuously adjustable.

2. Software function

1) 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

8) 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

9) 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

10) Surface energy calculation

Fowkes equation, Owens equation and YGGF equation are provided.

11) 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.