Principle of Hako Water Drop Angle Tester The contact angle refers to the angle θ between the tangent of the gas-liquid interface at the intersection of gas, liquid, and solid phases and the solid-liquid boundary line, and is a measure of the degree of wetting. If θ<90 °, the solid is hydrophilic, meaning that the liquid can wet the solid. The smaller the angle, the better the wettability; If θ>90 °, the solid is hydrophobic, meaning that the liquid does not wet the solid and can easily move on the surface without entering the capillary pores.

Video contact angle testerTesting method:

There are usually two existing testing methods for contact angle: one is the shape image analysis method; The second method is the weighing method The latter is commonly referred to as a wetting balance or a permeation contact angle meter But currently, the most direct and accurate measurement method is still the shape image analysis method, which is widely used The principle of the shape image analysis method is to drop liquid droplets onto the surface of a solid sample, obtain the shape image of the droplets through a microscope lens and camera, and then use digital image processing and some algorithms to calculate the contact angle of the droplets in the image The method of calculating contact angle is usually based on a specific mathematical model, such as a droplet being considered as a part of a sphere or cone, and then the contact angle value is calculated by measuring specific parameters such as width/height or by direct fitting. The Young Laplace equation describes the relationship between the internal and external pressure difference of a closed interface and the curvature and tension of the interface, which can be used to accurately describe the contour of an axisymmetric droplet and calculate its contact angle.

Principle of Hako Water Drop Angle TesterProduct parameters

lSample table size: 100mm * 120mm

lContact angle measurement range: 0-180 °

lContact angle measurement accuracy: ± 0.1 °

lContact angle display accuracy: ± 0.01 °

lSurface/Interface Tension Testing Method: Suspended Drop Method

lSurface/Interface Tension Test Range: 0-1000mN/m

lOptical system: ZF-180 high-definition card zoom lens

lVideo system: USB 2.0 camera+PC soft control 30 frames per second (optional 100 frames per second, 300 frames per second, 1000 frames per second or higher)

lInstrument dimensions: 260mm * 700mm

lCamera movement stroke: 120mm

lInstrument weight: approximately 30kg

lMeasurement software: HARKE-SPCA1.0

lPower supply: 220V/3A/50Hz

lMeasurement temperature: room temperature

lSurface energy testing method: EOS

lMeasurement methods: circular ring method, ellipse method, small droplet method, etc

Basic functions of HARKE-SPCA contact angle measuring instrument

lManual precision injection

lEOS solid surface free energy provides

lHARKE-SPCA1.0 Contact Angle Measuring Instrument Software

HARKE-SPCA Contact Angle Measuring Instrument Optional Additional Item

lElectric heating temperature control

lElectric tilting table