Contact angle measuring instrument

As is well known, nanomaterials science and engineering have become a global research hotspot. When studying surface modification of nanomaterials, the concept of wetting contact angle is often involved. The so-called contact angle refers to the angle formed when a liquid droplet is dropped on a horizontal plane of a solid, and the gas-liquid interface and the two tangent lines of the solid-liquid interface sandwich the liquid phase at the boundary point of the solid liquid gas three-phase on the surface of the solid.

Contact angle measuring instrumentIt is mainly used to measure the contact angle between liquid and solid, that is, the wettability of liquid to solid, and can also measure the contact angle when the external phase is liquid. This instrument can measure the contact angle of various liquids with various materials, such as block materials, fiber materials, textile materials, etc. Powder samples can also be measured after compression. At the same time, this series of instruments can measure and calculate surface/interface tension, droplet shape and size, and surface free energy.

Analysis method based on optical morphology

Sitting drip methodContact angle of liquid droplets on solid surfaces

Bubble trapping methodMeasure the contact angle between the bottom of the solid material immersed in the liquid phase and the bubbles

Rolling analysisThe forward and backward angles of droplets when rolling off a sloping surface

hanging drop methodMeasuring surface or interfacial tension using the curved contour of liquid suspended at the bottom of the needle

surface free energyCalculate solid surface energy through contact angle data

SCI5000Type optical precision contact angle measuring instrument

1、 Test indicators

1. Contact angle measurement range: 0-180 °,

2. Rolling angle measurement range: 0-90 °,

3. Contact angle resolution: 0.01 °,

4. Contact angle measurement accuracy: ± 0.1 °

5. Surface tension testing method: Suspension drop method

6. Surface tension testing range: 0-2000mN/m,

7. Resolution of surface tension test: 0.01mN/m

2、 Hardware specifications

1Sample stage control:

(1) Manual forward and backward movement, stroke 50mm, accuracy 0.1mm

(2) Left and right manual movement, stroke 50mm, accuracy 0.1mm

(3) Manual up and down movement, stroke 50mm, accuracy 0.1mm

(4) Sample table size: 100mm × 70mm (platform size can be customized according to needs)

(5) Rotation: Automatic overall rotation, measuring rolling angle, forward angle, backward angle, software displays rolling angle size in real-time (optional)

(6) Temperature control system: Temperature control range: Room temperature~400 ℃ (optional)

2Injector control:

(1) Up and down movement stroke 50mm, accuracy 0.1mm

(2) Dual control high-precision automatic injection system, software automatically controls the injection volume and the overall up and down operation of the injection device, which can accurately control both sample addition and sampling, with an injection accuracy of 0.1 microliters (optional)

3Imaging system:

(1) Optical zoom continuously adjustable high-definition lens

(2) CCDParameters: Professional industrial camera, shooting speed: 100 frames per second (optional)

(3) Lens front and rear adjustment, stroke 10mm, accuracy 0.1mm

(4) Lens left and right adjustment, stroke 10mm, accuracy 0.1mm

(5) Top view adjustment of the lens, tilt platform adjustment, adjustable pitch angle and levelness of the lens

(6) The overall structure of the instrument includes a seven dimensional motion adjustment mode

3、 Specialized testing software functionality

1. Special software for image acquisition and analysis, with multiple analysis methods: automatic image analysis method (ellipse fitting method, double angle fitting method, Young Laplace analysis method), angle measurement method, height measurement method, geometric method, five point fitting method, insertion plate method, hanging droplet fitting method, etc;

2. Continuous dynamic measurement of contact angle: Continuous dynamic measurement, adjustable speed, minimum 0.01 seconds, can automatically select to perform continuous automatic measurement on the sample within a certain period of time. The contact angle measurement value is displayed as a curve over time and stored in the database system in both image and data formats for export at any time when needed.

3. Four shooting modes: single shot, continuous interval shooting (adjustable from 0.5 to 3600s), continuous fast shooting (fast shooting speed of 100 frames per second), video shooting, etc

4. Measurement modes: single measurement, continuous interval automatic measurement, continuous rapid automatic measurement

5. Contact angle data acquisition method: combining fully automatic measurement and manual adjustment. According to the test, the software automatically takes photos, searches for sensitive points, calculates contact angle values, and displays the calculation results. The entire process does not require manual intervention to reduce the influence of human factors; Comparison of left and right angles, calculation of left and right angles and taking the average, surface correction, used for measuring contact angles of concave and convex surfaces.

6. Surface free energy can be selected from various methods such as Ziman one liquid method, EOS equilibrium method, Owen two liquid method, Wu's two liquid method, Louis acid-base three liquid method, etc

7. Equipped with a solid-liquid interfacial tension testing window

8. Database management function: Store, modify, filter, and export EXCEL tables. Measurement values and fitting results can be saved to images, which are intuitive and clear. The generated graphic and textual reports can be printed directly

9. Video recording function: Record AVI format film and television images, which can be used for PPT file production, etc

10. Software: Analysis specific software, lifetime free upgrade.

4、 List of selected accessories

1. Temperature control platform: Select the temperature control range as needed

2. Overall rotation: measures rolling angle, forward angle, backward angle, and can automatically sense rolling angle

3. Fully automatic sampling system: dual motor control, controlling the injection volume and up and down operation, capable of precise sample addition and sampling;

4. High speed camera: Choose a camera with a higher frame rate (100-2000 frames per second) as needed

5. Liquid liquid solid measuring device: testing the contact angle between liquid liquid solid and liquid gas solid

6. Special device for measuring powder samples: used for tablet testing of powder samples

7. Locking micro injector: needle interchangeable, used for testing superhydrophobic materials

8. Fiber scaffold: used for measuring fiber samples

9. Computer with pre installed software