Detecting method of hydrophobic static contact angle
A technology of static contact angle and detection method, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of low calculation accuracy, and achieve the effect of high calculation accuracy and wide adaptability.
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Embodiment 1
[0139] This embodiment verifies the effect of the simulated water drop image:
[0140] Depend on Figure 3a It can be seen that when the contact angle is 90° and the volume of water droplets is less than 100 μL, the maximum error of the ellipse fitting algorithm is only -1.37°. When the volume of the small water droplet is 0.51 μL, the error of the ellipse fitting algorithm is -0.05°, which is small, which is the same as Figure 4a The edge obtained by the middle ellipse fitting algorithm is in good agreement with the corresponding edge of the Young-Laplace equation. Since the contact angle is less than 110°, the ellipse fitting algorithm will also be selected according to the present invention, so the present invention has higher accuracy at this time. When the contact angle is 90° and the volume of the water droplet is 101.18 μL, the error of the ellipse fitting algorithm is only -1.25°, which is consistent with Figure 4bThe effect of the ellipse fitting algorithm is good...
Embodiment 2
[0144] Silicone rubber materials were selected, which were clean high temperature vulcanization (HTV) silicone rubber samples, ZnSO 4 A mixture of diatomaceous earth and diatomaceous earth is coated on the surface, and a room temperature vulcanization (RTV) silicone rubber coating is applied after the hydrophobicity migrates. Choose deionized water. For clean samples, the volumes of water droplets are 5, 10, 20, 50, and 100 μL, and for contaminated samples, the volumes of water droplets are 10, 20, 50, and 100 μL. The approximate contact angle of the clean sample is about 105°, and the ADSA-P algorithm has no obvious advantages over the ellipse fitting algorithm when the volume of the water droplet is small under this hydrophobicity, and the algorithm is more likely to be disturbed by factors such as unclear images and deflection, so Only the calculation result of the ellipse fitting algorithm at this time is given in the invention, such as Figure 5 shown.
[0145] Depend o...
Embodiment 3
[0147] Select a material with micro-nano morphology and super-hydrophobicity on the surface, and the volume of the water droplets in the super-hydrophobic image is about 6 μL. The edge and contact angle obtained by fitting the superhydrophobic image with the ellipse fitting algorithm and the ADSA-P algorithm are as follows: Figure 8 shown. Depend on Figure 8 a It can be seen that for the superhydrophobic image, the edge of the water drop obtained by the ellipse fitting algorithm can be in good agreement with the actual edge of the water drop in most areas, but there is an obvious gap near the key triple line, so that the contact angle calculation results are not small error, and Figure 8 In b, the ADSA-P algorithm selected by the present invention according to the algorithm selection principle can better match the entire water drop edge, and the accuracy of the obtained contact angle is guaranteed, which is 166.24°, while the calculation result of the ellipse fitting algo...
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