Static contact angle calculation method

A technology of static contact angle and calculation method, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problem of inability to calculate static contact angle, and achieves the effect of less programming difficulty, short time-consuming, and reducing errors

Inactive Publication Date: 2013-04-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the above technology cannot accurately calculate the static contact angle under different hydrophobicity and droplet volume, the present invention provides a calculation method for the static contact angle

Method used

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Embodiment 1

[0106] In order to make the experimental results more convincing, the static contact angles were selected as 7°, 108° and 177° which had not been calculated, and the volume of water droplets was also different from the calculated case. The calculated results of the original circle fitting method and the revised circle fitting method proposed by the present invention are as attached Figure 9 shown.

[0107] attached by Figure 9 It can be seen that when the original circle fitting method is used, the algorithm error gradually increases with the increase of the volume of the water droplet, and the volume of the water droplet is less than 1000 μL and the length of the contact line is not greater than 2 cm. When the actual contact angles are 7°, 108° and 177° °, the maximum errors of the original circle fitting method were -3.52°, -64.54° and -115.66° respectively. After adopting the algorithm of the present invention to amend, even if the calculation result of the volume incre...

Embodiment 2

[0109] Drop 5, 10, 20, 50, 100, 200, 500, and 1000 μL of deionized water on the silicone rubber sample, respectively. The calculation result of the circle fitting method and the circle fitting method calculation result of the correction proposed by the present invention are as attached Figure 10 shown. The edges and contact angles obtained by the circle fitting method of the real water drop images when the water drop volumes are 5 and 100 μL are shown in the attached Figure 11 shown.

[0110] attached by Figure 10 It can be seen that for the real water drop image, the error of the circle fitting method gradually increases with the increase of the volume of the water drop. Figure 7 The simulation results of b are in good agreement. The contact angle calculated by the modified circle fitting method proposed by the present invention under different water drop volumes all changes around 109°, with a maximum deviation of 4.14° and a standard deviation of 2.63°. Obviously, ...

Embodiment 3

[0112] There is a super-hydrophobic sample, and about 9 μL of deionized water is dropped on it. The calculation results of the obtained image using the circle fitting method and the ADSA-P method are shown in the attached Figure 12 shown.

[0113] attached by Figure 12 It can be seen that when the static contact angle is very large, although the volume of the water drop is not too large, there is still a large error in the circle fitting method, and there is a significant gap between the obtained water drop edge and the real water drop edge, especially at the critical triple line Nearby, the follow-up analysis shows that its error is about -18.62°. The ADSA-P method can fit the edge of the water drop very well, and the obtained contact angle is 166.24°, the accuracy is guaranteed, and it can easily calculate the interfacial tension. But its principle is more complex, programming is difficult, and calculation time is longer, such as attached Figure 12 The calculation time...

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Abstract

The invention discloses a static contact angle calculation method in the technical field of material performance test. The method includes: simulating to generate droplet margins of different sizes and contact angles on the basis of the Young-Laplace equation; calculating the contact angles of the droplet margins generated by simulation to obtain relation among the calculated contact angles, the droplet sizes and the real contact angles; taking a picture of a real droplet image and calculating the contact angle of the image; and using the interpolation or similar methods to obtain accurate contact angles according to the contact angle of the actual image and the relation among the calculated contact angles, the droplet sizes and the real contact angles. Errors brought by large droplet sizes and contact angles to the circle fitting method and theta/2 method can be effectively reduced, calculation efficiency is improved, and programming difficulty is lowered.

Description

technical field [0001] The invention belongs to the technical field of material performance testing, in particular to a calculation method of a static contact angle. Background technique [0002] Hydrophobicity is an important property of the material surface and a key indicator of many materials. Hydrophobicity can be reflected by the contact angle. The contact angle is divided into static contact angle and dynamic contact angle. The static contact angle is the corresponding contact angle when the droplet is in a static state, which satisfies the Young-Laplace equation. [0003] The static contact angle is mainly measured by the sessile drop method. With the development of electronic computer technology, at present, the droplet image is often stored as an electronic image, and various algorithms are used to calculate the static contact angle. The earliest method was the tangent method. This method is the tangent of the droplet at the triple line, and the contact angle is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26G01N13/00
Inventor 徐志钮律方成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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