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Citation: Chengzu He, Bo Zhao, Zhixia Tang. Measurement of the Contact Angle by Ellipse Method[J]. Chemistry, ;2021, 84(4): 394-399. shu

Measurement of the Contact Angle by Ellipse Method

Chengzu He ^{1, 2} ,
Bo Zhao ^2,, ,
Zhixia Tang ²

1.
Chengdu University of Science and Engineering, Chengdu, 610059
2.
Xinjiang Keli New Technology Development Company Ltd, Karamay, 834000

Corresponding author: Bo Zhao, xjklzb@126.com
Received Date: 3 September 2020
Accepted Date: 2 November 2020

Figures(4)

The contact angle is a key physical parameter in the areas of colloid and surface chemistry, mineral flotation, washing, and oil and gas exploitation. In this study, an easy-to-use contact angle measurement method has been proposed. When the contact angle is less than 90°, the radius of the major axis and the minor axis of the ellipse and the coordinates of the oil-water-solid contact point are calculated; when the contact angle is greater than 90°, merely needs to select two points on the ellipse contour line and measure four data. The oil drop profile is converted into a PowerPoint (PPT) diagram with the MS Office PowerPoint software and the tangents calculated by the ellipse method are displayed on the diagram, which is conducive to reducing the influence of human factor on drawing tangents under the sessile drop method. When the contact angle is greater than 90°, the contact angle can be calculated according to the radius of the major axis and the minor axis of the ellipse on the PPT diagram. The research results of 11 kinds of oil-water-solid systems showed that the calculation method presented in this paper is consistent with the tangent method, the contact angle calculated by half angle method is 50°~60° larger than that measured by tangent method, so it is not suitable for application.
- Contact angle,
- Sessile drop method,
- Half-angle method,
- Ellipse method
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