Adaptability of Circle Equation Based Static Contact Angle Algorithms for Measuring Hydrophobicity of the Material Surface

Zhi Niu Xu; Yan Peng Ma; Hai Jun Xiong; Jing Gang Liu

doi:10.4028/www.scientific.net/AMR.1023.19

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1023Adaptability of Circle Equation Based Static...

Adaptability of Circle Equation Based Static Contact Angle Algorithms for Measuring Hydrophobicity of the Material Surface

Abstract:

For more accurate evaluation of the static contact angle, the height-width method and circle fitting algorithm are investigated, the comparison of some factors on the two algorithms are analyzed, including difficulties of programming, computational complexity, influence of dimensionless drop volume, contact angle and edge noise on accuracy. The critical dimensionless drop volumes corresponding to a contact angle error of 3° are given. The results indicate that: the programming of height-width method is more difficult than that of the circle fitting algorithm, the computational complexity of the height-width method is less than that of the circle fitting algorithm. The errors of the two algorithms increase with the drop volume and contact angle, the height-width method is more accurate than that of the circle fitting algorithm, the errors acceleration decrease/increase with the drop volume/contact angle. The critical dimensionless drop volumes of the two algorithms decrease as the contact angle increases, and them will tend to saturation. The noise-resistant capacity of the circle fitting algorithm is better that the height-width method. Therefore, the circle fitting algorithm should be selected in the condition of high noise level. Otherwise the height-width method should be selected.