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Research Article | Open Access

Effect of surface roughness on the angular acceleration for a droplet on a super-hydrophobic surface

Longyang LI1, Jingfang ZHU2, Zhixiang ZENG1(), Eryong LIU3, Qunji XUE1
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 210096, China
School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
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Abstract

The motion of droplets on a super-hydrophobic surface, whether by sliding or rolling, is a hot research topic. It affects the performance of super-hydrophobic materials in many industrial applications. In this study, a super-hydrophobic surface with a varied roughness is prepared by chemical-etching. The adhesive force of the advancing and receding contact angles for a droplet on a super-hydrophobic surface is characterized. The adhesive force increases with a decreased contact angle, and the minimum value is 0.0169 mN when the contact angle is 151.47°. At the same time, the motion of a droplet on the super-hydrophobic surface is investigated by using a high-speed camera and fluid software. The results show that the droplet rolls instead of sliding and the angular acceleration increases with an increased contact angle. The maximum value of the angular acceleration is 1,203.19 rad/s2 and this occurs when the contact angle is 151.47°. The relationship between the etching time, roughness, angular acceleration, and the adhesion force of the forward and backward contact angle are discussed.

Keywords

super-hydrophobic surfaceadhesive forcerolling frictioncontact angle

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Friction
Volume 9 Issue 5,
October 2021
Pages 1012-1024
DOI: 10.1007/s40544-020-0392-1
Cite this article:
LI L, ZHU J, ZENG Z, et al. Effect of surface roughness on the angular acceleration for a droplet on a super-hydrophobic surface. Friction, 2021, 9(5): 1012-1024. https://doi.org/10.1007/s40544-020-0392-1
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