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.
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The authors acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. U1809214 and U1809213), the National Basic Research Program of China (973 Program) (Grant No. 2013CB632302), the Foundation of Key Laboratory of Marine Materials and Related Technologies, Chinese Academy of Sciences (2018K01), and the Foundation of Key Laboratory of Marine Materials and Related Technologies, CAS (2018K01).
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Longyang LI. He received his Ph.D. degree in materials processing engineering from the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (CAS), in 2019. Then, he joined the Key Laboratory of Marine Materials and Related Technologies at Ningbo Institute of Materials Technology and Engineering, CAS. His current position is as a research assistant in the laboratory. His research areas cover the tribology of composite materials and tribology of bionic.
Jingfang ZHU. She received her master degree in materials processing engineering in 2017 from the North University of China, Taiyuan, China. She is now a Ph.D. student in the Key Laboratory of Micro-Electro-Mechanical System (MEMS) of Ministry of Education, Southeast University, Nanjing, China. Her research interests focus on oil-water separation.
Zhixiang ZENG. He received his Ph.D. degree in materials science from the Lanzhou Institute of Chemical Physics, CAS, in 2009. Then, he joined the Key Laboratory of Marine Materials and Related Technologies at Ningbo Institute of Materials Technology and Engineering, CAS. His current position is as a professor. His research areas cover interface control and bionic drag reduction of the marine vehicle, electrochemical chemical deposition and corrosion and wear characteristics of the coating, and marine oil pollution treatment and oil-water separation materials.
Eryong LIU. He received his Ph.D. degree in materials science and engineering from Xi’an Jiaotong University, 2013. Then, he joined the School of Materials Science and Engineering, Xi’an University of Science and Technology. His current position is as an associate professor. His research areas cover the surface engineering and materials performance.
Qunji XUE. He received his master degree in materials science from the Lanzhou Institute of Chemical Physics, CAS, in 1967. Since 2010, he joined the Key Laboratory of Marine Materials and Related Technologies at Ningbo Institute of Materials Technology and Engineering, CAS. His current position is an academician of the Chinese Academy of Engineering. He created the Key Lab of Marine Materials and Application technologies. And now, besides tribology, marine materials and technologies such as drag reduction and noise reduction technology, surface enhancement of key parts for marine equipments, oil absorption materials, antifouling paints, and anti-corrosive paints, are also his research interests.
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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 9, 1012–1024 (2021). https://doi.org/10.1007/s40544-020-0392-1
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DOI: https://doi.org/10.1007/s40544-020-0392-1