International Journal of Extreme Manufacturing, Volume. 6, Issue 2, 25502(2024)

Self-propelled Leidenfrost droplets on femtosecond-laser-induced surface with periodic hydrophobicity gradient

Bohong Li1, Lan Jiang1,2,3、*, Xiaowei Li1, Zhipeng Wang1, and Peng Yi1
Author Affiliations
  • 1Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, People’s Republic of China
  • 2Beijing Institute of Technology Chongqing Innovation Center, Chongqing, People’s Republic of China
  • 3Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing, People’s Republic of China
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    The controllable transfer of droplets on the surface of objects has a wide application prospect in the fields of microfluidic devices, fog collection and so on. The Leidenfrost effect can be utilized to significantly reduce motion resistance. However, the use of 3D structures limits the widespread application of self-propulsion based on Leidenfrost droplets in microelectromechanical system. To manipulate Leidenfrost droplets, it is necessary to create 2D or quasi-2D geometries. In this study, femtosecond laser is applied to fabricate a surface with periodic hydrophobicity gradient (SPHG), enabling directional self-propulsion of Leidenfrost droplets. Flow field analysis within the Leidenfrost droplets reveals that the vapor layer between the droplets and the hot surface can be modulated by the SPHG, resulting in directional propulsion of the inner gas. The viscous force between the gas and liquid then drives the droplet to move.

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    Bohong Li, Lan Jiang, Xiaowei Li, Zhipeng Wang, Peng Yi. Self-propelled Leidenfrost droplets on femtosecond-laser-induced surface with periodic hydrophobicity gradient[J]. International Journal of Extreme Manufacturing, 2024, 6(2): 25502

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    Paper Information

    Received: May. 9, 2023

    Accepted: --

    Published Online: Sep. 6, 2024

    The Author Email: Jiang Lan (jianglan@bit.edu.cn)

    DOI:10.1088/2631-7990/ad18fb

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