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

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

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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.

self-propelledLeidenfrost dropletsperiodic hydrophobicity gradient femtosecond laser fabrication

Bohong Li、Lan Jiang、Xiaowei Li、Zhipeng Wang、Peng Yi

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Laser Micro/Nano Fabrication Laboratory,School of Mechanical Engineering,Beijing Institute of Technology,Beijing,People's Republic of China

Beijing Institute of Technology Chongqing Innovation Center,Chongqing,People's Republic of China

Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing,People's Republic of China

Beijing Municipal Natural Science FoundationNational Key Research and Development Program of ChinaNational Science Fund for Distinguished Young ScholarsNational Natural Science Foundation of China(NSFC)Open Project Program of Wuhan National Laboratory for OptoelectronicsJoint Funds of the National Natural Science Foundation of China

JQ200152022YFB460130052325505520750412021WNLOKF016U2037205

2024

10.1088/2631-7990/ad18fb

极端制造(英文)

极端制造(英文)

CSTPCDEI
ISSN：
年,卷(期)：2024.6(2)