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

作　　者：Bohong Li Lan Jiang Xiaowei Li Zhipeng Wang Peng Yi 

机构地区：[1]Laser Micro/Nano Fabrication Laboratory,School of Mechanical Engineering,Beijing Institute of Technology,Beijing,People’s Republic of China [2]Beijing Institute of Technology Chongqing Innovation Center,Chongqing,People’s Republic of China [3]Yangtze Delta Region Academy of Beijing Institute of Technology,Jiaxing,People’s Republic of China

出　　处：《International Journal of Extreme Manufacturing》2024年第2期502-509,共8页极端制造（英文）

基　　金：supported by the Beijing Municipal Natural Science Foundation(JQ20015);National Key Research and Development Program of China(No.2022YFB4601300);the National Science Fund for Distinguished Young Scholars(No.52325505);the National Natural Science Foundation of China(NSFC)(No.52075041);the Joint Funds of the National Natural Science Foundation of China(Grant No.U2037205);the Open Project Program of Wuhan National Laboratory for Optoelectronics(No2021WNLOKF016)。

摘　　要：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.

关 键 词：SELF-PROPELLED Leidenfrost droplets periodic hydrophobicity gradient femtosecond laser fabrication 

分 类 号：TB306[一般工业技术—材料科学与工程] TN249[电子电信—物理电子学]