Triboelectric‘electrostatic tweezers'for manipulating droplets on lubricated slippery surfaces prepared by femtosecond laser processing  

作　　者：Jiale Yong Xinlei Li Youdi Hu Yubin Peng Zilong Cheng Tianyu Xu Chaowei Wang Dong Wu 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei 230027,People’s Republic of China

出　　处：《International Journal of Extreme Manufacturing》2024年第3期411-426,共16页极端制造（英文）

基　　金：supported by the USTC Research Funds of the Double First-Class Initiative(Nos.YD2090002013,YD234000009);the National Natural Science Foundation of China(Nos.61927814,62325507,52122511,U20A20290,62005262)。

摘　　要：The use of‘Electrostatic tweezers'is a promising tool for droplet manipulation,but it faces many limitations in manipulating droplets on superhydrophobic surfaces.Here,we achieve noncontact and multifunctional droplet manipulation on Nepenthes-inspired lubricated slippery surfaces via triboelectric electrostatic tweezers(TETs).The TET manipulation of droplets on a slippery surface has many advantages over electrostatic droplet manipulation on a superhydrophobic surface.The electrostatic field induces the redistribution of the charges inside the neutral droplet,which causes the triboelectric charged rod to drive the droplet to move forward under the electrostatic force.Positively or negatively charged droplets can also be driven by TET based on electrostatic attraction and repulsion.TET enables us to manipulate droplets under diverse conditions,including anti-gravity climb,suspended droplets,corrosive liquids,low-surface-tension liquids(e.g.ethanol with a surface tension of 22.3 mN·m^(-1)),different droplet volumes(from 100 nl to 0.5 ml),passing through narrow slits,sliding over damaged areas,on various solid substrates,and even droplets in an enclosed system.Various droplet-related applications,such as motion guidance,motion switching,droplet-based microreactions,surface cleaning,surface defogging,liquid sorting,and cell labeling,can be easily achieved with TETs.

关 键 词：triboelectric electrostatic tweezer droplet manipulation slippery surface superhydrophobic surface femtosecond laser 

分 类 号：TH117.1[机械工程—机械设计及理论] TG665[金属学及工艺—金属切削加工及机床] TS914.5[轻工技术与工程]