Fabrication of extreme wettability surface for controllable droplet manipulation over a wide temperature range

作     者：Chengsong Shu Qitong Su Minghao Li Zhenbin Wang Shaohui Yin Shuai Huang Chengsong Shu;Qitong Su;Minghao Li;Zhenbin Wang;Shaohui Yin;Shuai Huang

作者机构：College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082People’s Republic of China National Engineering Research Center for High Efficiency GrindingHunan UniversityChangsha 410082People’s Republic of China 

出 版 物：《International Journal of Extreme Manufacturing》 (极端制造（英文）)

年 卷 期：2022年第4卷第4期

页      面：246-259页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Key R&D Program of China(Grant No.2017YFE0116900) the National Natural Science Foundation of China(NSFC,Grant Nos.52275420 and 52130503) the Science and Technology Planning Project of Hunan Province(Grant No.2020WK2011) Postgraduate Scientific Research Innovation Project of Hunan Province(Grant No.CX20200409) 

主　　题：extreme wettability surface superhydrophobic controlled evaporation controlled bouncing controlled transport 

摘      要：Droplet controllable manipulation over a wide temperature range has promising applications in microelectronic heat dissipation, inkjet printing, and high temperature microfluidic system. However, the fabrication of a platform for controllable droplet manipulation using the methods commonly used in industry remains a tremendously challenge. The popular method of controlling droplets is highly dependent on external energy input and has relatively poor controllability in terms of droplet motion behaviors and manipulation environment, such as distance, velocity, direction and a wide temperature range. Here, we report a facile and industrially applicable method for preparing Al superhydrophobic (S-phobic) surfaces, which enables controlled droplet bouncing, evaporation, and transport over a wide temperature range. Systematic mechanistic studies are also investigated. Extreme wettability surfaces were prepared on Al substrate by a composite process of electrochemical mask etching and micro-milling. To investigate the evaporation process and thermal coupling characteristics, controlled evaporation and controlled bouncing of droplet in a wide temperature range were conducted. Based on the evaporation regulation and bouncing mechanism of droplets on an extreme wettability surface, by using Laplace pressure gradients and temperature gradients, we realized controlled transport of droplets with confluence, split-flow, and gravity-resistant transport over a wide temperature range, offering a potential platform for a series of applications, such as new drug candidates and water collection.