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http://dx.doi.org/10.7736/KSPE.2012.29.9.1020

Fabrication of a Micro/Nano-scaled Super-water-repellent Surface and Its Impact Behaviors of a Shooting Water Droplet  

Kim, Hyung-Mo (Department of Mechanical Engineering, POSTECH)
Lee, Sang-Min (Department of Mechanical Engineering, POSTECH)
Lee, Chan (Department of Mechanical Engineering, POSTECH)
Kim, Moo-Hwan (Division of Advanced Nuclear Engineering, POSTECH)
Kim, Joon-Won (Department of Mechanical Engineering, POSTECH)
Publication Information
Journal of the Korean Society for Precision Engineering / v.29, no.9, 2012 , pp. 1020-1025 More about this Journal
Abstract
In this study, we fabricated the superhydrophobic and super-water-repellent surface with the micro/nano scale structures using simple conventional silicon wet-etching technique and the black silicon method by deep reactive ion etching. These fabrication methods are simple but very effective. Also we reported the droplet impact experimental results on the micro/nano-scaled surface. There are two representative impact behaviors as "rebound" and "fragmentation". We found the transition Weber number between "rebound" and "fragmentation" statements, experimentally. Additionally, we concerned about the dimensionless spreading diameters for our super-water-repellent surface. The novel characterization method was introduced for analysis including the "fragmentation" region. As a result, our super-water-repellent surface with the micro/nano-scaled structures shows the different impact behaviors compared with a reference smooth surface, by some meaningful experiments.
Keywords
Super-water-repellency; Surface Modification; Droplet Impact Behaviors; Micro/Nano Surface Structures;
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