Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Fabrication of a Micro/Nano-scaled Super-water-repellent Surface and Its Impact Behaviors of a Shooting Water Droplet

마이크로/나노 구조를 갖는 초발수성 표면의 제작 및 분사 액적의 충돌 특성 연구

  • 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)
  • 김형모 (포항공과대학교 기계공학과) ;
  • 이상민 (포항공과대학교 기계공학과) ;
  • 이찬 (포항공과대학교 기계공학과) ;
  • 김무환 (포항공과대학교 첨단원자력공학부) ;
  • 김준원 (포항공과대학교 기계공학과)
  • Received : 2012.03.08
  • Accepted : 2012.06.29
  • Published : 2012.09.01
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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

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