Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)
- 2010.02a
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- Pages.365-365
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- 2010
Superhydrophobic nano-hair mimicking for water strider leg using CF4 plasma treatment on the 2-D and 3-D PTFE patterned surfaces
- Shin, Bong-Su (School of mechanical and aerospace engineering, Seoul National University) ;
- Moon, Myoung-Woon (Convergence Technology Laboratory, Korea Institute of Science and Technology) ;
- Kim, Ho-Young (School of mechanical and aerospace engineering, Seoul National University) ;
- Lee, Kwang-Ryeol (Convergence Technology Laboratory, Korea Institute of Science and Technology)
- Published : 2010.02.17
Abstract
Similar to the superhydrophobic surfaces of lotus leaf, water strider leg is attributed to hierarchical structure of micro pillar and nano-hair coated with low surface energy materials, by which water strider can run and even jump on the water surface. In order to mimick its leg, many effort, especially, on the fabrication of nanohairs has been made using several methods such as a capillarity-driven molding and lithography using poly(urethane acrylate)(PUA). However most of those effort was not so effective to create the similar structure due to its difficulty in the fabrication of nanoscale hairy structures with hydrophobic surface. In this study, we have selected a low surface energy polymeric material of polytetrafluoroethylene (PTFE, or Teflon) assisted with surface modification of CF4 plasma treatment followed by hydrophobic surface coating with pre-cursor of hexamethyldisiloxane (HMDSO) using a plasma enhanced chemical vapor deposition (PE-CVD). It was found that the plasma energy and duration of CF4 treatment on PTFE polymer could control the aspect ratio of nano-hairy structure, which varying with high aspect ratio of more than 20 to 1, or height of over 1000nm but width of 50nm in average. The water contact angle on pristine PTFE surface was measured as approximately
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