Superhydrophobic nano-hair mimicking for water strider leg using CF4 plasma treatment on the 2-D and 3-D PTFE patterned surfaces
- Superhydrophobic nano-hair mimicking for water strider leg using CF4 plasma treatment on the 2-D and 3-D PTFE patterned surfaces
- 신봉수; 문명운; 김호영; 이광렬
- plasma; PTFE; nano-hair; biomimetic; CF4 plasma; water strider; superhydrophobicity
- Issue Date
- Twelfth International Conference on Plasma Surface Engineering(PSE2010)
- 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-hair structure, which
varying with high aspect ratio of more than 20 to 1 and 50 to 1 on 3-D
substrate(stainless steel wire), or height of over 1000nm but width of 50nm in average.
The water contact angle on pristine PTFE surface was measured as approximately
115°. With nanostructures by CF4 plasma treatment and hydrophobic coating of
HMDSO film, we made a superhydrophobic nano-hair structure with the wetting angle
of over 160°. This novel fabrication method of nano-hair structures has been applied
not only on 2-D flat substrate but also on 3-D substrates like wire and cylinder, which is
similarly mimicked the water strider's leg.
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