Superhydrophobic and lipophobic properties of self-organized honeycomb and pincushion structures

H Yabu, M Takebayashi, M Tanaka, M Shimomura - Langmuir, 2005 - ACS Publications
H Yabu, M Takebayashi, M Tanaka, M Shimomura
Langmuir, 2005ACS Publications
This report describes the simple preparation of superhydrophobic and lipophobic surfaces
by self-organization. Microporous polymer films of a fluorinated polymer with hexagonally
arranged pores were prepared by casting from solution under humid conditions.
Hexagonally packed water microdroplets were formed by evaporative cooling on the surface
of the casting solution. After solvent evaporation, a honeycomb-patterned polymer film was
formed with the water droplet array acting as a template; the water droplets themselves …
This report describes the simple preparation of superhydrophobic and lipophobic surfaces by self-organization. Microporous polymer films of a fluorinated polymer with hexagonally arranged pores were prepared by casting from solution under humid conditions. Hexagonally packed water microdroplets were formed by evaporative cooling on the surface of the casting solution. After solvent evaporation, a honeycomb-patterned polymer film was formed with the water droplet array acting as a template; the water droplets themselves evaporated soon after the solvent. Two porous polymer layers were stacked vertically, separated by pillars at the hexagon vertexes. After peeling off the top layer using adhesive tape, a pincushion-like structure was obtained. Here, we show that superhydrophobic behavior was achieved, with the maximum contact angle, 170°, observed using these pincushion structures. Theoretical calculations fit the experimental results well. The lipophobic properties of the films are also discussed.
ACS Publications
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