Abstract
The effect of small bumps on the state of water droplets was investigated experimentally on the hydrophobic surfaces of pillars with a controlled size. The bump-introduced pillar surfaces were fabricated by the UV-imprinting technique on the SiO2 nanoparticle/resin composite and the partial removal of the resin by O2 etching. Water droplets showed a large contact angle on the pillar surfaces with the bumps. However, on the pillar surfaces without the bumps, the contact angle decreased with the increase in the distance between pillars. These results clearly indicate that the bumps stabilize hydrophobicity on the pillar surface.
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