Effects of the Surface Roughness on Sliding Angles of Water Droplets on Superhydrophobic Surfaces

  title={Effects of the Surface Roughness on Sliding Angles of Water Droplets on Superhydrophobic Surfaces},
  author={Masashi Miwa and Akira Nakajima and Akira Fujishima and † and Kazuhito Hashimoto and Toshiya Watanabe},
Various superhydrophobic films having different surface roughnesses were prepared, and the relationships between the sliding angle, the contact angle, and the surface structure were investigated. In the highly hydrophobic region, the sliding angles of water droplets decreased with increasing contact angles. Microstructural observation revealed that surface structures that can trap air are important for the preparation of low-sliding-angle surfaces. We have also derived an equation that… 
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