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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
Published on: February 11, 2020
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Water wettability dependence on surface structure of a snail shell
Ryota Yamagishi1, Hirotaka Maeda, Toshihiro Kasuga
1Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
Bioinspiration & Biomimetics
|February 8, 2020
Summary
Snail shell surface structures with specific roughness enhance water droplet spreading. This study reveals how varying micro- and nano-scale textures influence wettability and dynamic behaviors, offering insights into surface engineering.
Area of Science:
- Materials Science
- Surface Science
- Biomimetics
Background:
- Hierarchical surface structures in nature exhibit unique wettability properties.
- Snail shells display distinct wetting behaviors influenced by their surface roughness at scales of 10, 100, and 500 µm.
Purpose of the Study:
- To investigate the influence of varied surface roughness on water wettability using snail shells.
- To elucidate the mechanism behind dynamic wetting behavior through simulation.
Main Methods:
- Evaluation of water droplet wettability on natural snail shell surfaces with different roughness.
- Simulation of snail shell surface structures using epoxy resins to model wetting dynamics.
- Measurement of contact angle and droplet base diameter over time.
Main Results:
- Snail shell surfaces with three specific roughness types (10, 100, 500 µm) demonstrated superior water droplet spreading compared to other combinations.
- Epoxy resin simulations showed that surfaces with three roughness types transitioned from hydrophobic to hydrophilic, with increased droplet spreading.
- Specific roughness combinations (e.g., 100 and 500 µm) resulted in minimal changes in contact angle and droplet base diameter.
Conclusions:
- The presence of multiple roughness scales on snail shell surfaces significantly promotes water droplet spreading.
- The 10 µm roughness parameter plays a crucial role in influencing dynamic contact angles.
- Understanding these structure-wettability relationships can inform the design of advanced functional surfaces.
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