Journal
LANGMUIR
Volume 27, Issue 11, Pages 7307-7313Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la200396v
Keywords
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Funding
- JSPS [H22-8538]
- Grants-in-Aid for Scientific Research [21750024, 21360317, 10J08538] Funding Source: KAKEN
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Four patterned surfaces with hydrophilic areas of different sizes were prepared using photolithography with a smooth octadecyltrimethoxysilane (ODS) hydrophobic coating. The hydrophilic area in the surfaces was aligned hexagonally with a constant area fraction. The sliding angle and contact angle hysteresis of the water droplets increased concomitantly with increasing pattern size. The increase of the contact line distortion between defects at the receding side plays an important role in this trend. The droplet sliding velocity also increased concomitantly with increasing pattern size. This trend was simulated by a simple flow model. The contribution of the interface between the ODS region and the hydrophilic area was deduced from this trend. This study demonstrated the different size dependency of the chemical surface defects for sliding behavior between the critical moment at which a droplet slides down and the period when a droplet is sliding.
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