Sliding of Water Droplets on Hydrophobic Surfaces with Various Hydrophilic Region Sizes

被引:44
|
作者
Furuta, Tsutomu [1 ]
Sakai, Munetoshi [2 ]
Isobe, Toshihiro [1 ]
Matsushita, Sachiko [1 ]
Nakajima, Akira [1 ,2 ]
机构
[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Grad Sch Sci & Engn, Meguro Ku, Tokyo 1528552, Japan
[2] Kanagawa Acad Sci & Technol, Takatsu Ku, Kawasaki, Kanagawa 2130012, Japan
关键词
CONTACT-ANGLE HYSTERESIS; CHEMICALLY PATTERNED SURFACES; FLUOROALKYLSILANE COATINGS; MONOLAYERS; BEHAVIOR; DROPS; ROUGHNESS; DYNAMICS; SLIP;
D O I
10.1021/la200396v
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:7307 / 7313
页数:7
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