Sliding of water droplets on hydrophobic surfaces with various hydrophilic region sizes.
Sliding of water droplets on hydrophobic surfaces with various hydrophilic region sizes.
复制标题
DOI：
10.1021/la200396v
复制
发表时间：
2011-04
期刊：
影响因子：
--
通讯作者：
T. Furuta;M. Sakai;T. Isobe;S. Matsushita;A. Nakajima
中科院分区：
文献类型：
--
作者：
T. Furuta;M. Sakai;T. Isobe;S. Matsushita;A. Nakajima
采用光滑的十八烷基三甲氧基硅烷（ODS）疏水涂层光刻技术制备了四个具有不同大小亲水性区域的图案表面。表面的亲水区以恒定的面积分数呈六边形排列。水滴的滑动角和接触角迟滞随图案尺寸的增大而增大。后退侧缺陷间接触线畸变的增加在这一趋势中起着重要作用。随着图案尺寸的增大，液滴的滑动速度也随之增大。用一个简单的流动模型模拟了这一趋势。根据这一趋势推断出ODS区和亲水区界面的贡献。本研究证明了在液滴下滑的临界时刻和液滴滑动的周期之间，化学表面缺陷对滑动行为的不同大小依赖关系。
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.