Sliding of water droplets on smooth hydrophobic silane coatings with regular triangle hydrophilic regions.
Sliding of water droplets on smooth hydrophobic silane coatings with regular triangle hydrophilic regions.
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DOI：
10.1021/la401517v
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
A. Nakajima;Yosuke Nakagawa;T. Furuta;M. Sakai;T. Isobe;S. Matsushita
中科院分区：
文献类型：
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作者：
A. Nakajima;Yosuke Nakagawa;T. Furuta;M. Sakai;T. Isobe;S. Matsushita
研究了三角形钉扎区对水滴在光滑疏水表面上滑动的影响。采用光刻法和十八烷基三甲氧基硅烷（ODS）制备了具有不同正三角形亲水区域的光滑疏水硅烷涂层。表面中的亲水区域以恒定的面积分数呈六边形排列。因此，涂层的水接触角几乎相等。水滴的滑动速度随着图案尺寸的增大而不断增大。在表面上观察到各向异性的滑动速度，表明不同的钉扎效应。随着亲水区尺寸的变化，水滴在梯度表面上的滑动运动会发生反向偏转。偏转长度取决于三角形亲水区的方向和初始滑动位置。这些结果表明，通过设计化学不均匀性的形状和排列，在保持静态接触角的同时控制滑动速度是可行的。
The effect of the triangular pinning region on the sliding of water droplets on the smooth hydrophobic surface was investigated. Smooth hydrophobic silane coatings with various regular triangle hydrophilic regions were prepared using photolithography and octadecyltrimethoxysilane (ODS). The hydrophilic area in the surfaces was aligned hexagonally with a constant area fraction. Thereby water contact angles of the coatings were almost equivalent. The water droplet sliding velocity increased continuously with increasing pattern size. Anisotropic sliding velocity was observed on the surface, suggesting different pinning effects. The sliding motion of water droplets on the gradient surface with changing hydrophilic region size deflects against the downward direction. The deflection length depends on the direction of triangle hydrophilic regions and the initial sliding position. These results demonstrate that control of the sliding velocity while sustaining the static contact angle is feasible by designing the shape and alignment of chemical heterogeneity.