Unidirectional wetting and spreading on stooped polymer nanohairs
Unidirectional wetting and spreading on stooped polymer nanohairs
复制标题
DOI：
10.1039/b915079j
复制
发表时间：
2009-01-01
期刊：
影响因子：
3.4
通讯作者：
Suh, Kahp Y.
中科院分区：
文献类型：
--
作者：
Kim, Tae-il;Suh, Kahp Y.
本文报道了通过复型成型和斜向电子束辐照制备的弯曲聚合物纳米毛发上水滴的单向润湿和铺展。当一个液滴被放置在具有高纵横比(AR类似于10)的方向弯曲的纳米毛发的表面上时，它沿着弯曲的方向以单向的方式湿润并自发地在表面上扩散，其中一条边被钉在衬底上。为了评价这种各向异性润湿特性，在通道连接后，用注射器泵测量了简单的Y形微通道内液体沿弯曲方向和逆弯曲方向的速度。研究发现，沿弯曲方向的速度比沿弯曲方向的速度快约6倍，这表明这一简单的策略将在微流体和其他涉及单向液体操纵的应用中得到应用。
We report on unidirectional wetting and spreading of a water droplet on stooped polymer nanohairs fabricated by replica molding and oblique electron beam irradiation. When a droplet is placed on the surface with high aspect-ratio (AR similar to 10) directionally bent nanohairs, it wets and spontaneously spreads over the surface in a unidirectional manner along the stooped direction with one edge being pinned to the substrate. To evaluate such anisotropic wetting property, the liquid velocity is measured along and against the stooped direction inside a simple Y-shaped microchannel with a syringe pump after channel bonding. It is found that the velocity is about six times faster along the stooped direction than that against the stooped direction, suggesting that this simple strategy would find uses in microfluidics and other applications involving unidirectional liquid manipulation.