Anisotropic sliding on dual-rail hydrophilic tracks.
Anisotropic sliding on dual-rail hydrophilic tracks.
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DOI：
10.1039/c7lc00028f
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发表时间：
2017-03
期刊：
影响因子：
6.1
通讯作者：
Xiaolong Yang;Jinlong Song;Huanxi Zheng;Xu Deng;Xin Liu;Xiaohong Lu;Jing Sun;Danyang Zhao
中科院分区：
文献类型：
--
作者：
Xiaolong Yang;Jinlong Song;Huanxi Zheng;Xu Deng;Xin Liu;Xiaohong Lu;Jing Sun;Danyang Zhao
具有滑动角各向异性的仿生表面具有定向控制水滴运动的能力，因此在各个领域有着广泛的应用。利用微铣削技术在超疏水铝表面制备了平行窄化的双轨亲水轨道。正交和线性SA各向异性观察和研究的平行和窄DRHT，分别。平行DRHT的轨道间距被设计成调节水滴的正交SA各向异性。实验数据表明，沿轨道的液滴-基底界面宽度，以及滑动各向异性，随着轨道间距的增加而减小。SA对比度（线性SA各向异性）在两个相反的方向沿着的轨道上观察和讨论的变窄DRHT。结果表明，液滴在间距扩展方向的滑动比在收缩方向的滑动更困难，当液滴在DRHT段的末端分配时，由于液滴-轨道界面液体张力的作用，沿轨道向外分离的SA和向内分离的SA也表现出明显的线性各向异性。在讨论的正交和线性SA的基础上，潜在的芯片实验室的智能液滴传输，混合和捕获和释放的应用进行了探索。
Biomimetic surfaces with sliding angle (SA) anisotropy have the capacity to directionally control the motion of water droplets and therefore have wide applications in various domains. Parallel and narrowing dual-rail hydrophilic tracks (DRHTs) are fabricated on etched superhydrophobic Al surfaces using a micromilling technique. Orthogonal and linear SA anisotropies are observed and investigated on the parallel and narrowing DRHTs, respectively. Track spacings of the parallel DRHTs are designed to regulate the orthogonal SA anisotropy of the water droplet. Experimental data shows that the along-track droplet-substrate interfacial widths, together with the sliding anisotropy, decrease with the increase of the track spacings. SA contrast (linear SA anisotropy) in two opposite directions along the tracks is observed and discussed on the narrowing DRHTs. Results indicate that droplets slide with more difficulty in the spacing-expanding direction than those in the shrinking direction, and when a droplet is dispensed at the tail end of a DRHT segment, the along-track outward detaching SAs and inward SAs also show sharp linear anisotropy due to the droplet-track interfacial liquid tension. On the basis of the discussed orthogonal and linear SAs, potential lab-on-a-chip applications for intelligent droplet transport, mixing and capture & release are explored.