论文标题
润滑性化学异质表面上水滴的各向异性棒状滑移行为
Anisotropic Stick-Slip Behavior of Aqueous Drops on Lubricated Chemically Heterogeneous Slippery Surfaces
论文作者
论文摘要
常规的滑动表面在各个方向上显示各向同性的下降迁移率，但是许多应用仅需要沿特定路径的方向降落运动。在先前的研究中，研究人员使用了地形底物以及不同的外部刺激，以证明各向异性下降运动，这不是非常有效且具有成本效益。在本文中，我们报告了一种新的方法，用于智能控制掉落运动，以润滑流体涂层的化学异质表面，该表面由交替的疏水和亲水条纹组成。将水滴沉积在这样的表面上后，从亲水区域的润滑液露水下方仍在疏水性区域保持完整，为滴提供了粘性和湿滑的区域。这导致了显着的各向异性下降滑动行为，从平行于条纹的均匀运动到沿着它们的垂直线运动。此外，我们还展示了一个相图，总结了滴，粘贴或沿一个或两个方向移动的不同动态情况。
Conventional slippery surfaces show isotropic drop mobility in all directions, but many applications require directional drop motion along a particular path only. In previous studies, researchers used topographic substrates, together with different external stimuli, to demonstrate anisotropic drop motion, which is not very efficient and cost-effective. Herein, we report a novel approach to smartly control drop motion on lubricating fluid coated chemically heterogeneous surfaces composed of alternating hydrophobic and hydrophilic stripes. Upon depositing an aqueous drop on such a surface, the underneath lubricating fluid dewets from the hydrophilic regions but remains intact on the hydrophobic ones, providing sticky and slippery areas for the drop. This results in remarkable anisotropic drop sliding behavior, from uniform motion along parallel to stripes to stick-slip motion along the perpendicular to them. Furthermore, we also demonstrate a phase diagram summarizing different dynamic situations exhibited by drops, sticking, or moving in one or both directions.
