Large slip of aqueous liquid flow over a nanoengineered superhydrophobic surface - art. no. 066001
Large slip of aqueous liquid flow over a nanoengineered superhydrophobic surface - art. no. 066001
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DOI：
10.1103/physrevlett.96.066001
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发表时间：
2006-02-17
影响因子：
8.6
通讯作者：
Kim, CJ
中科院分区：
文献类型：
--
作者：
Choi, CH;Kim, CJ
虽然最近的许多研究已经证实了液体在某些固体表面上的滑移的存在，但还没有人刻意设计和制造在实际条件下最大化滑移的表面。在这里，我们设计了一个纳米结构的超疏水表面，最大限度地减少了液体-固体接触面积，使液体主要在空气层上流动。通过锥板流变仪系统测量，该表面已经证明了戏剧性的滑移效应：对于水流，滑移长度类似于20 μ m，对于30wt%甘油，滑移长度类似于50 μ m。基本的几何特征在于填充在表面上的纳米柱：高且细长（即，针状）轮廓和亚微米周期性（即，pitch）。
While many recent studies have confirmed the existence of liquid slip over certain solid surfaces, there has not been a deliberate effort to design and fabricate a surface that would maximize the slip under practical conditions. Here, we have engineered a nanostructured superhydrophobic surface that minimizes the liquid-solid contact area so that the liquid flows predominantly over a layer of air. Measured through a cone-and-plate rheometer system, the surface has demonstrated dramatic slip effects: a slip length of similar to 20 mu m for water flow and similar to 50 mu m for 30 wt % glycerin. The essential geometrical characteristics lie with the nanoposts populated on the surface: tall and slender (i.e., needlelike) profile and submicron periodicity (i.e., pitch).