Three-dimensional capillary ratchet-induced liquid directional steering
Three-dimensional capillary ratchet-induced liquid directional steering
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DOI：
10.1126/science.abg7552
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发表时间：
2021-09-17
期刊：
影响因子：
56.9
通讯作者：
Wang, Zuankai
中科院分区：
文献类型：
--
作者：
Feng, Shile;Zhu, Pingan;Wang, Zuankai
传统的理解是，沉积在表面上的液体倾向于沿着降低表面能的方向沿着移动，表面能主要由表面性质而不是液体性质（例如表面张力）决定。实现良好控制的定向转向仍然具有挑战性，因为液-固相互作用主要发生在二维（2D）域中。我们表明，具有不同表面张力的液体的传播方向可以通过设计3D毛细管棘轮来定制，该棘轮在表面平面内外创建不对称和3D传播轮廓。这种定向转向还伴随着自推进和高流速，所有这些在液体输送中都是优选的。
Conventional understanding has it that a liquid deposited on a surface tends to move along directions that reduce surface energy, which is mainly dictated by surface properties rather than liquid properties, such as surface tension. Achieving well-controlled directional steering remains challenging because the liquid-solid interaction mainly occurs in the two-dimensional (2D) domain. We show that the spreading direction of liquids with different surface tensions can be tailored by designing 3D capillary ratchets that create an asymmetric and 3D spreading profile both in and out of the surface plane. Such directional steering is also accompanied by self-propulsion and high flow velocity, all of which are preferred in liquid transport.