Liquid transport with direction guidance and speed enhancement from gradient and magnetized micro-cilia surface

联轴节(管道) 润湿 纤毛 流体学 各向异性 材料科学 液晶 磁场 纳米技术 曲面(拓扑) 化学物理 物理 光学 光电子学 航空航天工程 复合材料 几何学 生物 数学 量子力学 工程类 细胞生物学
作者
Guang Liu,Liwen Zhang,Yang Gan,Yan Wang,Dengke Chen,Yuguo Dai,Lin Feng,Pengfei Zhang,Huawei Chen
出处
期刊:Applied Physics Letters [American Institute of Physics]
卷期号:120 (19) 被引量:15
标识
DOI:10.1063/5.0089149
摘要

Liquid transport regulation has attracted wide attention recently due to its potential applications in micro-fluidic devices, heat management, and mechanical engineering. Various liquid regulation strategies for direction guiding and speed enhancing have been developed with inspirations from nature, such as desert beetles and Nepenthes alata peristome with either gradient wettability or anisotropic structures, whereas their combined strategies for enhanced liquid regulations have barely been discussed due to the unclear coupling mechanisms. Herein, inspired by liquid transporting structure on Ligia exotica's leg, a smart flexible surface with gradient distributed and magnetized micro-cilia array is proposed to realize liquid spreading regulations in speed and direction. Different gradients and magnetic fields have been compared for liquid regulating performances, where the anisotropy ratio of liquid spreading could be enhanced from 0 on uniform surface to ∼0.3 on gradients surface, to even ∼0.6 by coupling magnetic field. The underlying liquid regulating mechanism has been established based on the mutual effects of liquid pinning and capillarity at different cilium inclined angles, cilium gap distance, and surface wettability. Finally, several liquid regulation applications are explored and offer potentials for fields of medicine and heat management.
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