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Directional step flow across ridges on multiscale two-face prism array

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Abstract

Directional wetting or spreading on asymmetric structures have received much attention because of their potential to control the liquid flow in microfluidic devices. Although there have been many reports on directional liquid flows, the flow speeds of the directional flows could not be predicted. Here, we present a controllable strategy for directional flow on a multiscale two-face prism array, one face is smooth and the other face is roughened. The polymeric surface of the prism is roughened by oxygen plasma while the other side is blocked by a coated metal film. With the designed structure, we demonstrate a unidirectional liquid flow and manipulate the flow speed in an open channel. From a simplified model suggested here, the flow speed could be predicted quantitatively.

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, Seoul National University of Science & Technology, Seoul, 139-743, Korea

    Hyunsik Yoon

  2. School of Chemical and Biological Engineering, The National Initiative Creative Research Center for Intelligent Hybrids, The WCU Program for Chemical Convergence for Energy and Environment, Seoul National University, Seoul, 151-744, Korea

    Seung Hyun Sung, Jai Hyun Koh & Kookheon Char

  3. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-744, Korea

    Sang Moon Kim & Kahp Y. Suh

  4. MCNet Co., Ltd., Room 307-1 Building 103 SK Ventium, Dangjeong-dong, Gunpo-si, Gyeonggi, 435-833, Korea

    Se-Jin Choi

Authors
  1. Hyunsik Yoon
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  2. Seung Hyun Sung
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  3. Jai Hyun Koh
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  4. Sang Moon Kim
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  5. Se-Jin Choi
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  6. Kahp Y. Suh
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  7. Kookheon Char
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Corresponding authors

Correspondence to Hyunsik Yoon or Kookheon Char.

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Yoon, H., Sung, S.H., Koh, J.H. et al. Directional step flow across ridges on multiscale two-face prism array. Macromol. Res. 23, 145–148 (2015). https://doi.org/10.1007/s13233-015-3026-0

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  • DOI: https://doi.org/10.1007/s13233-015-3026-0

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