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

Hyunsik Yoon; Seung Hyun Sung; Jai Hyun Koh; Sang Moon Kim; Se-Jin Choi; Kahp Y. Suh; Kookheon Char

Macromolecular Research, Vol.23, No.2, 145-148, February, 2015

DOI10.1007/s13233-015-3026-0 Export Citation

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

Hyunsik Yoon^†, Seung Hyun Sung¹, Jai Hyun Koh¹, Sang Moon Kim², Se-Jin Choi³, Kahp Y. Suh², and Kookheon Char^{1, †}

Department of Chemical and Biomolecular Engineering, Seoul National University of Science & Technology, Seoul, 139-743, Korea
¹School 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
²School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-744, Korea
³MCNet Co., Ltd., Room 307-1 Building 103 SK Ventium, Dangjeong-dong, Gunpo-si, Gyeonggi, 435-833, Korea

E-mail:,

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.

Keywords:prism;directional flow;polymer;microfluidics;contact angle

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Oliver J, Huh C, Mason S, J. Colloid Interface Sci., 59, 568 (1977)
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[Related Articles]

[1] Chu KH, Xiao R, Wang EN, Nat. Mater., 9(5), 413 (2010)

[2] Kim TI, Suh KY, Soft Matter, 5, 4131 (2009)

[3] Malvadkar NA, Hancock MJ, Sekeroglu K, Dressick WJ, Demirel MC, Nat. Mater., 9(12), 1023 (2010)

[4] Daniel S, Sircar S, Gliem J, Chaudhury MK, Langmuir, 20(10), 4085 (2004)

[5] Zheng Y, Bai H, Huang Z, Tian X, Nie FQ, Zhao Y, Zhai J, Jiang L, Nature, 463, 640 (2010)

[6] Prakash M, Quere D, Bush JW, Science, 320, 931 (2008)

[7] Kim SM, Kang DH, Koh JH, Suh HS, Yoon H, Suh KY, Char K, Soft Matter, 9, 4145 (2013)

[8] Choi SJ, Choi MK, Tahk D, Yoon H, J. Mater. Chem., 21, 14936 (2011)

[9] Yoon H, Oh SG, Kang DS, Park JM, Choi SJ, Suh KY, Char K, Lee HH, Nat. Commun., 2, 455 (2011)

[10] Yoon H, Jeong HE, Kim TI, Kang TJ, Tahk D, Char K, Suh KY, Nano Today, 4(5), 385 (2009)

[11] Choi Y, Hong S, Lee LP, Nano Lett., 9, 3726 (2009)

[12] Oliver J, Huh C, Mason S, J. Colloid Interface Sci., 59, 568 (1977)

[13] Chang FM, Hong SJ, Sheng YJ, Tsao HK, J. Phys. Chem. C, 114, 1615 (2010)

[14] Quere D, Annu. Rev. Mater. Res., 38, 71 (2008)

[15] Verplanck N, Coffinier Y, Thomy V, Boukherroub R, Nanoscale Res. Lett., 2, 577 (2007)

[16] Ueda E, Levkin PA, Adv. Mater., 25(9), 1234 (2013)

[17] Nishimoto S, Bhushan B, R. Soc. Chem. Adv., 3, 671 (2013)