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Study of the liquid flowing behavior through the micro-structure array has aroused the significant interest due to its key roles in the fields of microfluidics, micro-mixers, micro-heat exchangers, tribology, etc. Micro-structure array can significantly affect the liquid flowing characteristics of the near-surface layer and the solid-liquid interfacial properties, like adhesion, surface wetting, shear viscous resistance, interfacial slip, etc. The researches indicate that the stripe- and square-patterned electrodes can improve the storage properties of the lithium-ion battery due to its ability to promote the diffusion of the liquid electrolyte. Micro-structure array patterned micro-channel can reduce the friction drag of liquid flowing through it. And the surface fabricated with lotus-leaf-like dual-scale structure array can achieve the super-hydrophobicity. For a micro-structure array, its influences on the liquid flowing behaviors greatly depend on the shape and size of the micro-structure, and the porosity, arrangement and size of the array. Here, we mainly focus on the influences of the micro-structure shape and surface topography on the liquid flowing behaviors, by adopting the same array porosity, arrangement and size, and the same feature size of the micro-structure. In the present paper, we prepare three different surfaces, which are the micro-pillar array surfaces, micro-hole array surface, and dual-scale micro-pillar array surface (i.e., micro-pillar with rough top surface), respectively. Their influences on the liquid flowing characteristics of the near-surface layer are investigated by quartz crystal microbalance (QCM). The QCM is a powerful and promising technique in studying the solid/liquid interfacial behaviors. Its main output parameters are frequency shift and half-bandwidth variation, which are closely related to the rheological properties and flow characteristics of the near-surface liquid layer. When the QCM chip is patterned with micro-structure array, it will inevitably influence the liquid motion and makes it more complicated, like the generation of non-laminar motion, the trapping of liquid in the gap, and the conversion of the in-plane surface motion into the surface-normal liquid motion. The experimental results show that for the same tested liquid, the frequency shift caused by the micro-hole array is higher than that by the micro-pillar array with the same feature size. And the dual-scale micro-pillar array surface results in a higher half-bandwidth variation than the micro-pillar array surface with the same feature size. It demonstrates that micro-hole tends to confine the liquid motion and make the trapped liquid oscillate with the substrate like a rigid film, thus resulting in a higher frequency shift. The dual-scale micro-structure will render the flow behavior of the near-surface layer more chaotic, thus showing a larger half-bandwidth variation. This study provides an experimental basis for selecting the type of micro-structure used in the microfluidic chip to better control the liquid flowing and mixing.
[1] Darbois Texier B, Laurent P, Stoukatch S, Dorbolo S 2016 Microfluid. Nanofluid 20 53
[2] Yamada T, Hong C, Gregory O J, Faghri M 2011 Microfluid Nanofluid. 11 45
[3] Gu Y, Zhao G, Zheng J, Li Z, Liu W, Muhammad F K 2014 Ocean Eng. 81 50
[4] Lyu S, Nguyen D C, Kim D, Hwang W, Yoon B 2013 Appl. Surf. Sci. 286 206
[5] Jung Y C, Bhushan B 2010 J. Phys. Condens. Matter:Instit. Phys. J. 22 35104
[6] Woolford B, Prince J, Maynes D, Webb B W 2009 Phys. Fluids 21 85106
[7] Ou J, Perot B, Rothstein J P 2004 Phys. Fluids 16 4635
[8] Lee S H, Kim W B 2016 J. Power Sources 307 38
[9] Goullet A, Glasgow I, Aubry N 2006 Mech. Res. Commun. 33 739
[10] Priezjev N V 2011 J. Chem. Phys. 135 204704
[11] Suh M, Chae Y, Kim S, Hinoki T, Kohyama A 2010 Tribol. Int. 43 1508
[12] Mills A, Burns L, Rourke C O, Madsen H 2016 Sol. Energ. Mat. Sol. C 144 78
[13] Rechendorff K, Hovgaard M B, Foss M, Besenbacher F 2007 J. Appl. Phys. 101 114502
[14] Daikhin L, Gileadi E, Katz G, Tsionsky V, Urbakh M, Zagidulin D 2002 Anal. Chem. 74 554
[15] Levi M D, Daikhin L, Aurbach D, Presser V 2016 Electrochem. Commun. 67 16
[16] Daikhin L, Urbakh M 1996 Langmuir 12 6354
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[1] Darbois Texier B, Laurent P, Stoukatch S, Dorbolo S 2016 Microfluid. Nanofluid 20 53
[2] Yamada T, Hong C, Gregory O J, Faghri M 2011 Microfluid Nanofluid. 11 45
[3] Gu Y, Zhao G, Zheng J, Li Z, Liu W, Muhammad F K 2014 Ocean Eng. 81 50
[4] Lyu S, Nguyen D C, Kim D, Hwang W, Yoon B 2013 Appl. Surf. Sci. 286 206
[5] Jung Y C, Bhushan B 2010 J. Phys. Condens. Matter:Instit. Phys. J. 22 35104
[6] Woolford B, Prince J, Maynes D, Webb B W 2009 Phys. Fluids 21 85106
[7] Ou J, Perot B, Rothstein J P 2004 Phys. Fluids 16 4635
[8] Lee S H, Kim W B 2016 J. Power Sources 307 38
[9] Goullet A, Glasgow I, Aubry N 2006 Mech. Res. Commun. 33 739
[10] Priezjev N V 2011 J. Chem. Phys. 135 204704
[11] Suh M, Chae Y, Kim S, Hinoki T, Kohyama A 2010 Tribol. Int. 43 1508
[12] Mills A, Burns L, Rourke C O, Madsen H 2016 Sol. Energ. Mat. Sol. C 144 78
[13] Rechendorff K, Hovgaard M B, Foss M, Besenbacher F 2007 J. Appl. Phys. 101 114502
[14] Daikhin L, Gileadi E, Katz G, Tsionsky V, Urbakh M, Zagidulin D 2002 Anal. Chem. 74 554
[15] Levi M D, Daikhin L, Aurbach D, Presser V 2016 Electrochem. Commun. 67 16
[16] Daikhin L, Urbakh M 1996 Langmuir 12 6354
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