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Issue 21, 2014
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How microstructures affect air film dynamics prior to drop impact

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Abstract

When a drop impacts a surface, a dimple can be formed due to the increased air pressure beneath the drop before it wets the surface. We employ a high-speed color interferometry technique to measure the evolution of the air layer profiles under millimeter-sized drops impacting hydrophobic micropatterned surfaces for impact velocities of typically 0.4 m s−1. We account for the impact phenomena and show the influence of the micropillar spacing and height on the air layer profiles. A decrease in pillar spacing increases the height of the air dimple below the impacting drop. Before complete wetting, when the impacting drop only wets the top of the pillars, the air–droplet interface deforms in between the pillars. For large pillar heights the deformation is larger, but the dimple height is hardly influenced.

Graphical abstract: How microstructures affect air film dynamics prior to drop impact

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Publication details

The article was received on 07 Feb 2014, accepted on 14 Mar 2014 and first published on 17 Apr 2014


Article type: Communication
DOI: 10.1039/C4SM00298A
Citation: Soft Matter, 2014,10, 3703-3707
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    How microstructures affect air film dynamics prior to drop impact

    R. C. A. van der Veen, M. H. W. Hendrix, T. Tran, C. Sun, P. A. Tsai and D. Lohse, Soft Matter, 2014, 10, 3703
    DOI: 10.1039/C4SM00298A

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