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Issue 4, 2016
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Directional imbibition on a chemically patterned silicon micropillar array

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Abstract

Directional imbibition of oils (hexadecane, tetradecane, and dodecane) and water is demonstrated on a chemically patterned silicon micropillar array. Four different directional imbibition types are shown: unidirectional, two types of bidirectional and tridirectional imbibition. The surfaces consist of a silicon micropillar array with an overlaid surface chemistry pattern. This configuration leads to anisotropic wetting behaviour into various directions of the advancing meniscus. Due to the free energy landscape obtained, the advancing meniscus gets pinned in some directions (determined by the surface chemistry pattern) while it is free to move to the remaining directions. The conditions for directional imbibition and design criteria for the surfaces are derived and discussed.

Graphical abstract: Directional imbibition on a chemically patterned silicon micropillar array

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Publication details

The article was received on 15 Jul 2015, accepted on 04 Nov 2015 and first published on 18 Nov 2015


Article type: Paper
DOI: 10.1039/C5SM01746G
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Soft Matter, 2016,12, 1100-1106
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    Directional imbibition on a chemically patterned silicon micropillar array

    V. Jokinen, Soft Matter, 2016, 12, 1100
    DOI: 10.1039/C5SM01746G

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