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.

Details

Original languageEnglish
Pages (from-to)1100-1106
Number of pages7
JournalSoft Matter
Volume12
Issue number4
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • WETTING PROPERTIES, SURFACES

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