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Controlling Liquid Spreading Using Microfabricated Undercut Edges

Authors

  • Ville Liimatainen,

    1. Department of Automation and Systems Technology, School of Electrical Engineering, Aalto University, Otaniementie 17, Espoo 02150, Finland
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  • Veikko Sariola,

    1. Department of Automation and Systems Technology, School of Electrical Engineering, Aalto University, Otaniementie 17, Espoo 02150, Finland
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  • Quan Zhou

    Corresponding author
    1. Department of Automation and Systems Technology, School of Electrical Engineering, Aalto University, Otaniementie 17, Espoo 02150, Finland
    • Department of Automation and Systems Technology, School of Electrical Engineering, Aalto University, Otaniementie 17, Espoo 02150, Finland.
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Abstract

A purely topographical method for controlling liquid spreading by using easy-to-fabricate undercut edges is reported. By periodic repetition of such edges, it is shown that multiple droplets can be patterned in well-controlled shapes, and highly anisotropic wetting can also be achieved at a large scale. Apparent contact angles close to 180° at the edge are shown, even for low surface tension liquids.

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