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Directional imbibition on a chemically patterned silicon micropillar array.

Ville Jokinen1

  • 1School of Chemical Technology, Aalto University, Micronova, Tietotie 3, 02150 Espoo, Finland. ville.p.jokinen@aalto.fi.

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|November 19, 2015
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Summary

Chemically patterned silicon micropillar arrays enable controlled directional fluid imbibition. This study demonstrates unidirectional, bidirectional, and tridirectional wetting behaviors for oils and water.

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Area of Science:

  • Materials Science
  • Surface Science
  • Fluid Dynamics

Background:

  • Anisotropic wetting is crucial for microfluidic devices and lab-on-a-chip technologies.
  • Controlling fluid movement on patterned surfaces remains a challenge.

Purpose of the Study:

  • To demonstrate and analyze directional fluid imbibition on chemically patterned silicon micropillar arrays.
  • To investigate the relationship between surface chemistry patterns and anisotropic wetting behavior.

Main Methods:

  • Fabrication of silicon micropillar arrays with overlaid surface chemistry patterns.
  • Experimental observation of directional imbibition of oils (hexadecane, tetradecane, dodecane) and water.
  • Analysis of meniscus pinning and movement based on the surface free energy landscape.

Main Results:

  • Demonstrated four types of directional imbibition: unidirectional, bidirectional, and tridirectional.
  • Observed anisotropic wetting behavior driven by surface chemistry.
  • Identified pinning and free movement of the advancing meniscus due to the free energy landscape.

Conclusions:

  • Chemically patterned micropillar arrays can precisely control fluid imbibition direction.
  • Surface chemistry design is key to achieving desired anisotropic wetting for various fluidic applications.
  • The study provides design criteria for surfaces exhibiting controlled directional fluid transport.