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Anisotropic wetting on tunable micro-wrinkled surfaces.

Jun Young Chung1, Jeffrey P Youngblood2, Christopher M Stafford1

  • 1Polymers Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA. chris.stafford@nist.gov.

Soft Matter
|September 9, 2020
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Summary

We studied liquid wetting on rough surfaces using wrinkling instability. Droplet wetting direction on these surfaces is mainly controlled by the roughness aspect ratio, offering new insights into contact angle measurements.

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Area of Science:

  • Surface science
  • Materials science
  • Physics

Background:

  • Understanding liquid behavior on rough surfaces is crucial for various applications.
  • Interpreting contact angle measurements on textured surfaces can be challenging.
  • Existing models may not fully capture wetting phenomena on anisotropic rough topographies.

Purpose of the Study:

  • To investigate the wettability of anisotropic micro-wrinkled surfaces.
  • To establish a relationship between surface topography and droplet wetting behavior.
  • To provide a more accurate interpretation of contact angle measurements on rough surfaces.

Main Methods:

  • Utilizing a wrinkling instability to create model substrate topographies with tunable aspect ratios.
  • Probing the wetting of liquids on these anisotropic micro-wrinkled features.
  • Comparing experimental measurements with theoretical models.

Main Results:

  • Droplet wetting anisotropy on rough surfaces is primarily governed by the roughness aspect ratio.
  • The aspect ratio (amplitude/wavelength) of micro-wrinkles dictates wetting direction.
  • Observed contact angles and droplet distortions are quantitatively linked to energy barriers.

Conclusions:

  • The study provides novel insights into liquid wetting on rough surfaces.
  • Surface roughness aspect ratio is a key determinant of wetting anisotropy.
  • Theoretical models can accurately explain contact angle variations based on energy barriers.