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Complex pattern formation by adhesion-controlled anisotropic wrinkling.

Pil J Yoo1, Hong H Lee

  • 1Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 14, 2008
PubMed
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Researchers achieved complex surface patterns by heating a metal-polymer bilayer under a poly(dimethylsiloxane) mold. Wrinkle shapes, including convex and concave patterns, were controlled by adjusting adhesion forces and material properties.

Area of Science:

  • Materials Science
  • Surface Engineering
  • Nanotechnology

Background:

  • Confinement-induced wrinkling is a phenomenon observed in thin films under specific conditions.
  • Controlling surface topography at the micro- and nanoscale is crucial for advanced applications.

Purpose of the Study:

  • To investigate complex pattern formation in confinement-induced wrinkling.
  • To demonstrate shape control of wrinkled surfaces by manipulating interfacial properties.

Main Methods:

  • Utilizing a bilayer system of metal and polymer (poly(dimethylsiloxane) - PDMS).
  • Applying heat to induce wrinkling under a patterned PDMS mold.
  • Modulating the work of adhesion at the mold-metal interface.

Main Results:

Related Experiment Videos

  • Observed self-organization of wrinkles into complex structures distinct from the mold pattern.
  • Demonstrated shape inversion of wrinkles (convex to concave) by altering the work of adhesion.
  • Identified the ratio of mold period to intrinsic wrinkling wavelength as a key shape determinant.

Conclusions:

  • Complex surface patterns can be generated through controlled wrinkling.
  • Surface topography, specifically wrinkle shape, can be precisely tuned by managing interfacial adhesion.
  • This technique offers potential for creating tailored surfaces for electro-optics and microfluidics.