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Crack-Free, Soft Wrinkles Enable Switchable Anisotropic Wetting.

Dongjoon Rhee1, Won-Kyu Lee1, Teri W Odom1,2

  • 1Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA.

Angewandte Chemie (International Ed. in English)
|April 29, 2017
PubMed
Summary

Soft skin layers on elastomeric substrates create crack-free, mechano-responsive wrinkle patterns. This breakthrough enables dynamic control over surface topography and anisotropic wetting for advanced material applications.

Keywords:
mechano-responsive patternsplasma chemistrypolymerssoft matterswitchable wetting

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Soft Matter Physics

Background:

  • Conventional methods for creating surface wrinkles on elastomeric substrates often lead to cracking under strain.
  • Achieving stable, repeatable wrinkle patterns without structural failure is crucial for advanced material applications.

Purpose of the Study:

  • To demonstrate crack-free surface wrinkling on elastomeric substrates using soft skin layers.
  • To investigate the influence of soft skin layers on wrinkle topography and stability under tensile strain.
  • To explore the application of these crack-free wrinkled surfaces in controlling wetting behavior.

Main Methods:

  • Fabrication of soft fluoropolymer skin layers on pre-strained poly(dimethylsiloxane) (PDMS) substrates.
  • Systematic characterization of wrinkle evolution (wavelength, amplitude, orientation) under varying tensile strain.
  • Comparative analysis of soft versus stiff skin layers under cyclic stretching and releasing.
  • Evaluation of water spreading behavior on the wrinkled surfaces.

Main Results:

  • Soft fluoropolymer skin layers on PDMS enabled crack-free surface wrinkling even at high strain regimes.
  • Dynamic control over wrinkle topography was achieved without cracks or delamination, unlike conventional stiff skin layers.
  • The evolution of wrinkle characteristics was systematically mapped as a function of tensile strain.
  • Switchable, anisotropic wetting was realized by guiding water spreading along wrinkle orientation.

Conclusions:

  • Soft skin layers are effective in preventing crack formation during surface wrinkling on elastomeric substrates.
  • This approach offers a robust method for creating stable, tunable wrinkled surfaces with potential for advanced functionalities.
  • The demonstrated control over anisotropic wetting opens possibilities for applications in microfluidics and surface engineering.