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Superhydrophobic surfaces from hierarchically structured wrinkled polymers.

Yinyong Li1, Shuxi Dai, Jacob John

  • 1Department of Polymer Science and Engineering, University of Massachusetts , 120 Governors Drive, Amherst, Massachusetts 01003-9263, United States.

ACS Applied Materials & Interfaces
|October 18, 2013
PubMed
Summary

Researchers created superhydrophobic wrinkled surfaces with nanoscale and microscale hierarchical structures. These surfaces exhibit tunable wetting properties and enhanced water repellency due to controlled wrinkling patterns.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Superhydrophobic surfaces mimic natural water-repellent phenomena.
  • Controlling surface topography is key to achieving desired wetting properties.
  • Hierarchical structures offer enhanced performance over single-scale features.

Purpose of the Study:

  • To fabricate and characterize superhydrophobic wrinkled surfaces with hierarchical structures.
  • To investigate the effect of hierarchical structures on surface wettability and water repellency.
  • To explore the tunability of wetting behavior by controlling surface morphology.

Main Methods:

  • Fabrication of nanoscale line gratings using nanoimprint lithography on poly(hydroxyethyl methacrylate) films.
  • Generation of micro-scale wrinkled structures through spontaneous wrinkling, influenced by pre-imprinted patterns.
  • Characterization of surface topography and measurement of water contact angles and sliding angles.

Main Results:

  • Hierarchical wrinkled surfaces achieved superhydrophobicity with water contact angles >160° and sliding angles <5°.
  • Confinement effects from nanoscale gratings induced orientation in micro-scale wrinkles.
  • Tunable wettability was demonstrated, ranging from hydrophobic to superhydrophobic.
  • Anisotropic to isotropic wetting transitions were observed by altering initial film thickness.

Conclusions:

  • Hierarchical wrinkled surfaces offer superior water repellency compared to randomly wrinkled surfaces.
  • Controlled wrinkling via nanoimprint lithography enables tailored surface properties.
  • The developed surfaces show potential for applications requiring advanced water management and anti-fouling properties.