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Antireflective Transparent Oleophobic Surfaces by Noninteracting Cavities.

Juan Rombaut1, Rinu Abraham Maniyara1, Robert A Bellman2

  • 1ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology , Castelldefels, 08860 Barcelona , Spain.

ACS Applied Materials & Interfaces
|November 17, 2018
PubMed
Summary

Researchers developed novel oleophobic surfaces using simple noninteracting cavities, enhancing oil and water repellency. These durable, transparent surfaces offer promising applications for self-cleaning windows and coatings.

Keywords:
antireflectivecavitiesmicro-nano manufacturingnanostructured optical surfacesoleophobicself-cleaningsurface wettingtransparent surface

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Traditional oleophobic surfaces often require complex micro/nanoscale re-entrant geometries.
  • Achieving both oleophobicity and optical transparency can be challenging.

Purpose of the Study:

  • To propose and demonstrate a new design for oleophobic surfaces using noninteracting cavities.
  • To achieve high oil and water repellency with enhanced optical transparency and mechanical durability.

Main Methods:

  • Fabrication of oleophobic surfaces with microholes in silicon and nanoholes in glass.
  • Characterization of wetting properties using contact angle measurements for oleic acid and hexadecane.
  • Evaluation of optical transparency and mechanical durability using spectrophotometry and crockmeter tests.

Main Results:

  • Demonstrated oleophobic surfaces with contact angles of ~130° for oleic acid and ~110° for hexadecane.
  • Achieved high optical transparency in nanohole surfaces, exceeding that of bare glass substrates.
  • Confirmed excellent mechanical durability with over 500 crockmeter passes without property degradation.

Conclusions:

  • The proposed noninteracting cavity design offers a simpler route to highly effective oleophobic surfaces.
  • These surfaces exhibit a unique combination of oleophobicity, optical transparency, and mechanical robustness.
  • Potential applications include self-cleaning transparent coatings for windows, automotive, and aerospace industries.