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Updated: May 25, 2026

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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Wetting transparency of graphene.

Javad Rafiee1, Xi Mi, Hemtej Gullapalli

  • 1Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

Nature Materials
|January 24, 2012
PubMed
Summary

Graphene coatings maintain the natural wetting behavior of surfaces like copper and silicon. This "wetting transparency" enhances condensation heat transfer by preventing oxidation without altering surface interactions.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Understanding surface wetting is crucial for designing advanced materials.
  • Graphene's unique properties offer potential for novel surface modifications.
  • The impact of graphene coatings on intrinsic surface wettability requires detailed investigation.

Purpose of the Study:

  • To investigate the effect of graphene coatings on the wetting behavior of various surfaces.
  • To determine the conditions under which graphene exhibits wetting transparency.
  • To explore the implications of graphene's wetting transparency on heat transfer applications.

Main Methods:

  • Contact angle measurements on different substrates (copper, gold, silicon, glass) with graphene coatings.

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  • Varying the number of graphene layers to observe changes in wettability.
  • Molecular dynamics simulations and theoretical predictions to understand the mechanisms.
  • Condensation heat transfer measurements on coated copper surfaces.

    • Main Results:

    • Graphene monolayers are wetting-transparent to surfaces dominated by van der Waals forces (copper, gold, silicon).
    • Graphene does not exhibit wetting transparency on glass, where chemical bonding dominates.
    • Wettability on copper transitions to bulk graphite values with approximately six graphene layers.
    • A 30-40% increase in condensation heat transfer was observed on graphene-coated copper due to suppressed oxidation.

    Conclusions:

    • Graphene coatings can preserve the intrinsic wettability of surfaces, particularly those with van der Waals interactions.
    • The extreme thinness of graphene is key to its wetting transparency.
    • Graphene coatings offer a method to enhance surface functionalities, like heat transfer, without compromising wetting properties.
    • This approach has significant potential for developing advanced surface coatings with tailored properties.