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  11. Mask-enabled Topography Contrast On Aluminum Surfaces

Mask-Enabled Topography Contrast on Aluminum Surfaces

Trevor J Shimokusu1,2, Hemish Thakkar1, Anam Abbas3

  • 1Department of Mechanical Engineering, Rice University, Houston, Texas 77005, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 16, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a scalable method using blade-cut masks to create patterned aluminum surfaces with tunable wettability and emissivity for enhanced liquid transport and thermal management applications.

Area of Science:

  • Materials Science
  • Surface Engineering
  • Nanotechnology

Background:

  • Patterned surfaces with wettability contrast are crucial for advanced liquid transport in electronics thermal management, self-cleaning, and anti-icing.
  • Aluminum (Al) surfaces are widely used in thermal applications, but methods for creating topography-patterned wettability contrast on Al are limited.

Purpose of the Study:

  • To demonstrate an easy and scalable method for creating topography-patterned wettability contrast on aluminum surfaces using blade-cut masking.
  • To quantify the accuracy of topographic pattern resolution, surface roughness, wettability, and thermal emissivity of the patterned Al surfaces.

Main Methods:

  • Utilized blade-cut vinyl mask templates and a commercial lacquer resin as an etch resist.
  • Employed etching processes to create topographic contrast on aluminum surfaces.

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  • Characterized wettability using contact angle goniometry and thermal emissivity using infrared thermography.

    • Main Results:

    • Achieved wettability contrast from <5° to 80° (etched vs. smooth) and 150° to 120° (etched vs. smooth with hydrophobic coating).
    • Demonstrated enhanced droplet shedding on superhydrophobic regions of striped patterned surfaces during condensation.
    • Mapped topography-mediated thermal emissivity contrast, with etched regions at ε ≈ 0.65 and smooth regions at ε ≈ 0.26.

    Conclusions:

    • The blade-cut masking method offers a scalable route to fabricate complex topography-patterned aluminum surfaces with controlled wettability and emissivity.
    • These patterned surfaces show potential for applications in vapor chamber thermal rectification, radiative cooling, and high-temperature phase change processes.