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Direct Laser Interference Patterning for Wettability Modification and Bubble Nucleation on Conventional and

Julian Heinrich1,2, Fabian Ränke3, Karin Schwarzenberger1,2

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Summary
This summary is machine-generated.

Surface roughness and laser patterning significantly impact wettability and gas interactions on additively manufactured (AM) substrates. Optimized surface properties enhance gas nucleation, crucial for various applications.

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Area of Science:

  • Materials Science
  • Surface Science
  • Tribology

Background:

  • Surface roughness is critical for wettability and solid-gas interactions, alongside surface chemistry.
  • Additive manufacturing (AM) yields substrates with distinct roughness and porosity compared to conventional methods.
  • Understanding these surface characteristics is vital for controlling interfacial phenomena.

Purpose of the Study:

  • To compare wettability and solid-gas interactions of conventionally manufactured and AM substrates.
  • To investigate the effects of direct laser interference patterning on surface topography and chemistry.
  • To correlate wetting states with bubble nucleation dynamics in O2-oversaturated solutions.

Main Methods:

  • Characterization of surface morphology and topography using confocal microscopy and scanning electron microscopy.
  • Evaluation of wettability after storage in ambient air and aqueous environments.
  • Investigation of bubble dynamics on various surface treatments.

Main Results:

  • AM substrates exhibit enhanced gas nucleation due to increased surface area and Harvey nuclei.
  • Laser patterning increases surface area, oxidizes surfaces, and alters surface chemistry, influencing solid-gas interactions.
  • Ti64 laser treatment created superhydrophobic surfaces (rose petal regime) that did not enhance gas nucleation; other states promoted nucleation.

Conclusions:

  • Surface topography and chemical modification intricately control wetting states and solid-gas interfacial phenomena.
  • AM substrates offer tunable properties for enhanced gas nucleation, with laser patterning providing further control.
  • The interplay between roughness, chemistry, and wetting state is key for optimizing interfacial behavior.