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Updated: Nov 23, 2025

Scalable Stamp Printing and Fabrication of Hemiwicking Surfaces
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Wettability control of polymeric microstructures replicated from laser-patterned stamps.

Yangxi Fu1, Marcos Soldera2,3, Wei Wang1

  • 1Institut Für Fertigungstechnik, Technische Universität Dresden, George-Bähr-Str. 3c, 01069, Dresden, Germany.

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|December 31, 2020
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Summary

Researchers created microstructures on plastic surfaces to control water interaction. These patterned surfaces became hydrophobic, repelling water but also causing droplets to stick, a phenomenon explained by wetting models.

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Area of Science:

  • Materials Science
  • Surface Science
  • Polymer Science

Background:

  • Controlling surface wettability is crucial for various applications.
  • Polymeric materials like PET and PMMA offer versatile properties but require surface modification for specific functionalities.
  • Micro- and nanostructuring are effective methods for tailoring surface properties without altering bulk chemistry.

Purpose of the Study:

  • To fabricate periodic micropillar arrays on polyethylene terephthalate (PET) and poly(methyl methacrylate) (PMMA) surfaces.
  • To investigate the effect of these microstructures on surface wettability, including contact angle and hysteresis.
  • To compare experimental wetting data with theoretical predictions from Wenzel and Cassie-Baxter models.

Main Methods:

  • Two-step fabrication: Direct Laser Interference Patterning (DLIP) to create chromium stamps, followed by hot embossing to pattern PET and PMMA.
  • DLIP parameters were varied to control microstructure dimensions (period, height) and shape.
  • Wettability characterized by static, advancing, and receding contact angles (CAs) and contact angle hysteresis.

Main Results:

  • Fabricated micropillar arrays with periods from 1.6 to 4.6 µm on PET and PMMA.
  • Achieved hydrophobic surfaces with static CAs up to 140° on PET, without chemical modification.
  • Observed high adhesion of water droplets, preventing roll-off, indicating a specific wetting state.

Conclusions:

  • Periodic micropillar arrays effectively induce hydrophobicity on PET and PMMA surfaces.
  • The observed water droplet adhesion suggests a deviation from simple hydrophobic behavior, requiring advanced wetting models.
  • The study provides insights into structure-wettability relationships for polymer surfaces, validated by theoretical models.