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Microstructured Magnetoactive Elastomers for Switchable Wettability.

Raphael Kriegl1, Gaia Kravanja2, Luka Hribar2

  • 1East Bavarian Centre for Intelligent Materials (EBACIM), Ostbayerische Technische Hochschule (OTH) Regensburg, Seybothstr. 2, 93053 Regensburg, Germany.

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Summary
This summary is machine-generated.

This study shows how magnetic fields can control the wettability of magnetoactive elastomers (MAEs). Softest MAE coatings exhibited the largest change in contact angle, enabling potential applications in smart microfluidic devices.

Keywords:
contact anglelaser micromachiningmagnetoactive elastomeroptical profilometrysurface microstructuringwetting

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Area of Science:

  • Materials Science
  • Surface Science
  • Soft Matter Physics

Background:

  • Magnetoactive elastomers (MAEs) are composite materials with tunable properties influenced by magnetic fields.
  • Controlling surface wettability is crucial for various applications, including microfluidics and self-cleaning surfaces.

Purpose of the Study:

  • To demonstrate magnetic field control over the wettability of non-structured and microstructured MAEs.
  • To present a novel fabrication method for MAE coatings with enhanced magnetic field responsiveness.
  • To investigate the influence of laser micromachining parameters on the wetting behavior of microstructured MAEs.

Main Methods:

  • Synthesis of MAEs with 75 wt.% carbonyl iron particles and varying elastomer matrix stiffness.
  • Fabrication of MAE coatings on plastic substrates using a new method.
  • Laser micromachining to create microstructured MAE surfaces (lamellar and pillared).
  • Contact angle measurements under varying magnetic field strengths (up to 400 mT).

Main Results:

  • The softest MAE sample showed the highest contact angle variation, from (113 ± 1)° to (156 ± 2)° at 400 mT.
  • Microstructured MAEs (lamellar and pillared) exhibited complex wetting behaviors influenced by laser processing parameters.
  • Strong anisotropy in wetting behavior was observed for lamellar MAE structures.

Conclusions:

  • Magnetic fields effectively control the wettability of both non-structured and microstructured MAEs.
  • The developed fabrication method enhances the magnetic responsiveness of MAE surfaces.
  • These findings pave the way for developing magnetically controlled smart surfaces for droplet-based microfluidics.