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Multifunctional Hierarchical Surface Structures by Femtosecond Laser Processing.

Clemens Kunz1, Frank A Müller2, Stephan Gräf3

  • 1Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, Löbdergraben 32, 07743 Jena, Germany. clemens.kunz@uni-jena.de.

Materials (Basel, Switzerland)
|May 15, 2018
PubMed
Summary
This summary is machine-generated.

Researchers created hierarchical surface structures on fused silica using a femtosecond laser, enabling tunable superhydrophilic to superhydrophobic properties for advanced optical and microfluidic applications.

Keywords:
fs-laserfused silicahierarchical surface structuresnegative replica castingoptical propertiespolystyrenesilanizationwettability

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Nanotechnology

Background:

  • Hierarchical surface structures offer unique properties for advanced materials.
  • Controlling surface wettability is crucial for various technological applications.
  • Fused silica is a versatile material for optical and microfluidic devices.

Purpose of the Study:

  • To fabricate hierarchical surface structures on fused silica using a femtosecond laser.
  • To investigate the optical properties and wettability of the fabricated structures.
  • To demonstrate the transferability of these structures to other materials.

Main Methods:

  • Femtosecond laser fabrication with specific pulse duration (300 fs) and wavelength (512 nm).
  • Characterization using scanning electron microscopy, atomic force microscopy, and white light interference microscopy.
  • Optical transmittance measurements and water contact angle measurements for wettability evaluation.

Main Results:

  • Successfully fabricated hierarchical surface structures on fused silica.
  • Achieved tunable wettability, switching from superhydrophilic (θ = 0°) to superhydrophobic (θ > 150°) via silanization.
  • Demonstrated successful replica casting of structures onto polystyrene, maintaining transparency.
  • Observed only a slight decrease in transmittance compared to unstructured surfaces.

Conclusions:

  • Hierarchically structured fused silica surfaces exhibit tunable wettability and high transparency.
  • These structured surfaces serve as effective masters for replica molding, enabling structure transfer.
  • The developed method facilitates the fabrication of transparent glass with tailored wettability for optics, microfluidics, and biomaterials.