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Wetting properties of LIPSS structured silicon surfaces

Author

Listed:
  • Olga Varlamova

    (Experimental Physics and Functional Materials, Brandenburg University of Technology Cottbus-Senftenberg)

  • Juergen Reif

    (Experimental Physics and Functional Materials, Brandenburg University of Technology Cottbus-Senftenberg)

  • Michael Stolz

    (Fraunhofer Institute for Photonic Microsystems, Branch Integrated Silicon Systems)

  • Rodica Borcia

    (Statistical Physics and Nonlinear Dynamics, Brandenburg University of Technology Cottbus-Senftenberg)

  • Ion Dan Borcia

    (Computational Physics, Brandenburg University of Technology Cottbus-Senftenberg)

  • Michael Bestehorn

    (Statistical Physics and Nonlinear Dynamics, Brandenburg University of Technology Cottbus-Senftenberg)

Abstract

The controlled dynamics of liquid drops via generation of specific wetting states on a solid surface is of great interests both in the fundamental and applied sciences. Considering that the wettability is strongly dependent on the surface topography and surface roughness, we investigate – through experiments and theory – the effect of laser-induced periodic surface structures (LIPSS) generated on silicon (100) targets as a control parameter of wetting properties. To obtain structured silicon surfaces with different morphological features, we patterned the surface by irradiation with femtosecond pulses from an amplified Ti:Sapphire laser system (790 nm/100 fs/1 kHz) at a fluence in the range of 0.4–1.2 J/cm2 on a spot with a diameter about of 100 μm. Variation of the applied irradiation dose results in surface modifications with the roughness about of a few tens of nanometers are ranging from regular LIPSS patterns with the lateral period of about 500–700 nm to complex agglomerations of 3-D microstructures with several-μm feature size. The theoretical study on the correlation of wetting properties with the surface topography has been performed within a phase field model. We found an excellent agreement of numerical results with experiments. Graphical abstract

Suggested Citation

  • Olga Varlamova & Juergen Reif & Michael Stolz & Rodica Borcia & Ion Dan Borcia & Michael Bestehorn, 2019. "Wetting properties of LIPSS structured silicon surfaces," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 92(5), pages 1-8, May.
    • Handle: RePEc:spr:eurphb:v:92:y:2019:i:5:d:10.1140_epjb_e2019-90672-2
    DOI: 10.1140/epjb/e2019-90672-2
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