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Modification of wetting properties of laser-textured surfaces by depositing triboelectrically charged Teflon particles

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Abstract

Hydrophilic laser-textured silicon wafers with natural oxide surfaces were rendered hydrophobic by depositing electrostatically charged submicrometer Teflon particles, a process termed as triboelectric Teflon adhesion. Silicon surfaces were micro-textured (∼5 μm) by laser ablation using a nanosecond pulsed UV laser. By varying laser fluence, micro-texture morphology of the wafers could be reproduced and well controlled. Wetting properties of the triboelectrically charged Teflon-deposited surfaces were studied by measuring apparent static water contact angles and water contact angle hysteresis as a function of substrate roughness and the amount of Teflon deposited. A similar study was also performed on various micro-textured silicon carbide surfaces (sandpapers). If the average substrate roughness is between 15 and 60 μm, superhydrophobic surfaces can be easily formed by Teflon deposition with water contact angle hysteresis less than 8°. This environmentally benign solvent-free process is a highly efficient, rapid, and inexpensive way to render contact-charged rough surfaces hydrophobic or superhydrophobic.

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Authors and Affiliations

  1. Center for Biomolecular Nanotechnologies@UNILE, Istituto Italiano di Tecnologia (IIT), Via Barsanti 1, 73010, Arnesano, Lecce, Italy

    Ilker S. Bayer & Athanassia Athanassiou

  2. Department of Mechanical and Aerospace Engineering, University of Virginia, 122 Engineer’s Way, Charlottesville, VA, 22904, USA

    Ilker S. Bayer

  3. Italian Institute of Technology (IIT), via Morego 30, 16152, Genoa, Italy

    Fernando Brandi, Roberto Cingolani & Athanassia Athanassiou

Authors
  1. Ilker S. Bayer
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  2. Fernando Brandi
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  3. Roberto Cingolani
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  4. Athanassia Athanassiou
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Corresponding authors

Correspondence to Ilker S. Bayer or Athanassia Athanassiou.

Additional information

This article is part of the Topical Collection on Contact Angle Hysteresis

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Bayer, I.S., Brandi, F., Cingolani, R. et al. Modification of wetting properties of laser-textured surfaces by depositing triboelectrically charged Teflon particles. Colloid Polym Sci 291, 367–373 (2013). https://doi.org/10.1007/s00396-012-2757-0

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  • DOI: https://doi.org/10.1007/s00396-012-2757-0

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