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Wetting on nanorough surfaces.

S M M Ramos1, E Charlaix, A Benyagoub

  • 1Département de Physique des Matériaux (UMR CNRS 5586), Université Lyon I, 69622 Villeurbanne Cedex, France. ramos@dpm.univ-lyon1.fr

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2003
PubMed
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We studied how nanostructured surfaces affect water wetting and contact angle hysteresis. Surface defects initially increase hysteresis, but higher defect densities lead to collective pinning and decreased hysteresis.

Area of Science:

  • Surface science
  • Materials science
  • Nanotechnology

Background:

  • Understanding surface wetting is crucial for various applications.
  • Contact angle hysteresis is a key parameter in surface wettability.
  • Nanostructured surfaces offer tunable properties for controlling wetting behavior.

Purpose of the Study:

  • To investigate the wetting properties of random nanostructured surfaces.
  • To analyze the phenomenon of contact angle hysteresis on these surfaces.
  • To correlate defect density with wetting behavior and hysteresis.

Main Methods:

  • Fabrication of nanostructured surfaces using swift heavy ion irradiation.
  • Characterization of surface defects and their areal density (phi(d)).

Related Experiment Videos

  • Measurement of water contact angle hysteresis and average spreading parameter.

    • Main Results:

    • Contact angle hysteresis initially increases linearly with defect density (phi(d)).
    • At higher phi(d), collective pinning effects emerge, causing hysteresis to decrease.
    • Experimental results in the linear regime agree with theoretical predictions for single defect pinning.

    Conclusions:

    • Surface nanostructuring via ion irradiation effectively modifies wetting properties.
    • Defect density plays a critical role in controlling contact angle hysteresis.
    • The study provides insights into defect-induced pinning mechanisms on heterogeneous surfaces.